[NLRS] Please educate me on N jumpers

[Zack Widup]

Hi David,

Do you know what kind of coax is being used in the jumpers? Did the
person who sold them to you say they were rated up to 902 or beyond?

I once used some RG-8 of unknown brand or specs at 432. I was running
400 watts into a dummy load through it. The coax got so hot I thought
it was going to melt. The amp and dummy load were fine with some coax
I knew was good to beyond 432.

Maybe try the jumpers at 144 MHz and see if they work at that frequency?

73, Zack W9SZ


On 7/23/13, David Palm <thepalmhq at gmail.com> wrote:
>
>
> Ok so I had a little misadventure this evening that seems to have turned
> out okay, but has me puzzled.
>
> I bought a 902 transverter just to get us through this upcoming contest.  I
> would prefer to deploy my W1GHZ transverter, but I'm too slow to get it
> working.  That's neither here nor there.
>
> I fired up the boughten transverter and tried to measure its power output.
> I got only a little under 3 of the advertised 10 watts and the reflected
> power was just over 2 watts.  This was into a dummy load good to 2 GHz and
> a Bird 43 meter with 5E element to measure power.
>
> Cutting to the chase, I eventually used my FT-897 and a different Bird
> element to narrow the problem down to jumpers.  I finally found a
> combination of two jumpers (one from rig to meter and one from meter to
> dummy load) that let me determine that the transverter was putting out
> close to its advertised 10 watts and then I was able to tune my WA5VJB
> "cheap yagi" for a perfect match.
>
> The consternation that I feel is that I have now a number of
> commercially-made N to N jumpers that I purchased from a guy on QTH.com,
> that I thought should be perfectly fine, that give me basically infinite
> SWR when connected in this test set-up.  Ohmed out with a DC multimeter
> they check out fine.  Can anyone give me some idea of what might be going
> wrong here and whether I should just throw these in the trash, or whether
> there could be something else going on here?  Any feedback would be
> appreciated.  This was a frustrating evening, although in the end I have
> what I want, a working transverter and a tuned antenna.
>
> Thanks and 73,
>
> David  W9HQ
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