Hi Steve,
So you're saying that the double-gang notch pot on the Corsair I is a
220K? That's about how it measured out with the ohm meter, but it does
say 500K on the schematic. Jerry's right about things showing up on the
case of the pots, but all I saw was what looked to be an OEM part
number or something like it. Please let us know how it goes.
There are a few DDS mods for the oldies out there - like N4YG's mod. I
have a Corsair II PTO that I will be investigating this week. It's kind
of a crap-shoot with those things: The Century 21 I have stays within
50hz after warm-up, but it was rebuilt no so long ago. Going with the
DDS + display combo heads off future problems with the original display,
too. Not a bad idea. I had thought about using a "Huff-and-Puff" or some
kind of fast response phase lock loop on the PTO, but maybe that's not
the way to go.
--
Neal, NL7VL
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On Mon, 07 Feb 2011 12:58:52 +0000
Steve Hunt <steve@karinya.net> wrote:
>Neil,
>
>For some reason I'm not receiving list postings via my email - only
>just found your response on the web archive for the list.
>
>This is a "spare" Corsair I bought very cheaply a year or so ago. I
>only just noticed the pot was very noisy. After rotating it back and
>forth a few times to "clear" it, it stopped working altogether apart
>from the first 30 degrees or so of rotation. Ohm meter confirmed that
>the rear section was going O/C and upsetting the DC conditions around
>the filter.
>
>I just pulled the board and pot out, and I measure the good gang as a
>220k log. I tracked down a replacement locally which I hope will fit
>physically. I'll let you know how it goes.
>
>Incidentally I've just completed the N4YG DDS mod on this radio and am
>very pleased with the results.
>
>Steve G3TXQ
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