User's Manual

8 9
3 PTT In
(Tx Key)
Signal, which keys the transmitter, when operating as a dumb radio. Note: If the option module is installed, RS232 levels must be selected on CON407. See Module manual.
TTL level 0V = Tx open cct = Rx RS232 level (option) +12V = Tx -12V = Rx
I/P
4 Ground Ground connection to chassis
of the radio.
0V (Chassis)
5 Program Data Out/
Serial Data Output
Programming data output / Serial data output.
TTL level (programming cable has RS232 converter)
O/P
6 Busy
(CD)
Logic level output to indicate presence of a carrier. Note: If the option modem is installed, RS232 levels must be selected on CON407. See Module manual.
TTL level 0V = carrier 5V = no carrier RS232 level (option) +12V = carrier -12V = no carrier
O/P
Pin No. Function Description Signal Type I/O 1 Program
Data modulation IN. (used with an external modem)
AC coupled signal directly injected through data low pass fi lter without pre-emphasis.
Input signal 1KHz audio at 60% peak dev. input level = 100 to 120mVrms
I/P
1 Program option
POCSAG input DC coupled direct signal
designed to work with TTL level signals only
TTL Levels I/P
1 Program Opt & h/w changes
AC coupled FM direct modulation
AC coupled direct FM signal, without fi ltering
350mV @ 60% adjustable
I/P
1 h/w changes
DC data modulation IN DC coupled direct FM signal,
without fi ltering
1.9V dc offset 450- 550mV @ 60%
I/P
2 Data OUT
(RX disc)
Discriminator Audio, unprocessed AF signal
1KHz audio at 60% peak dev. produces 200 to 300mVrms
O/P