[Elecraft] Microphones for K2/3

[Bill W5WVO]

Geoffrey Mackenzie-Kennedy wrote:

> Never had a problem John getting full rated PEP output from K2/100
> #3255 using the HC-4 and HC-5 elements in the Heil ProSet Plus
> headset without an external preamp, but I don't use the K2/100's VOX.
> If I used VOX a little more audio gain would be required in the VOX
> circuit, but additional audio gain between the mic elements and
> modulator would result in overdrive. Perhaps my K2/100 is a positive
> tolerance version.

Interesting point, as I have that same issue with my Heil ProSet (HC5) and my 
Kenwood TS-2000. The rig has more than adequate modulation with this mic, but 
not enough gain in the VOX circuit to make VOX usable. Seems to me that the 
gain through these two audio paths ought to be proportionate in a good 
design -- i.e., if max modulation gain is just enough for full modulation, 
then max VOX amp gain should be just enough for effortless VOX operation.

Bill W5WVO

>
> 73,
> Geoff
> GM4ESD
>
>
> John R. Lonigro <johnlon at sbcglobal.net> wrote:
>
>> John and Charles:
>> The Heil Prosets with the HC-4 or HC-5 elements don't have quite
>> enough output to drive the K2 without either an external preamp or
>> tweaking of the K2's internal circuitry.  The version with the
>> electret element seems to work better with the K2.  I believe the
>> Heil K2 Proset is essentially the version with the electret element,
>> but I'm not 100% certain on that matter.
>>
>> All Prosets require an adapter to match your particular mic jack
>> configuration, so that is not a factor.
>>
>> No idea about the K3.
>>
>> 73's,
>> John AA0VE
>
>
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