Kenwood TH-D74A, TH-D74E User Manual

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Copyrights for this Manual

JVCKENWOOD Corporation shall own all copyrights and intellectual properties for the

product and the manuals, help texts and relevant documents attached to the product or the optional software.

A user is re quired to obtain approval from JVCKENWOOD Corpor ation, in writing, prior to

redistributing this document on a person al web page or via packet communication.

A user is prohibited from assigning, renting, l easing or reselling the document.

JVCKENWOOD Corporation does not warra nt that quality and functions described in this

manual comply with each user’s purpose of use and, unl ess spe cif icall y des cribed in t his manual, JVCKENWOOD Corporation shall be f ree from any res ponsibility f or any defect s and indemnities for any damages or losses.

Software Copyrights

The title to and ownership of copyrights for soft ware, including but not limited to the

firmware and optional software that may be distri buted individually, are reserved for JVCKENWOOD Corporation. The firmware shall mean the software which can be embedded in KENWOOD product memories for pro per operation.

Any modifying, reverse engineering, copy ing, reproducing or disclosing on an Internet

website of the software is strictly prohibited.

A user is re quired to obtain approval from JVCKENWOOD Corporation, in writing, prior to

redistributing this manual on a personal web page or via packet communication.

Furthermore, any reselling, assigning or transferring of the software is also strictly

prohibited without embedding the softwa re i n KENWOOD product memories.

Copyrights for recorded Audio

The software embedded in this transceiver consi st s of a multiple number of and individual

software components. Title to and ownership of copyrights for each software component is reserved for JVCKENWOOD C orporation and the respective bona fide holder.

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Trademarks

KENWOOD is a registered trademark of JVCKENWOOD Corporation.

Windows

and the Windows® logo are the registered trademarks of Micr osoft Corporation

in the United States and other countries.

The microSD logo and microSDHC logo are t rademarks or register ed trademark s of SD-3C

LLC.

The Bluetooth

word mark and logo are registered tradema rk s owned by Bluetooth SIG,

Inc., and JVCKENWOOD Co., Ltd. uses these marks under li cense.

APRS

(The A utomatic Packet Reporting System) is a registered American trademark of

WB4APR (Mr. Bob Bruninga).

SmartBeaconing

EchoLink

is a registered trademark acquired by Synergenics, LLC in the USA.

Raspberry Pi

is provided by HamHUD Nichetronix.

and the Raspberry Pi logo are trademarks or registered trademarks of the

UK Raspberry Pi Foundation in the UK and other countries.

All other product names referenced herein are trademarks or regist ered tradema rks of their

respective manufacturers. Marks such as is

and ® are omitted in the body text.

Indemnity

JVCKENWOOD Corporation takes all appropriate measures to ensure all descriptions in

this manual to be accurate; however, this manual may still contain typos and expressi ons that are misleading. JVCKENWOOD Corporation is entirely free from any responsibilities arising from any losses or damages caused by such typos or expressions.

JVCKENWOOD Corporation has the right to change or improve the product specifications,

etc., described in this manual without prior notice. JVCKENWOOD Corporation is entirely free from any responsibilities for any losses or damages caused by such changes and improvements.

JVCKENWOOD Corporation is entirely free from any responsibilities for any failures,

damages or losses arising from, or in conne ct i on with, use of the transceiver with or connected to any external equipment. Failures, damages or losses shall include the failures, damages or losses that may occur at the PC connected to the transceiver or in storage devices having memory area such as a USB flash drive. JVCKENWOOD Corporation is entirely free from any responsibilit ies for any secon dary fai lures, damag es or losses, including but not limited to the loss or damage of data or data files stored in these memories.

JVCKENWOOD Corporation does not warrant that quality and functions described in this

manual comply with your purpose of use and, unless specifically described in this manual, JVCKENWOOD Corporation shall be free from any responsibilities for any

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defects and indemnities for any damages or lo sses. Selection and installation of any external equipment shall be done at your own risk. You are fully responsi ble for t he use and effects of external equipment.

JVCKENWOOD Corporation shall be free from any responsibilities for any incidental

losses or damages, such as missing communicati ons or call opportunities caused by a failure or performance error of the transcei ver.

Well aware in your mind, we cannot answer to any and all technical information associated

with method of connection to, configurati on for and operation of an external device and PC beyond our knowledge.

Handling of important data there is a possibility that customer's important data may be lost

due to malfunction of the equipment, occur rence of unforeseen circumstances or erroneous operation or malfunction of the equipm ent. As important information such as operation information, recorded voice, m essage, setting data and logs, you should create backup data at any time and save it as an ex ternal data storage device such as USB memory.

Treatment of your important data

There is always a risk of losing your important data by a transceiver failure, occurrence of an unforeseen contingency, erroneous operat ion or fault y behavi or of the t ransceiver. The data, such as the operating information, recorded audio, messages, configuration data, and logs, must be backed up as necessary by yourself and stored in an external storage device such as a USB flash drive.

URL and contacts of JVCKENWOOD CORP ORATION.

The latest URL and contacts of JVCKENWOOD Corporation at the ti m e when this manual was written are described in this manual. Due to changes of social circumstances or the management environment, the URL and contacts of JVCKENWOOD Corporation may change from time to time.

In creating and writing this commentary, the following people gave us cooperation.

WB4APR Mr. Bob B runinga W6GPS Mr. Don Arnold

I would also like to thank the amateur radio ope rat ors who are responsible for maintaining and preserving the APRS and D-STAR systems operating around the world.

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COPYRIGHTS FOR THIS MANUAL ............................................................................................ 2

SOFTWARE COPYRIGHTS ......................................................................................................... 2

COPYRIGHTS FOR RECORDED AUDIO .................................................................................... 2

TRADEMARKS ............................................................................................................................. 3

INDEMNITY ................................................................................................................................... 3

TREATMENT OF YOUR IMPORT ANT DATA .............................................................................. 4

URL AND CONT ACTS OF JVCKENWOOD CORPORATION. ................................................... 4

1 GETTING STARTED ............................................................................................................. 7

1.1 FOR PUBLICATION OF THIS DOCUMENT ..................................................................................... 7

2 ENJOYING APRS (BY BOB BRUNINGA, WB4APR) ....................................................... 8

2.1 APRS OVERVIEW ................................................................................................................... 8

2.2 PACKET RADIO HISTORY ......................................................................................................... 8

2.3 PACKET NETWORK GROWTH ................................................................................................... 9

2.4 APRS IN 1990S ................................................................................................................... 10

2.5 APRS-IS RES THE INFORMA TION WORLDWIDE........................................................................ 10

2.6 APRS HANDHELD AND MOBILE RADIOS ................................................................................. 11

2.7 TEXTING .............................................................................................................................. 12

2.8 FACEBOOK ON APRS ........................................................................................................... 13

2.9 APRS VOICE ALERT ............................................................................................................. 13

2.10 FREQUENCY DATA FIELD AND AUTO-TUNE (OR QSY) ........................................................ 14

2.11 VOICE REPEATERS AND CLUB INFO...................................................................................... 15

2.12 HAMFEST TALK-IN AND OBJECTS ......................................................................................... 16

2.13 VOICE OVER INTERNET PROTOCOL (VO-IP) AND D-STAR ..................................................... 17

2.14 DIGIPEATER PATH INFORMATION .......................................................................................... 18

2.15 OTHER APRS INFORMATION RESOURCES ........................................................................... 18

2.16 CONTRIBUTION BY KENWOOD TO APRS ........................................................................... 19

2.17 LIST OF ICONS THAT CAN BE SET / DISPLAYED ON THE TH-D74A/E ........................................ 21

3 APRS ................................................................................................................................... 22

3.1 APRS FEATURE ON THE TH-D74A/E .................................................................................... 22

3.2 WHAT IS A KISS MODEM? ..................................................................................................... 24

3.3 KISS MODE ......................................................................................................................... 26

4 ENJOYING D-STAR (BY DON ARNOLD, W6GPS) ........................................................... 28

4.1 ENCOUNTER WITH D-STAR .................................................................................................. 28

4.2 ENJOY WITH D-STAR ........................................................................................................... 29

4.3 D-STAR REFLECTOR OPERATION ......................................................................................... 30

4.4 ABOUT THE TH-D74A/E ....................................................................................................... 32

5 D-STAR ................................................................................................................................ 33

5.1 BASIC OPERATION ................................................................................................................ 33

5.2 COMMUNICATION USING D-STAR ......................................................................................... 33

5.3 COMMUNICATING USING A REPEATER .................................................................................... 35

5.4 CONFIGURATION FOR REFLECTOR NODE ............................................................................... 38

5.5 HOW TO UPDATE THE REPEATER LIST .................................................................................... 41

6 SETTINGS & CONTROLS .................................................................................................. 45

6.1 EXTENDING THE BATTERY LIFE .............................................................................................. 45

6.2 SILENT APRS AND PACKET COMMUNICATIONS (VOICE ALERT) ............................................... 46

6.3 SCREEN CAPTURE OF RADIO DISPLAY ................................................................................... 46

6.4 VIEWING MICROSD CARD ON PC .......................................................................................... 47

6.5 ADJUSTMENT OF RX AUDIO QUALITY ..................................................................................... 47

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ADJUSTMENT OF TX AUDIO QUALITY ..................................................................................... 48

6.6

6.7 WIDE-BAND AND MULTI-MODE RECEPTION ............................................................................. 48

6.8 MODE .................................................................................................................................. 51

6.9 MEMORY CHANNELS ............................................................................................................. 53

6.10 BLUETOOTH ....................................................................................................................... 55

6.11 USB USAGE ....................................................................................................................... 56

6.12 MICROSD CARD USAGE ..................................................................................................... 57

7 APPENDIX ........................................................................................................................... 62

7.1 EXTERIOR VIEWS .................................................................................................................. 62

7.2 TH-D74A/E SPECIFICATIONS................................................................................................ 63

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1 Getting Started

1.1 For publication of this document

This manual has been developed with the user of the TH-D74A/E in mind. Its intent is to enable the user to enjoy the features of their radio in both APRS and D-STAR. In addition to the information shared on the TH-D7 4A/E, descriptions are provided on the MCP-D74 software.

Like the previous and existing handheld model s, the TH-D7A/E and TH-D72A/E equipped with the A P RS feature set, these models and their predece ss ors were developed for data communications along with voice. With the TH-D74A/E series, these features have been greatly enhanced and expanded to make operation easier for both new and experienced APRS users. Not only the enjoyment received by the use of APRS, D-STAR has been added to offer true digital communications. D-STA R was developed by the Japan Amateur Radio League (JARL) as a digital protocol for am ateur radio.

We have placed great ef forts in the development of high-performance and high-functionality equipment that offer power and performance. The TH-D74A/E is equipped with a high visibility, color transreflective liquid crystal di splay (TFT), the first in the industry in a handheld amateur radio (as of November 2017). Building on the popularity of the wideband frequency receive feature of the TH-F6A/F7E, the TH-D74A/E supports DSP processing for CW / SSB reception with the added addition of IF bandwidth filtering.

Features such as APRS and D-STAR require positio nal i nformation from the transceiver the TH-D74A/E has a highly-sensitive internal GPS re ceiver. As with the previous and existing models, GPS Log Mode is available to track movement.

