Sounds like a neat program, thanks for link... however with all due respect...I'm thinking the "feedline" is not being referenced. It is the "transmission feedline" the coax that connects the amp to
On 01/21/2015 03:10 PM, Dave Hartman: CRT anode wire used old color TV sets is usually good for 30KV and more Try Belden 8866 www.belden.com/techdatas/english/8866.pdf and a breakdown Voltage of 80,0
160mtrs contest past and we need more power... Plan is to add 3 dB by throwing in another tube (2.5kw anode dissipation tetrode, grid driven). I could go for push-pull of just parallel the tube's. I
I fully agree. I've read many horror stories about hams who installed cheap eBay Asian RF power transistors in their rigs, severely damaging it upon power-up. 2N5686s are 12 bucks at Newark. 2N3771s
I ordered a set of 10 Motorola MC1723CP which cross reference to the stock LM723CN the Astron uses, on Ebay, for all of $5.25 shipped from this seller: http://tinyurl.com/ozwdjhr This was indeed the
I am building a 2x813 class C final modulated by 2x813. The typical way to bias the class C final is with a combination of fixed bias applied to the control grid and bias derived from the rf drive t
I have a pair of jumbo oil filled capacitors. They are each 6 x 6 x 12 inches and weigh about 10 pounds. I wish to use them at 3KV off load and with a 2A ripple current under full load. The only mar
Hi, I believe that not all "distilled water" is suitable for this, you may need to specify "deionised water". The water conductivity needs regular checking, it will rise as it gets contaminated by t
/* snip */ All of the amplifiers I design and use at work are water cooled, some flowing water and some multiphase, or hypervapotron mode, which is the same thing but a trademark. Its not a tough pro
/* snip */ Why are so many hams obsessed with accurate power measurements? Go figure. /* snip */ I don't know, but by all rights (in America) if you want to be serious, if you are charged with the re
-- ORIGINAL MESSAGE --(may be snipped) Measuring RF power accurately is very difficult. Have you ever seen a wattmeter that has been certified calibrated to any standard? No, because it is impossibl
Not meaning to quote anyone in particular here, but what is this insecure fixation with watt meters? Do we want to not break the rules by ten watts? No, I do not care about ten watts over the limit,
I can only think of a couple of situations where an accurate wattmeter matters. I can think of a very fine reason, to prove to the authorities, should the need arise, that you are not in violation o
/* snip */ correlation. A lot of the older existing xcvrs can have their imd improved by increasing their idle current by 30-100% . This doesnt always work..since most older rigs, like my FT-1000D on
Push pull doesn't really buy you anything other than reduced 2nd harmonics, which isn't a problem as the tank circuit will take care of that for ham purposes. It is sometimes used on higher frequenc
Which Japanese HAM transceiver is using LDMOS final transistors? "the famous orange button puts the more expensive and newer model Yaesu radios into Class A." FT-1000Mark 5 FTDX-5000M and perhaps mo
Isn't class A idle current max (tube dissipation) with max signal giving minimum dissipation? (The tube is never driven "into" cut off) Class B is at cutoff while class C is deep into cutoff? No, wi
Isn't class A idle current max (tube dissipation) with max signal giving minimum dissipation? (The tube is never driven "into" cut off) Class B is at cutoff while class C is deep into cutoff? No, wi
--Original Message-- From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of chris@chrishays.com Sent: Thursday, July 09, 2015 6:54 PM To: amps@contesting.com Subject: [Amps] L-C-L vs C-L-C Anot
Semantic, Gary. My e.e. school said it is not a transformer in the classic sense -"trans" as in transforming one voltage/current ratio into another with the added benefit of isolation which the auto