ATLAS 210x, 215x User Manual

Receiver Specifications ............................

3 Transmitt er Specifications

Model 200

PS Portable AC Supply .....................

4 Rechargeable Battery pack

Section 2 INSTALLATION ..................................

6 2-1 Introduction

6 2-2 General Information ..............................

6 2-22 Mobile Installations ...............................

9 2-28 Fixed Station Installations ..........................

13 2-29 Antennas

13 2-33 Fixed Station Antennas

Section 3 OPERATION ......................................

15 3-1 Introduction ...................................

15 3-2 Controls ......................................

4 Power Supp ly On/Off, 220

CS/200

PS ..................

5 Function Switch

6 A. F.Gain ... ... ...............................

15 3-7 R. F.Gain .....................................

15 3-8 Band Selector and Tuning Dial, Model 210X ..............

15 3-9 Band Selector and Tuning D ial, Model 215X

11 Carrier Balance

17 3-12 S-Meter Zero ...................................

17 3-13 Crystal Calibrator ................................

17 3-14 Proper tuning od Single Sideband Signals

15 Voice Transmission ...............................

16 Modula tion Level

18 3-17 ALC.........................................

18 3-18 CW Transmission

18 3-19 Heat Sink .....................................

Section 4 CIRCUIT THEORY ................................

20 4-1 Introduction

3 Sensitivity .....................................

20 4-4 Selectivity .....................................

20 4-5 Oscillator Switching ..............................

6 Transmitter Broadband Circuitry

7 Receiver Broadband Circuitry

24 4-8 Alignment and Troubleshooting ......................

24 4-9 Voltage Charts ..................................

24 4-10 Signal Frequency Ranges and Local Oscillator Frequencies .. ...

12 PC-200C — Second I.F. Amplifier, Second Mixer, Mic. Amp.

13 PC-300D

Receiver Audio, Oscillator Switch .............

SWR Protect ...................................

16 PC-600 Carrier Oscillator, Buffer Amplifier .............

36 4-17 PC-800C/1200 Rec e iver Input Tuning ...... ......... ..

Section 1 GENERAL INFORMATION .......................... 1

General Specifications 2

Model 220-CS Power Supply Console Specifications ......... 4

3-3 Power Supply On/Off, Mobile Operation ................. 15

TABLE OF CON TENTS

1-1 Introduction

3-10 Dial Set ....................................... 17

4-2 Receiver Input Circuit 20

4-11 PC-100C - First Mixer/First I.F. Amplifier ............... 26

S-Meter Amp. .................................. 28

4-14 PC-500D/520A - Pre-Am plifier, D river, Power Amplifier,

4-15 PC-400C VFO Board and Tuning Circuits ............... 34

4-18 PC-820 100 kHz Crystal Calibrator ................... 41

2-1 Remote CW Transmit Switch for Atlas Transceivers

......... 8

2-2

Linear Amplifier connections for Atlas Transceivers

......... 10

2-3

Deluxe P lug

In Mobile M ount in g Kit I n stal la ti on

......... 11

2-4

Mobile Bra ck et Kit In sta lla tion ........... ... ... .....

......... 11

2-5

D.C. Power Connections ..........................

......... 12

2-6

Model 220

CS/200

PS Schematic Diagram ...............

......... 14

3-1

Front P an e l of ATLAS 210x ................ ........

......... 16

3-2

Rear Panel of ATLAS 210x/215x ....................

......... 16

4-1

ATLAS 210x/215x Modular Design and Plug

in P.C. Boards . . .

......... 21

4-2

ATLAS 210x /215x Block Diagram ............. ......

......... 22

4-3

Crystal Ladder F ilter Selectivity Characteristics ...........

......... 23

4-4 PC-

100C Schema tic Diagram .... ....................

......... 27

4-5 PC-

200C Schema tic Diagram .... ....................

......... 29

4-6 PC-

300C Schema tic Diagram .... ....................

......... 31

4-7 PC-

500D/520A Schematic Diagr a m ...................

......... 33

4-8A

Model 210x PC

400C Schem atic Diagram ... ......... ...

......... 35

4-8B

Model 215x PC

400C Schem atic (tuning section only) .......

......... 35

4-9 PC-

600 Schematic Diagram .................... .....

......... 37

10A Model 210x PC

800C/1200 Sc li ematic Diagram . ..........

......... 39

10B Model 215x PC

8000/1200 Schematic Diagram ...........

......... 40

4-11 PC-

820 Cryst al C alibrator Schematic Diagram

......... 41

4-12 PC-

9000 Transmitter Input Tun ing Schematic D iagram ......

......... 43

4-13 PC-

1010/1020 low Pass Filter Schematic Diagram .........

......... 45

4-14 PC-

1100A

SWR Bridge, Antenna Relay Scliematic D iagram . . .

......... 46

5-1 PC-

120 Noise Blanker Schematic Diagram ...............

......... 48

5-2

Model l0x Crystal Oscillator ........................