The TH-D74A/E supports the USB interface, Bl uetooth, and a microSD card slot for easier programming, data transfers, and genera l communications b etween periphe ral devices such as your computer or tablet.

These features of the TH-D74A/E enhance the user experience and will be explained more in the following pages. Please read through this document along with your User Manual to better understand how to best enjoy your radio.

http://manual.kenwood.com/en_contents/search/keyword.

TH-D74A/E Development Team, December 2017

ote) This manual (PDF version) is the addition of drawings and images to the contents of

the booklet distributed at "DAYT ON HAMVENTION 2017"

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

2.1 APRS Overview

The TH-D74A/E APRS / D-STAR h andheld transceiver is the latest in the long series of KENWOOD APRS radios and it brings the whole new dimension of digital voice (D-STAR) that not only allows the internal global data and m essaging by callsign (APRS) but now global Voice by callsign through D-STAR networks. It is hard to fully grasp what this power can bring to Amateur Radio operation once these radi os are in the hands of the motivated operator and experimenter . The radio continues the evolution of the fundamental principles of APRS as a common information resource channel for facilitating human-to-human communication and now voice. To see how this fits in, it is first necessary to un derstand the history of APRS and packet radio.

2.2 Packet Radio History

The roots of the Automatic Packet Reporting System (A PRS) go back to the late 1970s as the AMRAD (Amateur Radio Research and development) Group was excitedly beginning to experiment with AX.25 packet radio. This was before the Internet, and as we spent our free time in our shacks, we were in fact all socially-networked by the AMRAD voice repeater. On evenings and weekends, someone was worki ng on something or developing something new and sharing the excitement with the others on the repeater channel. We hung onto our handheld transceivers everywhere we went like kids these days hang onto their iPads and smartphones to keep up with the excitement .

story of APRS from VIC-20 to TH-D74A/E

The Hi

nce only RTTY was legal in the USA at t he time, we developed a RTTY chat channel to

Si augment our repeater communications. We wanted a digital channel that worked just like a voice repeater. That is, anyone who had info transmitted it, and everyone monitoring captured it. Advancing from RTTY, AMRAD developed the AX.25 spec and as soon as it was legal, we were on the air as a chat group using real-t i m e Unconnected Information (UI) packet messaging. One field activity of this technical group was the annual

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

communications support for the Old Dominion 100 mile endurance run. For this event in the mid1980s, the first vestige of APRS used Vic-20s and packet radio to share information on the hundreds of runners and horses across the hu ndreds or so square miles over the 24-hour event.

There was no such thing as GPS. The system consisted of simply a packet channel where each checkpoint beaconed information and obj ects about arrivals and then transferred object responsibility as it was taken over by the next checkpoint. At any instant, everyone could see on their screens, a list of the objects reported at each station and their status. New information was beaconed at a high rate for immediate delivery but decayed rapidly to reduce channel loading so that fresh information had priority with minimum collisions. This was the core concept that became APRS.

2.3 Packet Network Growth

Beginning in 1983, we added VHF, HF and a phone line to the club packet BBS to provide a store and forward capability and began expanding to the Commodore 64. It was linked with other systems on 145.01 MHz and had the first dual-port HF link onto the 10.149 MHz HF packet frequency we still use today for APRS. It was an exciting time, but packet radio was being used more and more for connected point-to-point traf f ic and then to B BS system s and the real-time connectivity between operators was bei ng lost. By that time, live beacons to announce real-time activity and to conduct group chats by UI messaging was not only disappearing but were actually being outlawed on the congested/shared BBS channels. Even UI digipeating was being disabled in all packet nodes to make sure that no one beaconed or chatted on the BBS network and dozens of restricted/exclusive use packet frequencies. Everything was evolving to store-forward mess agi ng (like internet email became over the next decade) and real-time digit al human connectivity was lost.

But we still wanted that live operator-to-operator UI packet chat capability and we still needed a tactical real-time local communications and information distribution channel for rapidly exchanging digital data of immediate value to local operators and operations. In 1992, we abandoned the Commodore 64 and switche d to the new IBM AT personal computer running at 4 MHz and changed the name from the Connectionless Emergency Traffic System (CETS) to Automatic Packet Reporting System (APRS) since it matched my callsign so nicely.

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

2.4 APRS in 1990s

I formally presented APRS at the TAPR/ A RRL Digital Conference in 1992. APRS really took off as the cost of GPS got bel ow $500 each and I manually digitized maps of the ent i re U.S.A. and some other countries using coordin ates measured from paper maps. It was during these times that the “P” in APRS was temporarily called “Position” to highlight this new capability. Unfortunately, this was a mistake.

Over the next decade as GPS became readily available, too many hams only saw the position maps of APRS and not the broad communication applications for human-to-human tactical ham radio information exchange in real time.

Too many operato rs bought transmit-only GPS trackers and further i gnored the real-time human communications element. Many follow-on software clients focused on maps with little attention to the underlying network proto col and live human-to-human connectivity both local and global.

but the APRS-IS collects information from local IGates and shares the information worldwide.

The APRS network is primarily designed for local real-time operations,

2.5 APRS-IS res the information worldwide

In 1997, K4HG Steve Dimse and the Mac/WinAPRS Sproul brothers tied APRS to the Internet and the APRS-IS system as shown above was born. Over the years the network has grown including several Amateur Satellites since 2001 and in 2015 even an APRS channel with global downlink coverage via the Inmarsats called Outernet. See http://aprs.org/outnet.html

While this was a huge success that enabled instantaneous global APRS texting connectivity worldwide, it also further enhanced the map vi ew experience of casual APRS viewers. Looking at an APRS map was colorful but it still did not obviously convey the real-time human contact and connectivity inherent i n the system. Also, it was impossible to communicate with all of the one-way trackers equipment which had no receivers. The value of two-way amateur radio communications was further being lost in favor of simple one-dimensional icons on maps. These simple icons omitted the other 8 dimensions of color attributes associated with each APRS symbol that gave additional at-a-glance real time information to viewers suc h as type, age, moving-or-static, object-or-station, ownership, and liver-operator or m essaging capability. See http://aprs.org/symbols.html

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

2.6 APRS Handheld and Mobile Radios

To counteract thi s t rend, we stopped using “Position” for the "P" in APRS and went back to the original “Packet” nomenclature for the "P" in APRS. Then in 1998, KENWOOD gave a landmark boost to A PRS in the field and to this two-way digit al communication s capability by introducing the fully integrated TH-D7A/E. This TH-D7A/E put APRS in the palm of the hand of ham radio operators worldwide. Not only did it take GPS inputs, but it fully implemented the APRS messaging, bulletins and texting capabilities at both 1200 and 9600 baud.

Over the next 11 years, this first KENWOOD APRS radio was the most popular KENWOOD HT ever as APRS brought new life to packet radio. In parallel, KENWOOD also introduced the fully integrated TM-D700A/E mobile APRS radio in 2000. These APRS front-panel-display radios now brought the full APRS local situational awareness to the mobile operator as shown below. With these displays, the APRS information content delivery system was in place without any need for mobile PC’s or laptops. Further, the attached GPS provided the map display and the radio display provided all the other information content .

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

2.7 Texting

But still, most non APRS ham radio operators just did not see any advantages beyond the maps. My frustration with the growing lack of live human content in APRS continued to fester to the breaking point at a 2006 ARRL Special Meeting at Dayton on the lack of yout h in ham radio. The gathered fathers of ARRL lamented: “Ham radio was missing the youth”. They were “too busy texting on their cell phones” and “ham radio had nothing similar to offer”. I was flabbergasted. Ham radio had had a wireless texti ng/email handheld device for nearly a decade since 1998 in the form of the handheld KENWOOD APRS TH-D7 A/E and yet even the amateur radio leadership was not aware of t hese capabilities and had never tried it.

This was frustrating. While the older hams were shunning real-time APRS digital text communications with APRS, and handheld Photo-sharing u sing the KENWOOD SSTV handheld, the kids of the world were just getting going with texting and Photo-sharing then Twitter on every conceivable handheld device or exchanging handheld pictures with the VC-H1. Yet the entrenched amateur radio ol d timers could not see any value to APRS texting and emailing on a keypad.

As mentioned in the above illustration, there a re m ore than 26 different text syst em s being used in Amateur Radio (which do not talk to each other) as sugges ted in the image above. Fortunately, today just about every smartphone and handheld does have an application for APRS message compatibility . Our goal i n APRS is to seamles sly i nt egrate t h ese disjoi nt ed systems so that a message-to-callsign from any devic e gets delivered to the callsign owner on any device that is currently turned on. Many of these systems are already connected by APRS and the APRS-Internet system (APRS-IS). Refer to http://aprs.org/aprs-messaging.html

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

2.8 Facebook on APRS

Purely as an aside, you can think back to the KENWOOD VC-H1 handheld SSTV device as an attempt (before its t i m e) to add the visual aspect of social networking to ham radio and APRS. This was a fantastic idea. And it was fully integrate d i nto all KENWOOD APRS radios at the time, adding real-time video to APRS digital and texting connectivity. You could think of the combination as real-time “Facebook” on APRS.

Unfortunately it was ahead of its time and the VC-H1 handheld is no longer in production, but thousands of hams have them and still use them. These SSTV handhelds along with readily available free SSTV software make a great visual adjunct to APRS which could pass through any voice channel or repeater. This was in the early 2000 time frame bef ore a ny one had c ame ra phones. Think of the potential.

The concept was to snap an image, and send it into APRS where it was picked up by a web site that cataloged it by position, originator and a text description for viewing by anyone. This can be a tremendous asset for ham radio public service. There are a few such active links from APRS and SSTV t o the web called the Automat ic Picture Relay Network, or AP RN.

Although most hams do not have the KENWOO D VC-H1, there has been a revolution in smart phones and now anyone anywhere can use t heir smart phone to send and receive SSTV images simply via the camera in the phone and an SSTV application software that can then convert the image to tones and transmit it over any of the KENWOOD handheld or mobile radios. Similarly, any such phone with the SSTV application can use t he phone to decode the audio and display the SSTV image. Thus, anyone with a smart phone and a 2-way radio and a radio voice channel can still send images by amateur radio! Refer to: http://aprs.org/aprn.html

2.9 APRS Voice Alert

Three things dramatically brought back human connectivity to APRS. The first factor was Voice Alert. The second was the addition of a frequency field in all APRS position packets. And the third was the emergence of VOIP Internet/ham radio linked voice.

Voice ale rt is like a 3rd sim ultaneous ra dio chann el on the KENWOOD APRS transceivers. It acts like an intercom channel for all APRS operators to be able to quickly raise another nearby APRS voice alert stat ion by a simple di rect voi ce call. I t required no ne w hardwa re or software. It simply consists of setting CTCSS 100 Hz on the APRS data channel and keeping the speaker volume up. This way, all packet noise was completely muted, but the operator could still be called at any time with a CTCSS 100 Hz voice call. A secondary benefit to this technique was a free proximi ty detector. If any other Voice Alert station got within simplex range (maybe 5 miles or less in a mobile) his periodic packets would give an audible alert. These new features of APRS Voice Alert as indicated in the APRS Mobile information Exchange drawing above finally m ade i t easy to keep the eyes on the road, but never miss the opportunity for human contact wit h a fell ow AP RS operato r on the open road. Voice Alert i s easiest enabled and disabled by simply storing two separate Mem ory channels on the national APRS frequency. One with CTCSS 100 and the other without.

