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The AOR 8200 has an interface port that exposes things such as AGC, audio, control of radio, etc. For example, there is a cable that will allow of control of radio over RS232. There may be other cables out there.
This page describes both a cable to expose all pins on interface as well as a circuit that will "squelch" the always on audio present on one of the pins.
Interface Cable (with USB)
If you search online you will reference to cables with correct connector that can be used with the AOR 8200. However, I purchased one intended for AOR.
When complete, you will have a cable that goes from the radio terminates in a male 9 pin din and another cable that starts with a 9 pin din and ends in a USB connector.
On the cable with the USB connector cable, you can terminate it how you want (for example, bring out the detector output. Alternately, you can make a device that has the 9 pin female connector as an input and break out the pins inside that device.
These pinouts are not for all MkIII radios. See notes below.
AOR 8200 MkIII DIN TTL-231R-3V3
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1 4.2v Red 1
2 TXD White 2 RXD Yellow
3 RXD Black 3 TXD Orange
4 Ground Yellow FRM GND Black
5 +4v(AGC) Blue 4
6 Audio Green 5 audio is always on
7 Mute Brown 6
8 Detector Gray 7 detector output on SFM and NFM mode
9 S-Meter Orange 8
10 AGC Purple 9
FRM Ground Shield FRM (joined with pin 4)
Note: This is the pinout on my AOR 8200 MkIII. There variants out there so you must determine pinouts for your radio. A mistake here could result in destruction of your radio.
Note: Newer MkIII radios not only have a different connector, they have different pinouts. Again, it is critical you do the research on your radio to determine the pinouts for it.
Basic Parts Used
Interface cable (search for part IF8200)
TTL to USB (I used 231 series with stranded ends)
9 PIN DIN Connectors
I couldn't locate the part I ordered. You can
use one with less pins but will not have
all of the capability available.
Audio Circuit
The detector output (gray wire) only works for some bands (not the one I primarily use). The audio output (green wire) works for all bands, but is on independent of signal level.
I wanted audio but only if there was strong signal (breaks squelch). Therefore, I had to use pin mute (brown wire) into a Variable Controlled Amplifier to only pass audio to the speakers when there use signal present.
Circuit Snippet
See attachment for Kicad file.
This circuit was prototyped on breadboard and appears to work well. A radio input and standard line level were prototyped including the mixer section.
Basic Parts Used
References
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