From: Eric Webner 
Subject: Re: [drakelist] Fw: TR7 Mike Gain


Eric Webner  made an utterence to the drakelist gang
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Hi Bill,
 
I had a similar problem with my Kenwood TS-520 years ago when I replaced
the mic element in my D-104 mike with a Heil. I tried several transformers
to get the low impedance element up to the 50 k-ohm input the radio was
looking for.
 
The final solution was to wire it direct without any transformer. I don't
know if this will "increase" your audio so you don't have to run
the gain as high, but it works great, and the audio is awesome!

73,
 
Eric KA8FAN

Bill Carpenter  wrote:
 
----- Original Message ----- From: Bill Carpenter 
To: drakelist{at}www.zerobeat.com 
Sent: Sunday, January 02, 2005 8:52 PM
Subject: TR7 Mike Gain




I love my TR7 SN 7398 and use it quite a bit.  I replaced the muddy
sounding cartridge in the 7077 mike with a Heil HC-5 element and reports on
audio quality are much better now.  I was surprised that the output of the
mike did not improve.  I still need to run the mike gain at about 3 o’clock
to light the ALC led and get full output on SSB.  Since the HC-5 is low
impedance I wired it through the transformer in the 7077 so it would match
the stock high impedance input of the TR7.  Is it possible to wire the mike
a different way to increase output?  I have heard that later TR7 models
have a second low impendence mike input and maybe that would solve my mike
gain problem?

 

Thanks and 73,

 

Bill NZ0T



		
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Hi Bill,
 
I had a similar problem with my Kenwood TS-520 years ago when I
replaced the mic element in my D-104 mike with a Heil. I tried several
transformers to get the low impedance element up to the 50 k-ohm input the
radio was looking for.
 
The final solution was to wire it direct without any
transformer. I don't know if this will "increase" your audio so
you don't have to run the gain as high, but it works great, and the audio
is awesome!
73,
 
Eric KA8FAN
Bill Carpenter
<NZ0T{at}cox.net> wrote:




 
----- Original Message ----- 
From: Bill Carpenter 
To: drakelist{at}www.zerobeat.com 
Sent: Sunday, January 02, 2005 8:52 PM
Subject: TR7 Mike Gain



I love my TR7 SN
7398 and use it quite a bit.  I replaced the muddy sounding
cartridge in the 7077 mike with a Heil HC-5 element and reports on audio
quality are much better now.  I was surprised that the output of
the mike did not improve.  I still need to run the mike gain at
about 3 o’clock to light the ALC led and get full output on SSB.
 Since the HC-5 is low impedance I wired it through the
transformer in the 7077 so it would match the stock high impedance input of
the TR7.  Is it possible to wire the mike a different way to
increase output?  I have heard that later TR7 models have a second
low impendence mike input and maybe that would solve my mike gain
problem?
 

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