DRAKE R8A - Page 16

Mute Operation of the Receiver 14
MUTE OPERATION OF THE R8A COMMUNICATIONS RECEIVER
When using this receiver with an external transmitter, it
is often desirable to be able to externally mute the
receiver during transmission. The receiver provides this
external control by use of the “MUTE* connector
located on the rear panel. Grounding the center pin
of this connector forces the AGC circuitry to shut down
all RF/IF stages, thus quieting or muting the receiver.
The mute line does not disconnect the antenna. Older
Drake equipment required the mute line to be grounded
for receive. This receiver requires ground to mute.
When using the receiver with older Drake equipment,
an external relay is recommended to operate the
mute line. Sometimes this may be accomplished by
using a spare set of relay contacts on the antenna
switch-over relay.
If you are not operating a linear amplifier, you can use
the vox relay contacts to provide control of the re-
ceiver muting. Simply connect the two pin jack or RCA
phono socket of the AC-4, PS-75, PS-7, power supply to
the mute jack on the R8A.
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ANTENNA RELAY CONTROL pelganin
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BIG:
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7
aR R8A RECEIVER
TRANSMITTER
|
ANTENNA
COAX
ANTENNA
COAX
|
MUTE
CABLE
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FIGURE 7 SUGGESTED HOOKUP FOR MUTE OPERATION