[Amps] electronic switching

[Steve Katz]

2000V is no problem at all for a pair of PINs in series.  Actually, for such
a high power level as 10kW, I'd recommend at least two in series, maybe
more, in order to achieve excellent isolation when biased OFF.  -WB2WIK/6

"Success is the ability to go from failure to failure with no loss of
enthusiasm." -Winston Churchill

> -----Original Message-----
> From:	2 [SMTP:2 at vc.net]
> Sent:	Wednesday, June 18, 2003 1:10 PM
> To:	Steve Katz; Dr. William J. Schmidt, II; on4kj; AMPS
> Subject:	RE: [Amps] electronic switching 
> 
> >Hi Rich,
> >
> >PINs are readily available to 1000Vpk and of course can be placed in
> series
> >for higher voltage applications.  
> 
> **  Hello, Steve --  For 10kW @ 50-ohms, a minimum piv of 2000v is needed.
> 
> >Remember, a PIN is not a P-N junction
> >device and doesn't really have a "PIV" rating...when biased OFF, its a
> large
> >value resistor and when biased ON, it's a small value resistor....using
> >power devices that can be biased ON with amperes of current, that
> resistor
> >can become *really* small......-WB2WIK/6
> >
> >"Success is the ability to go from failure to failure with no loss of
> >enthusiasm." -Winston Churchill
> >
> >> -----Original Message-----
> >> From:	2 [SMTP:2 at vc.net]
> >> Sent:	Tuesday, June 17, 2003 7:15 AM
> >> To:	Dr. William J. Schmidt, II; on4kj; AMPS
> >> Subject:	Re: [Amps] electronic switching 
> >> 
> >> >Well, we do..... there are diodes that will handle as much as 10kW....
> >> but
> >> >they are expensive.  Harris uses them in their gear...
> >> >
> >> **  What is the piv rating of such diodes, William?
> >> 
> >> >Sincerely,
> >> >
> >> >Dr. William J. Schmidt, II  K9HZ
> >> >
> >> >"Collector of Edison Wind-up Phonographs... Do you have one for me?"
> >> >Email: bill at wjschmidt.com
> >> >Alternate Email: wmschmidt at charter.net
> >> >WebPage: www.wjschmidt.com
> >> >
> >> >
> >> >
> >> >----- Original Message ----- 
> >> >From: "on4kj" <on4kj at skynet.be>
> >> >To: <amps at contesting.com>
> >> >Sent: Sunday, June 15, 2003 2:44 PM
> >> >Subject: [Amps] electronic switching
> >> >
> >> >
> >> >> Hello Folks,
> >> >>
> >> >> About steatite wafers used for band switching.
> >> >> Why dont we see switching systems based on pindiode, for input ( 100
> w
> >> )
> >> >> must be possible nowadays. Even for high output power !!
> >> >> What say ?
> >> >>
> >> >> Jos on4kj
> >> >>
> >> >>
> >> >> ----- Original Message -----
> >> >> From: "Osten B Magnusson" <sm5dqc at algonet.se>
> >> >> To: <amps at contesting.com>
> >> >> Sent: Saturday, June 14, 2003 10:35 AM
> >> >> Subject: [Amps] 572B's WARNING
> >> >>
> >> >>
> >> >> >
> >> >> >
> >> >> > STAY AWAY FROM RICHARDSON ELECTRONICS, ENGLAND      www.rell.com
> >> >> >
> >> >> > 572B's are sold here in Europe by different dealers, the tubes are
> >> >> distributed by Richardson Electronics in England, and they claim
> that
> >> it's
> >> >> Cetron tubes manufactured for National. Sorry to tell, but it isn't
> the
> >> >> truth - it's newly produced Chinese tubes re-badged by Richardsons
> as
> >> >> National and also have ''Made in USA'' printed on them. So be
> careful,
> >> >> before buying. I have been offered, not by Richardsons, but by the
> >> >> distributor to get a full refund if sending the tubes back.
> Richardsons
> >> >does
> >> >> not even answer e-mails...
> >> >> >
> >> >> > This is part of an e-mail from a serious distributor in England:
> >> >> >
> >> >> >      >>Hello Osten,
> >> >> >      >>Taylor is a brand name for RF parts but these can be
> re-badged
> >> >any
> >> >> type!
> >> >> >      >>We have National 572B which are badged by Richardsons which
> is
> >> >the
> >> >> main
> >> >> >      >>outlet for Eimac, but need not be Eimac !
> >> >> >
> >> >> > There are original Cetron NOS 572B's available here in Europe,
> have a
> >> >look
> >> >> at   www.clhi-fi.it   It's in Italian, but click on ''Surplus'' and
> >> than
> >> >> ''avanti'' to go to page four. There are no prices on the WEB, but
> in
> >> an
> >> >> e-mail they asked 500 ''euros'' for a matched pair, plus postage.
> >> That's
> >> >> totally USD 645 for a matched pair!!!   I know that there are also
> NOS
> >> >> Cetron 572B's available in USA, but unfortunately we have to pay
> more
> >> >> postage, customs, 25 percent VAT etc. so here we always try to buy
> from
> >> a
> >> >> European Community country, this was no customs and other extra
> charges
> >> to
> >> >> pay.
> >> >> >
> >> >> > Probably time to get all ''glass tubes'' amplifiers marked
> ''junk''
> >> and
> >> >in
> >> >> the future only get amplifiers with ceramic tubes!
> >> >> >
> >> >> > 73 de Osten SM5DQC    e-mail:  sm5dqc at algonet.se
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> > _______________________________________________
> >> >> > Amps mailing list
> >> >> > Amps at contesting.com
> >> >> > http://lists.contesting.com/mailman/listinfo/amps
> >> >> >
> >> >> >
> >> >>
> >> >>
> >> >> _______________________________________________
> >> >> Amps mailing list
> >> >> Amps at contesting.com
> >> >> http://lists.contesting.com/mailman/listinfo/amps
> >> >
> >> >_______________________________________________
> >> >Amps mailing list
> >> >Amps at contesting.com
> >> >http://lists.contesting.com/mailman/listinfo/amps
> >> 
> >> 
> >> Rich, AG6K, 805-386-3734, www.vcnet.com/measures
> >> 
> >> _______________________________________________
> >> Amps mailing list
> >> Amps at contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >
> 
> 
> Rich, AG6K, 805-386-3734, www.vcnet.com/measures