......... 49

5-3

Model 10X Crystal Oscillator Schematic Diagram

......... 50

5-4

Model MT

1 Transformer installation

......... 51

5-5 Model D D

6 Digital D ia l ... ... .....................

......... 52

Section 5

4-19 PC-900C Transmitter Input Tuning .....………………… ………………………............ 42

4-20 PC-1010/1020 Low Pass Filters ......... ......... .…………………………………………… 44

4-21 PC-1100A SWR Bridge , Antenna Rela y ......... .....……………………………………… 46

ACCESSORIES .................................... ………………………………………………………47

5-1 Model PC-120 Noise Blanker ....................... ……………………………………………47

5-2 Model l0x Crystal Oscillator ....................... ……………………………………………...49

5-4 Model VX-5 VOX .............................. ……………………………………………………52

5-5 Model DD-6 Digital Dial .......................... ……………………………………………….52

Figure

1-1 Atlas Model 21 Ox Illustrated with Optional 220-CS AC Console ......... 1

LIST OF ILLUSTRATIONS

5-6 M odel 210x/215x Chassis Wi ri ng ..................... inside back c over

Figure 1-1. Atlas Mo del 210x Il lus tra ted with Optional 220-CS AC Console

SECTION 1 GENERAL

INFORMATION

1-1. INTRODUCTION

The Atlas 210x Transceiver is designed for single sideband and CW communications in the 10, 15, 20, 40, and 80 meter amateur radio bands. The Atlas 215x covers 15, 20, 40, 80, and 160 meters. They employ all solid state circuitry, with modular construction. The conservative 200 watt power input rating will provide world wide communications from fixed, portable or mobile installations.

Atlas Radio, Inc., is licensed by Southcom International, Inc. of Escondido, California, manufacturers of military and commerci al radio equipment. With this agreement. Atlas Radio is able to bring the m ost advanced state-of- theart circuit designs to the amateur radio market. Les Earnshaw, founder and Director of R&D at Southcom International, is considered to be one of the foremost solid state engineers in the world, effectively proved by the rapid growt h o f S outh c o m I nt ernat io nal in the military and com m er cial radio markets o f t he Unit ed States, as well as many other countries.

The hi gh perf orma nce a nd relia bil ity o f the At las tra n sceiv er is en hanc ed by t he fin est cra fts man ship, and a mo st thorough quality control program. Our staff is made up of highly skilled assembly worker s, technicians, and engineers, many of whom are active radio hams. Our service department, if and when needed, is dedicated to making every Atlas owner a satisfied customer. Speaking for all the gang at Atlas Radio, we wish you many hours of opera ting pleasure with your At las tran s c eiver.

73 Herb Johnson W6QKI President

GENERAL SPECIFICATIONS

BAND COVERAGE:

ATLAS 21 Ox: Covers 80, 40, 20, 15, and 10 meter bands, with internal VFO ranges as follows:

3500- 4000kH z

7000- 7500kH z 14000-14500 kH z 21000-21500 kH z

28400 - 29400 kHz

NOTE: The 10 meter band on the 210x may be easily owner adjusted to cover any 1000 kHz portion of the band.

ATLAS 215x: Covers 160, 80, 40, 20, and 15 meter bands, with internal VFO ranges as follows:

1800 2100kHz 3500 4000kHz 7000 7500kHz 14000 14500kHz 21000 21500 kHz

FREQUENCY CONTROL;

Highly stable VFO common to both receive and transmit modes.

13800 14900kHz 20600 21600 kHz

Note: The Model l0x will not oper a te on the 28.0 MHz band.

CIRCUIT DESIGN:

All solid state, 4 IC's, 18 t ransistors, 31 diodes. Single conversion, 5520 kHz I.F.

MODULAR CONSTRUCTION:

Includes plug-in circuit boards for ease of maintenance.

PLUG-IN DESIGN:

Transceiver plugs into the Deluxe Mobile Mounting Bracket, or into the optional 220-CS power supply console, making transfer or removal a simple operation. All connectors are standard: SO-239 antenna jack, 1/4 in. phone jacks for Mic., CW key, external speaker or headphones, and linear amplified control.

FREQUENCY READOUT:

Dial s cale ca librat ed i n 5 kHz i n cremen ts on all band s except 10 meters, where increments are 10 kHz. Tuning knob skirt provides 1 kHz increments on all bands except 10 meters, where increments are 2 kHz.

EXTERNAL FREQUENCY CONTROL:

Rear so cket prov ides for plu g-in of ext ernal VFO or crystal oscillator accessory for separate control of transmit and receive frequencies, or for network and MARS ope ration.

EXTENDED FREQUENCY RANGE WITH CRYSTAL OSCILLATOR:

When the model lOx external crystal oscillator accessory is used, frequency ranges are as listed in the following charts:

1800 - 3000 kHz (Model 215x only) 3000- 5200kH z 5800 - 10000 kHz

POWER SUPPLY REQUIREMENTS

Operates directly from a 12 to 14 volt D.C. source with negative ground (standard automotive system). Current drain is 300 to 500 ma. in receive mode, 16 amps. peak in transmit mode. Atlas model 220-CS power supply console and the model 200-PS portable supply are available for AC operation.

FRONT CONTROLS:

Tuning D ial , D ial S et, Fun cti on S wit ch, Band Swit c h, A.F. Gain, R.F. Gain, Mic Gain, Sideband Selector, Calibrator On-Off, Dial Light Dimmer, ALC Control.

FINISH:

Black vinyl covered aluminum cabinet and bottom cover, anodized aluminum panel.

WEIGHT:

6 Ibs. 14 oz. (3.1 Kg) net , 8 Ibs. 6 oz. (3.8 Kg ) shippi ng weight .

DIMENSIONS:

9'/2 in. (24.1 cm) wide, 3'/2 in (8.9 cm) high, 9Vi in. (24.1 cm) deep overall.

RECEIVER SPECIFICATIONS

CIRCUIT DESIGN: Front end design provides exceptional immunity to overload and cross modulation, matching or out performing the best vacuum tube designs. Signals are converted directly to the 5520 kHz I.F. without preamplification. Converter and product detector are double balanced diode rings. IC's are employed in I.F. and AF stages. SENSITIVITY: Requires less than 0.4 microvolts for a 10 db signal-plus-noise to noise ratio on 160, 80, 40, and 20 meter bands; 0.4 microvolts on 15 meters; and 0.6 microvolts on 10 meters. SELECTIVITY: Crystal Ladder Filter, 8 poles. Bandwidth: 2.7 kHz @ 6 db, 4.3 kHz @60db,9.2kHz@ 120 db!! Ultimate rejection more than 130db!! Shape Factor 1.6.

