LNR Precision LD-5 User guide

LD5 – CW/SSB QRP Transceiver

SDR /DSP

Quick guide manual

Description:

At the development base of the digital signal processing unit, an algorithm is embedded for IQ processing of the channels with phase suppression of the unwanted side-band channel.

Unit CPU \ DSP performs the following functions:

 -------------------------------------------------- ------------------------------ Digital signal processing  Frequency synthesizer  Full control of the transceiver with direct conversion / SDR /

Applicaton:

Due to its small dimensions and light weight this transceiver is suitable for any portable or stationary operation. This unit contains:

 -CPU STM32F407,  -NS -24 bit ADC PCM1803,  -NS -16 bit DAC CS4338 low hissing amp  -HF-generator Si570  -1602-line LCD  -Matrix of buttons  -Encoder

The unit has electronic CW Iambic key, SWR meter and output power wattmeter. Functions that this unit performs are separate and switchable for reception / transmission. They are displayed on the screen display as RX / TX with symbols.

The LD5 is capable of firmware update via USB port. See LNR web page for instructions.

How to order:

LNR Website www.LNRprecision.com

Features

 Emmision Modes: SSB, CW , DIGITAL  5W output power typ.  Very low noise floor due to DDC input stage  The unit has an electronic CW Iambic A/B keyer,

SWR meter and output power wattmeter.

 High stability Si 570 generator  Split-frequency operation  PTT can be switched by connecting PTT to ground  RX/TX switching:

o push PTT input to ground o AF VOX

 Output SWR indicator  Optimal output power indicator  Integrated Sequencer  TX 3 band EQ – presets for bass, middle and treble

boost

Specifications

General

Frequency range

7000 kHz – 22 MHz

40, 30, 20, 17 and 15 meter operation

Modes

USB, LSB, CW, CW-R, DIGITAL

DATA:CAT –USB jack : CW, PSK, RTTY, SSTV – 3.5mm jack

Power

5W output in CW / SSB

Frequency Stability

+/- 3 ppm (Si570 defined) typical

Block diagram

over 0-50 deg C

Supply Voltage

10.5V min to 15V max

350Ma receive and 1.5 to 2 A typical in transmit

Push button operation

LO temp. Stability +/- 2.5

Antenna

50 ohms

BNC

Dual VFO

Memory

100 memory storage per band

Memorize frequency, mode, VFO’s

Built-in speaker

0.2 watts

Dimensions

4.724” long X 3.937” wide x 1.957 “ tall

Weight

19.0oz / 0,54kilogram /excluding microphone/

Iambic key

mode A and mode B

Pitch CW

Controls CW offset. The sidetone pitch is automatically set to equal the offset

Notch Filter

Automatic Heterodyne filter for SSB from -6 to -40 db

Noise reduction

level of attenuation of the noise from 1 to 50- use minimal necessary

Noise Blanker

adjusted in the range from value 4 to 12 readings depending on interference

CW VOX

Break in delay in CW – adjustable from 0.1 seconds to 5 seconds

CW memory keyer

Choose Iambic Mode A or B

VOICE VOX

VOX Delay adjustable from 0.1 seconds to 5 seconds

SSB VOX LEVEL

VOX GAIN 10-100 10 IS MOST SENSITIVE

Filters

8 different filters – 4 of 4 for CW/ SSB - 1-3 factory presets – No.4 adjustable for CW/50-

1000Hz/ and SSB/250-3.6KHz

Compressor SSB

0-20dB

SSB TX MUTE

Enable= no monitor Disable= monitor

Transmitter

Input Power

10.5-13.8 VDC

Output Power

3.5 – 8W

Measurement

SWR and Power in numbers or bar

supply voltage –real voltage on

display

Two modes CW

Select a hand key or a paddle

Receiver

Receive sensitivity

0.2uV

Preamp

Ant Preamp

+12

dB

Spurious response rejection

IMD3 -48Db/ 5W

IMD5 -43dB

ATT

-6 db

Front panel indicators and functions

DESCRIPTION of the command buttons

Command

Meaning

ON/OFF

POWER ON/OFF the transceiver

UP Arrow ↑

Change Band higher 7/10/14/18/21. In Menu mode select next menu item

DOWN Arrow ↓

Change band lower. In menu mode select previous menu item.

