Atlas 210x Installation and operating instructions

TABLE OF CONTENTS
Section 1 GENERAL INFORMATION .......................... 1
1-1 Introduction 1
General Specifications 2
Receiver Specifications ............................
3
Transmitter Specifications
3
Model 220-CS Power Supply Console Specifications ......... 4
Model 200
-
PS Portable AC Supply .....................
4
Rechargeable Battery pack
5
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
14
Section 3 OPERATION ......................................
15
3
-
1 Introduction ...................................
15
3
-
2 Controls ......................................
15
3-3 Power Supply On/Off, Mobile Operation ................. 15
3
-
4 Power Supply On/Off, 220
-
CS/200
-
PS ..................
15
3
-
5 Function Switch
15
3
-
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 Dial, Model 215X
17
3-10 Dial Set ....................................... 17
3
-
11 Carrier Balance
17
3
-
12 S
-
Meter Zero ...................................
17
3
-
13 Crystal Calibrator ................................
17
3
-
14 Proper tuning od Single Sideband Signals
17
3
-
15 Voice Transmission ...............................
17
3
-
16 Modulation Level
18
3
-
17 ALC.........................................
18
3
-
18 CW Transmission
18
3
-
19 Heat Sink .....................................
18
Section 4 CIRCUIT THEORY ................................
20
4
-
1 Introduction
20
4-2 Receiver Input Circuit 20
4
-
3 Sensitivity .....................................
20
4
-
4 Selectivity .....................................
20
4
-
5 Oscillator Switching ..............................
20
4
-
6 Transmitter Broadband Circuitry
24
4
-
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 .....
25
4-11 PC-100C - First Mixer/First I.F. Amplifier ............... 26
4
-
12 PC
-
200C
—
Second I.F. Amplifier, Second Mixer, Mic. Amp.
S-Meter Amp. .................................. 28
4
-
13 PC
-
300D
-
Receiver Audio, Oscillator Switch .............
30
4-14 PC-500D/520A - Pre-Amplifier, Driver, Power Amplifier,
SWR Protect ...................................
32
4-15 PC-400C VFO Board and Tuning Circuits ............... 34
4
-
16 PC
-
600 Carrier Oscillator, Buffer Amplifier .............
36
4
-
17 PC
-
800C/1200 Receiver Input Tuning .................
38
4-18 PC-820 100 kHz Crystal Calibrator ................... 41

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 Relay ..............……………………………………… 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
LIST OF ILLUSTRATIONS
Figure
1-1 Atlas Model 21 Ox Illustrated with Optional 220-CS AC Console ......... 1
2
-
1
Remote CW Transmit Switch for Atlas Transceivers
......... 8
2
-
2
Linear Amplifier connections for Atlas Transceivers
......... 10
2
-
3
Deluxe Plug
-
In Mobile Mounting Kit Installation
......... 11
2
-
4
Mobile Bracket Kit Installation ......................
......... 11
2
-
5
D.C. Power Connections ..........................
......... 12
2
-
6
Model 220
-
CS/200
-
PS Schematic Diagram ...............
......... 14
3
-
1
Front Panel 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 Filter Selectivity Characteristics ...........
......... 23
4
-
4
PC
-
100C Schematic Diagram ........................
......... 27
4
-
5
PC
-
200C Schematic Diagram ........................
......... 29
4
-
6
PC
-
300C Schematic Diagram ........................
......... 31
4
-
7
PC
-
500D/520A Schematic Diagram ...................
......... 33
4
-
8A
Model 210x PC
-
400C Schematic Diagram ...............
......... 35
4
-
8B
Model 215x PC
-
400C Schematic (tuning section only) .......
......... 35
4
-
9
PC
-
600 Schematic Diagram .........................
......... 37
4
-
10A
Model 210x PC
-
800C/1200 Scliematic Diagram ...........
......... 39
4
-
10B
Model 215x PC
-
8000/1200 Schematic Diagram ...........
......... 40
4
-
11
PC
-
820 Crystal Calibrator Schematic Diagram
......... 41
4
-
12
PC
-
9000 Transmitter Input Tuning Schematic Diagram ......
......... 43
4
-
13
PC
-
1010/1020 low Pass Filter Schematic Diagram .........
......... 45
4
-
14
PC
-
1100A
SWR Bridge, Antenna Relay Scliematic Diagram . . .
......... 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 DD
-
6 Digital Dial ...........................
......... 52
5-6 Model 210x/215x Chassis Wiring ..................... inside back cover

