[450] [Spam?] antenna (or feedline) woes

[David McKenzie]

Cohen went up and swapped out the hardline connector and dropped down some
chinese aluminum coax and it looks more reasonable. Upon disassembling the
bottom of the hardline to regular coax i discovered that the N to UHF
adapter I was using appears to be smoked. Hard line might still be OK and I
don't have a need for this barrel anymore but it looks like this may have
been the culprit.


[image: image.png]



On Fri, Oct 6, 2023 at 6:36 PM Robert Busino <n1ujs at toast.net> wrote:

> Noted.
>
> N1UJS
>
>
>
> ------------------------------
> *From*: "David McKenzie" <k1fsy at vhfwiki.com>
> *Sent*: Friday, October 6, 2023 4:50 PM
> *To*: "144.450 Mailing List" <450 at lists.vhfwiki.com>
> *Subject*: [Spam?] [450] antenna (or feedline) woes
>
> I noticed this morning when I returned the meter to its normal position on
> the output of the TE systems amp that I was only getting out about 150
> watts. I didn't check the reverse power immediately but when I put a 25W
> slug in backwards at 100W forward it shot up like crazy. Connected the
> nanovna and sure enough the match is completely screwed (with the tower
> mount preamp off .. which also makes a difference!) Oddly enough I'm
> hearing fine as I was tracking Rich up Rt 8 with no issues, so I suspect it
> may be water intrusion. It doesn't change when i rotate/shake the antennas
> so I don't think it is on the antenna, but it could be the preamp or the
> connection at the preamp that is at issue, or the old hardline, or the
> connection between the hardline and the coax outside at ground level. I can
> check the ground level connectors when the weather is nicer but if it isn't
> that I'm out of luck until my foot is healed well enough to get back on the
> roof. Gonna have to hook the loops back up.
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