Here's what Radio Shack <firstname.lastname@example.org
> sent me today:
Thank you for your email.
The microphone plug for the HTX-252 (cat. no. 19-1127) is a round plug
with pins 1-7 arranged around the edge in a semi-circle, with pin 8 in
the middle. With the empty space below pin 8 on the bottom, the pins
are numbered 1-7 from the bottom left clockwise.
2 8 6
The pinouts are as follows:
1. Microphone Audio / PTT
2. Scan / Pri
3. Down / Up
4. 5 Volts
5. Lock / Shift
6. Call / Step
8. F / MHz
If you have any further questions, please feel free to write us again.
RadioShack Product Support