[Premium-Rx] Fw: HF Antennas for the city?

[Peter Rovardi]

----- Original Message ----- 
From: Peter Rovardi 
To: stephous 
Sent: Sunday, November 19, 2006 10:11 PM
Subject: Re: [Premium-Rx] HF Antennas for the city?


Steve,
I can highly recommend one of the Wellbrook Communications loop antennas.( RX Only! )
I use a ALA 100 Active loop which has a circumference of  32 feet (made of wire,& 8 feet/ side ).

It covers from 50kHz to 30 MHz
Intermod;-  2nd Order...-124dBm.
............;-   3rd Order...-137dBm.
(Two sigs of -17dBm at  800kHz +1.0Mhz.)

-Intercept point, typical @ above frequencies and @ 1dB Compression point:-
2nd Order;- +90dBm
3rd Order;- +43dBm

These are the published figures, which I presume are pretty close to actual.

Actual performance, especially on LF is outstanding, as I also had terrible noise problems.
The big plus is it needs to be only at about 6 feet (bottom wire) off the ground.

Regards

Peter  G4HSB.

  ----- Original Message ----- 
  From: stephous 
  To: premium-rx at ml.skirrow.org 
  Sent: Sunday, November 19, 2006 9:28 PM
  Subject: [Premium-Rx] HF Antennas for the city?


  After playing with a number of HF antennas I'm back to where I started, a discone. My lot is 30' x 100'. Traditional HF antennas don't work because the ambient environment is full of noise from power lines, neon signs, fluorescent lights, and wireless networks. The front end gets saturated with noise. Attenuators reduce the noise and the signal until I have performance equal to the discone. One BIG ISSUE, I cannot go more than 5' above the roof line due to local ordinances.

  What I have tried that does not work:
  100' Long Wire
  45' Inverted V
  20' Vertical Loaded

  What I have tried that works:
  WJ 34903 Quad Loop, 13"D x 18"T
  Discone

  I have not tried:
  Horizontal Beam
  Other unique small antennas
  Mobile Antennas
  Discone with HF element???

  Both the WJ loop and a beam are directional so I can null the noise but may also lose the signal when off pattern.

  What other choices have been tried in the city that work? I'm trying to avoid purchasing costly equipment that will not work.  

  Thanks,
  Steve




------------------------------------------------------------------------------


  _______________________________________________

  Premium-Rx Mailing List
  To Post: premium-rx at ml.skirrow.org
  For Info: http://ml.islandnet.com/mailman/listinfo/premium-rx
  Visit the Website: http://kahuna.sdsu.edu/~mechtron/PremRxPage/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/premium-rx/attachments/20061119/8ef49beb/attachment.htm