MODE

Select CW/ CWR/ LSB/ USB/DIGI

VFO

Select either VFO A or B

STEP

Sequential pressing of the STEP button or the Tuning encoder steps through the tuning rate.

1 bar- 1Hz 2 bars=10Hz 3 bars=100Hz 4 bars=1KHz tuning rate.

LOCK

Lock/unlock the tuning dial ₣ symbol appears to the left of the mode designation on LCD

RIT

Receiver Incremental Tuning. This feature allows changing the frequency of the receiver only without effecting the transmit

frequency. When RIT is activated an * initially appears to the right of the frequency readout. The * indicates that currently,

RIT=0 or RX=TX.

While RIT is activated, tuning the VFO BELOW the current frequency is indicated by a< symbol.

Similarly, tuning above the center frequency results in a > symbol appearing to the right of the display.

RIT remains active until the next ON/OFF power cycle.

PRE/ATT

Sequentially enables preamp (↑) approx. +16dB

Preamp off= No arrow attenuator (↓) approx. -10dB

FILTER

Filter #4 is customizable in CW and SSB. CW from 50Hz 2400Hz SSB from Low end of 250Hz to High end of 3400Hz. CW: Select Filter #4. Press F then Filter. Use the VFO knob to adjust bandwidth SSB: Select Filter #4. Press F then Filter. Use the VFO knob to adjust the low end. Press RIT to adjust the High end. Pressing RIT again will toggle back to low end adjust. Press Filter when complete.

Memory Storage

A total of 100 memories are available. All features (e.g. Mode/NB/NR/Preamp etc) are stored along with the frequency.

To store a frequency in memory, first tune it in using the VFO. Set Mode and any other features you wish to store. Press

MEMO Use the VFO knob to bring up the memory location you wish to store: 0-99

Press the Down Arrow ꜜ

Press MEMO again

Memory Recall

To recall a stored memory channel;

Press MEMO

Use the VFO to dial up the desired memory location

Press the Up arrow ꜛ

Press Memo again

MENU Settings

MENU

Default menu settings

AGC

AGC speed from 1-20. 1 is the slowest and 20 the fastest

PITCH CW

Sidetone and CW offset pitch. Changes take effect when you exit Menu mode

CW SPEED

5 to 60 WPM. Speed change takes effect when you exit Menu mode.

WEIGHT CW KEY

Adjusts the ratio of dash length to dot length:

2> 1; 2.5> 1; 3> 1; 3.5> 1; 4> 1; 4.5> 1 3:1 is standard

CW VOX

Controls break in delay. Steps in 100mSec from 100mSec to 5 seconds

REVERSE CW KEY

Change which side of the paddle is dot and which side is dash.

CW KEY TYPE

Two options: SIMPLE= hand key. AUTO= Paddle.

IAMBIC MODE

Allows user to switch from Iambic mode A to Iambic mode B

NOTCH FILTER

Adjusts notch depth from -6 dB to -40dB Changes can be observed while in Menu mode.

NOISE BLANKER

Adjustable using tuning knob from 4 to 12. 4 is maximum blanking, 12 is minimum. Changes can be heard while in Menu mode.

NOISE REDUCTION

Menu range from 1 to 100 with 1 being the least. If NR is activated from the front panel (F + NR) you can observe the effect

within the Menu.

S-METER MODE

Two modes: Bar Graph or readout in uV.

TX METER

Two options: Bar Graph (Scaler) or Watts (Number)

SHOW TX

Two options: Power in Watts or VSWR

POWER TX

Adjusts power out. Settings from 10 to 100. Typically, a 10 setting is 1W and a 100 setting is 5W

LED MODE

Two options: Forever= LCD backlight always on. Auto= backlight turns on for 3 seconds whenever a front panel switch or encoder

is activated. Backlight off saves 40mA of current drain.

SSB TX MUTE

SSB TX Monitor. Two options: Enable and Disable

SSB COMPRESSOR

SSB Mic compression from 1 to 100.

SSB VOX

adjustment of VOX delay for SSB – DISABLE is off, Adjustable from 100mSec to 5 seconds in 100mSec steps

VOX LEVEL

Adjusts VOX gain in SSB mode.

TX EQ

3 options: Accentuate the Lows, Highs or Midrange. LowF /HiF/ MediumF

GAIN TX DIG

Setting from 1-9.8 using the VFO knob. This function controls the AF Gain in Digital mode

SQUELCH

Settings 0-100. A 0 (zero) setting essentially turns squelch off.

