Hiya Carl
The plug for the TenTec Argonaut 509 is fairly easy to wire. Holding the plug upright the tip is the audio out from the mic', the middle section is the PTT switching line, and the main body of the plug is the ground for both PTT and mic audio.
Not knowing what the microphone was originally wired for leaves us with a problem in that we do not know how it is currently configured, so some detective work is in order.
First of all you may be in luck. Many of the Astatic D-104's had the microphone wiring details on a small sheet of paper glued to the inside of the microphone base, so it might be worth having a look there. You might strike lucky!
After a quick look around the web I came up with a digram which shows the wire colours/pinouts for the D-104 microphone, or at least one version of it. The diagram is below:
OK then, if we assume for now that your microphone is wired the same, with the same colours used, then you would wire up plug as follows.
The white wire from the microphone will go to the plug tip (mic audio out).
The Red wire will go to the plug middle section (PTT).
The blue wire and the shield will go to the plug body (common audio shield and PTT ground).
If your microphone has any other colours etc, then maybe I could work out the wiring from a few photos posted on the forum.
Don't forget that early Astatic D-104's used a ceramic or crystal insert, and if the TenTec Argonaut 509 requires a low impedance microphone then you might need to add a simple buffer amplifier to give the correct impedance match for the '509. From what I can find out, later versions of the Astatic D-104's used a low impedance dynamic insert.
Here is a site with lots of info on the D-104's:
http://www.qsl.net/wa2mzf/d104.html
Hope this info helps,
Mark.
