[Lowfer] Loop-D-Loop

[Mike WE0H]

http://www.we0h.us/505kc/RX-Loop/Portable-RX-Loop-small.jpg

That's my latest antenna build. Of course it would work nice with a 
homebrew portable SLM...

Mike
WE0H


Bill Ashlock wrote:
> Peter,
>  
> John is basically correct in saying that elevation is not a factor - and who would doubt his excellent record of weak-signal catches. There are a couple of exceptions in loop receiving that I have noted. First, if there are any buried wires, connected or not connected, anywhere near the loop, they will tend to radiate signals (often interference) to the loop. So in this case raising the loop will help S/N. I highly recommend the technique of walking around with a 3' loop (a size that one can handle) and portable SVM (here we go again Mike :), or even your main receiver on an extension cord, to determine the lowest noise location. Secondly I have found that in the case of deep woods looping that nearby trees can have a small effect on the loop null. Tall trees can be modeled as high resistance vertical antennas, low performance ones at that, which have a associated E-field and H-field around them.
>  
> And another two cents worth of comment: I wish someone would do a careful investigation into the effect of receiving loop size in the 3' to 10' range for very weak signals. This would have to be a Bill Bowers type of very careful investigation similar to what he did for loading coil Q and other lowfer topics in his excellent  'Lowdown' articles. I guess I should have done a Lowdown article on all the TX loop testing (multiturn results, ground spacing results, tree effect results, etc) I did way back in the pre-TX loop days but I figured the interest would have been low because few believed in those things. 
>  
> That's all.....
> Bill