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2-4.2. POWER REQUIREMENTS.
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Linea r Ampli f ,er
'TR7 A ..
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Cable
TR 7
POWER CABLE
The PS-7 A.C-. Power Su pply is recommended far
fixed station operation . It is designed to accommo-
date all operating requirements presented by the
TR-7 , and provides automatic overvoltage and
overcurrent protection. See figure 2-4 far intercon-
nection d etails.
Far general infarmation regarding power sources
other than the PS-7, see section 2-3.2 of this
manual.
M S7
RV 7
ANT
R'J7 C.ONTROL CA&\.E
PS7 C:ON'TRO\. CAII\.E.
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- - - GR~"D_S>~P
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PS7
NOTE : Be sure PS-7 Line Voltage program·
ming is co rrect for your insta llat1on .
AC.
vox
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13~VOC.
Figure 2-5. Connecting the RV-7 Remate VFO anda Linear Amplifier
2-4.3 . MICROPHONE REQUIREMENTS.
The R. L. Drake Model 7077 Desk Microphone is
recommended far u se in fixed station applicatio ns.
The unit is supplied wired with a mating connector
for the TR-7.
The front panel MIC connector has been wired to
accommodate two types of microphones. For use
with a dynamic microphon e, su ch as the Drake
Model 7077, the connections should be made as
shown in Figure 2-3 of this manual. For a hi gh out-
put, high impedance crystal or ceramic mi crop hon e,
such as the Astatic Model D-104, the microphone
audio should be wired to pin 4 of the connector in-
stead of pin
l.
Pin 4 presents an input impedance of
approximately 750 K ohms, and is 8 dB less sensitive
th an the pin 1 input.
If
your operating habits are such that you 'close
talk' a microphone, or if you have a very loud speak-
ing voice, you may find it benefi cia! to rewire· a dy-
nami c mi crophone such as the Model 7077 by moving
the audio lead from pin 1 to pin 4 inside the micro-
phone con necto r. This will eliminate the chances of
overdriving t he TR- 7 a udio input in these instances.
INSTALLATION
2-6
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