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Radio Connections

1,532 bytes added, 2 years ago
[[Media:CDM Cable.pdf|CDM Cable from Kurt Meltzer]] ex-WB9KNX, now KC4NX - Cable 83 has only one output to use for either COS or CTCSS. Use another cable if you need both COS and CTCSS.
The venerable Maxtrac is a radio that was very well built, apparently has very stable reference LO, and can take a beating. When aligned properly, and sufficient *vectored* cooling is made, this radio will last for a very long, time even under several hours with of transmitting per day.
The radio will need to be aligned, and programmed to the frequenc(y/ies) you want to use. You will also need to program the Accessory Option for PL/DPL & CSQ Output.
* Most URIs can accept active high or active low for valid RX signal detection, ie, open squelch. It is HIGHLY recommend in any situation COS is set to USB or active high. This will prevent issues. Too many to mention.
* It is a good idea to program pin 8 on the Maxtrac/GM300 for PL/DPL & CSQ output, active high. This will cause the radio to emit a 5Vdc signal when the squelch is open, and go low when squelch is closed.
===TX/RX audio, COS, and PTT connections===
With the radio facing you in normal operating positing, volume knob on top left, and mic connection right below it, turn the radio over from the right side. The accessory connector is located on the rear, right top of the radio at this point. Starting from left to right, the pins on the top are / and the pins on the bottom are /. If you want to hear audio from the radios speaker, just a header jumper on the far right pins 15 and 16.
This section is a work in progress.
The GM300 section has the link for further reading; the Maxtrac and GM300, are relatively close in design.
[ All about GM300 Radios]
Connections are fairly simple but can be hard to determine which is the correct one to use. This [ link] is a good place to start.

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