IMAGE REJECTION: More than 60 db. INTERNAL SPURIOUS: Les s than equivalent 1

microvolt signal. AGC CHACTERISTICS: Audio output constant within 4 db with signal

TRANSMITTER SPECIFICATIONS

CIRCUIT DESIGN : Broadband design eliminates transmitter tuning. Single conversion from I.F. to output frequency produces minimum spurious and mixing products. 2 section low-pass filters on each band provide harmonic suppression equal to commercial standards. Includes ALC and infinite SWR protection. FREQUENCY CONTROL: Internal VFO automatically transmits on exactly the same frequency that is being received. Rear socket provides for plugin of external VFO or crystal oscillator accessory for separate control of transmit and receive frequencies, or for network an d MARS opera tion.

POWER RATING: 200 watts P.E.P. input, and CW input, (with 50 ohm resistive load and 13.6 volt D.C. supply) on 160,80,40,20,and 15 meter bands; 120W on 10 meter ba nd. P ower outpu t: 8 0 mini mum P. E.P. and CW on 160, 80, 40, 20, and 15 meter bands; 50 watts minimum on 10 meter band.

variat ion from 5 microvo lts to more than 3 volts. OVERALL GAIN: Requires less than 1 microvolt

signal for 0.5 watts audio output. (CW carrier, 1000 Hert z h eterdy n e) .

AUDIO FIDELITY: 300 to 3000 Hertz, plus or minus 3 db. INTERNAL SPEAKER: 3 in., 3.2 ohm, .68 oz. magn et. Rear jack permi ts plu g in of ex terna l speaker or headphones. Headphones of 500 to 600 ohms are recommended. Headphones of a higher impedance may be used, but will require a h ig h er A. F. Gain setting. Lower impedance headphones will require a lower A.F. Gain setting. When transceiver is plugged into the AC power supply console, internal speaker is disconnected automatically, and front faci ng sp eaker on consol e be comes operati ve.

METER: Reads "S" units from 1 to 9, plus lOtoSOdb. CALIBRATOR: Provides 100 kHz check po int s for

accura te dial se t ting.

RTTY /SSTV POWER RATING:

Approximately 90 watts P.E.P input (dependent directly on ventilation of heat sink).

EMISSIO N : SSB: Lower sideband on 40, 80, and 160 meters. Upper sideband on 20, 15, and 10 meters with Sideband Selector switch in NORM position. Opposite with switch in OPP position. CW: offset frequency. UNWANTED SIDEBAND: More than 60 db down at 1000 Hert z A F in put.

CARRIER SUPPRESSION: More than

50 db down.

THIRD ORDER DISTORTION:

Approximately 30 db below peak power. HARMONIC OUTPUT: More than 35 db below

peak power.

SUPRIOUS AND IMAGE OUTPUT:

More than 40 db below peak power.

CW KEYING: Manual send-receive.Semi-break-in with CW accessory installed in AC power supply console.

TRANSMIT CONTROL: Press to talk with Mic. button, or manual tr an s mi t with Funct io n S witc h o n front panel. Aut o mati c voic e co ntr ol wh en VO X accessory is installed in AC power supply console.

MICROPHONE: Dynamic or crystal.

MODEL 220-CS POWER SUPPLY

CONSOLE SPECIFICATIONS

INPUT VOLTAGE: 110 or 220 volts AC, 50-60 H z .

INPUT POWER: 10 watts average, receive. 250 watts transmit peak.

OUTPUT: Low current line: 13.6 volt s regulated, Vi amp. High c urrent line: 13 volts at 16 amps.

SPEAKER: 3x5 in. oval, 1.1 oz. magnet, 3.2 ohm voice coil.

FINISH: Textured Vinyl bonded to aluminum, durable and scr a tch resi sta nt.

Plug requirem ent: standa rd % in. diam. 3 circui t phone plug.

AUDIO FIDELITY: 300 to 3000 Hertz, pl us or minus 3 db.

METER: Reads power amplifier collector current, 016 amperes.

LINEAR AMPLIFIER CONTROL:

Rear jack provides for keying of linear, and ALC control fro m lin ear.

PLUG-IN DESIGN: Transcei ver plugs dir ectly int o power supply console, automatically makes connections for antenna and front facing speaker. Mic. jack an d headp h on e jack a re brought out to fro n t panel.

ACCESSORIES: Space under transceiver permits addition of VOX unit. Space in rear permits addition of semi-break-in CW.

DIMENSIONS: 15-1/2 in. (39.4 cm) wide. 5-5/8 in. (14.3 cm) high. 9-1/2 in. (24.1 cm) deep.

WEIGHT: 17 Ibs. (7.7 Kg) less transceiver. 20 Ibs. (9.1 Kg) shippin g w eig ht.

MODEL 200-PS PORTABLE AC SUPPLY

INPUT VOLTAGE: 110 or 220 volts AC, 50-60 Hertz.

INPUT POWER: 10 watts ave rage, receive. 250 wa tts transmit peak.

OUTPUT: L ow current line: 1 3.6 volts regu lated, Vi amp. High current line: 12.5 volts at 16 amps.

INCLUDES: On-Off switch, Fuses, AC cord, and D.C. Cable with conn ector for transceiver.

DIMENSION: 5-1/4 in. (13.3 cm) wide, 3-1/2 in. (8.9 cm) high, 6-1/2 in. (16.5 cm) deep.

WEIGHT: 7 Ibs. 4 oz. (3.3 Kg ) less transceiver. 10 Ibs. (4.5 Kg) ship pi ng wei gh t.

