Hallicrafters HA-20 Operating Instructions Manual

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Figure I.
DESCRIPTION
The HA-20 is a self powered accessory unit,
for use with an SD_400 or SBR_9N06 tean gerivear
Or USE With an om-4UU OF on-cuUY Tr ansceiv ei,
It enables the operator to select transmit and
receive frequencies that are senaratedbyas much
as 500 KC within any band segment. It also pro-
vides the choice of two transceive frequencies
when manually switched, (HA-20 FUNCTION
switch), between R & TandSTBY, The HA-20 pro-
vides a position, (DUAL R) that permits the opera-
tor to monitor two receive frequencies simultan-
eously, separated by as little as 5 KCor as much
as 500 KC, In this position the transmitter portion
of the transceiver is inoperative.
The HA-20 calibration may be checked against
the 100 KC crystal calibrator in the transceiver.
A red panel indicator light provides visual re-
minder when the HA-20 is controlling the frequen-
cy. With the HA-20 OPERATION switch in the
OFF or STBY position, normal transceiver opera-
tion is restored,
A VSWR indicator, complete with calibrated
VSWR meter, METER switch, and METER SENS,
control is also included in the HA-20, An external
coupler is supplied for sampling the 50-ohm trans-
mission line. This unit will handle the full output of
the SR-400 or SR-2000 and may be permanently
ARM NER ETT et Tp
ee ac amen
156-008 219
Hallicrafters Mode! HA-20.
connected in the line for full time indication of
VSWR or relative transmitter power output, This
unit may also be used for checking cther antenna
systems up to approximately 450 MC, Power re-
quired for full scale forward meter reading varies
with frequency and will be approximately 90 watte
imately 90 watts
at 1.8 MC arch 1 watt at 450 MC.
INSTALLATION
To install the HA~20 with either the SR-400
or SR-2000, proceed as follows:
1, Remove the 11-pin jumper plug from the
ACCESSORY socket (rear of transceiver),
2. Install the 11-pin cable plug from the
HA-20 in the same socket,
3. Connect the 50-ohm coaxial cable from
transceiver ANTENNA output to VSWR coupler
receptacle marked TRANSMITTER.
4, Connect the 50-ohm antenna cable to
VSWR coupler receptacle marked ANTENNA,
ae Connect | the a _Wwire- front: VSWR
6. Connect the red wire to terminal marked
REV.
ae