From: Eric Webner 
Subject: Re: [drakelist] No or very weak audio on TR4

If I'm correct, the KW MC50 is a lowimpedance mic, and you need a
high impedance mic., or I guess you coulduse a small mic
transformer to transform the impedance. The MC50 can showoutput
on the scope, and be working properly, but not into a ckt
thatrequires a high impedance input. You need an older type
dynamic or xtalmic, like an Astatic D-104, or Shure 544 (think
that's the shure nr), orothers. -or find the one that came with
the rig ;-)73,Al, W8UTNew Bern,
NCBoatAnchors appreciated
herehttp://www.hammarlund.infohttp://www.thecompendium.net/radio/http://www.hammarlund.info;-!
----
 Original Message ----- From: "billgoodwin"
To:
Sent: Tuesday, November 02,
2004 12:16 AMSubject: [drakelist] No or very weak audio on
TR4>> billgoodwin
made an utterence to the
drakelistgang>
---------------------------------------------------------------------->
I am trying to get my old TR4 back on the air. I seem to be putting
out> a good rf as shown on my old Philmore SWR meter but
am told that myaudio> is extremely weak and
hardly understandable. I lost the
Electrostaticmic> that came with the rig and
replaced it with a Kenwood MC50. I notice the> manual says
a Switchcraft s-230 plug is "required". The chap who sold
me> the mic did not use this plug. He responded to a
question as to plug> compatibility as
follows>> The plug I used on the MC-50 is
a standard PJ-068 military p!
lug that
 was> used by Uncle Sam on Drake and Collins rigs, and has
worked fine thru> the years. There is a switch on the
microphone itself that needs to be> ON, but I am sure you
know that. I didn't have a Drake rig to check the> mic on,
but did check it on a scope, and there was output
there.>> Can any one help me re
increasing audio signal, mic plug compatibility> or
anything that will help me get a stronger
audio.>> Thanks>
Bill>
KD4FGU>>>>>>>>>
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