Figure 1-1. Atlas Model 210x Illustrated 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 commercial radio equipment. With this agreement. Atlas Radio is able to bring the most advanced state-of-the-
art 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 growth of Southcom International in the military and commercial radio markets of the United States, as well
as many other countries.
The high performance and reliability of the Atlas transceiver is enhanced by the finest craftsmanship, and a most
thorough quality control program. Our staff is made up of highly skilled assembly workers, 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 operating pleasure with your Atlas transceiver.
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- 4000kHz
7000- 7500kHz
14000-14500 kHz
21000-21500 kHz
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 receiveand
transmit modes.
FREQUENCY READOUT:
Dial scale calibrated in 5 kHz increments on all bands
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 socket provides for plug-in of external VFO or
crystal oscillator accessory for separate control of
transmit and receive frequencies, or for network and
MARS operation.
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- 5200kHz
5800 - 10000 kHz
13800 14900kHz
20600 21600 kHz
Note: The Model l0x will not operate on the 28.0
MHz band.
CIRCUIT DESIGN:
All solid state, 4 IC's, 18 transistors, 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.
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 Dial, Dial Set, Function Switch, Band Switch,
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)
shipping weight.
DIMENSIONS:
9'/2 in. (24.1 cm) wide, 3'/2 in (8.9 cm) high, 9Vi in.
(24.1 cm) deep overall.
2

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. Con-
verter 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: Less than equivalent 1
microvolt signal. AGC CHACTERISTICS: Audio
output constant within 4 db with signal
variation from 5 microvolts to more than 3 volts.
OVERALL GAIN: Requires less than 1 microvolt
signal for 0.5 watts audio output. (CW carrier, 1000
Hertz heterdyne).
AUDIO FIDELITY: 300 to 3000 Hertz, plus or
minus 3 db. INTERNAL SPEAKER: 3 in., 3.2 ohm,
.68 oz. magnet. Rear jack permits plug in of external
speaker or headphones. Headphones of 500 to 600
ohms are recommended. Headphones of a higher
impedance may be used, but will require a higher 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
facing speaker on console becomes operative.
METER: Reads "S" units from 1 to 9, plus lOtoSOdb.
CALIBRATOR: Provides 100 kHz check points for
accurate dial setting.
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 plug-
in of external VFO or crystal oscillator accessory for
separate control of transmit and receive frequencies,
or for network and MARS operation.
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 band. Power output: 80 minimum P.E.P.
and CW on 160, 80, 40, 20, and 15 meter bands; 50
watts minimum on 10 meter band.
RTTY /SSTV POWER RATING:
Approximately 90 watts P.E.P input (dependent
directly on ventilation of heat sink).
EMISSION : 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 Hertz AF input.
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 transmit with Function Switch on
front panel. Automatic voice control when VOX
accessory is installed in AC power supply console.
MICROPHONE: Dynamic or crystal.
Plug requirement: standard % in. diam. 3 circuit
phone plug.
AUDIO FIDELITY: 300 to 3000 Hertz, plus or minus
3 db.
METER: Reads power amplifier collector current, 0-
16 amperes.
LINEAR AMPLIFIER CONTROL:
Rear jack provides for keying of linear, and ALC
control from linear.
MODEL 220-CS POWER SUPPLY
CONSOLE SPECIFICATIONS
INPUT VOLTAGE: 110 or 220 volts AC, 50-60 Hz.
INPUT POWER: 10 watts average, receive. 250
watts transmit peak.
OUTPUT: Low current line: 13.6 volts regulated, Vi
amp. High current 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 scratch resistant.
PLUG-IN DESIGN: Transceiver plugs directly into
power supply console, automatically makes
connections for antenna and front facing speaker.
Mic. jack and headphone jack are brought out to front
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) shipping weight.
MODEL 200-PS PORTABLE AC SUPPLY
INPUT VOLTAGE: 110 or 220 volts
AC, 50-60 Hertz.
INPUT POWER: 10 watts average, receive. 250 watts
transmit peak.
OUTPUT: Low current line: 13.6 volts regulated, Vi
amp. High current line: 12.5 volts at 16 amps.
INCLUDES: On-Off switch, Fuses, AC cord, and
D.C. Cable with connector 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) shipping weight.

