[RFI] Polarization Tests

[JW]

Interesting experiment and thank you for sharing.

1) I would note that the loop's null would be deeper if a shielded (or choked) pickup loop were used. I could not determine from pictures the exact construction, but have seen responses from unshielded loops before (currents on feedlines become a factor.).

2) I worked out an E-field xmit antenna a few years back and noted response of the ends, with unexpected nulls off the *broadside*.  A very quick backyard test of the pattern here; listen to the audible null at broadside from the test receiver (ignore all the noisy birds): (Also recommend playing at half speed)

https://www.youtube.com/watch?v=TxxosnZo0i4


When I first constructed this oddity of nature I noticed that the usual noise sources nulled off the *broadside*, instead of off the ends as the usual 1/2 wave dipole characteristically exhibits

de Jim WB5WPA

PS fo = 7 MHz in above test

      From: Tom Thompson <w0ivj at tomthompson.com>
 To: Rfi List <rfi at contesting.com> 
 Sent: Tuesday, June 13, 2017 12:49 PM
 Subject: [RFI] Polarity Tests
  
Some of you have mentioned in the past about using a tuned loop for 
tracking RFI.  A question has sometimes arose about the direction of the 
null of the loop.  Larry Benko, W0QE, and I did some polarity tests 
using various orientations of both the transmitting short dipole and a 
receiving loop and a receiving short dipole. The results are shown here:

http://tomthompson.com/radio/Antenna_Polarity/Antenna%20Polarity%20Measurements.html

73,  Tom  W0IVJ


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