[UK-CONTEST] 70mhz 4cx250 amp

[Roger Dixon]

 Andy 
I have one but I will need to take the bottom off to remember the details.
I'll send them to you over the weekend.

Roger-G4BVY

-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com] On Behalf Of Andy Swiffin
Sent: 21 April 2011 09:17
To: uk-contest at contesting.com
Subject: [UK-CONTEST] 70mhz 4cx250 amp

Hi

I know a lot of folks use a single 4cx250 on 70mhz in NFD etc.   Does anyone
here have any design notes, particularly on the input and output circuits.
Despite having two successful homebrew amps for 6 and 2, I'm having
difficulty getting this right for 4M, particularly the input circuit.   I'm
interested in LC details and what RFCs you're using.  

I've tried the input circuit from http://www.qsl.net/g3uvr/4cx250/4cx250.htm
but can't seem to get it to match at all.   

I'm sure I'll get there if I mess around long enough, but I'm a bit
stretched time wise at the moment.   As an alternative, if anyone had a
working 4M amp they no longer had a use for and wanted to sell, I might be
interested!

73
Andy
gm8oeg



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