On 10/2/2025 10:01 AM, jim.thom jim.thom@telus.net wrote:
If it's hitting 300 deg F..... I would say you are using the wrong
connector !
We were; but we were stuck at the time, conveyed the problem to the
customer, who then poohed-poohed our concerns, claiming that their
existing tube transmitters generating over a kilowatt through the SAME
type of connectors were doing just fine 8-/
Did you use type N on all the connectors that were used, like between
TX and ant ? They would all be cooking.
I really dont know what the customer was actually using from the output
cable to the antlers. As the transmitters were inside a classified
facility, and we didn't even have to have a security clearance just to
produce a new transmitter for them, I never even got to see their old
transmitters, let alone an installation. (And I really, REALLY would
love to have gotten inside and taken a long gander at those old
cavity-tuned vacuum tube transmitters! 8-D )
What are ham folks using for coax and connectors if using 1.5 kw data mode
on the 70 cm band ?
I know NOTHIN' about what anybody uses on "data" mode(s). But on CW/SSB,
almost all American V/UHF operators use nothing more than type Ns; a
very few have, however, followed the Europeans and gone to bigger, such
as 7/16 DINs. But not many, mainly because of the additional cost (not
to mention the difficulty in acquiring them easily). Most Europeans
aren't as schtupid as American hams and have long used something more
appropriate like DINs 8-)
The type N uses that stupid BNC pin..which is way too small.
Are type N connectors even rated for 1 kw CCS CXR on 70 cm band ?
I frankly don't remember now, but I rather doubt it. Those Lunar Link
kilowatt-plus 8938 amps for 432 MHz always made me wonder, though; all
whose pictures of the rear panels that I've seen had type Ns. You will
note that type Ns are typically used on W6PQL's 500+ watt-level
UHF-microwave amplifiers, too 8-O
Steve K0XP
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