Question: Has anybody seen any documentation on how electrolytics
perform in a strong rf field? I know that as a decoupler at rf the
usual power supply type is pretty "bum". What about an amplifier which
has insufficient screening between the rf tank and the electrolytic
bank. Many published designs like that. Does this create an extra
form of ripple current in the caps? If so maybe that is why some hams
have problems with caps? Also the placing of electrolytics in close
proximity of the hot tubes surely can't be good engineering?
Some thoughts to ponder on.
John ZS5JF
----------
> From: Richard Carroll <w0ex@scan.missouri.org>
> To: km1h@juno.com
> Cc: amps@contesting.com
> Subject: Re: [AMPS] 470uF/450v caps for $2.25
To: <amps@contesting.com>
> Date: 07 February 1999 07:12
>
>
> They are probably rated for 85 degrees. One should insist on
> 105 degree rated electrolytics for best results and longest
> service life, especially in amplifer power supply service.
>
> Dick W0EX
>
> km1h@juno.com wrote:
> >
> > On Sat, 6 Feb 1999 12:35:49 -0800 "Will K6NDV"
<k6ndv@contesting.com>
> > writes:
> > >ok......SIZZLE and BANG .....
> > >seen a few email about these caps and wonder who installed them
with
> > >good
> > >result.
> > >I just can not belief that these caps. are not meeting any
standard.
> >
> > They do meet a standard and work very well at those levels. Maybe
you
> > just do not realize there are many standards.
> > Just dont expect them ( or any cap) to work way outside their ESR
and
> > dissapation ratings. In many apps they may work quite well even
outside
> > of their ratings...it all depends upon how far you push it.
> > Cheap and small aint often better!
> >
> > 73 Carl KM1H
> >
> > .
> > >Will, K6NDV
> > >
> > >-----Original Message-----
> > >From: km1h@juno.com <km1h@juno.com>
> > >To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
> > >Date: Saturday, February 06, 1999 11:22 AM
> > >Subject: Re: [AMPS] 470uF/450v caps for $2.25
> > >
> > >
> > >>
> > >>
> > >>
> > >>On Fri, 5 Feb 1999 16:09:16 -0800 "Will K6NDV"
> > ><k6ndv@contesting.com>
> > >>writes:
> > >>>Carl, please explain the unpleasant result.
> > >>
> > >>
> > >>>Thanks Will, K6NDV
> > >>
> > >>SIZZLE and BANG
> > >>
> > >>73 Carl KM1H
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>>
> > >>>.
> > >>>>>The catalog price is 10/$40....
> > >>>>>
> > >>>>>73
> > >>>>>Bill wa4lav
> > >>>>]
> > >>>>
> > >>>>
> > >>>>These were mentioned many weeks ago when the ALL ad first
> > >appeared.
> > >>>>
> > >>>>Good luck in using them in high ripple current HV supplies;
> > >>>particularly
> > >>>>voltage doublers. I bought several ( always looking for a REAL
> > >>>bargain)
> > >>>>and tested them in a SB-220...the results were not pleasant.
> > >>>>
> > >>>>73 Carl KM1H
> > >>>>
> > >>>
> > >>>
> > >>>
> > >>
> >
>>___________________________________________________________________
> > >>You don't need to buy Internet access to use free Internet
e-mail.
> > >>Get completely free e-mail from Juno at
> > >http://www.juno.com/getjuno.html
> > >>or call Juno at (800) 654-JUNO [654-5866]
> > >>
> > >>--
> > >>FAQ on WWW: http://www.contesting.com/ampfaq.html
> > >>Submissions: amps@contesting.com
> > >>Administrative requests: amps-REQUEST@contesting.com
> > >>Problems: owner-amps@contesting.com
> > >>Search:
http://www.contesting.com/km9p/search.htm
> > >>
> > >>
> > >
> > >
> >
> > ___________________________________________________________________
> > You don't need to buy Internet access to use free Internet e-mail.
> > Get completely free e-mail from Juno at
http://www.juno.com/getjuno.html
> > or call Juno at (800) 654-JUNO [654-5866]
> >
> > --
> > FAQ on WWW: http://www.contesting.com/ampfaq.html
> > Submissions: amps@contesting.com
> > Administrative requests: amps-REQUEST@contesting.com
> > Problems: owner-amps@contesting.com
> > Search: http://www.contesting.com/km9p/search.htm
>
> --
> FAQ on WWW: http://www.contesting.com/ampfaq.html
> Submissions: amps@contesting.com
> Administrative requests: amps-REQUEST@contesting.com
> Problems: owner-amps@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|