I have done away with N-connectors in my VHF EME array as they are failing
during cold winter days. The problem is that at low temperatures (I live at
65.4N...) the center conductor of the coax gets shorter and the center pin
of the N-male is pulled out of the socket hence making poor contact. A
split second of 2kw RF vaporizes the center pin..
After having multiple failures during cold winters I now use PL259/SO239 of
good quality at the relay and as for the driven elements and powerdividers
I have soldered the coax direct and done away with connectors.
I dont think these problems will occur in places where the temperature
swing is somewhat less than -40C -> +35C....
73/Peter SM2CEW
www.qsl.net/sm2cew
At 15:04 2003-09-05 , you wrote:
>It is well known among vhf/uhf operators that N connectors will survive
twice
>legal power through 432mhz with reasonable vswr. Even at 1296mhz they
survive
>full legal power with low vswr.
>
>As others have mentioned, they will fail at any frequency under fault
>conditions. Heck, I even managed to smoke a 7-16 Din connector when the
shield let
>loose on a 1296mhz PA output connection. The screen trip circuit would have
>saved it if I had realized that the fault was external to the PA . You
live and
>(hopefully) you learn!
>
>73/k5gw
>_______________________________________________
>
>See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
>_______________________________________________
>TowerTalk mailing list
>TowerTalk@contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|