RECHARGEABLE BATTERY PACK
Globe Battery Division, Globe-Union Inc., P.O. Box 591, Milwaukee, Wis. 53201, manufactures a "GEL-CELL"
rechargeable Battery Pack, Model GC1400 which will operate the Atlas transceivers for a number of hours, with
operating time determined by receive-transmit ratio, and modulation level. The battery has an Amphere-Hour
rating of 7.5 A.H. It comes in a simulated leather case with shoulder strap, and includes an AC charger.
Your Atlas dealer may handle Globe products. Also, it is anticipated that Atlas Radio may have the GC1400 pack
available for Atlas dealers. Otherwise, you may contact Globe directly for reference to a Globe dealer.

SECTION 2
INSTALLATION
2-1. INTRODUCTION This section provides instructions for mobile, portable, or fixed station
installations of the
Atlas 210x/215x transceivers.
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 Battery Pack, 220-CS AC Console, or 200-PS Portable AC Supply.
2-4. AUTOMOTIVE D.C. ELECTRICAL 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 semiconductors in the transceiver. For this reason, we strongly urge that you read the
following notes and follow them carefully.
(a) Clean the battery terminals and clamps, and tighten the clamps securely.
(b) Tighten battery cable terminals where they attach to the engine.
(c) Inspect battery cables and terminals for corrosion or wear. Replace them if they look questionable.
(d) Check battery condition frequently, especially when it approachesits warranty age limit. Use a protective
silicone grease onthe terminals to inhibit corrosion.
(e) Check the alternator and regulator connections for tightness. Check primary ignition wiring, horn wiring,
lights, etc.
(f) Measure the charging voltage from the alternator with the engine running at about twice idling speed. Voltage
at the battery terminals should measure 13 volts minimum, 14.5 volts maximum. Consult your auto-electric
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. This cable is available from Atlas dealers and can be used with the Mobile Bracket Kit (MBK) or a
portable battery pack.
27. CIGARETTE LIGHTER CABLE (CLC). The Cigarette Lighter Cable is designed for use in those instances
when D.C. power is required, and the transceiver has not been installed in the automobile using the DMK or MBK
kits. The cable has a special cigarette lighter plug on one end, and a transceiver power plug on the other. Polarity
and overload protection is included with the cable.
2-8. PORTABLE BATTERY PACK. The 7.5 ampere hour Portable Battery Pack provides 12 volts D.C. power via
portable rechargeable batteries. Connections from the battery pack to the transceiver are made with the battery
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 AC SUPPLY. The model 200-PS AC Supply is designed for portable and utility service
where the weight and size of the deluxe AC console is not desired. It's compact size and lightweight make it ideal
for the traveler, and yet it will do a completely adequate job in full time duty at the home station. It has a slightly
smaller power transformer than the AC console, which reduces D.C. input power about 5 percent, but peak power
with voice modulation is the same as with the larger transformer. Also, the 200-PS does not contain a speaker, so
the one built into the transceiver is used. The 200-PS operates on either 110 volts AC or 220 volts AC, selected by
changing fuses.
It is anticipated that a plastic or simulated leather carrying 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
approximately as indicated in the following table.
TABLE 2-1. SWR VERSUS OUTPUT
SWR
APPROXIMATE
OUTPUT
NOTE
1.0 100 watts High SWR will not damage the
1.1 98 watts Atlas transceiver. You may feel
1.2 95 watts free to operate regardless of the
1.3 90 watts SWR. Only power input and
1.5 80 watts output will suffer. Reflected
2.0 50 watts voltage will not cause damage.
3.0 20 watts
2-12. AMMETER READINGS. The ammeter on the Atlas transceiver provides an excellent indicator of
impedance match. In CW transmit mode, the Mic. Gain control becomes the Carrier Insertion control. With a
close match you will be able to run the ammeter up to 12 amps or more (with supply voltage of 13.6 VDC or
117/230 VAC).
2-13. INFINITE SWR PROTECTION. The Atlas transceiver has a built-in reflecto-meter which automatically
reduces transmitter drive as SWR increases. This makes the power transistors nearly immune to 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 following procedures.
(a) Switch the bridge to "Forward" or "Sensitivity position.
(b) Set the sensitivity control on the bridge to maximum clockwise position.
(c) Set Mic. Gain on Atlas transceiver to minimum.
(d) Set the transceiver Function Switch to CW mode.
Advance Mic. Gain until meter on bridge reads just full scale. (Mic. Gain is Carrier Insertion control in CW
mode).
Switch bridge to "SWR" or "Reflected" position for the SWR reading.
Tune the transceiver up and down in frequency until you locate minimum SWR. This will indicate the
resonant frequency of the antenna, and also the SWR at that frequency.
Switch the transceiver back to REC. mode. See Caution note, next page.
(e)
(f)
(g)
(h)