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

One is the TUNE function shown on the screen above.

As in the third image, when TUNE is selected, the radio automatically tunes t o the frequency of the second band (non-data band).

2.10 Frequency Data Field and AUTO-TUNE (or QSY)

At the nearly same time as we introduced Voice Alert (2004), the Frequency fiel d was added to the A P RS posit i on packet specification. This standardized the inclusion of a voice operating frequency in the APRS system. APRS was never intended as an end-in-itself, but as a tool to be applied to all aspects of ham radio and human contact. Knowing other station’s voice contact frequency in many cases is even more important for establishing communications than knowing position. Now every ham could announce his monitoring frequency in his APRS packet and could call others on their indicated frequency. KENWOOD was the first to leverage the value of this capability by introducing i t in all of their APRS radios since 2007 (the TM-D710A/E, TH-D72A/E TM-D710GA/E and TH-D74A/E). These radios not only automatically include your v oice band frequency in every position packet but can also then tune to someone else’s, frequency by simply selecting the “Tune” menu as shown below:

In the image above, stations with frequencies em bedded in position information packets are displayed on the screen. This station is the eleventh station in the list, transmits a beacon of the operation frequency of its own station, and transmits a short message informing other stations that they are also listening to voi ce alerts within the simplex communication range. In this screen, use the [MENU] key to recall multiple additional functions.

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

2.11 Voice Repeaters and Club Info

Besides alerting others to the voice monit oring frequency of other APRS operators, the addition of the Frequency field to APRS opened up a whole ne w application of local information for the mobile operator. Now everywhere the APRS operator travels, he can be alerted to the recommended traveler’s voice repeater in any area he was passing through. This is accomplished by not only having every digip ea ter bea con i ts position and avai labilit y, but also by beaconing this local frequency object. These frequency objects show up in the station li st of all mobile ope rators in range as s hown below in the TM-D710A/E, TM-D710GA/E and TH-D74A/E front panels:

n the TM-D710GA/E station list as above, not only are the two stations of AB9FX nearby, but also his current VOICE operating frequency i s visible. Also, we can see that this radio is in OPERATING range of three voice repeaters that are also identifying themselves as objects on APRS as the locally recommended voice operating channels.

The TH-D74A/E on the right has two ham calls, two t act i cal calls and one repeater object. It is easy to find these nearby frequencies in the huge station list by first doing a SORT. This brings all the numeric objects (in this ca se, frequencies) to the top of the list as shown on the TM-D710GA/E on the left.

The standard for these frequency objects also includes Tone, Shift, and bandwidth for instant tuning. In addition, they can include t he we ekly on-air v oice net times as well as th e monthly club meeting dates as shown below, all in a single periodic beacon object:

lthough the information appears a bit cr yptic, the fact that all voice repeater obj ects use this

A same standard format makes it easy for the operator to understand the meaning. In this case, the local recommended voice repeater in this area is the 147.105 MHz (Maryland) repeater with a Tone of 107.2 Hz.

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

The repeater's range is 25 miles and the weekly net time is Tuesday evenings at 8 p.m. The final 8 characters (limited for backwards compatibili ty to TM-D700A/E) announce that the club meetings are on the 3rd Thursday of every month.

Again, a press of the [MENU] key and then selecting “Tune” will instantly take the radio to this channel. For full details on this function, ref er to the following website: http://aprs.org/localinfo.html

2.12 Hamfest Talk-in and Objects

APRS should be a primary tool of any Hamfest talk-in station. Alongside the voice operator should be an APRS operator managing the local APRS tactical map with the locations of all the special objects associated with the Hamfest. In addition this A PRS ope r ator help s the voice operat or see where t he mobil e chec k-ins that are lost are located so he can give them voice guidance to the Hamfest.

The most important APRS object is the one that shows the location of the HAMFEST and the talk-in frequency. This bright red APRS symbol stands out smartly on any APRS display including the AvMap GPS display as sho wn above. At first glance, this object tells you the most important information: Where it i s, and when.

The HFEST-DDn standardi zed object name includes the DATE in the DD digits. Only the day is shown (here it is on the 26th), but this allows for 2 weeks notice to everyone in the area and anyone driving through.

The final character “n” is chosen to make the symbol unique in the global APRS system so it is not overwritten by other Hamfests on the same d ay somewhere else.

This makes for easy sorting of these objects. Sim pl y go to http://aprs.fi/hfest * and see a list of all active Hamfest the world over!.

The talk-in frequency is also listed for instant QSY with the TH-D74A/E “Tune” function. I was on a cross-country trip one day on a weekend and j ust happened to see one of these objects and was able to detour and spend an hour or two at this favorite ham radio pastime.

To see how to beacon your local Hamfest, refer to the following website: http://aprs.org/hamfest.html

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

2.13 Voice over Internet Protocol (Vo-IP) and D-STAR

Recognizing the huge potential for linking local ham radio over Internet, an added goal of APRS since 2001 has been to facilitate the integration of Digi tal Voice Systems and allowing end-to-end voice contact while using APRS global messaging cap abi l i ty to help set up the calls. Initially, this was via the use of IRLP, EchoLink, and other VoIP systems. Now with the TH-D74A/E, this can include D-STAR.

Just like the Frequency Objects, all ham radio VoIP systems are encouraged to announce their presence on APRS. Within 10 minutes t he node number, frequency, tone and other info are available to all APRS operato rs on thei r radios as shown above . Again, a simple press of the “Tune” function will QSY the radio for instant operation.

The long-term goal of this VoIP and Frequency capability has been to enable APRS to be used for setting up end-to-end global contacts using only a known callsign. The idea was to simply enter a callsign in a contact-request message will cause the APRS Internet system to handshake with the VoIP systems to set up the call and send the necessary QSY messages and frequency information for the radio to instantly tune and complete the call.

Think of it as a cellular system for ham radio where you dial by callsign instead of phone number. Both TM-D710GA/E and TH-D74A/E were designed to be evolved with this capability.

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

There are 4 pages of information about each station received by the TH-D74A/E and imported into the station list, and displayed on the 4th page.

2.14 Digipeater Path Information

Another new information feature included i n the TH-D74A/E is the digipeater path displ ay shown here so the recipient can understand the local network and how a given packet was routed through the APRS digipeater network. This display shows the First and Last digipeaters used. Most APRS areas encourage the use of only 2 hops or less. This means, in most cases, the full path is visible. In this image the WB3V-6 packet was first heard by the N3KTX-1 digipeater and then it was delivered to my radio by the Last hop on the KV3B-2 digipeater. This path knowledge is very valuable to the operator in understanding his local area network.

the display of this digipeater / pass is

2.15 Other APRS Information Resources

The information available to the mobile operat or via AP RS i s nearly unlimited but not if no one is transmitting it. Ideally local info is only transmitted direct, with no path hop s from t he local digipeater and no more often than once ev ery 10 minutes to give a chance for a new mobile to get it. If the local info has to be digipeated once, then it is a longer range and the rate should drop to every 20. If it is sent regionally via 2 hops it should only be once every 30 minutes which is still possible for a 60 MPH traveler to be within range of 2 digipeaters and get the info. There is plenty of room for additional content when properly added to the local channel. This is not spam, but real immediate information of value to the mobile or traveler. There are many examples of data sources that have been implem ented in some local areas. For example,

-Traffic speeds at select choke points: refer to: http://aprs.org/traffic.html Mobile Satellites view: refer to: http://aprs.org/satinfo.html

-MF

I-InfoKiosk local info database: refer to: http://www.apritch.co.uk/addon_uiview32.htm

-U

-APR

S client for windows refer to: http://aprsisce.wikidot.com/clients

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

2.16 Contribution by KENWOOD to APRS

KENWOOD has developed its series of radios, TH-D7A/E, TM-D700A/E, TM-D710A/E, TH-D72A/E, TM-D710GA/E and now the new TH-D74A/E to best support the original objectives of APRS.

The real-time display of A P RS i nformation on the front panel of these radios gives t he mobile operator instantaneous access to all l ocal i nformation being provided on the APRS channel about all surrounding ham radio activ i ties.

There are many APRS clients and programs that have been written that sometimes have concentrated too much on the display of maps and vehicle positions while leaving out much of the original fundamentals of APRS and the efficiency of the APRS network.

The KENWOOD radios avoid such an over-simplistic approach to APRS by implementing a rich and diverse function set. The function set includes almost all of the original functions of APRS that are meant to reinforce the concept of distributin g l ocal information. The KENWOOD radios are not just Vehicle Tracking Systems, but are designed to be real-time information distribution systems for mobile operators with these features:

Position Entry

TH-D74A/E with its built in GPS solves the hassle of external connections and setup and always accurately knows your position. For times indoors the radio has 5 position memories for pre-stored frequently-used positions.

APRS Network Fundamentals

KENWOOD fully implemented the more subtle aspects of the APRS fundamentals that assure optimum network efficiency and channel sharing among all users. New TH-D74A/E supports the decay algorithm, proportional pathing and SmartBeaconing. These techniques provide good refresh rates for new and local information while minimizing the network impact of old and distant data.

Objects (NEW)

The KENWOOD transceivers fully appreciate the value of APRS objects and display them prominently. The object location is shown just li ke other stations either on the attached map display or on the front panel with distance an d range. Not only does the TH-D74A/E also include filters for easy sorting of these objects in the list, this radio is the first one to have the ADD OBJECT function so that users in the f ield can use only their handheld to place important objects on the map. These objects are what give APRS the local information value to local users.

Two-Way Messaging

Unlike passive one-way tracking devices, the KENWOOD radios provide the mobile user with full two-way messaging and display. This real-time human-to-human communications is what makes APRS so valuable in support of special events and emergencies.

Field Data Entry

In addition to making excellent field data display devices, the TH-D74A/E menus have also been designed for easy data, position and message entry. Often overlooked is the ability to use TH-D7A/E, TM-D700A/E, TM-D710A/E and TM-D710GA/E as excellent field data entry and clipboard entry devices at many field events. Refer to: http://aprs.org/aprsevent.html

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

Individual Information Access

The KENWOOD individual radio displays enhance the dist ri bution of ham radio information to a large number of users by giving them individual front panel and keypad access to all of the online APRS data. A common m istake of fixed operations with computers is the use of large display screens for large groups to see but which fails to recognize the individual needs of a given viewer and the depth of information available under each symbol on the map. The individuality of APRS radios with individual display s spreads this data access throughout the users in the field.

Overlay Characters on all Symbols

The KENWOOD TH-D74A/E shows the overlay character of all symbols, not just the original subset of special symbols. This provides hundreds of new symbol combinations for better APRS application to new uses.

Voice Operating Frequencies

A very i mportant feat ure of the new TH-D74A/E is the recognition of the value of the voice operator frequency as a fundamental communications parameter. Not only does the radio automatically include its own voice band frequency in every transmitted position packet, it also has special displays and features that make this information readily available. For example, the station list can be sorted to bring Frequency Objects to the top of the list in f requency order. Further, the radio can tune to these frequencies for quick QSO with a single press of the “Tune” menu.

