Heathkit HW-12 - Page 45

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MICROPHONE
MICROPHONE
:
Any high impedance crystal, dynamic, or ce-
ramic microphone having a minimum output of
10 millivolts can be used with the Transceiver,
Pictorial 22 shows how most communication
microphones can be wired for VOX, PTT, or
both types of operation, The only difference
in wiring to change the microphone from just
PTT operation to both types of operation, is the
addition of the jumper wire in the microphone,
This additional wire keeps the audio iead from
being opened when the microphone button is
released, thus permitting VOX operation with
the Transceiver, When wired in this manner the
switch OL the micr ophone will actuate the relay
of the Transceiver for PTT operation,
The Transceiver must be placed in a location
with adequate ventilation because of the amount
of heat given off by the tubes, Inadequate ventila-
tion could cause considerable damage to the
circuit components,
The power supply can usually be located under
a table or some other out-of-the-way place,
since it is controlled by the FUNCTION switch
of the Transceiver.
he Transceiver requires ab
t al
watts of power when transmitting, it should not
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PICTORIAL 22
A microphone not having a switch will be satis-
factory for VOX operation by installing the male
microphone connector supplied, The audio lead
should be connected to pin #1 and the shield
shouid be connected to the spring of the con-
nector,
The Transceiver should be grounded toa ground’
rod or cold water pipe, Make the ground con-
nection to the Transceiver at one of. the cabinet
mounting screws.
ee Cage Cee
A doublet antenna fed by RG-58 or RG-59 cable,
or an inverted ''Vee" type antenna fed with coax
abie will work very well with the Transceiver.
Chee types of antennas using high impedance
awa fan Aiann a pi i alte a
ena-1éeaing, off-center feeding, open wire lines,
or 300 2 twin lead, can be used if an antenna