Make adapter cables for some ICOM radios and Headsets with "electret condenser" type mikes.
Channel: Gian Piero de Medici
Date: 2021-05-14

How to make an adapter cable to be used for example with an ICOM 9700 or ICOM 7610 radios and with a headset which has an "elektret condenser" type Mike.


TRANSCRIPT

01-
How to make a DIY adapter cable for an ICOM radio for use with a Headset with an "ELEKTRET CONDENSER" type Mike 

An easy way to understand how to make an adapter cable, if you have not ever made one before, could be to take one apart and look inside.
If you can't do that then this video could help.
Don't forget to read the radio's manual: the pinout is shown there.

02-
First thing, is that you need to know that the mike provided with your radio is probably of the "ELEKTRET CONDENSER MICROPHONE" type, 
these need to be provided with so called "Phantom Power" or "MIC Input DC Bias". 

Your radio could be providing such power by default.

03-
You will need the following:

1a) Jack connector, 3.5 mm stereo with bend protection /  Klinkenkupplung, 3,5 mm, Stereo, 3-pol
and | or
1b) Jack connector, 6.3 mm stereo with bend protection / Klinkenkupplung, 6,3 mm, Stereo, 3-pol

2) Microphone coupler for radio devices, 8-pin / Mikrofon-Kupplung für Funkgeräte 8-polig
3) RG174 Flexible Coax Cable (20 cm for example) / Koaxialkabel RG 174 (z.B.)
4) Shrink tubing (not shown here) - any colour you like / Schrumpfschaluch - Farbe auswählen zur Personalisierung

I didn't receive any money or goods to make this video. Responsibility is yours.

Good luck! 

04-05-
Check the radios manual first to confirm PINs 1 and 7 are used for the mike.
Expect PIN 1 to be the mike's Input, and PIN 7 is the mike's Ground.

The corresponding PINs are marked on the Microphone coupler.

06-07
Cut a the Coax Cable to desired length, try with 20cm for example.
Solder the inner conductor to PIN 1
Solder the shield to PIN 7 / Abschrimung

08-09-10-11-
Add the shrink tubing and unless you are soldering more cables to the Microphone coupler, 
you could add a couple of short pieces of coax cable to allow the Microphone coupler to close tightly and relieve strain.

12-13-14-
Solder the inner conductor to both the round and square holed contacts on the Jack's connector.
Solder the shield to the "sleeve" on the Jack's connector / Abschrimung

Close the connectors / Zusammenschrauben

15-
There are other connections possible, just in case you wish to add more accessories:

PINs 3 and 6 could be used to connect a "frequency memory remote control" for example,
PINs 5 and 6 could be used to connect a push to talk foot pedal,

but first confirm the PIN-out from the manual.

This concludes this video.

Notes:

Released under "Creative Commons", first author: Gian Piero de Medici 14th May 2021