|[AMRadio] Ranger Audio|
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?
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?
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