Connect Systems Inc. - Model 9800 Page 44
CTCSS BOARD (Option TSU-32P)
Sub-audible Continuous Tone Coded Squelch System (CTCSS) tones can be
added to the 9800 by simply plugging in a board. This option allows
the 9800 to have CTCSS operation when connected to a radio which is
not equipped with a built-in CTCSS decoder.
CTCSS operation allows the 9800 to respond only to those mobiles which
are encoding the correct tone frequency. Thus providing discrimination
against unwanted signals. CTCSS operation can be mobile to patch only,
or if desired, mobile to patch and patch back to mobile. The latter
protects the mobile from having to listen to unwanted chatter while
monitoring for a call.
The TSU-32P regenerates the selected CTCSS tone for the purpose of
providing patch to mobile CTCSS. (Of course, the mobile must be
equipped with CTCSS decode). The regenerated CTCSS tone is available
on the rear panel barrier strip labelled TONE. If used, the
regenerated tone must be injected directly into the transmitter's
modulator through a suitable series resistor. (Try 10k-100k). Choose
the largest resistor possible that will provide sufficient CTCSS tone
modulation deviation. (500-750 Hz.)
CTCSS operation is compatible with VOX mode, Duplex mode, and/or
Repeater mode. However, the time required for decoding low frequency
tones makes CTCSS operation incompatible with the Sampling mode.
Installation: Remove the 9800 board from the chassis. Install the nine
AMP type connectors into the space marked 'TSU-32P' on the board.
Solder the AMP connectors from the bottom. Be sure no solder flows
into the connectors. Cut jumper strap JP-4 (Just to the right of the
TSU-32 mounting position). Plug the TSU-32 board into the newly
installed connectors. Set the dip switches to provide the desired
CTCSS tone frequency using the table below. If the regenerated CTCSS
has been connected, set the CTCSS modulation to the desired level
using the potentiometer on the TSU-32P. Note that the 'JU-2' option
strap on the TSU-32P board must be cut. See the TSU-32P instruction
sheet for details. This strap is already cut if the TSU-32P was
factory installed.
DIP
Switch
CTCSS
Freq
Dip
Switch
CTCSS
Freq
Dip
Switch
CTCSS
Freq
Dip
Switch
CTCSS
Freq
12345
00000
10000
01000
11000
00100
10100
01100
11100
67.0
71.9
74.4
77.0
79.7
82.5
85.4
88.5
12345
00010
10010
01010
11010
00110
10110
01110
11110
91.5
94.8
97.4
100.0
103.5
107.2
110.9
114.8
12345
00001
10001
01001
11001
00101
10101
01101
11101
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
12345
00011
10011
01011
11011
00111
10111
01111
11111
156.7
162.2
167.9
173.8
179.9
186.2
192.8
203.5
