On Sep 12, 2005, at 7:53 PM, Bill Coleman wrote:
>
> On Sep 12, 2005, at 10:32 PM, Tom Rauch wrote:
>
>> The relay contacts are probably dirty or it is the wrong
>> relay . The AL80A relay should have the NC center contact
>> either removed or bent out of the way.
>
> I'll check this. Mr. Measures suggested reversing the coil wires --
> I'm not sure what good that would do, unless the relay frame has
> become permanently magnetized....
Bingo!
>
> Some one else warned me that I may be hot-switching, since I'm NOT
> using CW PTT. I'm thinking of using the K6XX circuit to speed up the
> relay closure (and slow the release).
PTT does not always cure hot-switching. The cure is blazingly fast
(<2mS) relays closure.
>
>> The spitting is either a bad part like a bad or burnt plate
>> on a capacitor, misaligned relay contacts (the load contact
>> should mechanically close slightly before the input contact)
>> , or you have it loaded too lightly on 80. Sounds like it is
>> loaded too lightly. Open the load control up more.
>
> I've seen this discussion of loading -- what was the definition of
> "lightly" loading? Does it mean there's too much or too little
> capacitance on the loading control?
More C = less loading. Less C = more loading.
>
> Should I favor more or less capacitance here? Seems like the old tube
> rigs I used always started with the loading cap fully meshed, and
> then gradually opened it. But, the SB-401 switched in an array of
> fixed capacitors switched in, so the loading cap barely changed from
> band to band so long as you had a 50 ohm load.
>
> Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
> Quote: "Not within a thousand years will man ever fly!"
> -- Wilbur Wright, 1901
>
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>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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