[Lowfer] e-probe vs loop

Paul Daulton k5wms at centurytel.net
Wed Jul 31 16:57:20 EDT 2013


Garry my pa0rdt miniwhip quit working when the co-op installed a remote 
reading meter. It is on the tower about 8ft horizontal and 20ft above 
the meter. 

My 14turn loop with modified m0ayf preamp didnt perform until I moved 
it to the other end of the house and 20 ft to the rear, about 95 ft 
from the meter.  the orientation for ne signals like WM and SJ puts the 
null broadside to the meter. I need to move the miniwhip to the same 
location and see if it performs when located out of the noise 
field.Before the loop I never got SJ WM or EAR. on 1750 meters. Before 
the loop I only copied HSA, 45 mile away, a couple of hours a day on 
long wire or miniwhip. With the loop 24/7. 

while I blame the meter I could have devices like the DSL and washing 
machine that are generating the noise. 

Two years ago I complained to the co-op about the noise, I couldnt work 
80 meters and lf was gone. Tech came out and started to blame cable tv 
and phone on interference. I took my grundig g5 out to the street, I 
have underground entrance, and held it up to the ground wire tuned to 
high end of BC band.Noise full scale on meter. He said he would send 
out noise crew next day. I never saw them but two days later they 
replaced 7 poles and hardware across the road and 80 meter interference 
went away. 
Paul k5wms

Quoting Garry Hess <k3siw at sbcglobal.net>:
> Alan,
>
> Thanks for the comment. 
>
> Yes, the loop is a single, untuned turn, based on VE7SL's writeup at
> http://members.shaw.ca/ve7sl/loop.html. 
>
> I've seen others comment that above modest height the e-probe
> sensitivity stops improving. Thus, an ideal location might be a large
> open field with the bottom of the probe up only 15' or so. That would
> place the antenna well away from local man-made noise sources but not
> too many of us have large open fields handy, hi. 
>
> The bottom of my e-probe whip is currently about 35' AGL. That places it
> above everything but my 65' tower (a roof tower with triband HF beam and
> a couple of VHF antennas is close in level, but probably not really
> higher). I've thought about putting the e-probe at the top of the tower
> mast (~75') and may yet do that, but I'm not confident it would survive
> there for long. On the other hand I have a new winch for the tower so
> raising/lowering won't need Hercules any more, and replacing blown JFETs
> is easy, and cheap. 
>
> -- 73, Garry, K3SIW, EN52ta, Elgin, IL
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Paul Daulton K5WMS
beacon WMS 185.302 khz qrss30/slow 24/7
Jacksonville,Ar 72076
em34wu



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