Thursday, February 17, 2011

Receiving loop antenna for 160 meters



Height of loop above ground is 10 feet. Illustration A is view from above. Illustration B shows 4:l balun and antenna tuner.

One of the problems in working DX on 160 meters is the high level of background noise. Many DXers have found that they cannot use their transmitting antenna for reception - the noise level is overpowering. Paul McClure, KDBSO, met this problem head on and evolved a horizontal receiving loop that provides good signal-to noise ratio. The loop's signal pickup isn't as good as that of a larger antenna, but noise drops off sharply. By adjusting audio gain of the receiver, you can bring the resulting signal up to the original level. Paul says that, out of the noise, he can pull weak signals that didn't seem to exist under normal circumstances. He says the antenna is comparable to a good Beverage wire. The loop, however, takes up less space and there are no terminating resistors to replace after a thunderstorm. The above-ground height of the loop is about 10 feet. It's fed with a random length of 300-ohm ribbon line. Paul twists the line to balance it to ground.

1 comment:

  1. Has anyone else tried this antenna to see how it work? I am considering it for use on 160/80M. It is basically a half-wave loop for 160M. I have some well placed trees that would make it possible if I just add one 10' support. I don't have enough room for a properly oriented Beverage.

    Jerry W5JDF