[Elecraft] Microphone and BFO questions

[vze3v8dt at verizon.net]

My previous email reply was bounced from Rolf (I think).  Here is the short version of my response:

I have the Heil ProSet Plus (normal version, bought last fall, long before I thought about buying a K2).  I also have a Heil GM4 (I think) which has the same HC4 & HC5 microphone elements that are in the ProSet Plus.  I now get great audio reports with both microphones but at first I didn't.  I had to modify the KSB2 by changing R14 from 1k to 10k.  Before I modified it the RF output seemed quite light and there was no reading on the ALC meter, which operates differently than what I was used to with other rigs, but it still didn't operate per the manual for the KSB2.  After the mod I'm getting up to 10W output on all bands and the ALC meter gives 1 to 2 bars as per the manual.  I cannot comment on the Icom mic.

Mark, NK8Q
K2 4786

>From: Geoffrey Mackenzie-Kennedy <gmk at gm4esd.fsworld.co.uk>
>Date: Tue May 10 15:33:06 CDT 2005
>To: "Rolf Moberg, OH6KXL" <rolf.moberg at dnainternet.net>
>Cc: Elecraft Discussion List <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] Microphone and BFO questions

>Rolf,
>
>My K2/100 is #3255 and I use the Heil Proset Plus (normal version) without
>any modifications to the KSB2.  Get full spec PEP on all bands speaking in a
>normal voice which the XYL says is quiet. Sorry I cannot comment on the
>other mics.
>
>73, Geoff
>GM4ESD
>
>----- Original Message -----
>From: "Rolf Moberg, OH6KXL" <rolf.moberg at dnainternet.net>
>To: <elecraft at mailman.qth.net>
>Sent: Tuesday, May 10, 2005 6:15 PM
>Subject: [Elecraft] Microphone and BFO questions
>
>
>> Hello!
>>
>> Does somebody have first hand knowledge/experience from the following
>> topics? I now there are several modifications to KSB2 to increase gain.
>> KI6WX has done a great document how to modify it. It's found in
>>
>> http://home.pacbell.net/johngreb/modifications_to_the_ksb2.pdf
>>
>> My K2 has been on the air about one week now. KSB2 module has not been
>> built not yet. I have two extra microphones to use with K2. The one is
>> well known Yaesu MH-31 with RJ-45 connector in radio end. The other is
>> Heil Pro Set Plus headset with normal HC4 and HC5 elements. I'd like to
>> use BOTH of them (MH-31 and Heil) since there are situations where hand
>> mic is preferred over headset. Heil headset is normal version, not those
>> Icom or Elecraft model.
>>
>> I know there are several modifications to increase gain. My question is:
>>
>> Is it really required to modify KSB2 to get sufficient gain in recent K2
>> versions? My s/n is 4759. Please remember my mics, Heil headset and
>> MH-31. Gain should be adjustable enough to get suitable gain in both of
>> them.
>>
>>
>
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