[Scanner] Re: Which Coax?

[G. D.]

> Any-who....  He is sending me about 65 feet of new RG-59 Coax to use
with it

You can throw that away. 
Or use it on your TV. 


> > why would you want to use coax that is 75 ohms???
 
> For a scanner the impedance difference will have
> no, or at least neglible effect.  Scanners rarely
> achieve anywhere near 50 ohms on their input circuit anyways.
 

For a scanner, the loss due to impedance mismatch, swr, etc. is the SAME
as for a tranmitter.
The advantage is that RG-6 has much lower loss and is a more moderately
priced cable. That's why many are will to sacrifice it.  


> the antenna comes with a 300/75 Ohm balun and 75 Ohm Coax (RG-59) with
"F" connectors

Throw that away, too.
 
> 5 feet up, BUT would require at least 50 feet of coax to reach it.  The
> IS THE EXTRA 11-16 FEET OF HEIGHT WORTH DOUBLING THE COAX LENGTH OVER??

The loss of your typical RG-6 is about 5 db per 100' at 500 MHz. So if
you add 50' to the length, you lose about 1/4 of your signal, plus the
loss through the connectors.


Notice how I snip the unrelated portion of each message so that you don't
wind up with an "e-mail train" sixteen paragraphs long that the rest of
us have to sort through?
Pretty slick, huh?
(Hint, hint)


George





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