EchoLink, IRLP, Winlink or D-STAR Frequencies

The TH-D74A/E “Tune” function not only makes rapid QSY to another station operator easy, it also facilitates quick tuning to nearby EchoLink, IRLP, Winlink or D-STAR frequencies with the push of a single key. Future use of this capability is anticipated to automatically and seamlessly integrate callsign-to-callsign calling from RF via local, national and global ham radio V oIP and D-STAR systems.

tes:

If all you think of when you hear the word APRS is maps and st agnant icons, then you are not using the full potential of APRS.

If all of the local information that can be of i m m edi ate value to the APRS HT or mobile operator is not showing up in your local area, t hen get active and get involved in supplying this content and updating all local digipeaters to supply it direct to users without multiple hops.

APRS is a communication tool, not just an automat ed map. Use it. But in most cases, that means entering data, not just watching it.

KENWOOD has provided the APRS handheld and mobile information display capability, it is up to us to provide content!

September 2017 WB4APR Bob Bruninga

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2 ENJOYING APRS (by BOB BRUNINGA, WB4APR)

Person Fire Truck Red Cross EchoLink

Bicycle Canoe Lighthouse Node

Motorcycle Boat Speedpost GATEway

Car Sailboat WorkZone DF station

Bus Balloon

Wreck/ Obstruction

Dish Antenna

Railroad Engine

Glider Sheriff PC user

Home Helicopter Fire SSTV

Yagi@QTH Aircraft Sunny ATV

KENWOOD

Large Aircraft

Gal e Fl ags BBS

Radio Shuttle Tornado APRStt

RV Satellite

Nat ion al WX Serv ice Site

RACES

Van Rover

WX (Weather Station)

ARRL

Jeep Eyeball Digipeater X

Truck

Portable (Tent)

Mic-E Repeater

Triangle

Truck

(18-wheeler)

HAM Store

QSO Repeater

Small Circle

Police School Circle Red Dot

Ambulance Hospital IRLP

Big Question Mark

2.17 List of icons that can be set / displayed on the TH-D74A/E

(The icon designs below are supervised by Mr. Bob Bruninga, WB4APR)

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3 APRS

3.1 APRS Feature on the TH-D74A/E

This section will introduce you the many enhanced APRS features of this new digital portable.

Relative Direction Display (Ne w Feature) 3.1.1

While the TH-D72A/E also comes with a feature that shows the dir ection in which the target station is located relative to my station, the display of this feature has been enhanced significantly on the TH-D74A/E. The direction in which my station is advan cing is displayed at the center of a big compass, while the direction in which the target station is located as well as its advancing direction is shown on the circu mference for easy identification.

The display can also be toggled between North Up and Heading Up by pressing

key. Based on the display, it is possible to figure out whether the target station is

[F]

moving toward the same advancing direction as m y station. Example: When W4DJY-9 (target st ation) is located at 45 degrees from my station and

moving south-eastward at a speed of 70 mph.

ransmission of Object/Item Information (New Feature) 3.1.2

The TH-D74A/E supports transmission of object and item i nformation. "Object information” transmission of object and i tem information. Not possess a radio, like a hurricane or a marathon runner. These objects are characterized by a time stamp they possess. "Item information”, like a hurricane or a marathon location, these do not have a t i m e st am p.

Object and item information are transmitted using the predefined object name and item name respectively. When data of an object or item is received, the object name or item name appears in the Callsign display area.

Live Object/ Live Item When sending out information on an object or item , configure "Type" to Live Object or Live

Item if the information is only valid for a certai n peri od of t ime (e.g. , period when a hurri ca ne exists, period when a marathon race is held).

Killed Object/ Killed Item When the information is no longer valid, t he user who has sent out the object or item

information must select Killed Object or Killed Item as "Type" and send out the obje ct data or item data.

Menu No. 516）

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Disclosing Audio Standby Frequency (QSY Feature) 3.1.3

APRS makes use of a wide-band data frequency, which basically cannot be used for audio communication. Therefore, disclosing the f requency that can be used for audio communication helps to facilitate the communicat ion proce ss. For example, during communication at remote locations such as in a m ountain, announcing the frequency for audio communication via the APRS beacon makes it easier to establish communi cati on with a nearby amateur radio station.

Let us look at how we can carry out audio communi cation on band A and APRS data communication on band B. In general, positional information on of one's own station is transmitted periodically as an APRS beacon in the case of band B. In this case, it is possible to embed the frequency information of a non-data band (band A in this example) in the APRS data. This is known as the QSY feature.

When sending out information such as like that of the a audio repeater and or EchoLink as QSY information, informati on on Tone/ Shift/ Wide can also be appended applied as needed in addition to the frequency information.

"F" is displayed when APRS received data that contains QSY information. The user at the radio station that has received the data can operate the “Tune” function to shift the non-data band to the VFO mode, which enables the frequency to be adjusted automatically according to the audio frequency of the other station.

Sending out QSY information in this way by this method easy and very certain way of shifting the other station to the audio communication channel.

isclosing D-ST AR St andby Information with the QSY Feature (New Feature) 3.1.4

The TH-D74A/E also allows disclosure of the D-STAR standby information using the QSY feature. Operating the “Tune” function of the station that has received the D-STAR standby information enables the information of the station to be adjusted automatically according to the D-STAR configuration information of the transmitting station.

For example, during D-STAR audio communicat ion on band A and APRS data communication on band B, the frequency of a non-data band (band A i n this example) and the D-STAR access repeater Callsign can be em bedded in the APRS data and transmitted as a beacon.

If the DR mode of D-STAR is configured, APRS data that is embedded with the acc ess repeater Callsign of one's own station will be transmitted. B y operating the “Tune” function of the station that has received this APRS data, the non-data band switches to t he DR mode and enters the gateway CQ state, and the access repeater Callsign of the receiving station is configured to TO Call.

If the DV mode of D-STAR is configured, the repeater Callsign is not embedded in t he APRS data as a repeater is not used (the f requency inf ormation is embedded). The user at the radio station that has received the APRS data can operat e the “Tune” function to shift the non-data band to the DV mode, which enables the V FO frequency to be adjusted automatically according to the standby frequency of the other station.

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）

Restricting QSY Information (New Feature) 3.1.5

This is a new QSY feature for the receiving end. It is used to restrict the “Tune” operation to only data within a specified distance range from one's own station.

For example, if the receiving station in the FM mode or DV mode is located at a remote location that is unable to receive radio signals directly, the “Tune” operation would be meaningless.

In this case, a distance range can be conf igured to restri ct tuning of these re ceivi ng statio ns.

Menu No. 523）

acon Transmission from a Fixed Position During GPS Track Logging 3.1.6

For models up to until the TH-D72A/E , GPS information is always used when GPS is turned on for APRS beacon transmission. This can be inconvenient in c ases where a station wants to enable track logging but does not want to reveal its position to other stations.

On the TH-D74A/E, the positional information selected in the menu is used for the beacon. The options available are: "GPS" and "My Position 1" to "My Position 5". A station is abl e to turn on GPS to obtain the track log while confi guring its own position to "My Position 1", for example.

Menu No. 401

egistering the Beacon of My Station that is Digipeated in the Station List 3.1.7

For models up to the TH-D72A/E, the beacon of my station that is digipeated is not registered in the APRS station list.

However, it is now registered on the TH-D74A/E. This allows a station to check the APRS information that is being transmitted from an obj ective viewpoint.

3.2 What is a KISS modem?

What is KISS? 3.2.1

KISS is the abbreviation for "Keep It Simple, Stupid". This was proposed by K3MC and KA9Q at the "ARRL 6t h Computer Networking Conference" in 1987. It is a simple modem with protocol control (AX.25 protocol) rem oved from the TNC (Terminal Node Controller).

Using a simple modem, it is equipped with a f unct i on to prevent interference/collision during communication by other stations, as well as functions to add a Frame Check Sequence (FCS) to the transmission data provided and a flag data that indicates the packet frame delimiter. 8 types of serial communication commands are available as an interface with PCs.

74A/E Specifications 3.2.2

TH-D

The TH-D74A/E supports packet speeds of 1200 bps and 9600 bps. The modulation schemes used are AFSK for 1200 bps and GMSK for 9600 bps. The transmit and receive buffer size is 3 kB and 4 kB respectively.

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3 APRS

Command

Functional Description

Configurable Range

Default Value

Data Frame

Transmits data that is configu the command.

TXDELAY

For configuring the time interval from the point when PTT is turned on until when data transmission starts.Units of 10 ms

0 to 120 (78 h)

Varies with the

02 P For configuring the probability of P

0 to 255 (FFh)

128(80h)

SlotTime

For configuring the random number generation time interval of P Units of 10 ms

0 to 250 (FAh)

10(0Ah)

TXtall

For configuring the duration for maintaining the transmission state after FCS (CRC) is transmitted. Units of 10 ms

0 to 255 (FFh)

FullDuplex

For selecting full-duplex or half

0: Half-duplex communication Value other than 0: Full communication

SetHardware

Switches the packet speed.

0 or 35 (23 h) : 1200 bps 5 (05 h) or 38 (26 h) : 9600 bps

Varies with the

Return

Exits the KISS mode.

List of Corresponding Commands 3.2.3

Name

red immediately after

-persistent CSMA.

(Value when KISS mode is On)

TH-D74A/E Menu No. 508 (TX Delay) configuration.

-duplex communication.

-duplex

TH-D74A/E Menu No. 505 (Data Speed) configuration.

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3 APRS

3.3 KISS Mode

An IGate station and or digipeater station can be operated using a PC that is installed with the APRS software and with the KISS mode of the TH-D74A/E.

Operation of Digipeater via Combination of the TH-D74A/E and UI-View32 3.3.1

The TH-D74A/E can be combined with the UI-View32 to form a digipeater.

Press [F] [LIST] in sequence to set the KISS mode to OFF.

Check to ensure that "KISS12” or “KISS96” is not displayed. The "KISS12" or "KISS96" icon is illuminated when the TH-D74A/E is in the KISS mode.

2. Meanwhile, on the UI-View32, open t he Comms Setup window from the Setup pull-down

menu.

In the Comms Setup window, configure the PC terminal requirements of the

TH-D74A/E in UI-View32 as follows.

Baud Rate： 9600 bps (either one); Data Bits: 8; Stop Bits: 1; Parity: None COM Port： COM port number on the PC in use that is assigned as the virtual COM port by the TH-D74A/E.

4. From the Host mode drop-down list, select “KISS”, followed by clicking the “Setup” button.

5. The KISS Setup window appears.

Configure as follows in Into KISS: 1: TN 2,0; 2: Blank; 3: Blank; 4: Blank. Next, click the “OK” button to close the KISS Setup window.

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Click the “OK” button in the Comms Setup window to close the Comms Setup

window.

A command is sent from UI-Vi ew32 to t he built-in TN C of the TH-D7 4A/E, and t he

built-in TNC shifts to the KISS mode. The "KISS12" or "KISS96" icon lights up when the KISS mode of the TH-D 74A/E is turned

on. While in the KISS mode, configurations related to APRS of the TH-D74A/E unit

Menu Nos. 500 to 580) will not be applied to the operations.

( For details on the other configurations of the UI-View32, please refer to the descriptions in

the Help file.

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4 ENJOYING D-STAR (by DON ARNOLD, W6GPS)

4.1 Encounter with D-STAR

I have been a Ham since the early 1970s, so I lov ed talking HF and Local repeater operations. Several places I lived in had antenna restriction s, but somehow I would be able to hide an antenna or just work worldwide HF in the car. I did do a little D-STAR around 2010. It was ok, but limited to where a repeater was and h ad l im i ted access to the D-STAR network. So I set it aside.

