Re: Digest Number 1053

Thanks Dave. That clears is up! In fact, I ran my long wire to the coax junction box outside and then to the house using the pre-wire and the results are good. Not perfect, but good!

Amir./
  ----- Original Message ----- 
  From: Dave Martindale 
  To: [email protected] 
  Sent: Monday, September 20, 2004 9:30 AM
  Subject: Re: [icomr2] Digest Number 1053



  >Thanks for the reply, Dave. This is great info.  Could you clarify what you mean by "If there's nothing but coax between the antenna and the scanner"  You mean other devices? Splitters?

  Splitters, amplifiers, filters, anything but coax, since these devices may 
  pass only a certain frequency range, or pass signal only in one direction, 
  or pass nothing at all unless supplied with power.

  >Also, I wanted to ask one more question and that is:  Can you also use the pre-wire house coax to bring in signal from a random or long wire copper antenna for sortwave?
  >
  >The ICr2 covers shortwave and I wonder  if the signal could be brought up cleanly into the house that way.

  You can try it, but it may attenuate the signal.  The antennas normally used 
  for VHF and UHF are low-impedance designs with a feedpoint impedance 
  somewhere near the 75 ohms of the cable, so they will couple signal nicely 
  into the cable and the cable will carry the signal with relatively low loss. 
  But HF antennas are usually a "long wire" that's only a tiny fraction of a 
  wavelength, which provides a high-impedance signal.  This won't couple into 
  a piece of coax very well, and the coax will act like a capacitor to ground 
  attached to one end of the antenna (unless you use an antenna tuner between 
  antenna and coax).  If the coax length is short compared to the antenna 
  length, this may not matter much, but a long coax run is likely to be a 
  problem.

          Dave 



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