RECHARGEABLE BATTERY P ACK

Globe Ba t ter y Di vi sio n, Gl ob e-U ni on In c., P.O. Box 5 9 1, Mi lwa uk ee, W i s. 53 201 , manu fa ctu res a "G EL -CEL L" rechargeable Battery Pack, Model GC1400 which will operat e the Atlas transcei vers for a number of hours, with operat ing time d eter mined by re ceive-tra nsmit rati o, and modulation l evel. The ba ttery has a n Amphere -Hou r rating of 7.5 A.H. It comes in a simulated leather case with shoulder strap, and includes an AC charger.

Your Atl a s deal er ma y ha ndl e Gl obe pr odu ct s. Al so , it is ant ic ipat e d tha t Atl as Ra di o may ha ve th e GC1 40 0 pack available for Atlas dealers. Otherwise, you may contact Globe directly for reference to a Globe dealer.

SECTION 2

INSTALLATION

2-1. INTRODUCTIO N This secti on pr ovides instructions for mobile, portab le , or fix e d station installations of the

Atlas 210x/215x transc eivers.

22. GENERAL INFORMATION

2-3. D.C. POWER. The Atlas transceiver is designed to operate on a power source of 12-14 volts D.C. Power can be delivered to the transceiver via the Deluxe Mounting Kit (DMK), D.C. Cable (DCC), Cigarette Lighter Cable (CLC), Portable Ba tt ery Pack, 220-CS AC Console, or 200-PS Portable AC Supply. 2-4. AUTOMOTIVE D.C. ELEC TRICAL SYSTEMS. The D.C. electrical systems in automobiles may at times generate high voltage transients (spikes of voltage superimposed on the 12-14 volt D.C. system). These transients may be caused by faulty brushes in the starter motor, alternator or generator, or loose wiring, and can represent a possible hazard to the semiconduct ors in the transcei ver. For this reason, we strongly urge that you read the following note s an d follo w the m car e full y.

(a) Clean the battery terminals and clamps, and tighten the cl amps s e curely . (b) Tighten battery cable terminals where they attach to the engine. (c) Inspe ct batter y cables an d terminals for co rr osion or w ea r . Replac e them if th ey l ook questi onable. (d) Check battery condition frequently, especially when it approaches its warranty age limit. Use a protective

silicone grease on the terminals to inhibit corrosion.

(e) Check the alte r nator and regulator connections for tightness. Check primary ignition wiring, horn wiring,

light s, etc.

(f) Measure the char ging volta ge from t h e alter na t or with the engi ne r unning at abou t twice i d ling speed. Voltage

at the batter y te rminal s s hou ld measu re 13 volts mini mum, 14 .5 volts ma ximum. Co nsult you r a u t o - electri c service shop if correction is required.

2-5. DELUXE MOUNTING KIT (DMK). The Deluxe Mobile Mounting Kit is a plug-in unit designed for easy removal of the Atlas transceivers. All D.C. power connections are made to the DMK and all necessary hook-up cables, including the D.C. battery cable with polarity protection, circuit breaker, and hardware, are part of the kit.

2-6. D.C. CABLE (DCC). The D.C. Cable (DCC) is designed with built-in polarity protection and overload protection. Thi s cable is availabl e from Atlas deal ers and can be used wit h the Mobile Brack et Kit (MBK) or a portable battery pack.

27. CIGARETT E LIGHTER CABLE ( CLC). Th e Cigarette Li ghter Ca ble is d esigned for u se in tho se instances when D.C. pow er is requi r e d, and th e tr anscei v er ha s not been in s t a lled in the auto mo bi l e using t h e D MK or MBK kits. T he cabl e has a spe cial ci gar ette li ghter plug o n one end, and a tran scei ver power pl ug on the ot her . Polar ity and ov erload protection is included wit h t h e ca ble.

2-8. POR TABLE BATTERY PACK . Th e 7.5 ampere hour Portable Battery Pack provides 12 volts D.C. power via portable rechargeable batteries. Connections from the bat tery pa ck to the t ranscei ver are ma de with t he batte ry pack cable. All necessary plugs arc provided.

2-9. 220-CS AC CONSOLE. The 220-CS AC Consoles are available through Atlas dealers, and provide all the D.C. power required for the Atlas transceivers The 220-CS operates from either 110 volts AC or 220 volts AC, selected by changing fuses. A Microphone jack, Headphone jack, and antenna connector are also provided on the console.

2-10. 200-PS PORTABLE A C SUPPLY. The model 200-PS AC Supply is designed for portable and utility servi ce where t h e wei g ht and si ze o f the del ux e AC con sol e i s not de sir ed. It 's co mpa ct si z e and li g ht wei gh t mak e i t id ea l for the traveler, and yet it will do a completely adequate job in full time duty at the home station. It has a slightly small er p ow er tra n sfor m er tha n th e AC co nsol e , whi ch r edu ce s D.C . i nput po wer a bou t 5 per cen t, bu t pea k po wer with voice m odulat ion is t he same as with th e larg er trans form er. Also, t he 2 00 -PS does not c ontain a speake r, so the one built into the transceiver is used. The 200-PS operates on either 110 volts AC or 220 volts AC, selected by chan gi ng fuses. It is anticipated that a pl astic or simulated leather carry ing case will be available from Atlas Radio for the 200-PS supply as well as for the transceiver in the near future.

2-11. TRANSMISSION LINE IMPEDANCE MATCHING. Proper impedance match between the coaxial feedline and the antenna system is considerably more important with the broadbanded solid state amplifier than with tube type transmitters, which generally have a Pi-type matching network. The SWR should be as low as it can be in order to permit full power operation. As SWR increases, power output from the Atlas transceiver decreases approxim ately as indicat ed in the following table.

