From: Mahlon Haunschild 
Subject: Re: [drakelist] No or very weak audio on TR4


Mahlon Haunschild  made an utterence to the
drakelist gang
----------------------------------------------------------------------
The Kenwood MC-50 is convertible lo-hi impedance; just have to 
remove/reinstall the plug in the connector on the back of the microphone 
appropriately.  Look at the black & red color dots & the
"H" or "L" next 
to them.  This is one of the reasons that I keep one of these very 
useful (and good-looking) microphones around.

regards,

Mahlon - K4OQ

Eric Webner wrote:

> Shure mic that was so popular: the 444.
> 
> Al Parker  wrote:
> 
> 
>     "Al Parker" made an utterence to the drakelist gang
>     ----------------------------------------------------------------------
>     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 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
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>      >
>     ----------------------------------------------------------------------
>      > On Behalf of billgoodwin
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>     ----------------------------------------------------------------------
>      >
> 
> 
>     ----------------------------------------------------------------------
>     On Behalf of "Al Parker"
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