Enter MENU MODE by pressing MENU button and exit the menu mode by pressing the MENU again after set up.

Most of the functions, related to receiving or transmitting, can be changed by values and monitored via monitor in real time.

FUNCION SETTINGS = PUSHING F + :

RIT

On virtual intermediate frequency (VIF) – can be set from the main menu from 5000 to 10000 hertz. Identified as arrows on the upper right corner of the display ->. VIF is working as a main working feature and must be switched on permanently. DIRECT CONVERSION should be used as an option.

On any VFO- when you push RIT an asterisk appears as shown:

When you move frequency up , an arrow will appear to the right:

When you move frequency down , an arrow will appear to the left:

SPLIT OPERATION

SPLIT MODE- if you want to receive on 14020.00 and transmit on 14030.00: SET frequency on VFO A 14020.00 and on VFO B 14030.00 REMEMBER, first VFO chosen is an RX frequency: PUSH RIT button, and then follow RIT MODE :

PUSH VFO A/B until VFO B appears, with reflecting RX frequency arrow to the left

If you switch on TX, the frequency on VFO B will appear – 14030.00

You will notice that VFO A frequency can move up/down, but VFO B is fixed on TX. If you wish to reverse the frequency, exit RIT Mode and switch to VFO B, then push RIT and then VFO A. Notice the arrow shows pointing to the right

On TX you will see this :

MENU

Press (F)unction and then Menu. This changes the 2nd line of the LCD display from S meter reading to monitoring the supply voltage. Pressing (F)unction and Menu again returns to S meter reading.

UP (ꜛ)

Press (F)unction and then ꜛ turns on Noise Reduction at whatever level is preset in the main Menu. The display will show a “R” to the left of the Filter # on the LCD display. Press (F)unction and ꜛagain to turn off Noise Reduction

MODE

Available only in SSB mode. Press (F)unction and then Mode to enable the notch filter at whatever level has been preset in the main Menu. Press (F)unction and then Mode again to turn off the notch filter. The letter “N” will display to the left of the Filter #.

DOWN (ꜜ)

Press (F)unction and then ꜜto turn on the Noise Blanker at whatever level has been preset in the main Menu. The letter “B” will display to

the left of the Filter # on the LCD display

FILTER

Filter #4 is customizable in CW and SSB. CW from 50Hz 2400Hz SSB from Low end of 250Hz to High end of 3400Hz. CW: Select Filter #4. Press F then Filter. Use the VFO knob to adjust bandwidth SSB: Select Filter #4. Press F then Filter. Use the VFO knob to adjust the low end. Press RIT to adjust the High end. Pressing RIT again will toggle back to low end adjust. Press Filter when complete.

SERVICE MODE – It is strongly recommended to contact LNR Support before entering

service mode

Entry into service mode

To enter into default settings – switch OFF the radio and THEN power it up while F button is pressed. RADIO IS READY NOW!!!! Upon entering the service mode, reset all the settings IN DEFAULT EXCEPT “RX IQ”, “TX IQ” and fine tuning of the synthesizer. You should not go to factory settings “RX IQ”, “TX IQ” as they are set individually for your radio and precisely adjusted for values with additional specialized devices, TRANSMITTING and measuring in certain frequency.

Each radio in the service menu is recorded INDIVIDUALY for serial number, factory settings “RX IQ”, “TX IQ” and is hard to adjust if you are not aware of procedure!!!!!!!!!!!

BASIC SETTINGS

F button and then press the MENU button and moving with UP / DOWN and RIT

IF DSP

Virtual gap frequency from 5006 to 10013 Hz / recommended to use a low-frequency virtual

V PWR

Adjustment of the displayed voltage

REF VFO

Correcting the VFO frequency

MULT VFO

Divider VFO. For LD-5 = 4 / do not touch it , it is correct by the service menu/

STARTING FREQUENCY

Low end frequency of selected band; change with tuning knob

END FREQUENCY

High end frequency of selected band; change with tuning knob

S METER

Setting S-METER for the range – calibration

RX IQ

Setting the mirror channel correcting the phase and amplitude of IQ for each band separately on RX “- minimum reading – has two modesfast and slow for quick setting and fine – switched with STEP.