CAUTION
OPERATE THE TRANSCEIVER IN CW MODE FOR ONLY 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
dynamic Mic. is selected, it should preferably be the high impedance type. The choice of microphones is important
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 connection is for the shielded Mic. lead, and the sleeve or barrel is the common 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
instructions that come with the Mic. Open the case and locate the switch contacts that short the Mic circuit when the
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 ground. Keying potential is less than 10 volts, positive, and draws 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 transceivers have a function switch which provides for switching into the CW Transmit mode. However, 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.
Figure 2-1. Remote CW Transmit Switch for ATLAS Transceivers
8

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 along with the two diodes. Other parts required are two phone plugs, a 9 pin Noval plug, a 4 conductor
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 Transmit mode.
Operation 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, and the switch to pin 4 or the EXT. OSC. socket. This causes the relays in the transceiver to close, placing
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
transceiver, and is for plug in of the Atlas Model lOx Crystal Oscillator accessory, Model 206 External VFO, 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 SOCKET. This socket is also a 9 pin Noval, 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 illustrates how to connect a linear amplifier 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 be positive going. Most linears with an ALC output circuit are negative
going. If this is the case with your linear, and you wish to utilize ALC control from the linear, it will be necessary
that you modify the linear ALC circuit. This will usually consist of reversing one or two diodes in order to generate
a positive voltage control instead of negative.
In view of this requirement, you may choose to use the ALC system of the Atlas transceiver alone. Most 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 rear bracket(s)) should be angled as straight back as possible in order to give good support for pushing 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 one for best ease of operation, and least interference with automobile controls. Then carefully
measure each bracket for length and angle of bend on its toot. Bend as required. After bending the brackets,
they may be painted with flat black to match the anodized aluminum parts, if desired.
3. Remove the acorn nut and hex nut. Slip 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 external speaker may be connected as follows: Locate the speaker plug on the back of the mobile mount, just
above the Mic. plug. Clip out the wire jumper going from the tip lug to the ring lug. This will disconnect the
internal speaker. Connect the external speaker from the 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
electrical insulation. In order to ensure electrical bonding between the transceiver and the car chassis, shakeproof
washers must be used under all screw heads. They will cut through the anodizing. Scraping the anodizing off
around the junction points on the rear bracket(s) is also recommended. Poor grounding may lead to transmitter
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, either the bulkhead or transmission hump.
8. The power cable should be run from the mobile mount through the bulkhead into the engine compartment. It
should then be connected to the positive and negative terminals as close to the battery as possible. The best way
to connect directly to the battery terminal posts is by drilling and tapping for a 10-32 or 10-24 machine screw.
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 close to the battery end of the cable, at some convenient place on the side of a metal panel or
bracket. Sheet 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 the positive red power lead, install
No. 10 terminal lugs, and secure firmly to the circuit breaker with washersand nuts. Solder the terminal lugs.
NOTICE
The advantage of connecting directly to the battery posts is that loose battery clamps will then not affect the
transceiver connections, and the danger of intermittent voltage spikes is reduced. If drilling and tapping the battery
posts is not practical, then connect the leads to the engine end of the heavy battery cables. The negative cable will
usually be found going to a grounding bolt on the engine block, and the positive cable usually goes to a bolt on the
starter solenoid. Use proper terminal lugsat these points for connecting the leads.Battery clampsand terminals
should be cleaned and tightened periodically. Anti-corrosion grease is a good recommendation. All other electrical
connections under the hood: alternator, regulator, ignition coil,etc.,should also be checked and tightened.
Figure 2-2. Linear Amplifier Connections to ATLAS Transceiver
10

