Ten-Tec OMNI-VII User Manual page 9

We include a spare 8-pin microphone
connector (P/N 35363) with the packing kit
to allow rewiring of your current mic for use
with OMNI-VII The pinout for the 8 pin mic
connector on the front of the OMNI-VII is
shown in Figure 2-2. Recommended wiring
.
is shown in Figure 2-3
Figure 2-2. Front view, mic connector, on
front panel of OMNI-VII
588 manual
Part #74409
Printed in USA
Figure 2-3. Recommended mic cable
wiring.
Pin 2 (+9 Vdc) need only be connected if the
microphone element in use is an electret
condenser requiring a polarizing voltage.
Chassis ground and mic signal ground are
separated to reduce the possibility of
introducing stray hum or RFI into the
transmit audio signal.
We recommend that the case of the
microphone also be tied to chassis ground
on the transceiver via a shielded cable to pin
5. This is to help assure stray RF does not
have a path to be coupled into transmit
audio. Cable carrying mic signal and mic
signal ground should be shielded. This
prevents the cable itself from acting as an
antenna and coupling RF back into mic
audio.
Some aftermarket microphones are not
wired with separate microphone signal
grounds and chassis ground. We
recommend separate pins for use for mic
Second release – August 2007 9