Have wondered about this myself.
A toroidal 230v-230v isolation transformer 500w CCS would not weigh too
much. Voltage double/quadruple to sweep tubes. Series filaments with say 6
x PL509 to give 240v filaments.....
May be able to feed screens from quarter/half volts point in supply and use
passive grid. Maybe series tune output circuit?
73
end
Barry Kirkwood PhD ZL1DD
Signal Hill
66 Cory Road
Palm Beach
Waiheke Island 1240
NEW ZEALAND
www.waiheke.co.nz/signal.htm
----- Original Message -----
From: sm5ki <sm5ki@algonet.se>
To: <amps@contesting.com>
Sent: Sunday, 29 October, 2000 10:53 PM
Subject: [AMPS] Portable linear using a DAF?
>
> 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
>
>
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|