Put in a new cartridge. I believe they are available from RF Parts.
Bob W6TR
----- Original Message -----
From: "Jack Schmidling" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
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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