Connecting to your Radios
The HF/VHF radio connector on the KAM’98 rear panel is a 9-pin DB style con
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nector, with pin layout as shown below:
[diagram of DB-9 pin connector]
Pin Pin
No.
name Function
1 TXA Transmit audio (AFSK out)
2 XCD External carrier detect
3 PTT Push-to-Talk
4 A/D-3 Analog-to-digital input 3
5 RXA Receive audio (AFSK in)
6 GND Ground
7 EXT-IN External input for Power/Reset*
8 CTRLB Control line B
9 GND/KEY Ground or CW Key line *
* See the jumper section for details.
+
Note: Also see the Auxiliary Port for additional connections.
Pin 1: Connects to the microphone input of your radio, providing the audio sig
-
nal to be transmitted.
Pin 2: When a ground is applied to this pin, the KAM’98 will not transmit pack
-
ets. This pin is normally used as an external means of supplying carrier
detect, but can also be used as a “hardware” transmit inhibit.
Pin 3: When the KAM’98 needs to key your transmitter, it will apply a ground to
this pin. This is an open-drain circuit and requires a positive voltage from your
radio (not to exceed 50 volts or 200 mA).
Connecting to your Radios Appendix A: Advanced Installation
KAM’98 v 8.3 329 User’s Guide
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