[TowerTalk] Ferrite beads for LDF4-50?

john at kk9a.com john at kk9a.com
Sat Aug 23 14:08:14 EDT 2025


I mostly agree.  Connector loss is minimal.  I am all for reducing feedline
loss but to use perhaps 12 feet of Heliax on a 6m beam and then having to
transition to a flexible rotator loop may not be worth the effort not to
mention that LDF4 is more difficult to build a choke with.   The original
post did not mention using N connectors, certainly UHF and DIN can be used
with LDF4-50A.  That said, I used a number of N connectors outdoors at my
station that was dismantled last year.  I only used Amphenol and
Andrew/CommScope connectors and I never had an issue, even in high duty
cycle RTTY contesting at legal limit power.  These days I would use DIN
instead but N connectors are not necessarily terrible.  N connectors used to
be used a lot commercially and they are pretty inexpensive in the surplus
market 

John KK9A


Wes N7WS 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.




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