TABLE 2-1 . S W R V ERSUS OUTPUT

SWR APPROXIMATE

OUTPUT

1.0

100 watts

1.1 98 watts

1.2 95 watts

1.3 90 watts

1.5 80 watts

2.0 50 watts

3.0

20 watts

2-12. AMMETER READINGS. The ammeter on the Atlas transceiver provides an excellent indicator of impedance mat ch. In CW tran smit mode, the Mic . Gain control b ecomes the Carrier Insertion control . With a close match you will be abl e to run the am meter up to 1 2 amps or mor e (with supply voltage of 13.6 VDC or 117/230 VAC).

2-13. INFINITE SWR PROTECTION. T he Atlas tran sceiver has a bu ilt-in refl ecto-meter which automati cally reduc es tran smitter drive a s SWR i ncrease s. Thi s makes t he power transi stors nea rly i mmune t o damage from mismatched loads. 2-14. SWR MEASUREMENTS. A bridge for measuring Standing Wave Ratio (SWR) is very useful and strongly recommended for checking impedance match. Use the follo win g pr oce dur es .

(a) Switch the bridge to "Forward" or "Sensitivity position. (b) Set the sensitivity control on the bridge to maximum clockwise position.

Advance Mic. Gain until meter on bridge reads just full scale. (Mic. Gain is Carrier Insertion control in CW

(e)

mode).

(f)

Swi tc h brid g e to "SWR" or "Reflec ted" position for the S WR read ing.

(g)

Tune the tra nsceiver up and d own in frequency u ntil you locate minimum SW R. This will indicate the resonant frequency of the antenna, and also the SW R at that frequency.

(h)

Switch the transceiver back to REC. mode. See Caution note, next page.

NOTE

High SWR will not damage the Atlas tr ans ceiver. You m ay f eel

free to operate regardless of the SWR. Only power input and output will suffer. Reflected voltag e wi ll n ot c ause damage.

OPERATE TH E TRANSCEIVER IN CW MODE FOR ONL Y SHORT PERIODS 0V TIME, JUST LONG ENOUGH TO MAKE THE SWR MEASUREMENT. CHECK HEAT SINK TEMPERATURE DURING SWR TESTS, AND IE IT IS GETTING QUITE WARM TO THE TOUCH, LET THE RIG COOL FOR A FEW MINUTES BEFORE CONTINUING.

2-15. MICROPHONE CONNECTIONS. The microphone may be either a dynamic or crystal type. A low impedance Mic. will work, but will require higher setting of the Mic. Gain control, and may require closer speaking. If a dyna mic Mi c. is s elect ed, i t sh ould prefer abl y be t he hi gh imp edan ce t ype. The ch oice of mi crop hone s is i mpor tant for good speech quality, and deserves careful consideration. Select a high quality Mic. with smooth response from 300 to 3000 Hertz or more. An excellent choice is the Shure 404C hand Mic. The plug required for the Mic. connector is a standard 1/4 inch diameter, 3 conductor type. The tip connection is the keying circuit for press-to-talk, the ring conn ection is for the shielded Mic. lead, and th e sleeve or b arrel is the com mon ground terminal .

216. VOICE OPERATED TRANSMISSION (VOX). Most press-to talk microphones arc short circuited when the button is not pressed, if the VOX accessory is installed in the AC console, this feature must be disabled. Refer to instru ct i on s tha t com e wi th th e Mi c. Ope n th e cas e and lo ca te t he s wit ch c ont a ct s that shor t th e Mic c ir cui t wh en t he button is not pressed, either disconnect the leads, or bend the contact so they do not make.

2-17. CW KEY. A jack on back of the transceiver is provided for insertion of a standard 1/4 inch diameter 2 conductor phone plug. Connect the CW key to this plug with a 2 conductor cable. The sleeve connection goes to chassis grou nd. Keyi ng potential is less than 10 volts, positive, and dra ws less than 5 milliampères. Any of the electronic keyers presently on the market will operate satisfactorily.

2-18. REMOTE CW TRANSMIT SWITCH FOR ATLAS TRANSCEIVERS.

The Atlas tran sc eiv er s hav e a fu nction switch which pr o vi des f or switching into the C W T r ansmit m ode. H o w ever , it requires switching from the RLC. to TRANS., and then to the CW position. This procedure is rather awkward, and the circuit shown below (Figure 2-1) provides a more convenient system.

CAUTION

Figure 2-1. Remote CW Transmit Switch for ATLAS Transceivers

The remote switch can be a double pole, single throw toggle switch, and may be installed on a bracket or in a small utility box alon g with th e two diod es. Oth er parts requ ire d are two phon e plu gs, a 9 pin Noval p lug, a 4 conduct or cable, and a single insulated conductor.

The remote switch unit may be secured near the CW key, or possibly attached to one side of the key base, permitting quick and easy switching to the CW Tra n smit mo d e.

Operatio n of the circuit is as follows: When the switch is closed, the single conductor wire coming from the MicJack is grounded through the 1N4005 diode, a nd th e swi t ch to pi n 4 or th e E XT . OS C. socket. T hi s causes t he r el ays in t he t ra n sce iver to cl o se, plac in g the transceiver in transmit mode. At the same time, the lead coming from pin 9 is grounded through the 1N4148 diode, thus disabling the Mic. Amp., and preventing voice modulation of the CW signal.

The other circuit of the 2 pole switch connects the +13 volt line from pin 8 to the +CW lead going to pin 1 of the EXT. OSC. socket. This causes the carrier oscillator frequency (NORM. SB only) to move about 800 cycles up into the filter passband, thus providing automatic off-set frequency during CW transmission.

