[WriteLog] Heil proset plus ic and IC756 pro II

[Jerry Pixton <jpixton@shentel.net>]

All Icom owners,

I have always had trouble with weak audio when I started routing my 
microphone (Heil with hc4 dx element) through the sound board for writelog 
to send to the proper radio. I have gotten by on my FT1000mp but it was 
never satisfying on the IC756 Pro II. I even built a mike preamp which I 
used for a while. But in switching computers I left it out.  Finally it 
occured to me that when I was trying to break a dx pile up on voice I would 
always try for a while on the IC756 Pro II and then revert over to the 
FT1000mp (and usually get through then).

The new Heil Proset Plus IC headset has both an electret microphone for 
Icom as well as the hc4 dx mic element with a tiny switch.

After checking the headset directly to the radio, I had enough audio to 
fully drive the ALC level and the Compression to recommended levels - the 
old mike would just budge the ALC with full mic gain.

So I made a adaptor cable from a mono extension cable with 1/8" mono 
male/female connectors. Cut off the male end and replaced it with a stereo 
plug to go into the sound board. Sound boards put a voltage (my new turtle 
beach measures 4 volts, while the Icom puts 7 volts on the mic pin) on the 
Ring while the mic input is on the Tip. I connected the adapter cable 
center wire to the ring (to feed the voltage to the electret element) and 
then put a 1 microfarad cap between Ring and Tip to feed the audio to the 
sound board.

Works like a champ. I have plenty of audio with the sound board controls in 
mid range instead of maxed out. I re-recorded all of my numbers, letters 
plus some number of wave files to use for SS yesterday. Still have to trim 
more off the letter wave files - callsigns are sounded out somewhat slow. I 
left some leading and trailing silence but it is too much still. I am using 
Goldwave to trim the sound files.

Try it, you will like it

Jerry, W6IHG
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Dr. Jerry R. Pixton, PIXOS Designs LLC
http://www.pixos.com/designs/RadioTuner/
jpixton@shentel.net
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