HEIL Proset IC



Heil Proset IC
Having bought Heil ProSet IC which in origin is equipped with two male plugs: 1/8" for microphone and 1/4" for headphones, I was exploring possibility to use it with my radios: IC 7600 (round 8 pin connector) and IC-706 or IC-7000 both with modular type microphone connector. Heli ProSet IC came with AD-1-IC adapter ended with round 8 pin connector so connection to IC-7600 is simple. I should buy adapter with RJ45 on the end as well, but .....
Adapter AD-1-IC has on the one end round 8 pin connector which goes into microphone connector socket on the front panel of IC-7600 and at the other end has two female socckets: 1/4" and 1/8".
The 1/8" socket (small one) has no capacitor in line in order to provide power to mic element - typical Icom solution. The 1/4" socket is used for PTT - since idea of Heil ProSet is "hands free" operation it should be the foot switch unless you are using VOX function during voice operation or CW (in this case no switch is connected to 1/4" socket). The same applied to AD-1-ICM adapter which has modular connector RJ45 instead round one. Sounds complicated but check drawings below and everything will be clear.


Below there is info about connection of Heil Proset IC to IC-7600, IC-7000 and IC-706. In addition you will find info about pin outs and wiring between Heil Proset IC and microphone connector via appropriate adapters.


Heil Proset IC with IC-7600


Headphones connection does not require explanation. Microphone jack is connected with trcv microphone connector through adapter AD-1 IC which has round 8 pins jack on other side. 1/8" connector of AD-1-IC has no capacitor in line in order to supply power to HM-36 microphone. All Icom microphones use the same wire for so called phantom power supply and for mic input - for this reason must not be any capacitor placed in the wire connected to Pin 1.




Heil Proset IC with IC-7000 and IC-706

Headphones connection to IC-7000 or IC-706 should be done through 1/4" to 1/8" reduction since phones connectors in both transceivers are 1/8" in size. Phones connector in IC-7000 is placed on the right side of the head and for IC-706 in the left front corner of the head (see picture for reference). Microphone is connected with transceiver through AD-1-ICM adapter. This adapter has 8 pins modular connector (RJ 45) at the end. As in previous case AD-1-ICM has no capacitor in line in order to supply power to HM-151 or HM-103 microphone. As already mentioned all Icom microphones use the same wire for power supply and for mic input - for this reason must not be any capacitor placed in the wire connected to Pin 6 in a modular connector.

Modular Plug and 8 pin Round Socket
Just information about pin outs of modular plug and 8 round socket. As you can see there are the same functions at pins but they are connected to different pins.
NOTE 1: at Pin 1 in Modular and at Pin 2 in round socket +8 Volts is present. So DO NOT short mentioned pins to ground as this can damage internal 8V regulator.
NOTE 2: at Pin 6 in Modular and at Pin 1 in round socket +5 Volts is present - it is phantom power supply for mic circuit. It is not mentioned in IC 706 manual but IC 7600 manual warns: "DC voltage is applied to Pin 1 (round socket) for microphone operation. Use caution when using a non-Icom microphone".






back to home