On 11/25/2012 12:09 AM, 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
Last Friday I wired an amplified Astatic D-104 with a T-UP9 stand
for my K3. I assume the wire colors are standard . . . if not, then you
might have to dig further. All you need are 4 of the 6 wires in the
cable. Cut off the 4-pin DIN plug and replace it with a standard 8-PIN.
Cut the black and yellow wires off flush as they are not needed. Then
wire as follows:
White (TX audio) - Pin 1
Red (PTT) - Pin 2
Blue (PTT ground) - Pin 8
Bare braid (audio ground) - Pin 7
(See page 13 of the K3 manual for the pin locations)
This works fine on my rig. I have used an amplified D-104 on
various rigs for 27 years (on a TS-940, a TS-450, a FT-847 and an ICOM
PRO3.) I have worked all DXCC entities on SSB except one with a D-104.
Change the 9-volt battery in the base every year or so and you won't
find a better mic for DXing. They got the false reputation of being a
CB mic in the 1970s. This is not their heritage, and they have been
around in the commercial and amateur field since the 1930s . . . Astatic
stopped making them in 2002. However, they are a classic and will work
well with you K2/K3.
Just crack open the amplifier pot on the bottom enough to get a bit
of audio, and then use the rig's mic gain and compression to get the
desired audio. I never used any amplifier other than the stock one in
the T-UP9 base.
So far I have only made 3 SSB QSOs with this, and over 600 CW QSOs
in the contest this weekend. What a fantastic radio, and I've just
scratched the surface!
73, Paul VE1DX (K3 #6949)
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