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SERIAL NO.
Figure 2 -2. TR-7 Rear Panel
2-3.3 MICROPHONE REQUIREMENTS.
Use a microphone with a flat frequency response.
The microphone should have a cardiod pattern to
reduce pickup from the back and sides. Connect
the microphone as illustrated in figure 2-3, using a
Drake # 329-1055 connector. The use of a pre-
amplified microphone is not recommended, dueto
the possibility of overdriving the input audio stages
of the TR-7. The Drake Model 7 07 3 DM micro-
phone is ideally suited for mobile use with the
TR-7 .
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AUDIO
PTT
Figure 2-3. TR -7 Microphone Connection .
2-3.4. EXTERNAL SPEAKER REQUIREMENTS .
The TR-7 has a built-in speaker. In high noise en-
vironments, however, it may be desirable to em-
ploy an externa! speaker located close to th e oper-
ator. Use of an externa! speaker automatically dis-
ables the interna! speaker.
DO NOT co nne~t
the TR-7 to the speaker of the
car radio: ln sta ll a separat.e .
.J.
ohm speaker capable
of handlin!c( at least 2 watts of audio. See figure 2-2
for lo cation of t he externa] speaker jack. which ac-
cepLs a sta ndard 2-circuit phone plug wired such
that Lhe tip is 'hot·.
IN STALLATI ON
2-4
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