|[AMRadio] Ranger Audio|
Edward B Richards
zuu6k at juno.com
Tue Nov 14 23:58:18 EST 2006
Maybe the mic is bad. Crystal mics are rather fragile and susceptible to
73, Ed Richards K6UUZ
Simi Valley, Ca 93065
Home of the Air Force 1 pavilion
On Tue, 14 Nov 2006 22:03:03 -0600 Jack Schmidling <jack at schmidling.com>
> 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
> 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
> few things and converted it into a boom mic. I make another contact
> he says tinny but could be his receiver... nice guy. He suggests a
> 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
> mess at the end of the shielded wire is... what is left of a 1m
> I replace all this stuff and it still sounds crummy. Then I find
> R22 is missing in the cathode circuit of the output side of the
> audio. I replace this and it still sounds crummy.
> To establish "crummy" I set the mic near a nice sounding radio and
> up a shortwave receiver in an adjacent room to listen to while
> up a light bulb.
> In all cases, the Kenwood with the handheld dynamic mic sounds
> 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
> on it. I replaced these with 47uf and 67uf caps as that was all I
> 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
> a lack of lows in the audio?
> If not, any other ideas?
> PHOTO OF THE WEEK: http://schmidling.com/pow.htm
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