User's Manual

10 11
Pin No. Function Description Signal Type I/O 7 (default)
Audio IN (Mic) / Monitor
Audio signal that is fi ltered (high pass and pre- emph) then follows same route as data mod through LPF. Sub- audio tone is mixed with audio after the LPF.
1KHz audio at 60% peak system deviation input level = 6 to 8mV rms
I/P
Grounding line activates monitor action
<100k resistor to ground
7 Link option
RSSI RSSI Level 1 to 3.5 V O/P
8 Program data IN/ serial
command
Used for serial command for radio control or is used for inputting programming data
TTL level (RS232 converter in programming cable)
I/P
9 Audio OUT Audio output from the audio
amplifi er. Filtered by tone-fi lter and de- emphasis circuit.
1KHz audio at 60% peak dev. produces nominal 1Vrms @ 8Ω
O/P
10 RS232 Data IN for
option module
Data input when the option module board is installed.
RS232 level I/P
11 RS232 Data Out for
option module
Recovered data output when the option module is installed..
RS-232 level O/P
12 (default)
Buffer status( busy) for option module (reserved)
Indicates buffer status to prevent data loss according to buffer overrun
RS-232 level O/P
12 Link option
Lock Detect signal PLL lock detect signal >3V out of lock
<0.5V in lock
O/P