13
FM RADIO INTERFACE CABLE WIRING
TABLE 1
FM Radio Interface Cable Connector Pin Assignment
PIN FUNCTION
---- ----------------------------------------
1 Mic audio output to FM radio
3 Receive audio input from FM radio
4 FM radio ground
2, 5 Transmit key output to FM radio (Normally open relay
contacts closed during FM radio transmit)
FIGURE 2
Male five pin connector shown from solder side:
FM Radio Interface Cable Wiring Examples
The following are some examples of possible wiring schemes for the FM
interface cable. Only the FM radio functions are shown for the FM
radio end of the interface cable, because the connector(s) used by
radio manufacturers varies widely. You will have to consult the radio
manual or manufacturer for the connector(s) used and pin assignments
for your particular FM radio. Also, Sigtronics has extensive radio
interface experience and can assist in any question you might have
concerning this or any other aspect of the SPCC. Of course,
Sigtronics can build a FM interface cable for you to your
specifications, if desired.
Figure 3 shows the most common of such cables with its "high level
mic input" and standard "ground to key" interface. This cable will
work with most standard police, fire, and business band radios as
well as aircraft type radios. Figure 4 is similar to Figure 3 but is
used for radios requiring a low level mic input such as marine type
radios. Figure 5 shows typical cable wiring for radios that sense the
presence of mic current to transmit. Most ICOM hand-held radios are
set-up this way.
Summary of Contents for SPCC-2
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Page 7: ...5 NOTES ...
Page 16: ...14 FIGURE 3 FIGURE 4 FIGURE 5 SPCC SPECIFICATIONS ...