When the KENWOOD TH-D74A/E was released August 2016, I tried m y D-STAR experience again. Now, instead of having to depend on D-STAR r epeaters, mobile Access Points along with mobile Hotspots opened up a br oader more accessible D-STAR experience. In the first 4 hours on the air with my new KENWOOD TH-D74A/E, I worked 15 new countries that I thought I would never get.

I find the majority of D-STAR activity is with a Hotspot and D-STAR Access Point. Examples of the Access Point are DV Mega, openSPOT, and the popular DVAP. In the first QSO’s I have had with the TH-D74A/E, people remarked about the audio quality. The TH-D74A/E has DSP processing before and aft er the AMB E encoder. You can cu st om i ze both mic audio and receiver audio with the built in graphic equalizers.

My advice to the first time user of the TH-D74A/E is to learn a few features at a time. You can get overwhelmed with this featured enriched handheld transceiver. Please check out some of my TH-D74A/E instruction videos at https://www.youtube.com/user/w6gps.

I have simple setup video instructions there.

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4 ENJOYING D-STAR (by DON ARNOLD, W6GPS)

▼

Gateway CQ

Individual Call

4.2 Enjoy with D-STAR

You will have to get yourself registered first on the D-STAR network server. Go to http://www.dstargateway.org/D-Star_Registration.html and register.

The TH-D74A/E’s DR mode for D-STAR means Digital Repeater. It is a series of commands to tell the D-STAR network what to do from your radio.

So, for me in Chattanooga, State of Tennessee (TN) in USA, to get to my repeater, I hold down the bottom key on the multi-scroll key[ menu, so I can locate Chattanooga [W4PL B] module.

When I select this, the frequency (443.15 MHz) is selected along with the repeater name “Chattanooga”. So I am getting ready to tell the [W4PL B] module what to do.

I hold in the multi-scroll key[▲] for 2 seconds and I get a list on the "Destination S elect" Menu. If I want a local CQ (only Chattanooga Area) I select the “Local CQ”. And talk local Chattanooga. This would be output to the [W4PL B] module and I would be transmitting to the local area.

The "Gateway CQ" in the "Destination Select" Menu would mean I wante d m y signal se nt to another repeater like [K6VO C] module. This way I can talk t o m y California friends.

Another option is I can input a callsign for the "Individual Call" (Callsign routing) in the "Repeater Select" Menu. Both of these transmissions are possible, but not 100 percent dependable.

] for 2 seconds to use the "Repeater Select"

The best If your local repeater allows it, you can tran smi t to the repeater a command to link to a reflector.

For example: to link to reflector 30 C you would select link to a reflector, hit [ENT] key, and use the encoder dial in “REF030CL” and press [PTT] for about 1 second.

This command is sent to the D-STAR network and y our repeater is linked to the reflector 30C. You should get a response from the repeater that is “linked to 30 C”

way to get on the D-STAR is to use the “Reflector” menus.

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4 ENJOYING D-STAR (by DON ARNOLD, W6GPS)

Setting the reflector's number/module

Response from the repeater

One you c "Use Reflector". A command of “CQCQCQ” will be sent and you can talk on 30C.

When your QSO is finished, it is good practice to unli nk from the reflector, so go back and select "Unlink Reflecto r " to use the unlink command "_______U".

onfirm this, you have to go back into the "Reflector" Menu and select

4.3 D-STAR Reflector operation

So here is the simple sequence: Select your repeater and list en. If you want to link the repeater to a reflector then input the reflector name, press [PTT] for about 1 second. Listen for acknowledgement, then select "Use Refl e ctor".

Sound easy? I hope so. DR mode is the simplest and most efficient way to change radio commands.

It gets even better if you get your own repeater! You mean I need to put-up a tower and antenna? No I am referring to the Access Point, also known as Hotspot. People use the term Hotspot referring to a small low power device connected to a wired internet connection or mobile Hotspot Wi-Fi over a mobile cellular net work.

I have both. For my wired network connection, I use an openSPOT. It is self-contained lower power simple D-STAR enabled dev i ce t hat is very easy to use.

So in simple terms I program the openSPOT with VoIP comm unications a sim plex frequen cy according to Amateur band recommendations for low power simplex operations. With this, I can talk to my lower power Access Point and tell it what reflectors to go to. I love reflectors as they have more people operating and you can have nice QSOs.

If you have to move your QSO you can tell the Access Point to go to another reflector by selecting a new reflector via input using the encoder.

This way you can have more control of your reflectors instead tying up a local repeater. Now I have saved the best for last, mobile Access Point or mobile Hotspot. I use the DVAP (Digital Voice Access Point) from Internet Labs and a small Raspberry Pi Zero W. (DVAP is low power transmission 10 mW)

We refer to the Raspberry Pi as a Pi with is a very small computer, to which the DVAP, a simple Access Point that the TH-D74A/E transmits to and controls. The Pi and DVAP are connected wirelessly to a mobile Hotspot that gets to the internet via cellular mobile phone network. This whole system is about the size of 2 packs of chewing gum.

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4 ENJOYING D-STAR (by DON ARNOLD, W6GPS)

SharkRF openSPOT

Lower Red case is DVAP, the upper is Raspberry Pi Zero W

So what is the coolness of this system? I can work coast to coast on low power in my car. In fact, I can work the world from my HT

(Handheld Transceiver) in the car or from a hotel room with this simple setup. As long as I have mobile cellular service.

I can have access to the world of D-STAR network.

I know it

is hard to visualize this, but go to my videos at

https://www.youtube.com/user/w6gps, There you can see all this in action. In all my 40 years as a ham I have had even more

excitement using the KENWOOD TH-D74A/E on the D-STAR network. I have meet many new hams worldwide without enduring SSB noise.

For you veteran D-STAR users try not to make more things complicated. It is easy with the TH-D74A/E. For my new D-STAR KENWOOD’s TH-D74A/E users, take your time and get on the air.

While you’re waiting for verification and registration on the D-STAR radio, get familiar with the many different features of the TH-D74A/E. If you’re an owner of the TH-D72A/E or TH-F6A/F7E this radio will be very familiar.

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4 ENJOYING D-STAR (by DON ARNOLD, W6GPS)

Simultaneous reception of D-STAR and HF SSB

FM radio mode A packet sent from ISS

My position packet digipeated by ISS

4.4 About the TH-D74A/E

You have a very powerful 5-watt amateur radio device the KENWOOD TH-D74A/E. I view as 4 radios in one.

An SSB/Broadcast receiver, digital D-STAR transceiver, FM analog transceiver, and powerful standalone APRS communicator.

I have li I have made friends communicating on the Worldwide D-STAR network. I have even made an APRS contact to the ISS (International S pace Station). I hope I have motivated you to see how much enjoy ment you can have with your

KENWOOD TH-D74A/E.

September 2017. W6GPS Don Arnold

stened to SSB on the ham bands and broadcast stations around the world.

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5 D-STAR

5.1 Basic Operation

Note: For communication (gateway communication) via the Internet, it is necessary to

register the Callsign with the "D-STAR Management Server" suc h as US Trust Server. (There are other systems as well, they have their own registration process.).

tart with Configuring the Callsign of One's Own Station 5.1.1

To enable transmissi on via D-STAR, users first need to configure the Callsign of one's own station.

Note: Tr ansmission in the DV/DR mode is not possible unt i l conf iguration is complete.

Call up Select the number to register Callsign, and pres s [A/B] Enter the Callsign

Press [ENT] The Callsign of one's own station is configured.

Menu No. 610

5.2 Communication Using D-STAR

Difference between the DV and DR Modes 5.2.1

The DV mode is used to carry out simplex communi cation where two transceivers communicate with each other directly without using a repeater. The DR mode is used when a communication is carried out via a repeater. (For repeater lists that are preset or edited in advance, it is possible to select and commu nicate in the D R mode.) I t is possible to toggle between the DV and DR modes from the Digital Function Menu.

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5 D-STAR

DR Mode

DV Mode

▲/▼

Using the Digital Function Menu 5.2.2

1. Press [MODE] to switch to the DR mode

2. Press [F] [MODE] in sequence

The Digital Function Menu is displayed.

3. Select "DV/DR Select" and press [A/B]

Doing so toggles between the DV mode and DR mod e.

arrying out Simplex Communication 5.2.3

1. Configure the frequency using the [

2. Press [MODE] to switch to the DR mode.

If the TH-D74A/E is in the DV mode, go to Step 4.

3. Switch to the DV mode in the Digital Function Menu

4. In the Digital Function Menu, select "Select Target"

The Destination Select screen appears.

] or [ENC] control

5. Select "Local CQ" and press [ENT]

"TO" is now configured as "CQCQCQ".

6. Press [PTT] to start transmission

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5 D-STAR

▲

5.3 Communicating Using a Repeater

Local Area Call 5.3.1

Local Area Call (Local CQ) this is a method of communication that uses only one D-STAR repeater. It is similar to the conventional method of communication using FM repeaters. By configuring "TO" as "Local CQ" while in a state where radio signals are able to reac h the access repeater selected in "FROM", a local CQ can be configured by pressing [PTT].

5.3.1.1 Configuring the access repeater ([FROM])

1. Press [MODE] to switch to the DR mode

2. Press and hold [▼]

The Repeater Select screen appears.

3. Select "Repeater List" and press [ENT]

The World Region/Country/Group Select s cr een appears.

4. Select the regional group you are located, and press [ENT] to display the Repeater List.

5. Select a nearby repeater from the repeater callsign, repeat er names or state/prefecture

names. Pressing [►] displays the detailed inform ation of the selected repeater. Pressing [ENT] configures "FROM" to the selected repeater.

6. Configuring the Local CQ [TO]

7. Press and hold [

8. Select "Local CQ" and press [ENT], "TO" is now configured as "CQCQCQ".

5.3.1.2 Checking whether radio signals reach the repeater (kerchunk)

1. Press [PTT] for about 1 second and transmit

2. Check the response

If a response is received from the repeater within 3 seconds and < > appears on the pop-up screen, it means the radio signals have reached the repeater you are using and radio signals are properly transmitted from the repeater that is being accessed. However, if there is access from another station within 3 seconds, a pop-up screen showing the response from the repeater will not appear.

3. Press [PTT] to start transmission and make calls such as a CQ call

] , and the Destination Select screen appears.

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5 D-STAR

Gateway Call 5.3.2

By configuring "TO" to the repeater of the area to communicate with, followed by pressing PTT, it is possible to establish communication with the stations that are able to access the repeaters of the area.

The access repeater configured in "FROM" is connected via t he Internet with the area repeater configured in "TO", thus enabling calls to be made to an area where radio signals cannot be received directly.

As with a Local Area Call, configure "FROM" as the repeater that is di rectly accessible, followed by configuring [TO] for the target according to the steps below.

1. Press and hold [▲]

The Destination Select screen appears.

2. Select "Gateway CQ" and press [ENT]

The World Region/Country/Group Select s cr een appears.

3. Select the regional group that corre spond s t o the re peater t o con nect t o, and p res s [ENT]

The Repeater List appears.

