Hy-Gain 23 Plus, 603 Installation & Operation Instructions

ORDER NO.

INSTAllATION

&

23 CHANNEL CITIZEN BAND TRANSCEIVER

Plate Power Input

to Final:
Modulation:
Harmonic Suppression:
Carri er Oeviation:
Antenna Match:

Sensitivity:
Selectivity:
Intermediate FreQJency:
Image Rejection:

Audio Output

External Speaker

Impedance:

Dimensions:

Net Weight:

5 watts
AM; up to 100%capacility
Bett(:!rthan 55db down

Less than .005%

50-75 ohms

.8uV for 10db S+N to N ratio
6KHz bandwidth -6 db

1st IF-11.275MHz; 2nd IF-455KHz

-75 db

4 watts

105-120 volts, 50/60 cycl es AC;
12 volts DC
AC -80 watts
DC -3 1/2 amps rec.; 4 amps trans
12"W x 5"H x 81/4" 0
171bs.

603

OPERATION INSTRUCTIOIS

HY-GAIN ELECTRONICS CORPORATION

Rural Route3 Lincoln, Nebraska 68505

V1

V2
V3

V4

V5
V6

V7
V8

V9

VlO

V11

01,02 1N60/1N34
03 1S1516

04 1S72

05 1001
06 1004
07 1004

08,091004
010,011 1006
012 1006

6BL8

6BL8

6BA6
6BA6

12AX7
6A05
6GH8
6GH8

6BA6

6B05

12An

RFamp/1 st Mi xer
2nd Mixer/2nd Osc.
IF Amp (455 KHz)
IF Amp (455 KHz)

1st Audio/Mvdulator/Mic Preamp
Audio Output/Modulator
Local Osc.
Converter/1st Osc.
Buffer Amp
RFPower Amp
Buffer/Synthesi zer

Meter Rectifier

Oet/AVC
ANL
Squelch bias
Mod. hooster

Mod.Iimiter
Absorber
B+ Rectifier
Bias Supply Rectifier

The Hy-Gain 23 Plus is designed to receive AM signals in
the 26.965 to 27.255 MHz Citizens Band. The circuit is a
highly sensitive and selective dual-conversion super-
heterodyne type with one RF and two IF amplifiers. Full
23 channels, crystal-controlled operation is provided by a
frequency-synthesized circuit consisting of 12 crystals.

The receiver section includes an SMeter for reading signal
strerg~h, an adjustable squelch control to eliminate back-
ground noise when no signal is being received, an auto-
matic noise Iimiter to s~ppress atmospheric and man-made

interference, and a band spread which has a range of 2.5

KHz, which permits reception of stations that are trans-

The transmitter is designed to transmit AM signals in the

26.965 to 27.255 MHz Citizens Band. The crystal synthe-
sized circuit used in the receive section is commonto,the

transmitter, and provides full 23 channel crystal-controlled
operation. A push-to-talk ceramic microphone control s
the reliable relay switching. Plate modulation with.100%

capability is used with up to 5 watts plate power input to
the fi nal RF stage. An RF meter -jildi cates reiati ve RF
power at the antenna duri ng the transmit mode when the
meter switch is in the appropriate position.

Select theAC power cord and attach the a-pin connector
to the a-pin connector at the rear of the unit.

coil cord into the transceivers microphone connector in
the center of the front panel. Be certain that it is secured
firmly with the knurled ring.

Always line up the key \-tay properly before pushing thft
cable connector onto the transceiver. Do not attempt to
force the connector onto the pins, when it is properly lined
up, the connector will slip on easily. Make certain the
transceiver is off (the switch is located at the extreme
counter-clockwise position of the volume control), then
insert the AC plug into the AC outlet. For protection, the

AC input to the transceiver is fused within the unit.

The antenna lead-in cable (RG-58Uor RGaU) should be

terminated with a PL~259type coaxial connector which

should then be attached to the antenna connector at the
rearof the transceiver.

The mobile mounting bracket may be used in a base instal-

lation by attaching it to the underside of the transceiver.

Whenso used the four rubber feet may.be attached with a
bracket. This wiII all ow the transceiver to be set at an
angle, providing a better view of the front panel.

Before installing the Hy-Gain 23 Plus in the car, truck,

boat, etc., make certain to use a location which permits
the driver to operate the controls of the unit without inter-
ferring with his driving functions. The transceiver can be
mounted to the undersi.deof the instrument panel, on the
floor, or above the drivers head if in a truck cab. Remove
the bracket from the transceiver by loosening the four (4)

knurled screws at the sides. Using the bracket as a pat-

tern, locate the positions of the screws anddrill holes for

the four (4) self-threading screws which ara provided.

After mounting the bracket, secure the transceiver to the
bracket by meansof large knurled screws.

DC POWER CONNECTION

CAUTION

The Hy-Gain23Plus is designed for use only in vehicles

employinga negative ground system. Do not use in posi-

tive ground vehicles!

The red wire in the DC power cabla should be connected
to the positive battery sourceof the vehicle. This lead is
fused for a amps. Points normalIy available for connection
are the accessory posts on the ignition switch, the acces-

sory side of th~ fuse block, or directly to the positive

lead of the vehicles battery. The black lead should be
connected to any metal portion of the vehicle chassis.

