can you use a step up audio transformer to increase the impedance to the
microphone from the radio?
I am guessing the 830 likes to se a 600 ohm microphone attached, so an audio
transformer stepping up to around 1meg ohm might make the D104 play a little
better.
I would think you could accomplish this with some sort of Pot and resistor
combination instead of of an OP amp.
73
Colin, V A6BKX
----- Original Message ----- 
From: "Lou Kolb" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, December 31, 2007 2:43 PM
Subject: Re: more ts830 for Lou


> Thanks Keith.  I have the rig now and am getting used to it.  Lots more
> knobs than the 440 but it's working well.  I'm using the 25 khz calibrator
> and It's amazing how spoiled you can get by direct frequency input and
> audible frequency readout.  But the receiver sounds great.  Transmit audio
> reports have been good too.  What I'd like to do with this rig is get a
d104
> with one of thos op amp modifications so the mic is properly matched.  The
> D104 likes to look into at least a megohm and when it does it sounds quite
> good, not the scratchy sound most folks identify with it.  Lou
> ----- Original Message ----- 
> From: <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, December 31, 2007 9:16 AM
> Subject: more ts830 for Lou
>
>
> > Further to my message of yesterday, I forgot to mention that, if you
> > have the original tuning knob, then each turn gives you 25 kcs.
> >
> > At the ends there is a definite stop so you cannot turn the knob
> > beyond that point so you will see it is easy to count and get close to
> > the wanted frequency.
> >
> > Keith
> > gw4nby
> >
>
>
>
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