4. Select the repeater to connect to

Pressing [►] displays the detailed inform ation of the selected repeater. Pressing [ENT] configures "TO" to the selected repeater. Check whether connection to the area repeate r configured in "TO" can be established. As with a Local Area Call, perform kerchunk to check whet her connection can be established.

Response to Gateway Communication 5.3.3

When there is a call with a specified Gateway CQ or Callsign in the DR mode, a call back to the calling station is made by configuring the Callsign of the calling station in [TO] of the caller.

5.3.3.1 ・Manual configuration

1. Af ter transmission to the receiving station is complete, press and hold [ENT]

2. Select the Callsign of the calling station on the Call History Select screen, and press

[ENT] The Callsign is configured in "TO" and the gateway communication route is automatically selected.

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5 D-STAR

5.3.3.2 Automatic configuration (Direct Reply function)

On the TH-D74A/E, when transmission by the calling station i s complete and while the reception interrupt screen appears, the tran smission configuration for the receiving station automatically changes to "Individual", and the receivi ng station can make a call bac k to the calling station simply by pressing [PTT].

When direct reply is possible during recept ion, a "Direct Reply" icon will appear in the interrupt screen. When this icon is displayed, pre ssing [PTT] enables automatic transmission in the callback configuration.

"Direct Reply" icon

When both APRS and D-STAR are running concurrent ly, the Direct Reply feature functions when the D-STAR is the operating band. When the detai l s of the APRS St ation List are displayed, the Callsign of the receiving D-STAR station is displayed in one line (top most line) above the interrupt area. When the Direct Reply feature is running, a "*" symbol is displayed beside the Callsign.

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5 D-STAR

5.4 Configuration for Reflector Node

What is a Reflector? 5.4.1

A reflector is a server that is connected to the Internet. Audi o packets that are transmitted via the Internet are duplicated and relayed at the same time to other connected devices in a manner that resembles a reflector. By connecting to a reflect or via devices such as a D-STAR repeater that has dplus (software) inst al l ed in the gateway system, or a DV (Digital Voice) node device for connecting a reflector (Access Point), it is possible to com m unicate with stations at a remote location. (We do not provide support for node devices used for reflector connection.)

Reflector Menu on the TH-D74A/E 5.4.2

By adding a simplex node device's frequency information in the repeater list, the Reflector Menu Select can be used as well as a D-STAR repeater.

When adding a simplex frequency of the node device for reflect or connecti on to the repeat er list, input the string "DIRECT" both for "Callsign" and "Gateway" entry fields in the MCP-D74 Memory Control Program or

Menu No. 210 of the TH-D74A/E.

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5 D-STAR

Selecting "Reflector" during Destination Select 5.4.3

Various reflector commands can be configure d i n "Reflector Menu Select". If other reflector commands are needed, add the comm and in place of the Callsign to the Callsign list in the MCP-D74 Memory Control Program or

Menu No. 220 of the TH-D74A/E.

On the Destination Select screen, select “Individual” and configure the registered command in "TO".

When using Memory Channels for a simplex node device 5.4.4

The memory channels can be edited as follows to enable access to the node device for reflector connection.

1. Read the configurations from the transcei ver using the MCP-D74, followed by clicking

"Memory Channel" to add a frequency for the node device f or reflector connection.

2. Click "Display Item (Y)" and select the "Mode" and "URCALL" checkboxes.

3. Set "Mode" to "DV".

4. Create multiple memory channels with the same frequency, and configure the different

commands such as "CQCQCQ" and "REFXXXXL" in "URCALL". If character str i ngs other than "DIRECT" need to be entered into "RPT1" and "RPT2" to enable control of the reflector device, click "Display Item (Y)" and select the "RPT1" and "RPT2" checkboxes accordingly, and configure "Mode" to "DR".

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5 D-STAR

5. Write back the data edited in t he M CP-D74 to the transceiver.

6. By switching the memory channel instead of t he Re flector Menu in the DR mode,

it is possible to select the command to be sent to the reflector configured in "URCALL".

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5 D-STAR

5.5 How to Update the Repeater list

The repeater list can be imported to your TH-D74A/E by using MCP-D74 or a microSD memory card.

Please download the Repeater List file "D74_yyyymmdd_E.tsv" ("yyyymmdd" is the numerical release date) from the following KE NWOOD website in advance.

http://www.kenwood.com/i/products/info/amateur/software_download.html

By using MCP-D74 5.5.1

1. Connect the TH-D74A/E and the PC via a Micro-USB cable.

2. Start the MCP-D74.

3. Read data from the TH-D74A/E.

4. Click [Repeater List], [Import Repeater List from File...], and click [OK]

5. Select the downloaded Repeater List f i l e "D74_yyyymmdd_E.tsv".

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5 D-STAR

6. Click the check box of "TH-D74A (K -type/U.S.A. and Canada)", or "TH-D74E

(E-type/Europe)" and click [OK].

7. The D-STAR Repeater List which is mainly focused on North America or Europe

will be imported to the MCP-D74.

8. Write data back to the TH-D74A/E from the MCP-D74. Then the TH-D74A/E's Repeater

List will be updated.

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5 D-STAR

By using a microSD card 5.5.2

1. Install a microSD card to the TH-D74A/E.

2. Acce ss the TH-D74A/E's

Menu No.980 (USB function) and set the transceiver to Mass

Storage mode.

3. Connect the TH-D74A/E and the PC via a Micro-USB cable.

4. Copy the downloaded Repeater List file "D74_yyyymmdd_E.tsv" to the microSD card

folder [KENWOOD]-[TH-D74]-[SETTINGS]-[RPT_LIST].

5. Remove the TH-D74A/E from the PC.

6. Access

Menu No. 812 (Import - Repeater List only) and press [ENT].

7. Select the copied Repeater List File and press [ENT].

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5 D-STAR

8. Select "Data for TH-D74A" or "Data for TH-D74E" and press [ENT] or [A/B] [OK].

9. The Repeater List which is mainly focused on North America (when selected "Data for

TH-D74A") or Europe (when selected "Data for TH-D74E") will be imported from the microSD card to the TH-D74A/E.

10 Press [A/B] [OK] to restart the TH-D74A/E. Then the TH-D74A/E's Repeat er Li st wil l be updated.

Page 45

6 Settings & Controls

（→

）

（→

）

（→

）

6 Settings & Controls

6.1 Extending the Battery Life

The TH-D74A/E is equipped with a wide variet y of hardware devices. You can minimize battery power consumption by turning off features that are not used or adjust the setting t o reduce power consumption.

Disable GPS 6.1.1

The built-in GPS receiver is enabled by default. T he user may turn off the GPS if not needed.

Menu No. 400

Note: Purchase of this tray default the transceiver is shipped with the GPS enabled this will

allow the radio to update the clock aft er a GPS.

Disable Bluetooth 6.1.2

To conserve power consumption if not need to turn off Bluetooth.

Menu No. 930）

Backlight Adjustment 6.1.3

The LCD and keypad backlight consume a great deal of power if left on all the time. Battery life may be enhanced by using the following backligh t adjustments.

・Set Backlight Control to “Auto” or “Auto (DC-IN)”. When the transceiver is running on battery power, you can select "Auto" or "Auto (DC-IN)"

to turn on the backlight by operating the panel key. The backlight will turn off automatically after the time interval configured in "Backlight Timer" has elapse d.

・Shorten the time interval configured in the Backlight Timer. ・Reduce the brightness of the backlight (LCD Brightness).

Menu No. 901）

Menu No. 902）

Menu No. 900

Utilize the Battery Saver feature 6.1.4

The Battery Saver feature turns the receiver circuit on and off intermittently when no signal is received and no key is pressed for an interval of five (5) seconds. The interval for the receiver circuit to remain off whi le in the Battery Saver mode may be adjusted in the menu. Setting the off time to a longer duration helps to conserve battery power. However, note that the beginning of the received audio may be truncated if the off time is too long.

Menu No. 920）

Note 1: When the DV/DR mode is set to ON, t he off duration of the receiver circuit wil l be automatically fixed at 200 ms.

Note 2: The Battery Saver feature is disabled when the APRS or KISS mode is set to ON.

Disable Busy Indicator 6.1.5

When a radio signal is received, the Busy indicator (green LED) lights up. Turning off the Busy indicator will help to reduce battery con sumption.

Menu No. 181

Note: It is recommended that the Busy indicator setting in Menu No. 181 be set to “OFF” especially during FM radio broadcast when radi o signals are received continuously.

Page 46

6 Settings & Controls

（→

）

（→

）

（→

Enable Single Band mode 6.1.6

Set to the Single Band mode when there is no need to run two bands at the same time.

[F]－[DUAL]

Adjust Volume Balance 6.1.7

When the transceiver is running in the APRS or KISS mode, adjust the volume of the band used in the mode.

Menu No. 910）

Utilize Auto Power Off 6.1.8

The Auto Power Off feature prevents the battery power from draining when the power of the transceiver is left on accidentally. In the factory setting, the power of the transceiver is turned off automatically when there is no key operation for an interval of 30 minut es.

Menu No. 921）

6.2 Silent APRS and Packet Communications (Voice Alert)

The TH-D74A/E is capable of receivi ng radio signals of two different frequencies at the same time. For example, if band A is u sed f or APRS comm unication and band B for voice communication, data bursts sound may be em i tted when receiving packets for band A.

Volume Balance 6.2.1

The TH-D74A/E has only one volume control, but i t is equipped with a function for adjusting the balance between the volume of band A and band B.

Menu No. 910

V oice Alert 6.2.2

The Voice Alert f eature makes use of CTCSS. The CTCSS used for Voice Alert is referred to as voice alert frequency. Audio is from the speake r onl y when signals with the matched CTCSS coincides with the voice alert f requency are received.

For example, when calling a party to arrange a meeting time and place, it would be necessary to press the [PTT] key repeatedly as the caller would not kno w whether the signals have reached the receiver successfully. With the Voice A lert feature, the caller is able to wait until the voice call is established without having to press the [PTT] key.

First of all, the speaker sound is muted when both users turn on the Voice A l ert feature. Next, when APRS beacon is turned on and both users move away from each other , the sound received from the beacon is from the speaker when both users move to a distance where signals can be received directly. In ot her words, when the sound received from the beacon is heard, this means a voice call can been established.

6.3 Screen Capture of Radio Display

Screen Capture 6.3.1

The TH-D74A/E comes with a Screen Capture feature that is commonly found on smartphones. By assigning the Screen Capture feature to any of the keys on the optional SMC-34 Speaker Microphone with Programmable Function Keys and Volume Control, a screenshot can be captured by pressing programmed key (PF1/PF2/PF3), and the captured image will be saved to the microSD card.

Menu No. 942/ 943/ 944）

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6 Settings & Controls

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）

（→

Frequency Band [kHz]

Variable Range [dB]

0.4

-9 ～ ±0 ～ +9

0.8

-9 ～ ±0 ～ +9

1.6

-9 ～ ±0 ～ +9

3.2

-9 ～ ±0 ～ +9

6.4

-9 ～ ±0 ～ +9

The screenshot is saved as a 24-bit color bitmap image with a resolution of 240x180 pixels and a size of 128 KB. The image is saved at the location bel ow inside the microSD card.

\KENWOOD\TH-D74\CAPTURE\

6.4 Viewing microSD Card on PC

To view the files saved in the microSD card of an electronic device on a PC, i t is necessary to unmount the microSD card, remove it from the device, insert it into an SD card adapter or USB adapter, followed by connecting the adapter to a PC f or i t to be recognized as a removable disk.

