[Central-Electronics] 100V AF phase shifter

[Dennis Petrich]

Years ago I talked with Joe Bachelor, the inventor of the 100V coupling
coils and designer of the 100V along with Wes and he said the values in the
audio phasing module have to be matched to within 1% but that the absolute
values can be within 5%.  Those little LC meters can match to better than
1%, and that's all that counts.

Hope that helps, Dennis, k0eoo

-----Original Message-----
From: Bob Sullivan [mailto:robert at isquare.com]
Sent: Sunday, December 03, 2006 8:13 AM
To: Dennis Petrich; 'K6JEK'; central-electronics at mailman.qth.net
Subject: RE: [Central-Electronics] 100V AF phase shifter


I wish it were true but those little LCR meters - which are wonderful for 
many applications - are not very accurate. For example the little Tenma (a 
bit more than $100) has measurement accuracy of around +/- .75 to 1%!

73, Bob
WØYVA
Personal site: http://www.isquare.com/personal_pages/ras-hardware.htm


At 07:13 AM 12/3/2006, Dennis Petrich wrote:
>You should be able to use one of those hand held LC meters available these
>days for <$100 bucks....
>
>-----Original Message-----
>From: K6JEK [mailto:k6jek at comcast.net]
>Sent: Friday, December 01, 2006 11:42 PM
>To: central-electronics at mailman.qth.net
>Cc: Bob Sullivan
>Subject: Re: [Central-Electronics] 100V AF phase shifter
>
>
>Bob,
>
>I  took the liberty of posting your response to the reflector since
>others seem to be interested.   That's about what I expected --
>calibrated lab grade equipment.   I'm heartened to hear that the PS-2
>isn't likely the problem.
>
>I'm actually in procrastination mode.   I seem to have lousy opposite
>side band suppression.   I'm thinking about the problem rather than
>doing anything about it -- avoiding hoisting the 100V from the
>operating position to the work bench.   Hoisting is next.
>
>Thanks,
>
>Jon, K6JEK
>
>On Dec 1, 2006, at 6:44 PM, Bob Sullivan wrote:
>
> > Jon,
> >
> > I do a lot of 100V/200V restoration work and infrequently the PS-2
> > requires attention. Most hams don't have the equipment to measure to
> > that accuracy which requires a high-end LCR meter or bridge that has
> > been calibrated. An example would be the GenRad Model 1692. The
> > (fairly) good news is that older versions that sold for 10K and up are
> > now available for a fraction of that cost.
> >
> > When was the last time you sent a piece of test equipment to a
> > calibration lab? Hi.
> >
> > 73, Bob
> > WØYVA
> > Personal site: http://www.isquare.com/personal_pages/ras-hardware.htm
> >
> >
> >
> > At 09:05 PM 12/1/2006, you wrote:
> >> How do you work on the audio phase shift module?   It's full of
> >> resistors and capacitors "bridged to within .1%"   How do you measure
> >> capacitors and resistors that accurately?
> >>
> >> Jon, K6JEK`
> >>
> >> _______________________________________________
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> >> Central-Electronics at mailman.qth.net
> >> http://mailman.qth.net/mailman/listinfo/central-electronics
> >>
> >
>
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