[AMRadio] Ranger Audio


Rick Brashear rickbras at airmail.net
Tue Nov 14 23:08:05 EST 2006


Jack... are you sure you have C59b hooked up with the positive side 
going to GROUND?

Rick

Jack Schmidling wrote:

> So I get my new D104 yesterday and spend a few hours removing the 
> un-needed junk from it and fire up for the NoonTime Forum expecting 
> all sorts of kudos and no one can hear me.  One guy that could said it 
> sounded tinny and crummy.
>
> So I switch to the Kenwood and they all say wonderful.
>
> I went of over the whole mic again, plugs, wires, grounds and fixed a 
> few things and converted it into a boom mic.  I make another contact 
> and he says tinny but could be his receiver... nice guy.  He suggests 
> a few caps to check   so back to the bench with it.
>
> After looking around, I find that the mic wire goes directly to the 
> grid, no resistor divider and no input cap.  I now see what that 
> strange mess at the end of the shielded wire is... what is left of a 
> 1m resistor.
>
> I replace all this stuff and it still sounds crummy. Then I find that 
> R22 is missing in the cathode circuit of the output side of the first 
> audio.  I replace this and it still sounds crummy.
>
> To establish "crummy" I set the mic near a nice sounding radio and set 
> up a shortwave receiver in an adjacent room to listen to while loading 
> up a light bulb.
>
> In all cases, the Kenwood with the handheld dynamic mic sounds better.
>
> The only thing (I have said this many times) that I see left as a 
> possible problem is C59a/b.  These were resistors when I started 
> working on it.  I replaced these with 47uf and 67uf caps as that was 
> all I had left at the required WV.  They are supposed to be 15mf.
>
> I am not sure just what these do so the question is... could these 
> cause a lack of lows in the audio?
>
> If not, any other ideas?
>
> js
>




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