[Elecraft] [KX3] SWR Reading Instability Follow-up

[Fred Jensen]

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.