Antenna connection to the R-4A is provided at the jack on the rear of the
chassis marked ANT.
It is recommended that when the R-4A is used with a transmitter, the trans-
mitting antenna be used; change-over being accomplished by an antenna
relay.
This function is provided
internally in our model T-4 and T-4X
Transmitters.
E.
SPEAKER REQUIREMENTS
A good quality 4 ohm speaker should be connected to the jack on the rear
of the chassis marked SPKR.
If one lead of the speaker is grounded to its
cabinet, its connection should be to the chassis of the R-4A.
Our accessory speaker model MS-4 provides the correct match, correct
tonality for good communications audio, correct connector, and is
com-
patible in appearance with the R-4A.
It will also house our model AC-4
power supply which is needed in conjunction with our model T-4 and T-4X
Transmitters.
F.
ANTI -VOX
A high impedance output is provided at the ANTI-VOX jack on the rear of
the R-4A chassis for use with our T-4 and T-4X transmitters and other
transmitters having voice control capabilities. The impedance at this
terminal is approximately 5000 ohms.
If the transmitting equipment
requires a lower impedance it may be necessary to attach a matching
transformer between the ANTI-VOX terminal on the R-4A and the ANTI-
VOX input terminal of the transmitter,
or to use the speaker output.
G.
MUTING
The Mute jack on the rear of the R-4A is connected so that when the
function switch is in EXT-MUTE position the receiver will operate only
when the inner-conductor of this jack is shorted to ground, and the
R-4A
will mute when the inner-conductor is open with respect to ground.
The inner-conductor should, therefore, be connected to a relay contact in
the transmitter or antenna relay which is normally open when transmitting
and grounded when receiving.
It is recommended that a shielded wire be
used between the mute terminal and the relay such as is provided with our
model T-4 and T-4X Transmitters.
If external muting is not desired, the STBY and ON positions of the function
switch can be used.
It is necessary to insert a shorted plug in the Mute
Jack to obtain N. B. and CAL functions.
Such a plug is installed in each
R-4A when shipped.
-7-
(66 pages)
(472 pages)
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