TheRadioBoard

Hi Guys,

I stumbled onto this while doing a Google search for something unrelated. That happens a lot, and it has taken me to some interesting sites!

http://www.engineeringradio.us/blog/201 ... r-antenna/

Is this truly a uni-directional loop with just one lobe? I've not seen anything like it before.

73, J.B., VE3EAR

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To be where I am, I had to leave where I was!

Take a look a the K9AY, "Flag" and "Pennant" loops, which are all over the web. Same idea, might work better across the band.

73,

_________________

http://kr1s.kearman.com/
http://qrp.kearman.com/

Jim,

I can't see the connection between the "monitor antenna" and the ewe, flag or pennant antennas. The latter are only single turn loops, which are terminated with a resistor, and the enclosed area of the loops is much larger.
The part that I question is that the configuration supposedly produces a loop with only one lobe, rather than the figure-eight pattern of virtually every other multi-turn loop that I've ever encountered.

73, J.B., VE3EAR

_________________
To be where I am, I had to leave where I was!

My guess is that he was trying to make the loop dimensions shorter by using multiple turns. If you look at the second drawing, it represents the loop as a single turn, and from that perspective it resembles a K9AY. Replacing the 500-pF cap with a 200-ohm resistor (K9AY antennas use variable resistors to set front-to-back ratio for a certain band of frequencies) would probably make this one work better across the MW BCB. He only cares about 770 kHz. This antenna might be a good option for DXing, as it could be turned with a TV rotator.

73,

_________________

http://kr1s.kearman.com/
http://qrp.kearman.com/