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Audio Output
The output audio is supplied to the AUDO pad through a 10 µF capacitor. It is sufficient
to drive a speaker, headphones, or the audio input of a transmitter.
Push-To-Talk (PTT)
The PTT input is active-low (ground for PTT) and is taken from J_ID pin 4. It is coupled
through a 2.2K resistor to the AUDO output. This arrangement is used for a combined
mic/PTT input on many handheld V/UHF transceivers from Yaesu, Alinco, Icom, ADI,
Radio Shack and several other manufacturers. If you do not wish to combine PTT and
audio, omit resistor R3 and use the solder pad marked PTT.
J_ID Connections and PCB Layout
Connector J_ID is intended to plug directly into the corresponding connector on an ID-O-
Matic, but can be used in other applications as well. The connections available are as
follows:
J_ID 1
No Connection
J_ID 2
INHIBIT output
J_ID 3
START output
J_ID 4
PTT input
J_ID 5
No Connection
J_ID 6
Ground
Connection Kit Manual
04/18/2008
Page 4 of 4
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