[TenTec] TITAN 425 PS maintenance

[Don Jones]

Ditto what Jerry said. 
To do such a mod without a change to the output tank circuit is reckless.
Nice power supply redesign effort but unfortunately this job is only half
done (or baked). Hams have a responsibility to transmit a clean signal that
is not a source of harmful interfere.
I would like to see the two tone harmonics content of the transmitted signal
with pulse rated tubes. I have heard that it requires great RF design skills
to get a pulse rated tube to operate cleanly when transmitting a SSB signal.
But then no one would over-drive their transmitter on our ham bands to break
a DX pile up... no they wouldn't do that...
Then there is the issue of Radiated RF Field strengths and safety...
3500W vs. 1500W = +3.68 gain (or 1/2 a "S" unit).
I fail to see a true value added "return on investment" on this one.

Don Jones KO7i
Arlington, WA 


-----Original Message-----
From: Dr. Gerald N. Johnson [mailto:geraldj at weather.net] 
Sent: Friday, December 03, 2010 1:22 PM
To: tentec at contesting.com
Subject: Re: [TenTec] TITAN 425 PS maintenance



Now there's a slippery slope. Raising the plate voltage and lowering the 
current means a higher load impedance, and so to do it properly means 
redesigning the PI-L network for that higher impedance. 
73, Jerry, K0CQ