"J M Noeding" wrote in message
...
[snip]

TNX, seems to be the only info available. Could check at the import
agent.
If they stand 55V it means that they will run safe with unstabilized
28V swinging up to 32V under no-load, and the 19" standard-48V to +24V
stabilized powersupplies don't need to fill up my shack, the problem
is only to find transformers suitable for so many 200W Power
amplifiers as I have room for, hi

The equipment is shown on http://home.online.no/~la8ak/d24.htm but
text is in Norwegian because it is limited interest and it is an offer
for the amateur radio groups to collect the hundreds of paging
transmitters if they can take an initiative, many can't, hi


Jan -

The photos you supplied show very nice units. This approach is used in many
of the
solid-state designs for commercial FM (88 - 108 MHz) and VHF television
broadcast transmitters.

You may wish to correspond with JA0TJU. He had several designs based upon
this
bi-polar transistor. Another possibility is to look at W9NUP work with
combining in his 1 kW VHF / 2-meter amplifiers

I always prefer a regulated supply - wide voltage swings introduce other
problems.

Almost all RF transistors follow the following voltage "tiers" (with primary
usage/market)

12 / 13.8 VDC - automobile, portable usage

24 / 28 VDC - aircraft, military usage

48 / 50 VDC - telephone / telecommunications usage

Some prefer the 48 / 50 VDC devices - since it lowers overall current
(amperage) and allow usage of
240 to 120 volt step down transformers -- for stepping down 120 volt to 60
volt in the power
supply circuit.

73 de Greg
w9gb