Matt Warner wrote:

On 10/22/2012 3:56 PM, Egg Salad wrote:
Built a 2m 1/2 wave rooftop (20 ft. up) and am confused about what I
should use to connect it to my Uniden BC 100. have lots of TV cable
but is there something better?

That is fine to use for your scanner feedline. The only time ohms are
important is when you are transmitting.

I don't completely agree with that. Yes, once you get it working it's
not a big issue[*]. But if you have mismatches you have standing waves,
and if you have standing waves you have certain cable lengths that
give you weaker signal levels. So it's still helpful to use a matching
adapter (300 ohm to 75 ohm, for example) where appropriate, and reasonably
high quality coax. The difference between 50 and 75 ohms is probably not
a big deal here, though.

So are 2 meter signals the only things you'll be sending through this
path?
[*] You are probably not looking for long distance reception
(meteor scatter? earth-moon-earth?). For local reception, signal
levels don't matter so much. The receiver has a preamp and automatic
gain control, no doubt.

George