Mass Storage feature 6.4.1

With the TH-D74A/E, connecting it to a PC with a USB cable, the m icroSD car d can be u sed as a removable disk. To make use of this feature, it is necessary to configure the USB function of the TH-D74A/E to "Mass Storage".

Configure the USB Function to "Mass Storage" in the menu, followed by connecting the transceiver to the PC using a Micro-USB cable.

Menu No. 980）

Note: The Mass Storage feature of the TH-D74A/E is only supported on Microsoft Windows

systems. Although the microSD card may also be recognized on a Linux OS, the file size cannot be displayed correctly.

6.5 Adjustment of RX Audio Quality

Different users have different sound quality preferences. The TH-D74A/E comes with an Audio Equalizer feature that allows users to adjust the sound quality according to their preference.

DSP audio sound processing 6.5.1

The DSP (digital signal processor) on the TH-D74A/E ensures that all transceiver audio signals are properly processed. Audio signal s in the analog FM mode are also converted temporarily to digital signals by an A/D converter, after which sound proce ssing is applied within the DSP and the signals are restored to analog signals by a D/A converter and output from the speaker.

RX Equalizer 6.5.2

The RX Equalizer feature is made possible by pro cessing of all received audio signals by the DSP as described above. The aud io frequency band of the R X Equalizer is divided into five (5) different bands, each of whi ch can be adjusted within the range of -9 dB to +9 dB. User can therefore adjust the frequency properties of the audio signal to their preference.

Menu No. 913

The equalizer can be set to ON or OFF.

Menu No. 911）

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6 Settings & Controls

（→

）

（→

Frequency Band [kHz]

Variable Range [dB]

0.4

-9 ～ ±0 ～ +3

0.8

-9 ～ ±0 ～ +3

1.6

-9 ～ ±0 ～ +3

3.2

-9 ～ ±0 ～ +3

6.6 Adjustment of TX Audio Quality

Similar to the received, the TX audio sound input from the microphone is also processed by the DSP, thus enabling adjustment using the TX Equalizer.

TX Equalizer 6.6.1

The audio frequency band of the TX Equ alizer is divi ded into four (4) dif ferent ban ds, each of which can be adjusted within the range of -9 dB to +3 dB .

Menu No. 912

Users can choose whether to apply the propertie s of the preset equalizer to analog FM, digital (D-ST AR) or both.

Menu No. 911）

6.7 Wide-band and Multi-mode Reception

The TH-D74A/E is capable of receivi ng signals between the bandwidths of 0.1 MHz to

523.995 MHz.

Although a wide bandwidth range has already been achieved on the predecessor model, TH-F6A/F7E, many enhancements have been made and new features are introduced on the TH-D74A/E.

Wide-band reception is only possible on band B (lower half in the display). (Band A is only lim i ted to amateur bands including 144 MHz, 220 MHz

The 220 MHz band is only available to US A and Canada market.

and 430 MHz.

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6 Settings & Controls

Operating Band

Frequency Band

Demodulation Mode

Band A

144 MHz

136 ～ 174

FM 220 MHz

216 ～ 260

FM 430 MHz

410 ～ 470

Band B

LF/ MF

0.1 ～ 0.520

0.520

～

1.710

～

3.5

0.1

3.5 ～ 4.0

(FINE Mode ON)

LSB

4.0 ～ 7.0 AM

7.0 ～ 7.3 LSB

7.3 ～ 10.1

10.1

～

10.15

～

14.0

～

14.35

USB

14.35

～

18.068

～

18.168

USB

18.168

～

21.0

～

21.45

USB

21.45

～

24.89

～

24.99

USB

24.99

～

28.0

～

29.7

USB

50 MHz

29.7

～

51 ～ 54

10 54 ～ 76 5 FM Radio

76 ～ 108

100

WFM

118 MHz

108 ～ 136

12.5

AM 144 MHz

136 ～ 144

144 ～ 148

148 ～ 174

VHF

174 ～ 216

FM 220 & 300 MHz

216 ～ 220

12.5

220 ～ 225

225 ～ 410

12.5

AM 430 MHz

410 ～ 420

12.5

420 ～ 450

25 450 ～ 470

12.5

UHF

470 ～ 524

* The transmission frequencies supported are: UHF: 430.000 to 449.995 [MHz].

Receiving Frequency Range & Demodulation Mode 6.7.1

The default frequency and demodulation mode of each of band A and band B on the TH-D74A/E are shown below.

[TH-D74A]

Frequency Range [MHz] Step [kHz]

VHF: 144.000 to 147.995 [MHz]; 220 MHz: 222.000 to 224.99 5 [MHz];

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6 Settings & Controls

Operating Band

Frequency Band

Demodulation Mode

Band A

144 MHz

136 ～ 174

12.5

FM 430 MHz

410 ～ 470

Band B

LF/ MF

0.1 ～ 0.520

0.520

～

1.710

～

3.5

0.1

3.5 ～ 4.0

(FINE Mode ON)

LSB

4.0 ～ 7.0 AM

7.0 ～ 7.3 LSB

7.3 ～ 10.1

10.1

～

10.15

～

14.0

～

14.35

USB

14.35

～

18.068

～

18.168

USB

18.168

～

21.0

～

21.45

USB

21.45

～

24.89

～

24.99

USB

24.99

～

28.0

～

29.7

USB

50 MHz

29.7

～

51 5 FM

51 ～ 54

10 54 ～ 76 5 FM Radio

76 ～ 108

WFM

118 MHz

108 ～ 136

12.5

AM 144 MHz

136 ～ 144

144 ～ 146

12.5

146 ～ 174

VHF

174 ～ 230

FM 220 & 300 MHz

230 ～ 410

12.5

AM 430 MHz

410 ～ 430

12.5

430 ～ 440

25 440 ～ 470

12.5

UHF

470 ～ 524

* The transmission frequencies supported are: 144.000 to 145.995 [MHz]; UHF: 430.000 to 439.995 [MHz].

[TH-D74E]

Frequency Range [MHz] Step [kHz]

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6 Settings & Controls

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6.8 Mode

In the SSB, CW and AM modes, the 10.8 kHz IF signal obtaine d after the 3rd Mixer is inputted the DSP, and IF filter. Detection is carried out during digital signal processing. The design of the IF filter and detection is adapt ed to the handheld transceivers based on the design of our HF transceivers.

SSB 6.8.1

In the SSB mode (LSB, USB), the high-cut frequency can be adjusted in the receiving filter configuration. A high-cut frequency can be selected from 2.2 k Hz/ 2.4 kHz/ 2.6 kHz/

2.8 kHz/ 3.0 kHz. The low-cut frequency is fixed at 200 [ Hz]. Changing the high-cut

frequency switches in the IF band pass filter (BPF). For example, if the high-cut frequency is configured to 2.4 kHz, the passband of the IF filter becomes 2.2 kHz.

Menu No. 120

CW 6.8.2

In the CW mode, the passband (Band Width) can be adjusted in the receiving filter configuration. The passband can be selected from 0.3 kHz/ 0.5 kHz/ 1.0 kHz/ 1.5 kHz/

2.0 kHz. Changing the passband switches the IF f i lter (BPF).

In addition to the receiving filter, there are also configurations in cluding pitch frequency and CW reverse. Pitch frequency refers to the frequency f or pl aying back the Morse signals received as demodulated audio signals when the carr ier coincid es exact ly wit h the receiv ing frequency. A pitch frequency can be selected from 400 Hz/ 500 Hz/ 600 Hz/ 700 Hz/ 800 Hz/ 900 Hz / 1000 Hz.

Menu No. 170

Menu No. 121

CW reverse is a configuration for determining w hether to carry out detection in the CW mode as LSB or USB. CW reverse can be selected from Normal / Reverse. USB is chosen in the Normal mode and LSB in the Reverse m ode.

Menu No. 171

AM 6.8.3

In the A M m ode, the high-cut frequency can be adjusted in the recei ving filter configuration. A high-cut frequency can be selected from 3.0 kHz/ 4.5 kHz/ 6.0 kHz/ 7.5 kHz.

The low-cut frequency is fixed at 200 Hz. Changing the high -c ut frequency switches the IF filter (BPF). The passband of the IF filter in the AM mode is double that of the high-cut frequency. For example, when the high-cut frequency is configured to 4.5 kHz, the passband of the IF filter becomes 9 kHz.

Menu No. 122

IF Signal Output, Detection Signal Output 6.8.4

In addition to the received audio signals, t he TH-D74A/E is also able to output IF signals or detection signals to the built-in speaker, external speaker jack or USB audio. When the IF signal is selected in the "Detect Out Select" m enu, IF signals for the SSB or AM mode are converted into IF signals with a center frequency of 12 kHz and output. When detection signal is selected, the signal before the De-Emphasis filter output in the FM mode, while the signal after the detection is output in the SSB, CW and AM m odes. When IF signal or detection signal is selected, the RX Equalizer wil l not be applied to the audio output.

Operation of the "Detect Out Select" Menu, output of IF signals and output of det ect i on signals work when the transceiver is in the S i ngl e B and mode and the operating band is band B.

（→ Menu No. 102

Note: There are some restrictions on the operation and behavior during output of IF or detection signals. For more details, please refer to the user manual.

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6 Settings & Controls

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FM Radio mode

（→

Fine Mode, Step 6.8.5

When the reception mode is SSW, AM or CW, using the “FINE mode” enables tuning in finer step frequencies. The step frequency of the “FINE mode” can be selected from 20 Hz/ 100 Hz/ 200 Hz/ 1000 Hz. The smallest step frequency, which was 33 Hz on t he TH-F6A/F7E, has been narrowed down to 20 Hz on the TH-D74A/E to enable tuning for great er l i st ening comfort.

FM Radio 6.8.6

There are two (2) methods of FM radio reception. One of them i s to sel ect the frequency o f band B in the FM radio band, while the other is to set the FM Radio mode to

Menu No. 700.

on in By turning on the FM Radio mode, it is possible to re ceive F M r adio signals whil e APRS and

D-STAR are running. When radio signals are received on band A or band B, the display switches to the normal

frequency screen to receive the signals, while the FM radio is temporarily muted. After communication is finished in this state and no signal is received on band A or band B for a time interval specified in the menu, the display ret urns to the FM radio broadcast reception screen.

（→ Menu No. 701

The frequency range of FM radio is from 76.0 M Hz to 107.9 MHz, which supports reception of supplementary FM (wide FM) broadcasts.

The FM Radio icon lights up when the F M Radio mo de is tu rned on, enabl ing the transceiver to be used exclusively as an FM radio.

・The direct frequency input mode is used ex clusively for the FM radio function in this mode, which simplifies the input of the radio frequency.

・There are 10 special memory channels for FM ra dio that also support registration of memory names.

・The [M/V] key is used to toggle between the “VFO mode” and “MR mode”. ・To start scanning, press the [Seek] key. When an FM station i s found, "<< Tuned >>" is

displayed and scanning stops. ・When receiving FM radio signals at a location where reception is unstable, lengthening the

"Auto Mute RET. Time" helps to reduce switching between the normal frequency mode and the FM Radio mode.