2-19. EXTERNAL OSCILLATOR SOCKET. This socket is a 9 pin Noval installed on the back of the transcei ver, and is for plug in of the Atlas Model lOx Crystal Oscill ator accessory, Model 206 External VF O , or the Model DD-6B-C Digital Dials. Jumper wires are factory installed on this socket, and must be removed if any of these accessories are to be used. 2- 20. AUXILIARY SOCKE T. This so cket is also a 9 pin Nov al, and is for control of a Linear Amplifier or VX-5 or VX-5M CW Semi-breakin.

2-21. LINEAR AMPLIFIER CONNECTIONS. Figure 2-2 illu strates h ow to connect a l inear ampli fier to the Atlas transceivers. ALC output from the linear may be connected to Pin 4 on the AUX. socket plug. The ALC control voltage from the linear MUST b e positive going. Most linears with an ALC output circuit ar e negative going. If this is th e case with your li near , and you wi sh to utili ze ALC cont rol from t he linear, it will be nece ssar y that you modify the linear ALC circuit. This will usually consist of reversing one or two diodes in order to generate a positive volta g e c ontrol in stead of ne ga tive.

In view of this requireme nt, you may choose to use the ALC system of the Atlas tra nsceiver alone. Mos t linears will operate to the full legal power limit with little or no distortion.

2-22. MOBILE INSTALLATIONS 2-23. DELUXE PLUG-IN MOBILE MOUNTING KIT. This kit includes :

(a) 6'/2 foot D.C. power cable; (b) 25 Amp. Circuit Breaker; (c) Black anodized aluminum plug-in housing; (d) Two 9-inch and two 12-inch cadmium plated steel mounting bars; (e) 3 inch wide rear bracket; (f) Package of screws and terminal lugs. Refer to Figure 2-3 for typical transmission hump and under dash mounting arrangements.

1. The r ear br a cke t( s)) s hou ld be a ngl ed a s stra i ght ba ck as p os sibl e in or der to gi ve g ood sup por t for pu shi ng and pulling the transceiver in and out of the mount.

2. The mounting brackets must be cut and bent to suit the installation, each being unique. Try different positioning and select the o ne for best ease of op eration, and l east interferen ce with automo bile controls. T hen carefully measur e ea ch brack et for l ength and a ngl e of ben d on it s t oot. Ben d as r equir ed. After be nding the bra cket s, they may be painted with flat black to match the anodized aluminum parts, if desired.

3. Remove the acorn nut and hex nut. Sl ip bracket over screw, and replace only the acorn nut.

4. Secure brackets to car with No. 14 sheet metal screws. Tighten screws and nuts securely. No. 10 screws are also furnished in case the No. 14 screws are too large.

5. Antenna connection is made by standard coax connector to the coax jack on the rear of the Deluxe Mounting Kit.

6. An e xternal s peaker may be co nnecte d a s f ol lows: L ocate the speaker plug on the back o f t he mobile moun t, just above the Mic. plug. Clip out the wire jumper g oing from the ti p lug to the ring lug . This will disc onnect the internal speak er. Connect the ext ern a l speak er from t h e tip lug to the ground lug. Impedance should be 4 ohms.

7. Black anodizing provides a very durable finish, much better than paint. However, the ano-dized surface is an

electr ical in sulati on. I n ord er to en sur e ele ctrica l bo ndi ng bet ween t he tra ns ceiv er and t he ca r cha ssi s, shak epr oof washers must be used under all screw heads. They will cut through the anodizing. Scraping the an odizing off aroun d the juncti on poi nts on the r ear brack et(s) is al so reco mmended. Poor grou nding may l ead to tra nsmitt er instability, which will cause a regenerative or self oscillating condition. If there is any question of adequate grounding, connect a copper braid or strap from the antenna bracket on the mobile mount to the nearest chassis ground, eith er t h e bulkhea d or transmi s sion hump.

8. T he power cable s hould b e run fr om the mobil e mount t hroug h the bu lkhea d into t he eng ine com part ment. I t should then be connected to the positive and negative terminals as close to the battery as possible. The best way to conn ect dir ec tl y to t he ba tt er y ter mi nal po sts i s b y dri lli ng a nd ta pp in g fo r a 1 0 -32 or 10 -24 mach in e sc rew . The red lead goes to the positive terminal, and the brown to the negative. (Or the white is positive and the black is negative.)

9. The 25 ampere circuit breaker supplied with the kit should be installed in series with the positive lead. It is best to mount it clo se to the battery en d of the cable, at so me convenient place o n the side of a metal pan el or bracket. She et metal scre ws are supplie d for this purpo se. It is not imp ortant that th e metal case o f the circuit breaker be grounded, since there are no connections made to the case. Cut the positive red power lead, install No. 10 terminal lugs, and secure firmly to the circuit breaker with washers and nuts. Solder the terminal lugs.

The advant age of connecting directly to the battery posts is that loose battery clamps will then not a ffect the

NOTICE

transcei ver connections, and the danger of intermitten t voltage spikes is reduced. If drilling and tapping the b att ery posts is not practi cal, then co nn e ct the lea d s to the engi ne end of the hea vy b a tter y cables. The negative cabl e will usually be found going to a grounding bolt on the engine bloc k, and the positive cable usually goes to a bolt on the starter solenoid. Use proper terminal lugs at these points for connecting the leads. Battery clamps and terminals shoul d b e cleane d a nd ti ghtene d periodica l ly. Anti-corrosion gr ease is a good recom m e ndation. All oth er electr ica l connect ions under the hoo d: alternator, regulator, ignition coil,etc. ,should also be checked and tighte ned.

