[Elecraft] Microphone Re-wiring Astatic D-104

[hawley, charles j jr]

Well it looks like:
pin 1 of the TT goes to pin 1 of the K3 8 pin MIC +
pin 3 of the TT goes to pin 2 of the K3 8 pin PTT
pin 4 of the TT goes to pin 6 of the K3 8 pin +8VDC for bias if needed
pin 2 of the TT goes to pin 7 of the K3 8 pin MIC - (also GND and I think is connected to pin 7 inside the K3)
shell  of the TT goes to pin 8 of the K3 8 pin GND

The T-UG9 stand data sheet has a warning about using high impedance mics with an amplified stand.
The issues are tinny sound and overly sensitive gain adjust.
The easy fix is to use a resistor 10 times the input resistance of the rig in series with the MIC lead.
Or install a 10 to 1 pad inside the base of the T-UG9 using a 470 and a 4.7K resistor set. 
470 to pin 5 and 4.7K to pin 3 and MIC lead to the junction of the two resistors.

I'm wondering maybe just turn off or bypass the amp in the base. Probably not needed for the K3.

Some links and info for the T-UG8/9

http://www.barovelli.com/projects/radio/radioastatic.htm

http://96.9.26.247/schemi/ACC_microphone/Astatic_UG8-TUG9_wiring.pdf

"T-UG8: Came with a 4-wire cord. The audio wire is NOT disconnected from the mike on receive. This causes a weird, loud squeal on RECEIVE side from some older AM-only radios. The straight mikes that came with those radios all had a switch section inside them that UNHOOKED the audio wire from the mike on receive. The T-UG8 has only a two-section switch inside it, mounted INSIDE the mast. One side keys the radio, and provides the receive-side connection. The other section turns the battery off when you unkey. No easy way to cut the audio wire loose from the audio amp in the mike for receive side. 

T-UG9: Came with a six-wire cord. No radio made since 1980 used more than 5 of them. Go figure. That sixth wire was there for just one brand of radio: Johnson. They used all six wires, but went out of the CB radio business soon after the T-UG9 hit the market. The BIG difference is that the "9" has THREE switch sections inside it. The switch itself is mounted down inside the base, not inside the mast. Most of them will have a "press bar" in addition to the "choker" handle. This one will work with the old 4-pin AM radios without the receive-side squall sounds. That's because that THIRD switch section is attached to the audio wire. The stock setup in the mike is to ground the white audio wire on receive. Clipping one ground wire inside the base makes it compatible with those old "4-pin" radios. Besides, they quit making the "8" a long time ago. The "9" is a newer model, and a used one is probably newer than any "8"." 



Chuck, KE9UW
Lionel Trains, TCA, LCCA, LRRC
aka Jack, BMW Motorcycles BMWMOA #224

________________________________________
From: elecraft-bounces at mailman.qth.net [elecraft-bounces at mailman.qth.net] on behalf of Alan Slusher [aslusher at caribsurf.com]
Sent: Tuesday, November 20, 2012 8:21 PM
To: Elecraft at mailman.qth.net
Subject: [Elecraft]  Microphone Re-wiring Astatic D-104

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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