I think the variety of type N connectors that don't capture the
center-pin in the body of the connector are the ones that are prone to
failure. On that variety of connector, the center pin is only attached
to the center-conductor of the coax. With wide swings in temperature the
differential CTE of the copper center-conductor relative to the
dielectric causes the center-pin to migrate in and out. If there is
enough differential contraction on the center-conductor, the resulting
tension can cause the unconstrained center-pin to disconnect from the
mating contact. I've seen this happen on long cables terminated with
this type of N-connector.
73, Mike W4EF............
On 8/23/2025 8:39 AM, Wes Stewart via TowerTalk wrote:
Well, I'll fix that. Connector losses are usually overestimated. If they are well
mated, loss is difficult to even measure. But what they introduce is unreliability.
Type N connectors are, in my experience, unreliable when outside with the temperature extremes here
in the desert.
On Saturday, August 23, 2025 at 07:45:48 AM MST, Mike Fatchett W0MU
<w0mu@w0mu.com> wrote:
The silence is deafening.
On 8/23/2025 8:33 AM, Chuck Dietz wrote:
I have been thinking about this myself and I wonder if the connector
between the hardline and the rotor loop might have more loss than the
difference between the hardline and LMR400 ultra flex cable. In other
words, maybe just run LMR400 and not have a connector in line.
I have not done the math, but I think it would depend upon the total length
of the cable. Mine will go from the stackmatch to the bottom of the tower
where it will connect to 7/8” hardline.
Chuck W5PR
On Sat, Aug 23, 2025 at 9:09 AM Jim Miller <jim@jtmiller.com> wrote:
6m beam. i have a rotator loop. this is for the longish boom run.
i've got it all figured out so now to implement.
i had no idea that ferrite beads over 1/2" hardline would be so
controversial.
jim ab3cv
On Sat, Aug 23, 2025 at 8:58 AM Chuck Dietz <w5prchuck@gmail.com> wrote:
Jim, is this for a fixed antenna or a rotating tower? Or, is it for a
rotator loop?
Chuck W5PR
On Fri, Aug 22, 2025 at 5:44 PM Jim Miller <jim@jtmiller.com> wrote:
I found some. In stock. No problem.
Jim ab3cv
On Thu, Aug 21, 2025 at 4:54 PM Jim Miller <jim@jtmiller.com> wrote:
I'm redoing my 6m feed along the boom with LDF4-50 and would like to
put a
string of type 43 cores along it.
Has anyone here done that and what did you find to use? I'd like to
avoid
including a normal piece of coax if possible.
Thanks
Jim ab3cv
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