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 screws. Figure 2-4 illustrates how the transceiver can be hung under the dash, or mounted over
the transmission hump. Each installation is different, so this must be left to the individual. 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 screws are for attaching the brackets to the sides or bottom of the transceiver. They will replace 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
screws will make the brackets more secure than the original No. 4's would. The No. 14 screws are for securing the
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 advantage of doing this is that even if the battery clamps work loose, it will not
11

affect the transceiver connections, and the danger of intermittant transient voltage spikes will be reduced.
If drilling and tapping the battery posts is not practical, then connect the leads to the engine end of the battery
cables. The negative cable will usually be found going to a bolt on the engine block, while the positive cable
usually goes to a bolt on the starter solenoid. Use proper terminal lugs at these points for connecting the leads. The
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 the positive red (or white) power lead, install No. 10 terminal lugs, and secure firmly to the circuit
breaker with washers and nuts. Solder the terminal lugs.
2-27. OTHER D.C. INSTALLATIONS. In the event that you have not purchased the DMK, MBK, or DCC kits,
your transceiver comes with two banana jacks for the positive battery lead, and are to be connected in parallel as
shown in Figure 2-5. The banana plug connects to the negative battery lead. The battery leads should be of No. 10
or No. 12 gauge stranded wire of the automotive type. A 20 amp. fuse or circuit breaker should be installed in the
positive lead. Figure 2-5 illustrates the proper connections required between the battery and the Atlas transceiver.
CAUTION IT IS EXTREMELY IMPORTANT THAT PROPER
POLARITY BE OBSERVED. THE POSITIVE BATTERY LEAD MUST GO TO THE TWO TERMINALS CLEARLY
MARKED ON BACK OF THE TRANSCEIVER. THE NEGATIVE BATTERY LEAD MUST GO TO THE
TRANSCEIVER CHASSIS GROUND, AND THE BANANA PLUG IS FOR THIS PURPOSE. EVEN MOMENTARY
CONNECTION OF THE WRONG POLARITY WILL DESTROY THE TRANSISTORS, AND VOID THE ATLAS
WARRANTY.
Figure 2-5. D.C. Power Connections
12

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 Atlas Transceiver be firmly seated in the console. When installing the transceiver in
the console, always make sure that the unit is pushed all the way into the 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 impedance are made by manufacturers of mobile antennas, but unfortunately our tests on all the most popular
brands indicate that your chances of coming up with a close match are less than 1 to 10. Average base impedance is
18 to 23 ohms. Therefore, some method of transforming the antenna base impedance to 52 ohms is required. (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 "borrowed" from the lower part of the loading coil. The capacity value must be determined experimentally,
and will vary from band to band, as well as from installation to installation.
On 75 meters, the capacity will generally need to be in the 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 permanent capacitor by paralleling two or more silver micas. This will divide the
R.F. current and reduce the chances of overheating a single capacitor with too much current. Follow the procedure
described in paragraph 2-14 when tuning the antenna.
2-32. NOISE SUPPRESSION. The subject of noise suppressing automotive ignition and alternator 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 probably 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 on noise suppression. It will usually be found in the mobile sections. Estes Engineering Co.,
930 Marine Dr., Port Angeles, Wash. 98362, manufactures an excellent line of suppression kits which can
help cure the more stubborn cases. It is quite likely that your dealer sells the Estes Engineering line also.
IMPORTANT: Make sure that the transceiver mounting brackets are well grounded to the transmission hump or
bulkhead.
13

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 the old tube rig, and now you discover the new solid state rig doesn't like the old antenna. Refer to the
antenna handbooks for helpful data, or ask your dealer about antenna tuners now on the market.
Figure 2-6. Model 220-CS/200-PS Schematic
14

