[AMRadio] Ranger Audio

[Edward B Richards]

Maybe the mic is bad. Crystal mics are rather fragile and susceptible to
excessive heat,

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>
writes:
> 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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