[AMRadio] re: Apache audio not good

[russ dworakowski]

The  unamped  D104  crystal mic  is  the  mic  of  choice,  Need to  install 
a 1  meg or  larger  load resistor  in  the 1st  grid  stage.



>From: manualman at juno.com
>Reply-To: amradio at mailman.qth.net
>To: amradio at mailman.qth.net
>Subject: Re: [AMRadio] re: Apache audio not good
>Date: Wed, 10 Apr 2002 08:43:38 -0700
>
>Your right. The mike element does match the input impedance to the
>internal amp. but there's too much output gain, output impedance mismatch
>to the Apache and now one more "gain" control. It's relatively simple to
>change from amplified to unamplified D104 on the terminal strip under the
>bottom cover. If your creative, you can add a simple dpdt toggle or slide
>switch on the bottom cover to switch from amplified to unamplified
>action.
>Pete
>
>On Wed, 10 Apr 2002 10:28:46 -0400 Gary Schafer <garyschafer at attbi.com>
>writes:
> > A thought on amplified D-104 mikes.
> > Maybe it is better to use the amplified mike! The internal amp on
> > the mike I
> > would think has a high impedance input that the mike element sees
> > unlike what
> > most radios supply. By keeping the gain on the amp at minimum it
> > should not
> > overdrive the radio speech amp? This way the mike element sees the
> > proper
> > termination.  ??
> >
> > 73
> > Gary  K4FMX
> >
> >
> > manualman at juno.com wrote:
> >
> > > Don't use an amplified D104 on the Apache.
> >
> > _______________________________________________
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> > AMRadio at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/amradio
> >
>
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