Figure 2-2. Linear Amplifier Connections to ATLAS Transceiver

Figure 2-3. Deluxe Plug-in Mobile Mounting Kit Installation

2-24. MOBILE BRACKET KIT (MBK). This kit includes: One 9-inch and two 12-inch cadmium plated steel mounting bars with scr ews. Figur e 2-4 illustrat es how the trans ceiver can be hun g under the dash, or mounte d over the transmis sion hump. Each in stallation is different, so thi s must be left to the individua l. Consult your dealer or friends with mobile experience if need be. The brackets can be cut easily and bent as required. The smaller No. 6x3/4 inch s crews are for at t a c hing the brack ets to the sides or bottom of the t r anscei ver. Th e y will re pl ace the No. 4x1/4 inch screws that came in the transceiver, thus allowing for the 1/8 inch thickness of the bracket. The No. 6 scre ws wi ll ma ke t he br a cke t s mor e se cur e tha n the or igi na l No. 4's woul d. T he No. 14 s cr ew s are f or s ecu rin g th e brackets to the under side of the dash, or to the transmission hump. No. 10 screws are also furnished in case the No. 14 screws are too large.

Figure 2-4. Mobile Bracket Kit Installation

2-25. INSTALLING D.C. POWER CABLE. The power cable should be run from the transceiver, through the bulkhead, and connected as close to the battery as is practical. The best way is to connect directly to the battery posts. Drill and tap into the lead terminal posts for 10-32 machine screws, and secure No. 10 terminal lugs under these screw heads. The advant age of doing this is that even if th e battery clamps work loose, it will no t

affect the transceiver connections, and the danger of intermittant transient voltage spikes will be reduced. If drill ing and tapp ing the batt ery posts i s not practi cal, then co nnect the lea ds to the eng ine end of th e battery cables. The negative cable will usually be found going to a bolt on the engine block, while the positive cable usually goe s to a bolt on th e start er sole n oid. U se pr op er ter m inal lu g s at the s e poi nt s for co nne cti ng th e l ead s. T he red lead goes to positive and the brown lead to negative. (If power cable has black and white leads, the black is negative, and the white is positive). A protective diode is built into the transceiver plug, and will open if polarity is inadvertantly connected wrong. As discussed in paragraph 2-4, the battery clamps should be cleaned and tightened. All electrical connections should likewise be checked and tightened.

2-26 INSTALLATION OF 25 AMP CIRCUIT BREAKER. The 25 ampere circuit breaker supplied with the kit should be installed in series with the positive lead. It is best to mount it close to the battery end of the cable, at some convenient place on the side of a metal panel or bracket. Short metal screws are supplied for this purpose. It is not important that the metal case of the circuit breaker be grounded, since there are no connections made to the case. Cut th e positive red ( or white) po wer lead, install N o. 10 terminal lugs, and secur e firmly to t he circuit breaker with wa sh er s and nu t s. Sold er the ter mi nal lu g s. 2-27. OTHER D.C. INSTALLATIONS. In the event that you have not pur chased the DMK, MBK, or DCC kit s, your t ran s cei ver co me s wit h t wo banana ja ck s fo r t he pos i tiv e ba tt ery lea d, and a r e to b e co nne ct ed i n para ll el a s shown in Figure 2-5. The banana plu g connect s to the ne ga tive ba ttery lead. The ba ttery l eads sh ou ld be o f No . 1 0 or No. 12 gauge stranded wire of the automotive type. A 20 amp. fuse or circuit breaker should be installed in the positive lead. Figu r e 2 -5 illustrates the proper co nn e ctio n s requi re d bet we en the batt er y and th e Atlas transceiver.

POLARITY BE O BS ERVED. THE POSITI VE BATTERY LEAD MUST GO TO THE TWO TER MINALS CLEARL Y MARKED ON BACK OF THE TRANSCEIVER. THE NEGATIVE BATTERY LEAD MUST GO TO THE TRANSCEIVER CH AS S IS GROUN D, AND THE BANANA PLUG IS FOR THIS PURPO SE. EVEN MOMENTAR Y CONNECTION O F THE WRONG POL ARITY WILL DESTROY THE TRANSIS TORS, AND VOID THE ATLAS WARRANTY.

CAUTION IT IS EXTREMELY IMPORTANT THAT PROPER

Figure 2-5. D.C. Power Connections

2-28. FIXED STATION INSTALLATIONS

In fixed station installations, the use of the 220-CS eliminates the necessity for making D.C. power connections. The only requirement is that the A tl as Transceiver be f irmly seated in the console. When instal ling the transceiver in the console, a lways mak e sure that the unit i s pushed all t he way into th e console. This will insure that all power, Mic, and speaker connections are firmly made.

2-29. ANTENNAS

2-30. MOBILE ANTENNAS. The mobile antenna generally requires more critical adjustment than the home station antenna. This is because it operates over a more narrow bandwidth, and must therefore be adjusted very accurately for resonance. Also, the base impedance is seldom very close to 52 ohms. With the tube type transmitters the Pi matching network will adjust to fairly low impedances, but with a broadband solid state transmitter, such as is used in the Atlas transceivers, a close impedance match is necessary in order to operate at full power. Various claims about im p eda nce ar e ma de b y manu fa c tu rers o f mob il e ante nna s, but un for tu na tel y our test s on all the mo st p opul ar brands indicate that your chances of coming up with a close match are less than 1 to 10. Average base impedance is 18 to 2 3 ohm s. Ther efor e, som e meth od o f tran sfor ming t he ant enn a base i mpe danc e to 52 ohms i s requir ed. ( See Section 5-3 for Model MT-1 Broadband Transformer.)

