Highfields Amateur Radio Club
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Vertex Standard / Yaesu Microphone Pin Outs.
For: CPU-2500.

Front Panel Microphone Socket:

6 Pin locking ring Pin Signal
connector 1Up
(connect to pin 2 or pin 5 for Up)
2Common Ground
3Down
(connect to pin 2 or pin 5 for Down)
4PTT
(connect to pin 2 or pin 5 for TX)
5Common Ground
6Mic Audio

Keyboard Microphone Socket:

Located on the side of the radio.

20 pin rectangular plugPinFunction
connector1Mic Audio
2Down
3Up
4Column 1
5Column 2
6Column 3
7Column 4
8PTT
9No Connection
10Row 4
11Row 3
12Row 2
13Row 1
14Audio Ground
15Function Ground
16No Connection
17No Connection
18Row 6
19Row 5
20No Connection

Plug Wiring with Keypad Button Layout.
connector C 1C 2C 3C 4
R 1123
R 2456
R 3789
R 4
*
0#
R 5MMRENT
/DL
CE
R 6SET

If making a keyboard Mic yourself note that the rows (R 1 - R 6) have a diode between the buttons and the plug, anode end toward the buttons, cathode toward the plug see schematic below.



mic schematic

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