>
> > The extra loss and potential for problems
> > from coax - connector joints, junctions and extra
> > hardware just might shoot your repeater in the foot
> > type thing. A generic rule of thumb might assume each
> > coax connector is about .2 dB of loss added to the
> > system.
>
> You know, has anyone actually measured those losses?
> I've heard all sorts of numbers, from 1dB (insanely high) to 0.1dB.
> I talked it over with a friend, who is a microwave contester, and
> he's thinking it's way closer to the 0.1 number, and maybe lower.
It has to be lower, at least for quality connectors. .1db of loss is
2.28%. This is easy to confirm. On a 180 watt 2M transmitter that I
take care of, .1db loss would dissipate just over 4 watts right at
that connector. That would make it very noticeably warm quite
quickly, yet these connectors stay cool, even after long key-downs.
These connectors are silver plated with Teflon dielectric, UHF type.
Also, somewhere I ran into the following paragraph. I don't remember
where, but I believed it to be credible, so I copied it into the
archives of Good Stuff...
<From the Wirebook IV, pages 3.2 and 3.3
Alan Bloom, N1AL, used an HP8753 RF network analyzer to compare losses
of UHF vs. N connectors.
Both connectors measured 0 db loss up to 100 MHz.
At 150 MHz, the N has 0 db loss, the UHF has .01 db loss.
At 450 MHz, the N has 0 db loss, the UHF has .09 db loss.
Other studies show similar results -- Ed>
Laryn K8TVZ
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