|[AMRadio] Ranger Audio|
bmaser at tampabay.rr.com
Wed Nov 15 06:57:18 EST 2006
Put in a new cartridge. I believe they are available from RF Parts.
----- 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?
> PHOTO OF THE WEEK: http://schmidling.com/pow.htm
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