This is good to know. Thank you. I am wondering why my 6 pin
Mini-DIN is not working with this cable as it works on other radios.
Chris KQ6UP
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On Fri, Oct 27, 2023 at 7:20?AM Steve W3AHL <w3ahl@...> wrote:
Chris,
Two issues to be aware of when using the 13-pin DIN ACC input:
The audio input on pin 11 is much more sensitive (100 mv.) than the DATA connector. Even with good ferrite chokes on the cable, it is susceptible to picking up RFI, which distorts the audio, especially when used in portable operation with less than ideal antennas and station grounding. The solution is to put a 68K resistor in series with pin 11 inside the DIN connector shell. This increases the audio input level closer to 2 volts, which decreases the effects of any RFI and also makes level adjustment less touchy with most sources. This is especially important for SCS Pactor units.
When using the ACC port, its audio input on pin 11 goes to the same input bus as the external mic connectors on the front and rear panels. If a mic is plugged into either port any noise in the room picked up by the mic will be mixed with the data audio, causing data errors at the receiving station. The only solution is to always unplug the mic's when using a digital mode via ACC. The DATA port does not have this problem.
Steve, W3AHL
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Thanks,
Chris Maness