2-31.CAPACITYMATCHINGMETHOD.This is one method for impedance matching to the mobile antenna which works quite well. A capacitor is connected from the antenna base to ground. This capcitor is part of an L network which transforms the base impedance from a low value up to 52 ohms. The small amount of "1" required is actually "borro wed" from th e lower part of the loading coil. Th e capacity va lue must be deter mined exp erime ntally, and will vary from band to band, as well as from installation to installation. On 75 meters, t he ca pa city w ill g enera ll y nee d t o be i n t h e 1000 to 1500 picofarad range. On 40 meters, 300 to 400 picofarads and on 20 meters about 200 picofarads. A variable capacitor can be useful to determine what value is required or a collection of silver mica capacitors, some 100 pf's, 200's, 470's, and a 1000 pf can be paralleled in various combinations until the SWR comes down to a low figure. Once you know how much capacity your antenna needs, it is best to make up the perman ent capacitor by parallel ing two or more silver micas. This will di vide the R.F. curre nt a nd r edu c e the cha n ce s of ov er h eati ng a si ngl e ca pa ci tor wit h t oo mu ch cu rr ent . Fo ll ow t he pr o cedu r e described in paragraph 2-14 when tuning the antenna.

2-32 . NOISE SUPP RESSIO N. The s ubject o f noise s uppress ing auto motive ignitio n and alte rnator noise is beyond the scope of this manual, so it will only be mentioned briefly. Many cars will create very little interference in the IIF bands covered by the Atlas transceiver. Almost all cars now use resistance type ignition wire, and will probabl y create very little ignition noise. More likely the high pitched whine from the alternator will cause more trouble. Refer to the various amateur radio handbooks available from your dealer for information o n noise su ppressio n. It will usually be f ound in the mo bile sections . Estes Engineer ing Co., 930 Marine Dr., Port Angeles, Wash. 98362, manufactures an excellent line of suppression kits which can help cure the more st ubborn cases. It is quite likely that your dealer sells the Estes Engineering lin e also.

IMPORTANT : Ma k e sur e that the tra n sc eiv er m ounti n g brackets are well groun ded to the tra n smi ssi on hu mp or bulkhead.

2.33. FIXED STATION ANTENNAS

On 10, 15, and 20 meters a doublet and most beam antennas will match quite well across the entire band. On 40 meters a doublet tuned for phone band center will match quite well across the band. On 75 meters the average doublet will have a bandwidth of about 100 kc for SWR of 1.5 or less. To work the entire band with full efficiency will require an antenna tuner. On 160 meters an antenna tuner, or at least some kind of matching system will be essential, since even at resonance it is unlikely that the feed point will be near 52 ohms. In any case, it is always best to optimize the antenna system for the frequency where you do most of your operating.

2.34. ANTENNA TUNER OR. "MATCH BOX." An antenna tuner can be a very useful device to compensate for antenna mismatch. This may be especially true if you happen to have a favorite antenna that has been working just fine with th e ol d tub e ri g, an d now you di sc ov er t he new so lid st at e ri g d o esn 't li k e t he ol d an ten na . R efer to th e antenna handbooks for helpful data, or as k your dealer abo ut antenna tuners now on the market.

Figure 2-6. Model 220-CS/200-PS Schematic

SECTION 3

OPERATION

3-1. INTRODUCTION

This section provided instructions for operating the ATLAS 210x/215x transceiver and identifies operating contr ols, i ndica tor s, and con nectio ns. Front panel cont rols a nd in dicat ors a re sh own an d de scribe d in Fi gure 3 -1. Rear panel controls and connections are shown and described in Figure 3-2.

3-2. CONTROLS 3-3. POWER SUPPLY ON/OFF, MOBILE OPERATION

The Function S witch has an OFF position which tu rns off the DC supply to the low current circuits. The high current cir cuits (Driver and Power Amplifier) remain connecte d to the DC sup ply line, but are au tomatically biased off when the low current line is turned off.

3-4. POWER SUPPLY ON/OFF, 220-CS/200PS.

The 220-CS/200-PS supplies have an ON/OFF toggle switch which turns off the AC supply line. This switch should be used rath er tha n th e Fun ctio n S wit ch OFF p o sitio n.

3-5. FUNCTION SWITCH

The first position is the OFF position and is used for mobile operation. The REC. position places the transceiver in receive mode. Press-to-talk and VOX circuits are operative in this position. TRANS position switches the transceiver into transmit mode in the event a Mic. without a press-to-talk switch is used, or if you wish to hold-in transmit mod e with out having to hold the push -t o -talk bu tt o n down. Th e CW posi ti on is also tran sm it mo de exc ept that the Mic. Gain control now becomes a Carrier Insertion control and carrier frequency has been shifted about 800 Hertz. (S ee C W Transmission)

3-6. A. F. GAIN The A. F. GAIN control is used to control audio volume in receive mode.

3-7. R. F. GAIN

The purpose of the R.F. Gain control is to permit decreasing the between speech noise level, thus providing more pleasing reception. The AGC system in the ATLAS transceiver has a tremendous dynamic signal range. With full R.F. Gain, sensitivity will automatically return to maximum in the absence of a signal, accompanied by a natural incr ea s e i n ba ckground nois e.

You may find it annoying to hear the noise level increase every time the person being received pauses between words or sentences. There are really only two conditions when the R.F. Gain control needs to be on full. One is when you are scanning the band and want to hear weak as well as strong signals. But, a lot of the time you can turn the R.F. Gain down a bit, incre as e the A.F. Gain correspondingly, and re alize more pleasing reception.

3-8. BAND SELECTOR AND TUNING DIAL, MODEL 21 Ox

The numbers on the band selector read in MegaHertz for the respective bands: 3.5 for the 80 meter band, 7.0 for 40 meters, etc.

+ 40 hidden pages