r \.
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
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