CAT-300 Repeater Controller - Computer Automation Technology

Test Point TP2 - Transmitter Audio
This test point displays the audio generated by the controller to modulate the
repeater's transmitter. This includes receive audio, courtesy tone audio, CW
ID audio and voice synthesizer audio. During an autopatch audio from the phone
line is also present at TP2.
Test Point TP3 - Receiver Audio
This test point displays receive audio and phone line audio input during an
autopatch or control operator call-in. This test point is not used to adjust
the audio levels. However it is useful during troubleshooting the audio path.
Test Point TP4 - DTMF Decoder Audio
This test point displays the audio present at the input of the DTMF decoder
(U6). For proper decoder operation the DTMF audio should be greater than
(200mVAC RMS). When measuring this test point, make sure RF from the repeaters
transmitter or your HT is not being picked-up on the voltmeter leads. This
will cause an erroneous indication that will disrupt the alignment procedure.
Set your HT to the low power position and hold it away from the controller and
voltmeter leads or have someone off-site generate the DTMF tones.
Header Pin Assignments
Header connectors on the CAT-300, DVR-100, DL-1000, MF-1000 and RBS-1000 use
the same numbering system. Looking at the board's solder side, one of the
header pins is connected to a square solder pad. This pin is always pin one.
One row of pins are assigned odd numbers while the other row of pins are
assigned even numbers. See Figure 6-3.
2
1
Component Side View Of Headers
4
3
6
5
8
7
10
9
12
11
14
13
Figure 6-3
Connection to CTCSS Decoder
If your repeater receiver has a CTCSS decoder logic output, connect it to J3-4.
For proper operation, the CTCSS decoder input must be connected to the
discriminator audio output. Speaker or top of volume control audio exhibits
low frequency roll-off. This will cause the CTCSS decoder output to toggle
during voice peaks and the receive audio will cut out. Connect the TS-64 CTCSS
Encoder/Decoder assembly to the CAT-300 as described in Figure 6-4.
6-4
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