Phil-
I've been looking at GS35B as well. HF vapor cooled with homebrew boiler.
Who wants to listen to 500lpm fan noise :-)
Could you share some references to the guys running at 4 to 4.5kV.
I was thinking 3.5kV would be pushing things.
Use a choke input and your tranny is perfect for this voltage. Regulation
will be
much better as well.
Scrounge or wind.
I'm gonna ask list about inductance of microwave oven transformer, used as
choke...
-bob
----------
| From: Phil <philhss@breathemail.net>
| To: Amps <amps@contesting.com>
| Subject: [AMPS] HV PSU Question
To: <amps@contesting.com>
| Date: Monday, January 01, 2001 1:12 PM
|
|
|
| Gentlemen,
|
| I posted to this reflector late last year with a query regarding using
the
| DJ5RE design with a GS35b on 144MHz - with great success! I am happy to
| report that the project is coming along just fine, with the only problem
to
| date being the acquisition of suitable finger-stock to make a 'socket'
for
| the tube. I know I can do this by other means, but I'd like to take this
| route...
|
| However, this is not the point of my posting.
|
| I'd like to feed the anode of the GS35b with 4 to 4.5Kv DC. Many others
have
| had great success with this level of voltage on the anode so I've chosen
| this as my goal.
|
| I've managed to get my hands on an HV Transformer which features a
| 3950-0-3950 secondary, and a 10-0-180-200-220-240 primary. The only ID on
| the unit is "M.E.P. M1921 SR/T 2468".
|
| The question is: How do I tame the beast so as to provide the required
level
| of DC from a 240v AC supply?
|
| I immediately thought of placing a 240/110 transformer in the primary to
| feed the 'main' transformer with 110v onto the 240 primary tapping. This
| would be fine, except that sourcing such a transformer in the UK has
proven
| difficult.
|
| So, a friend has suggested using a full-wave rectification setup with a
| filter choke - but by my calculation this requires a choke of some 5H or
| more! How do I build such a choke, or where can I purchase one?
|
| Maybe you know of a better way? Any help/suggestions would be greatly
| appreciated.....
|
| Happy New Year, Chaps!
|
| Phil Smeaton
| G0HSS
|
|
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