Don,
Here is the link to a circuit by Paul, W9AC in response to some
questions I asked several years ago:
http://72.52.250.47/images/D104.jpg or
http://72.52.250.47/images/D104.pdf
This is a single component modification for the D104 and K3.
For a D104 that has been butchered with a Heil HC4 element, the
G3SEK preamp circuit is more appropriate:
http://www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#icom
Note: the K3 handles the HC4/HC5 butchered D-104 without any
preamp when the K3 is configured for FP.H and no bias. However,
the G3SEK preamp permits using the butchered D-104 with a computer
sound card "Line" input when the mic input is unusable because
of internal noise.
73,
... Joe, W4TV
On 11/24/2012 11:09 PM, Don Wilhelm wrote:
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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