When the red and black leads have been properly connec-
ted, the 8-pin connector of the DC power cord should then
be attached to the power connector at the rear of the trans-

cei ver. AI ways line up the keyway properl y before pus h-

ing the cable connector into the transceiver. Do not

attempt to force the connector onto the pins, when pro-
perly lined up the connector will slip on easily.

Attach the 4-pi n connector at the end of the microphones
coil cord to the microphone connector in the center of the
transceivers front plate. Secure it firmly by means of the

knurled securi ng ri ng.

vertically po larized whip which can be ei1her
ed type, or a full quarter wave.
body of the vehicle as a ground piChe. The antenna can
be mounted on the trunk deck, eithel" of tile
or on the roof. When purchasing your nmbile antenna, you
wi II find fu II instructions for installation included with
the antenna.

For optimum results of the mobile installation, the length
of the coaxi al cabl e should be ideally 11'9"or multiples
thereof. However, Iengths other than multiples can prO-

vide optimum results if the antenna used can be tuned.

The lead-in cable should be terminated with a PL-259
coaxial connector which is then attached to the antenna
connector at the rear of the transceiver.

8od1 l\!Pes

at-.e ~

use a

mar

fenders

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~ ~ r-~-_-_-_-_-_-_-_-_-_~•••.•

~n

T'we11tY-~hTee

<Plus

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CB

PHONE /SPKR

1) Illuminated Meter -- indicates strength of incoming sig-

nal in "S" units; or RF antenna power of the transmi tier.

2) Meter Selector Switch -- when in "S" position meter
reads "S" units; when in RF position meter reads RF
power.

3) Channel Indi cator -- illuminated di al shows channel to
which the transceiver is set.

4) Channel Sel ector -- rotating switch sel ects anyone of
23 CB channel s.

5) Speaker -- 5" round speaker mounted behind front plate.

6) Modulation Indicator -- operates when the unit is in the
transmit position, Iight glows brighter as modulation

reaches 100%.

7) PA-CB Switch -- CB position provides normal CB oper-
ations. PA position permits use of the transceiver as a

publ ic address system when in the transmit mode. When

in the receive mode, the PA position enables you to moni-

tor over the external speaker.

8)

Phone Jack -- standard phone jack for external speaker
or headphones. Insertion of the plug into the jack auto-
matically silences the internal speaker.

10) Band Spread -- Enables you to "tune-in" stations that

are off frequency.

11) Volume/On-Off Switch -- controls output level from
the speaker. When in the full counter-clockwi se position
it operates as a power switch.

12) Squelch Control -- this control is used to block out
background noi se when no si gnal is on the channel.
Squelch is adjustable with higher sensitivity in the full
clockwi se position.

13) Load Control and Plate Cohtrol -- these two controls
should be alternately adjusted to indicate maximum power
on the meter when the meter is in the RF position.

14) Antenna Connector -- This connector wi II accept a
standard PL-259 from your base or mobile ant8nna.

15) TVI Trap -- this is an adjustable network inserted

in the antenna circuit. When tuned correctly it suppresses
television interference.

16) Power Connector -- th is connector connects to ei ther

the AC or DC power cord.

17) Meter Adjust -- th is adjustment adjusts the el ectrical
"zero" of the "S" Meter.

Place the PA CB Switch in the CB position. Rotate the

squelch control to the extreme counter-clockwise position
(without operating the stand-by switch), and select desired

channel. Rotate the volume control knob until the on/off

switch clicks, and the unit is in the on position. The
meter Iight wi II glow softl y. Advance the vol ume control
about 50%. After approximatel y 20 seconds the tubes wi II
warm up and you will hear the characteristic rushing sound
of the receiver. Adjust the volume control to a comfort-
able listening level.

The squelch control is used to el iminate background noi se
when there are no signal s present on the channel. To ad-
just the squelch control sel ect a channel where there is
no signal. Turn the volume up to a fairly high level. Ro-
tate the squel ch control clock wi se unti I the background
noise disappears. This point is called the "squelch

thmshold"; and at this squelch position the receiver will

be quiet when there is no signal on the channel, but an

incoming signal wi II be able to overcome the squelch

action and be heard. This control is variable, and as it is
advanced the squelch action is increased and consequent-

ly a stronger signal is required to break the threshold. To

recei ve extremelyweak si gnal s or to di sabl e the squel ch
circuit, merely turn the control fully counter-clockwise--
do not operate the stand-by switch.

In the stand-by position of the squelch control the high
voltages in the transceiver are switched off but the tube
fi lament voltages are maintained. This reduces power con-

sumption when the unit is not in actual use, while allow-

ing the unit to remain in a "warmed-up" condition ready
for instant use when needed.

The band spread control has a range of approximately 2.5
KHz, and can be used for tuning in a station that is sl ight-

Iy off frequency. The switch can be rotated either clock-
wi se or counter-clockwi se to fine-tune stations that are
either high or low in frequency. When using this control,
tune for the best reception and the highest "S" meter

reading.

The meter is associated with a rocker switch which places

it either in the "S" meter or RF Meter position.

During the receive mode, the "S" meter provides a rela-

tive indication of the signal strength of incoming signals.
The S meter ci rcuit has been preadjusted at the factory to

indicate "5-9" with 100 microvolts at the antenna input,
The "S" meter should read "0" when in a receive position

and with no antenna connected. To adjust, if the meter is
not at the "0" po,;iti on, adjust the "Meter Adj ust" control
at the rear of the ::;et.