[Central-Electronics] 100V AF phase shifter

[K6JEK]

Great stuff.   I intend to follow everyone's advice and look for 
simpler solutions first.   I replaced the mod caps when I first 
resurrected this long abandoned 100V.  I doubt they are the problem.   
Who knows?   Maybe I just need to tweak a couple of pots.    Or maybe 
it will be at the other end of the spectrum like Russ's and I'll have 
to take apart the cans and look for weird little things.

Thanks, everyone, for the suggestions.

Jon, K6JEK


On Dec 3, 2006, at 9:16 AM, Russ WQ3X wrote:

> Most of the time the components are fine. The biggest problem on my 
> own 100V was broken solder joints where the stiff wires from the 
> socket plugs connect to the single-sided PC boards inside the module 
> cans. Also there can be shorting of the PC board solder-side component 
> leads to the metal can bodies. I found 11 different problems all 
> because of this stuff on my 100V when I got it causing poor unwanted 
> sideband suppression. This was in addition to an unsoldered joint from 
> the factory on the mode switch. The previous owner had paid well over 
> $1000 to have this unit "restored". Evidently the cans had never been 
> taken apart by this expert. It was a mess in there and sure didn't 
> work!
>
> I would not worry all that much about the .1% accuracy. Chances are 
> the component is either fried or not, and normal ham test equipment 
> should find the problem if any exists.
>
> I use a 2-tone generator and spectrum analyzer to check and adjust 
> sideband suppression. (It came with the 100V when I got it and turned 
> out to be very useful!)
>
> 73, Russ WQ3X
>
>
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