View Single Post
  #39   Report Post  
Posted to rec.radio.shortwave,alt.home.repair
Tony Hwang
 
Posts: n/a
Default Want to replace old flat tv cable with better coax.

jg wrote:
I have done some reading about balun transformers and how I can connect
my existing flat antena cable to 75 ohm cable.

However, my questions is this... what if I replace the 30 year old flat
cable all the way to the antenna. Will this yield better reception?
(It is pretty good as it is.) The exiting flat cable is starting to
fall apart at some places. Currently I just have it directly wired to
my coax cable (just before it enters the house) with out any type of
transformer. The coax is properly grounded (to the circuit breaker
box.)

So my questions are these:

1. How do I connect the coax directly to the antenna? Or should I?
Do I still need a balun transformer?
2. If I need a balun transformer, does anyone know of a heavy duty
outdoor one? (Or should I build my own.)
3. Will reception improve?

Thanx to all who reply.

jg

Hi,
Coax impedance is typically ~50 or ~70 Ohm range depending on the type
and it's so called unbalanced feeder vs. twin lead is 300 Ohm balanced.
Balun means Balanced/Unbalanced kinda transformer to keep the impedance
matched for minimum signal loss. Buy good quality coax like Belden brand
and use also good quality weather tight balun. You connect the balun at
the antenna terminal, screw in coax at the other end of balun.
It's done.
Good luck,
Tony