Heil clearly states the HC and GM microphones will not work with
the IC-706 which was Rag's question. See:
http://www.heilsound.com/amateur/icom_fix.htm and note:
> The IC 706 will NOT work well with our HC or GM elements, as
> the 706 is short on mic preamp gain, so you need to solve the
> low audio problem with one of the new Heil "iC" products.
A blocking capacitor and dynamic element work just fine with the
"Pro" series radios that have microphone preamplifier gains comparable
to the radios from Yaesu, Kenwood, and Ten-Tec designed for dynamic
mics. However, the older Icom radios still require a Heil "iC"
series (electret) mic element.
... Joe, W4TV
> -----Original Message-----
> From: email@example.com
> [mailto:firstname.lastname@example.org] On Behalf Of Bill Turner
> Sent: Wednesday, March 22, 2006 11:17 AM
> To: Stein Roar Brobakken & LA6FJA/KI4KJP
> Cc: RTTY@contesting.com
> Subject: Re: [RTTY] I resolved this about MK-8-IC cable on
> OPC-599 for IC706
> ORIGINAL MESSAGE:
> At 09:06 AM 3/21/2006, Stein Roar Brobakken & LA6FJA/KI4KJP wrote:
> >Now I only need to find out why the Heil headset dont
> modulate good out on
> >my 706... do you have a idea about adding caps in serial
> with mic element=?
> *********** REPLY SEPARATOR ***********
> The Heil website has a good discussion about using their mikes with
> ICOM rigs. In most cases, you do need to add a capacitor in series
> with the mike.
> 73, Bill W6WRT
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