[Amps] "N, " "TNC" and "BNC" connectors are rated at 500 Watts and work at 1, 000 Watts as log as the load is good..

[Roger (K8RI)]

On 11/11/2013 7:46 AM, Dr. David Kirkby wrote:
> On 11 November 2013 08:04, Roger (K8RI) <k8ri at rogerhalstead.com> wrote:
>> With a center fed, sloping dipole, which is far from being a balanced
>> antenna, I have blown Male and the double female connectors by moving 50 to
>> 100 KHz off resonance.  I've also had nearby lightening strikes take them
>> out.

I had several double female Amphenols short out, used for splicing in 
rotator loops and smaller coax feed to the sloping dipoles. They still 
looked like new and I wanted to keep them for examples, so they now have 
a band of red tape around the middle. They look OK and an OM meter shows 
them to be OK, but they won't work even with a 100W on 75 or 40.
The red tape is because the inevitable happened and one found its way 
back into the system.

I forgot to mention the part about being easy to assemble, but fussy 
about dimensions.

Another problem with N type and non captive pins is the coax center 
conductor migration.  This is a problem in vertical runs and feeds to 
sloping dipoles that swing in the wind.

With vertical runs the linear migration can normally be solved with 
LMR-400 and 600 by making a 1 or 2 turn coil just before the connector 
(top and bottom). As long as the radius is not too tight, I've never had 
it migrate in turns

73

Roger (K8RI)

> I suspect part of the problem is that they are often not assembled
> properly. Often the male or female are too far forward or too far
> back, which gives a less than optimal electrical contacts, and I
> suspect thermal contact too.
>