Hej all:
I want to collect together a light weight and compact ( low profile to get
into a normal suit case) shortwave station for portable use including a
light weight linear that I have to build myself. Here my thoughts and your
comments are most welcome:
1. Where do I find a light weight HV power supply and why are there no
switched power supplies for 2 -3 kV?
2. As alternative use a number of paralellt cheap russian TV sweep tubes
with filaments in series to get rid of the filament transformer weight. Use
voltage qudrupling straight from 230 VAC mains with a well isolated chassie
to avoid electrical chocks. At the expected 500 W level use an outdoor 500W
SMART TUNER and a long wire.
3. Alternative would be a number paralellt 8072 tubes cooled with flat
volume blowers. Then I get the additional weight of the filament
transformer, of course.
3. Use a DAF that dissipates less heat and requires less cooling and weight.
Which may mean a number of flat light weight computer type blowers.
4. I know there have been similar linears on the market but they are too
heavy.
5. Transistorised linears are out as the cooler adds weight although a
switched power supply is OK.
6. A heavier alternative would be a heavier GU 74 DAF with my QRO HV toroid
transformer. The tubes are very cheap in Europe and reliable.
73s de Hans SM5KI
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|