[Elecraft] Using Heil Pro 7 (HC-7) element with KX3

[Don Wilhelm]

David,

The Heil HC-7 mic element has a very low output level.  Several others 
have had problems with it.  To make matters worse, Heil recommends that 
the K3 microphone gain range should be set to Low, when in fact it needs 
to be set to the High Gain range.

73,
Don W3FPR

On 4/28/2017 8:30 AM, David Wall-NA4AE wrote:
>   I recently tried to use a Heil Pro 7 (HC-7) element with my KX3.  Also, with the Heil adapter cable AD-1-KX3.  Re adjusted the Mic Bias (off) and Mic Btn (off).  Had very poor results.  Could not get the "Echo" out and a basic noise.  Tested extensively using another KX3 and a K3 as the test receiver.  We truly went thru a series of test changing CMP, and EQ. Yes we even cut the MON off.  Could not get the problems corrected with settings.  Sent it back to Heil and they tested it and said it was OK.  Being the good company that they are, they sent me a new system.  It did the same thing. So, I gave up and took it back to HRO.  They refunded me with no problem.  I then ordered a Heil "ProSet-ic" set up for the KX3 from Elecraft. So far it seems to work fine.  I don't know what the problem is that the Pro-7 (HC-7) wouldn't work with the KX3, but there is something that is not compatible with the HC-7 element.  I would have liked to have had a Pro-7 rather than the ProSet, but
>   I couldn't get to work.  The Heil AD-1-KX3 cable is what you need to adapt the headset to the radio with a PL-59 (1/4")connection for a PTT switch (foot,hand etc). also has the TRR plug for the Mic connection.