[UK-CONTEST] BNOS Amplifier Information

[Giles Herbert]

Seasons Greetings from Gloucestershire,
 
I have tried to gain such information via a friend of mine who knows one of the BNOS Organisation staff of the era and was unsuccessful.  I have an amp where the rf switching has lost the hang time constant and it would be of interest to me too if any details were available in due course.

Giles Herbert
G0NXA
Often on 3.716 MHz



 
> From: member at g4dhf.freeserve.co.uk
> To: uk-contest at contesting.com
> Date: Thu, 16 Dec 2010 11:08:02 +0100
> Subject: [UK-CONTEST] BNOS Amplifier Information
> 
> Season's Greetings, 
> 
> This request is directed toward the U/VHF community. It may be slightly OT but directly related to the UKAC events.
> 
> Does anyone have any circuit information for the BNOS U/VHF amplifiers?
> 
> I'm using 100W "bricks" in the Restricted Sections on both 2M and 70cm along with my K3/P3 and transverter combination and need to modify the hard switched PA delay times. The actual RF circuits are quite straightforward and I've repaired several amps. What is more difficult, however, is tracing the bias network and protection circuitry. A search on the Internet reveals more requests for information than answers. I seem to remember someone was selling circuit details on eBay over the summer so information is available somewhere. I suspect that much of the information will be generic from one BNOS PA to another even though the operating frequencies and model numbers may vary. If anyone has any circuit information on any of the amplifiers I'd appreciate a response to my email address. I could even post it on my web site so it could be shared.
> 
> 73, 
> David
> G4DHF
> 
> david at g4dhf.freeserve.co.uk
> 
> www.g4dhf.com
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