[Elecraft] Microphone Re-wiring Astatic D-104

[Don Wilhelm]

Alan,

This is the FET mic preamp that I promised.



Alan,

The 4 pin vs. 8 pin is not your only problem. For pin to pin 
connections, I suggest you consult G4WFW microphone connection database, 
it is quite helpful.

The D-104 microphone element is quite high impedance, and some have 
suggested simply using a series resistor to mitigate the high vs. low 
resistance microphone impedance situation, I would suggest that a simple 
FET stage could solve the problem.  The D-104 mic feeds the gate of the 
FET and the output is taken from the source (or drain). There was a web 
reference to the Heil FET amplifier that was recommended, but I have 
lost it.  I have it on my hardrive and will send it to Alan in a 
separate email. -- the reflector will not accept html nor any other 
resential

73,
Don W3FPR


On 11/20/2012 9:21 PM, Alan Slusher wrote:
> Colleagues:
>
> Am looking for assistance in rewiring an Astatic D-104 Astatic microphone
> (T-UG9 stand) for use with my K3 and K2 transceivers. The mic is presently
> wired for 4-pin Ten-Tec.
>
> Any assistance would be greatly, and gratefully, appreciated.
>
>
> Alan V31FA
>
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