SECTION 3
OPERATION
3-1. INTRODUCTION
This section provided instructions for operating the ATLAS 210x/215x transceiver and identifies operating
controls, indicators, and connections. Front panel controls and indicators are shown and described in Figure 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 Switch has an OFF position which turns off the DC supply to the low current circuits. The high
current circuits (Driver and Power Amplifier) remain connected to the DC supply line, but are automatically
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 rather than the Function Switch OFF position.
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 mode without having to hold the push-to-talk button down. The CW position is also transmit mode except
that the Mic. Gain control now becomes a Carrier Insertion control and carrier frequency has been shifted about
800 Hertz. (See CW 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
increase in background noise.
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, increase the A.F. Gain correspondingly, and realize 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.
15

Figure 3-1. Front Panel of ATLAS 210x
Figure 3-2. Rear Panel of ATLAS 210x/215x
16

The 0 to 500 dial scale is used on all bands. The 0 to 500 dial scale reads directly on the 7, 14, and 21 MHz bands.
On the 3.5 MHz band, the dial scale reading is additive. The 10 meter band is calibrated directly above the dial
scale and reads from 28.4 to 29.4 MHz. The increment markings on the tuning knob skirt are 1 kHz apart on the
lower bands, and 2 kHz apart on 10 meters.
3-9. BAND SELECTOR AND TUNING DIAL, MODEL 215x
The number on the band selector reads in MegaHertz, the same as on Model 210x, except that it has the 1.8 MHz
band instead of the 28.4 MHz.
The 0 to 500 scale reads directly in KiloHertz on the 7, 14, and 21 MHz bands. On the 3.5 MHz bands, the dial
scale is additive.
3-10. DIAL SET
This panel control is for adjusting dial calibration to exact reading at a 100 KHz marking
3-11. CARRIER BALANCE
A trim pot is located on the PC-100C plug-in board on the right side of the transceiver. Next to the trim pot is a
capacity trimmer which is the phase control. These trimmers should be adjusted for minimum carrier on the lowest
frequency band. Connect a dummy load to the transceiver, and measure output voltage in TRANS mode with MIC.
GAIN at minimum. It should null down to a level of 0.10 to 0.15 volts RMS. Other bands will give a false reading
due to oscillator feedthrough which is not suppressed as much as the carrier.
3-12. S-METERZERO
This is a trim pot located on the PC-200C plug-in board. The PC-200C PC board is located under the dial drum. It
can be reached with a phillips screwdriver from the top, just behind the dial light switch. Disconnect the antenna
and adjust the trim pot for meter 0.
3-13. CRYSTAL CALIBRATOR. The 100 kHz calibrator should be checked every 6 months or so against a
frequency standard such as WWV. Aging will cause it to gradually change frequency, especially during the first
few months. The calibrator is mounted on the back side of the aluminum partition, under the shield, behind the dial
drum. A capacitor trimmer in the upper left hand comer is for frequency adjustment. A test lead may be run from
terminal 1 of PC-100C to the antenna terminal on a general coverage receiver which is tuned to one of the WWV
frequencies: 2.5, 5,10 or 15 MHz. Adjust the trimmer for zero beat when WWV interrupts their tone modulation.
3-14. PROPER TUNING OF SINGLE SIDEBAND SIGNALS
Precise tuning of a single sideband signal is very important. Try to tune exactly to the frequency where the voice
sounds normal. Avoid the habit of tuning so the voice is pitched higher than normal, and sounds like Donald Duck.
This is an unfortunate habit practiced by many operators. If you tune for an unnatural high pitch you will then be
off frequency when you transmit. Chances are that the other station will then shift to your frequency while you are
talking, and gradually you will move up or down the band. Sooner of later one of you will accuse the other of
drifting . . . So, take the extra care to tune for a natural sounding voice, and you will then be enjoying the very best
quality in voice communications.
315. VOICE TRANSMISSION
Normal operation is with the Function Switch in the REC. position. Pressing the Mic. button switches the
transceiver into transmit mode. Or, if the VOX accessory is installed in the 220-CS console, speaking into the Mic.
will switch the rig into transmit mode. A TRANS. position is also provided on the Function Switch for locking in
the transmit mode, or in case the Mic. does not have a press-to-talk switch.
17