[Scanner] Re: Which Coax?

[Blake Bowers]

> > 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. 
> 
Or use it on your scanner, where it will work just fine.

 
> > > 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.

Again, and I can type slower if need be, the scanner input is
rarely, if ever, 50 ohms.  If that part is not 50 ohms, why 
the big concern if the coax is not 50 ohms?

> > 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.
> 
Figuring 5 db loss for 100 feet (actually 5.1 at 500 Mhz) then your 
loss for 50 feet is going to be roughly 2.55 Dog biscuits.  Closer to
half the signal lost.  

One could use 9913, and get better, LMR400 get even better, but as long
as we have an unlimited budget, 3 inch hardline.  Thats the ticket.  

Use the RG6, keep the run short, and the antenna high.  Enjoy how 
well it is going to work!