There's several ways the wiring in the mike base can be done. There's
two switches associated with the grip-to-talk bar on the T-UG8 base. I
suggest, if not on the inside of mike base, you GOOGLE Astatic D-104
and get a schematic. You will need to use the amp in the base in as
much as the K2 mike input Z is much too low for the mike element. Thus
the amp serves as an emitter follower with gain to provide a proper Z
for the mike element and drive the lower Z provided by the K2 mike
input.{The D-104 element likes to see 3.0 megohms to 4.7 megohms
input Z.}
The mike cable will have two conductors which will be the PTT circuit
and a shielded conductor for the audio.
Schematics will be of great help in figuring out what needs to be done
in terms of wires connected to the terminal strip in the base of the mike.
73
Bob, K4TAX
On 11/1/2015 9:30 PM, Reuben Popp wrote:
Hey everyone, quick question.
I built my K2 over seven years now and just realized I had never completed
the mic section. Granted, I didnt have my ticket at the time, so...
Anyway, I recently picked up a d104 mic with a T-UG8 base (the one with the
adjustable preamp in the base). I have not really verified the wiring in
the base; it looks rather poor in parts, like someone did it with a dirty
iron tip or whatnot but otherwise looks okay.
The mic came with an old four pin connector. The cord itself has three
wires plus the copper braid/shield: black, red, and white. In wiring it
to a standard eight pin female, white went to pin 1, red to pin 2, copper
braid to pin 7, and black to pin 8. On the P2 jumper, I jumpered it as per
the KSB2 manual for Kenwood for AF, PTT, and the two grounds.
That said, on keying the mic, the K2 goes silent but there is no evidence
on the S meter that anything is happening. FWIW I have replaced the 9v
battery in the base and attempted the same after adjusting the preamp pot
to each extreme. Do I need to jumper the other pins on P2 as per the KSB2
instructions? Do I have the female connector wired correctly? Or perhaps
I should revisit the wiring on the preamp and make sure someone else didn't
Bubba it in the past...
Any hints, suggestions or help would be most appreciated.
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