[AMRadio] Ranger Audio

[Bob Maser]

Put in a new cartridge.  I believe they are available from RF Parts.

Bob  W6TR
----- Original Message ----- 
From: "Jack Schmidling" <jack at schmidling.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Tuesday, November 14, 2006 11:03 PM
Subject: [AMRadio] Ranger Audio


> 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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