[TowerTalk] Feedline (choke) question

[Steve Harrison]

On 10/2/2025 10:01 AM, jim.thom jim.thom at 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