Connect Systems Inc. - Model 9800 Page 5
Noise Squelch Connection: Connect to a point that has
considerable voltage swing when the squelch is
opened/closed. The best point to connect is to the
collector of the transistor that controls the busy light
(if the radio has one). Otherwise, connect to the output
of the noise rectifier.
DPL or CTCSS Squelch: The receivers' DPL or CTCSS
decoder will have a logic output that goes high or low
when a properly encoded signal is received. Connect this
point to the COS input.
If the point selected goes more positive (voltage
increases) when a signal is received, strap JP-6 center
to the + side. If the point goes to a lower voltage,
strap JP-6 from center to the - side.
When the COS threshold control P11 has been properly
adjusted (described below), and JP-6 properly strapped,
the front panel noise LED will go out when a signal is
received. This condition must be achieved for proper
operation of the interconnect.
AUDIO OUT: Connect to the Mic high line. If Mic loading occurs
install a resistor in series with the Audio Out lead and
cut JP-3. The resistor should be large enough to prevent
Mic loading but small enough to achieve adequate land to
mobile audio. Try 100K as a first cut.
PTT: Connect to the base station PTT line.
Note: Some radios will need the Aux. Relay connected to
the hookswitch before the transmitter can be activated.
Others may require positive keying. See 'Auxiliary Relay'
page 41 for details.
TONE The TONE output is used to inject signaling tones
separately from voice audio and is normally only
connected if option TSU-32P is installed or CTCSS
signaling is selected (line 4.3.). However two tone and
five / six tone can also use this output if desired.
Connect the TONE output past the instantaneous deviation
control (IDC) circuit in the transmitter. Preferably
directly to the modulator.
The 9800 can place the signaling tones on the AUDIO OUT
port or, out the TONE port (except DTMF). We recommend
using the TONE port for CTCSS signaling, and we recommend
using the AUDIO OUT port for other signaling.
If you are using the TSU-32P and want signaling tones to
use AUDIO OUT, remove resistor R-105.