Each transceiver is factory default recorded on the accompanying document

FILTER SSB

Setup filters from 1 to 3 for each type of work. Changing the filter with the push button “Filter”

FILTER CW

Allows user to change the bandwidth of the first three CW filters. While in Service Mode, press Menu. Select Filter 1 CW and redefine the BW with the main tuning knob. Step to the next filter by pressing FILTER etc. Exit Menu mode to save.

AGC DSP

on / off AGC -SHOULD ALWAYS BE SET TO ENABLE

SHOW S METER

Switches S meter

FILTER TX SSB

Adjustment of bandwidth in the transmit mode /FROM 150 Hz to 3600Hz/ -. Changing adjustment of the upper frequency

FILTER TX CW

With the push button “RIT/VIF” adjustment of bandwidth in the transmit mode /FROM 50 Hz to 1000Hz/ - soft CW manipulation 50 – 180 Hz. BELL SOUND

LEVEL TX

Adjustment of Power – entries are shown from “Power TX”- First row on Display: TX ADC indications power “when all bands are equal in power”.

DESCRIPTION of the settings in transmit mode

PWR / VTT

POWER TX

First row on Display: TX ADC indications power for each band separately.

Second row on Display : Power Control for each band separately, shows power of radio on TX – use forward wave of SWR meter

settings are made on a 50 ohms dummy load and SWR = 1, setting indication varies around 100 – 4000

TX IQ

Correcting amplitude and phase balance in IQ channel – in the transmit mode for each band separately

For this purpose we need to have a separate receiver on the frequency and listen to the unwanted side band channel – set on minimal

hearing. Factory setting on all bands is : A 0.0000 F 0,0000

TX EQ

3 band audio presets on transmit only: bass, middle. Treble boost

/ Those settings are directly accessible by pressing MENU /

AGC SPEED

ADJUSTABLE in levels of delay from 1 to 20

PITCH CW

CW tones from 400 to 1000 Hz when crossing the transmit shift to the same tone

NOTCH FILTER

Reject interfering tone only for SSB from -6 to -40 db

NOISE BLANKER

Adjusted in the range from value 4 to 12 - readings depending on interference

NOISE REDUCTION

Level of attenuation of the noise from 1 to 50- use minimal necessary

S-METER MODE

Shows scale bars or S-units in microvolt’s

LED

Backlight brightness of the LCD from 0 to 250

CW SPEED

Regulating the speed of the automatic key from 20 signs to maximum

WEIGHT CW KEY

Dot-dash ratio 2.5> 1 to 4.5> 1 in 0.5

CW VOX

DELAY mode in CW - 100 milliseconds to 5000 milliseconds / 5 seconds /

COMPRESS TX

Compression microphone from 0 to 100%

REVERSE CW KEY

Reversing dot-dash to paddle

TX METER

Shows SWR or power in the transmit mode with bar graph or scale figures

SHOW TX

SWR or power to be displayed in the transmit mode

POWER TX

Regulation in mW from 10% to 100%

LED MODE

Mode for backlight LCD - constant or relight by pressing any button or rotating of tuning knob

SSB MUTE

on / off microphone - MONITOR mode in transmit

DESCRIPTION of the current settings

DIGITAL MODES

IMPORTANT – Make sure to connect the USB, Power Cord and Antenna before powering on the radio.

Then Power ON the Radio. Finally, start up your software program:

In order to operate digital mode or interface with computer, utilize the Line IN/OUT jack and cable. The radio has typical levels for audio signals similar to other amateur radios.

SWR Protection

The radio has a built-in ALC SWR protection - when SWR does not exceed 1:3 – there is no change in output power. But at a greater SWR, the protection gradually lowers the power output, and at SWR = 10 – the output power is only 1%.

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EXPANDED RECEIVE CAPABILITIES

The LD-5 can be set to receive 160M and 80M. At this time, this is for receive only, no TX.

1. Put the LD-5 on 40M.

2. Enter Service Menu

3. Use the UP and DOWN arrow keys to bring up (Begin Frequency 2 Band)

4. Using the VFO knob to tune to 1.8MHz. Pressing the Step button will enable faster QSY.

5. Exit Service mode

6. Use the VFO knob to tune to 7.300MHz and as you go higher the VFO will roll over to 1.8MHz.

7. Select a frequency and mode on 160M and store this frequency into a memory location.

8. Tune up to 80M and do the same for a memory location.

9. Tune to 40M and store a memory location.

When the 40M band is selected with the UP and DOWN arrows, use the Memory function to recall 160, 80 or 40M bands.