In a message dated 29/12/2004 10:33:54 GMT Standard Time, sm0aom@telia.com
writes:
When I think about it, the H-1000 was probably only rated to 25 MHz....
There were variants. When used as a drive for the H1200 30kW tx, they were 4
- 27MHz: stand alone as the HS113 (which I believe was the original type
number) they were 4 - 27MHz.
They were one reason that 4CX250Bs were fairly readily available to hams in
Chelmsford - although few people bothered!
I've got some papers from an IEE Conference on HF back in 63, where they
were described. There'a also a paper from STC about a 60kW tx: the variable
inductor in the L match used silver plated copper pipe with air blown down the
inside to cool it, and a wiper of specially made silver loaded graphite. Rich's
advice about providing air cooling for tank coils has some good
precedents....
I don't think there's anybody left making fair sized HF tx's in the UK -
well, maybe some of the UK subscribers to this reflector!
73
Peter G3RZP
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