Amps
[Top] [All Lists]

[AMPS] 1296 MHz Power Amplifiers

To: <amps@contesting.com>
Subject: [AMPS] 1296 MHz Power Amplifiers
From: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK)
Date: Sun, 13 Sep 1998 09:45:37 +0100
KM1H wrote:
>New or good used are getting scarce here also. Too many hams are burning
>them out with excessive HV, water jackets, etc.

Most of the failures are due to incorrect loading and no grid current
meter! The output coupling on many 1296/2304 cavity amps doesn't really
work, and hardly ever has a real loading control. And if you look at
published power supply schematics for these amps (eg the N6CA design)
there is never a grid-current meter.

It would be insane to operate a triode HF amp under those conditions,
but apparently it's OK with 3CX100s...

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.demon.co.uk/g3sek

--
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


<Prev in Thread] Current Thread [Next in Thread>