With magnetic loops becoming more popular, it probably bears commenting:
The AlexLoop [and clones] is a resonant transformer and *must* be at
resonance to work. This means No ATU's, ever. At resonance, the
coupling between primary and secondary is very high and mine works very
well. Off resonance, it becomes an MDL [magnetic dummy load]. A friend
couldn't get his to work and when I saw him set it up, he was adjusting
quickly for a moderate SWR and then letting the ATU match it.
Yes, mine is a bit touchy on 40 meters.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2014 Cal QSO Party 4-5 Oct 2014
- www.cqp.org
On 4/10/2014 1:56 PM, VaibhaV Sharma wrote:
I started paying close attention to the SWR meter after I got the Alex
Loop. The antenna has a very narrow window where the SWR is low (receive
noise high). I try not to use the ATU with the loop.
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