From: "Al Parker" 
Subject: Re: [drakelist] No or very weak audio on TR4


"Al Parker"  made an utterence to the
drakelist gang
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Hi Bill,
    The plug is OK, same as the switchcraft as far as dimensions, etc. are
concerned.  The problem is the mic.  If I'm correct, the KW MC50 is a low
impedance mic, and you need a high impedance mic., or I guess you could
use a small mic transformer to transform the impedance.  The MC50 can show
output on the scope, and be working properly, but not into a ckt that
requires a high impedance input.  You need an older type dynamic or xtal
mic, like an Astatic D-104, or Shure  544 (think that's the shure nr), or
others.  -or find the one that came with the rig ;-)
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info


----- Original Message ----- 
From: "billgoodwin" 
To: 
Sent: Tuesday, November 02, 2004 12:16 AM
Subject: [drakelist] No or very weak audio on TR4


>
> billgoodwin  made an utterence to the drakelist
gang
> ----------------------------------------------------------------------
> 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 my
audio
> is extremely weak and hardly understandable. I lost the Electrostatic
mic
> 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 plug 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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----------------------------------------------------------------------
On Behalf of "Al Parker" 
Submissions:        drakelist{at}www.zerobeat.net
Unsubscribe:        majordomo{at}www.zerobeat.net - unsubscribe drakelist in body
Hopelessly Lost:    majordomo{at}www.zerobeat.net - help in body of message
Zerobeat Web Page:  http://www.zerobeat.net
Brought to you courtesy of TLCHost.net  http://www.tlchost.net/
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