[Lowfer] Loop Practice ?

[Mike WE0H]

What about having a switch box for all the rotator wires so you could 
open all wires when not needing to move the rotator? If they were 
floating open, would they not induce noise in the RX loop or would it 
still be trouble with them running out so close to the loop?

Any chance of seeing the portable SLM schematic? I can make a board 
layout for it for etching boards.

Mike
WE0H


Bill Ashlock wrote:
>  
>   
>> The null when using all 14 turns was about 21 dB, but it dropped to 17 > dB when only 7 turns were used.
>>     
>  
> Interesting measurement, John! Here we are back at the need for a portable SVM so you can adjust as you watch :)  One can even rotate the plane of the loop in the axis pointing toward the signal source to achieve and even deeper null - sometimes as low as 40 db if the loop is well balanced. 
>  
> Oh, BTW, your comments bring up another point: Why is it that few use rotators, in fact cheep ones, to rotate their loops? In my case I think I drifted away from using rotators even though I have accumulated many of then through the years, because of the overall loss in performance... mostly S/N. Now I realize that the rotator cable must have been the culprit - bringing noise from the shack ground system out to the antenna site... same as using a lead-in without a coupling/isolation transformer in the shack. Suppose winding a sufficient number of turns of the rotator cable on a high-perm core would take care of this problem.
>  
> Bill