Menu No. 701）

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6 Settings & Controls

Example of Registered Name

0 to 99

Group 0

GRP-0

AMA 144

100 to 199

Group 1

GRP-1

AMA 430

200 to 299

Group 2

GRP-2

D-STAR

300 to 399

Group 3

GRP-3

500 to 599

Group 5

GRP-5

Aviation radio

600 to 699

Group 6

GRP-6

AM radio

700 to 799

Group 7

GRP-7

ALL Groups (All memories can be recalled)

Group-0 (Only memories registered in the displayed group can be recalled)

6.9 Memory Channels

Using the Memory Groups 6.9.1 The TH-D74A/E offers 30 memory g roups from "GRP-0 to GRP-29". Each memory group can be assigned with a group name of not more than 16 characters. When a new memory is registered, a default mem ory group number will be registered to the

memory channel as follows according to the channel number that users register the group numbers again according to the intended use. To do so, press the [ENT] [MENU] keys while in the Memory Channel mode to enter the Memory Channel List Menu, followed by sele ct i ng [Edit] - [Group] to change the group of the selected channel.

Memory Channel No. Memory Group Group Name

・

400 to 499 Group 4 GRP-4

800 to 899 Group 8 GRP-8 900 to 999 Group 9 GRP-9

Pressing the [MR] key switches to the Memory Channel m ode and activates the "All Groups" state in which all the groups will be recalled at the sam e time. The default setting is "All Groups". To change the memory groups t o recall, press and hold the “◄” or “►” key while in the Memory Channel mode.

The new memory group will be displayed for two (2) seconds when a change has been made, after which only the Memory Channel registered in the memory group can be recalled.

・

・・

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6 Settings & Controls

Indicates the range of Program Scan No. 49.

Group Link Scan 6.9.2 Pressing and holding down the [MHz] key starts Group Link Scan.

Group Link Scan is a feature for scanning only t he m em ory groups registered in the group link via Menu No. 203.

For example, to scan only the amateur radio bands 144 MHz and 430 MHz in the registered name examples given above, both "GRP-0" and "GRP-1" need to be registered in group link.

Program Scan Memory 6.9.3 There are 50 sets (100 channels) of program scan memories for specifying the scan range.

Each program scan memory comprises a set of two (2) channels, each corresponding to the lower and upper frequency limits respectively.

For example, to scan between the range of 145.500 to 145.900 MHz, register 145.500 MHz to channel number "L49" and 145.900 MHz to "U49".

When the frequency enters the program scan range in the VFO mode, the program scan number that is currently applied will be displayed.

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6 Settings & Controls

Bluetooth ON (Bluetooth icon appears)

Bluetooth (connected) icon lights up

6.10 Bluetooth

The TH-D74A/E comes equipped with the Bluet ooth feature that enables wireless connection with other external devices. The Bluetooth specification is Bluetooth 3.0, Class 2. The following 2 profiles are supported.

・HSP (Head Set Profile): Bluetooth communications with an audio device such as a headset. ・SPP (Serial Port Profile): Serial communications over Bluetooth link.

Supported Bluetooth Profile Description 6.10.1

HSP (Head Set Profile) By connecting the TH-D74A/E to a Bluetooth-compatibl e headset device, the microphone and earphone of the headset can be used for ma king voice calls.

PTT on the transceiver unit or speaker microphone is used to start transmissio n. (Transmission cannot be made directly from the Bluetooth headset except for VOX operation. Push-to-talk is not available via the Bluetooth headset.) To adjust the volume level when a Bluetooth device is connected, do so u sing the volume control of the headset. The sensitivity of the microphone can be adjuste d i n

Menu No. 112.

Note: Audi o sound cannot be output from the USB or SP port when a Bluetooth headset is connected. HFP (Hands-Free Profile) is not su pported.

SPP(Serial Port Profile) By pairing the TH-D74A/E with a PC a nd assigning a virtual serial port, it is possible to carry out serial communication with the PC wirelessly. Do ing so enables wireless operation of APRS software programs such as UI-View32 and MCP-D74. Also, serial communication with a PC is possible while a Bluetooth headset is being connected.

During virtual serial communication via Bluetooth, configuration of the baud rate is not necessary to ensure communication at the optim al speed. If it is necessary to configure the baud rate in the PC application program in u se, simply make a random selection from the options given. (Select any one of the opti ons.)

Bluetooth devices that are currently connect ed will appear in Menu No. 933.

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6 Settings & Controls

Audio Output Destination

Speaker Microphone

Nil X n/a X n/a

Speaker Microphone

n/a X X

n/a

Bluetooth

n/a

n/a X USB Audio

X X X

n/a

6.11 USB Usage

Virtual COM Port 6.11.1

The TH-D74A/E supports the USB Communic ations Device Class (CDC), which enables it to communicate with a PC as a virtual C OM port. To make use of the USB virtual COM port, a special driver needs to be installed. The driver may be downloaded from the following website

http://www.kenwood.com/i/products/info/amateur/thd74_vcp_e.html When using the virtual serial communicat i on via USB, configuration of the baud rate is not

necessary. If it is necessary to configure t he baud rate for the PC application program in use, simply make a random selection from the opt ions giv en. The user m ay select any one of the options.

The abovementioned USB feature on the TH-D74A/E enables data loading and writing by the MCP-D74 at a much faster speed Than over Bluetooth.

USB Audio 6.11.2

The USB Audio feature on the TH-D74A/E supports only audio output.

・The output format supported is 48 kHz, 16-bit and monaural audio. ・USB Audi o outputs the same audio sound as the speaker output. ・The output level of USB Audio can be adjusted in ・Audio sound is output from the USB even when a s peaker microphone or earphone is

connected. ・When a Bluetooth headset is connected, USB Audio become s a port used exclusively for

input and output of the Bluetooth headset.

Built-in SP

Connected Device

Menu No. 918.

USB Bluetooth

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6 Settings & Controls

Type

Description

Maximum No. of Files

File Format

Transmitted/Received Audio Recording

Records the communication of data transmitted and received.

255

wav 16 kHz/ 16-bit/ monaural

GPS Tracking Log

Records the GPS tracking data.

255

nme

QSO Log

Records the update history.

4000

tsv (tab-delimited text)

Repeater List

D-STAR repeater list

---

tsv (tab-delimited text)

Callsign List

Callsign list for D-STAR

---

tsv (tab-delimited text)

Captured Image

Screenshot image

---

bmp 240 x 180/ 24-bit

Transceiver Configuration

Information such as the configuration of the transceiver features, as well as memory channels and voice messages.

---

d74 (binary format)

Firmware V1.05 and later versions (255 fil es for V1.04 and earlier versions)

USB Mass Storage Class 6.11.3

This feature is supported on digital cameras and the TH-D74A/E, it allows acce ss to the different settings as well as t he m i croSD memory card on the TH-D74A/E from a PC using the MCP-D74 Memory Control Program by connect i ng the PC to the USB port.

There is no need to remove the memory card from this transceiver. To connect the TH-D74A/E with a PC, it is necessary to install a virtual COM port driver on the PC in advance.

To make use of thi s feature, change the USB device selection option

Menu No. 980 to "Mass Storage".

6.12 microSD Card Usage

Recording Data 6.12.1

The TH-D74A/E is compatible with the microSD an d m i cr oSDHC standards. It supports microSDHC cards with a capacity of up 32 GB.

The following types of information can be rec orded to a microSD card.

(*1)

：

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6 Settings & Controls

（→

）

（→

）

Station List Screen

Press [MENU] to display the list menu (and select Copy to Pos. Memory)

GPS Receiver for Prolonged GPS Logging 6.12.2

Disabling the radio communications feature of the TH-D74A/E allows it to be used for an extended period of time. To do so, configure the "Operating Mode" for GPS to "GPS Receiver".

Menu No. 403

The transceiver feature is disabled in the G P S Receiver mode, but the FM radio feature remains usable.

Menu No. 700）

Saving Configuration Data to microSD Card 6.12.3

The configuration or programming data of the TH-D74A/E can be saved to a microSD card. Export of configuration data

Menu No. 800）

・When upgrading the firmware version, it is recommended that the data be saved to the microSD card.

・The data format is the same as that of the MCP-D74 softwa re. ・To change the confi guration on the TH-D74A/E, it is possible to save the new configuration

data to the microSD card in advance, followed by applying it using the configuration data import feature.

Menu No. 810

Position Memory Usage (GPS) 6.12.4

The TH-D74A/E allows users to register t he positional information of their favorite locations in the Position Memory. The Position Memory feature stores informat i on i ncluding the latitude, longitude, altitude, time of registration, name and icon. Up to 100 sets of i nformation can be stored in the Position Memory. All contents except the time of registration can also be edited.

You can copy information on the current location, APRS station list and My Position to the Position Memory.

<Ways to Utilize Posit i on Memory> ・Applying the Position Memory information to M y Position and sending Position Memory information as object and item ・Target point

To register a Position Mem ory, press and hold the [MARK] key. Registration is not possible if GPS positioning information is not avail able. When GPS positioning data is available, pressing and holding the [MARK] key registers the positional information of the current location to the Position Memory. Let us look at the st eps to register the APRS station list information to the Position Memory. The procedure i s as f ol lows.

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6 Settings & Controls

Select the Position Memory number to copy the information to Memory list

After copying, check the Position Position Memory List (Details) Screen

Station List

Position Memory List

Callsign

Position Name

Radio Station Icon

Icon (same as APRS)

Latitude

Longitude

Altitude

Time Received

Time of Registration

Status Text

Weather Data

Transmission Power

Antenna Height

Antenna Gain

Position Comment

Packet Relay Route

Press [MENU] key to display the list menu (and select “Copy to Pos. Memory”)

Example: Items that are moved when registering information from a station list to the Position Memory list.

→ → → → → →

× × × × × × ×

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6 Settings & Controls

My Position

Position Memory List

Name

Position Name

Icon (same as APRS)

Latitude

Longitude

Altitude

Time of Registration

Position Memory List

My Position

Position Name

Name

Icon (same as APRS)

---

Latitude

Longitude

Altitude

Time of Registration

Position Memory List

Object

Position Name

Name

Icon (same as APRS)

Latitude

Longitude

Altitude

Time of Registration

Example: Items that are copied when registering information from My Position to the Position Memory list.

→

→ → →

Example: Items that are copied when registering information from the Position Memory to My Position.

→

→ → →

Example: Items that are copied when registering information from the Position Memory to Object.

→ → → →

× ×

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6 Settings & Controls

Position Memory Registration 6.12.5

Positional information that has been registered can be copied easily to "My Position" or "Object".

Display the screen containing the details of the P osition Memory to copy.

Press the [A/B] key to select the destination to copy to. Select "My Position" or "APRS Object" as the destination, and press the [A/B] key. Select one of the options from "My Position 1" to "My Position 5" or "Object 1" to

"Object 3", and press the [A/B] key to copy the information. Note: Copying positional information to APRS Object is available from the firmware Version

1.06 or later . The latest firmware can be downloaded from the f ol l owing KENWOOD website.

http://www.kenwood.com/i/products/info/amateur/software_download.html

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7 Appendix

7.1 Exterior views

The pictures below are the TH-D74A, and TH-D74E. The TH-D74A is equipped with a Triband Antenna (144/ 220/ 430 MHz band).

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7 Appendix

7.2 TH-D74A/E Specifications

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TH-D74A/E

Operating Tips

December 1, 2017