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Locked N6RK Remote Tuned Loop Experience
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To the group; I am planing to purchase a receive loop antenna tuning network from N6RK Rick. Certainly not to question him or his talents. Already having a shielded coaxial loop, this would be the antenna tuning network, and the remote tuning box to assemble and connect to my loop. Of course this is a well received proven type of receiving antenna published in the NCJ magazine some years ago. I was just curious has anyone either purchased or built this exact system? If so wondering how it may have worked out for you, or did it? Respectfully I am not interested in the different types of receiving antennas. EWE's K9AY, beverage ETC. ETC.that you may have found to be better. I am more so very interested in your experiences and opinion of this specific remote-tuned loop. How has it performed, did it, how did you mount it, how high, how close to your transmit antenna,use a rotor ETC.? By means of severe space restriction, it is this type of receiving antenna I am selecting, and have specific only interest in and wanted to learn from anyone who may have any actual experience with. Thank you very much in advance for any potential replies, advise and help. 73 Ross ?KB8NTY |
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Have a look at this article - It might give you some ideas. Tony VK2IC73 On Fri, Mar 14, 2014 at 12:59 PM, <kb8nty@...> wrote:
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Hi Ross:
I built a copy of N6RK's remotely tuned loop and experienced little success. I was able to null a particular noise source in one direction but still had a very high noise level. To put it another way there was little improvement in received S/N ratios. I would also add that over the years I've had little success with any type of shielded loop. I've come to a couple of conclusions. 1) living in suburbia noise is coming from all directions and there is no single source to null out, and 2), this following an email exchange with N6RK himself as well as other readings, there is a very high probability that noise is re-radiating from my 56ft high tower and the loop being only 60ft or so away is unable to do its job. Solution is to detune the tower which hopefully I'll get around to this summer. The base of the loop is about 6ft above ground and is turned by a TV antenna type rotator. As always, YMMV. Brian VE7JKZ |
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Brian, I was so pleasantly pleased to see your reply, not so with your results yet none the less what a pleasure to finally receive "any" response related to my specific inquire...for that sincere appreciation! Well here in a small city lot with it's share of overhead power, cable, telephone lines I am seeking to improve my lower band receiving situation. Running a Mosley TA-33M WARC up on the rooftop and a Butternut HR9V ground mounted?vertical?w/ 125 radials, I get out...sometimes use the yagi to receive with ?on 30-40-80 meters, but looking for better. I did build a shielded coaxial loop 20' at 5' per side, notched at top and all one piece of RG-6. The feed line runs directly into shack. Issue is I built no tuning network into it...A surprise to see it does work to a degree, it does reduce the S/N but lacking any tuning abilities. Its on a 3 foot tripod on ground w/rotor and about 40 feet from vertical. I have read great reviews and have had conversation with? N6RK, and was going to purchase an assembled unit as now being disabled I am unable to?build and was asking for help with any users experiences. Possibly you may benefit with the detuning of the transmit antenna, this is not so uncommon, but discouraged with reading your results. I am thinking something don't sound as it should, I know there are better receiving antenna choices, yet I do not have the room, and even with my poorly constructed loop without any tuning, it did offer some help! I wish to thank you sincerely for taking your time for your reply...If you get the chance do try the detuning process, I think your loop should do better than you experienced! I'll post my follow-up experience for what its worth when I put his loop into play here ...Thanks again friend...I wish you luck with your loop there. -73- 73 Ross ?KB8NTY ?(all about ground radials) ?(ground radial talk-PLEASE VISIT & JOIN) |
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My pleasure Ross and I wish you well in your efforts. My goal has always been to improve reception capability on 160 and I'll have another go between now and fall. The tower which has a big beam on top is shunt fed for 160m and radiates well. Approx 3,000 feet of wire buried in the back and front yards.I can often hear people calling me but can't pull 'em out of the noise. It's tough!
73 Brian VE7JKZ |
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VE7JKZ - Brian,
Frustrating it is to know someone is calling you and you cannot pull them apart from the noise! I have experienced that at times when putting out a CQ, I will hear them in there calling but "in the noise" It does make you feel uneasy, then I wonder how are they hearing me is it propagation, or their receive set-up being better? Here also dealing with a city lot, the noise varies. It's time for me to get more set up with receiving on the lower bands here. I have done my operating up till now with the HF9V Butternut w/125 radials and Mosley TA-33M-WARC.? My big issue is space limitations here, so focusing on the loops. I did try a BOG but it seemed to pick up a lot of noise from my extensive ground radial field. I have learned to appreciate the study and theory of SNR and know that's what I have to hone in while balancing the selectivity & sensitivity working with the loop here. So curious with your poor experiences with the loops, possibly some common mode chokes on your loops feed lines may help, because if your getting noise on them all, it may help experimenting with such, in the effort to decouple the noise from traveling in on your feed line. Wishing you luck...I will report on my N6RK loop findings when I can here in the future. Thanks again for your input... Signing off. -73- 73 Ross ?KB8NTY ?(all about ground radials) ?(ground radial talk-PLEASE VISIT & JOIN) |
¿ªÔÆÌåÓýLoop antennas should be about the best you can do on receiving.? That is why they were employed by the military during the world wars.? That is not to say that they are not in need of careful tuning.? I cannot remember a comparison of technologies where the loop wasn't the winner.? Perhaps I am naive in that respect but if I recall correctly loop antennas are capable of receiving nearly twice the signal of other designs. 73, Alan - W6ARH ? ? From: loopantennas@... [mailto:loopantennas@...] On Behalf Of kb8nty@...
Sent: Wednesday, April 2, 2014 7:16 PM To: loopantennas@... Subject: [loopantennas] Re: N6RK Remote Tuned Loop Experience ? ? VE7JKZ - Brian, ? Frustrating it is to know someone is calling you and you cannot pull them apart from the noise! ? I have experienced that at times when putting out a CQ, I will hear them in there calling but "in the noise" It does make you feel uneasy, then I wonder how are they hearing me is it propagation, or their receive set-up being better? ? Here also dealing with a city lot, the noise varies. It's time for me to get more set up with receiving on the lower bands here. I have done my operating up till now with the HF9V Butternut w/125 radials and Mosley TA-33M-WARC.? ? My big issue is space limitations here, so focusing on the loops. I did try a BOG but it seemed to pick up a lot of noise from my extensive ground radial field. ? I have learned to appreciate the study and theory of SNR and know that's what I have to hone in while balancing the selectivity & sensitivity working with the loop here. ? So curious with your poor experiences with the loops, possibly some common mode chokes on your loops feed lines may help, because if your getting noise on them all, it may help experimenting with such, in the effort to decouple the noise from traveling in on your feed line. ? Wishing you luck...I will report on my N6RK loop findings when I can here in the future. ? Thanks again for your input... ? Signing off. ? -73- 73 Ross ?KB8NTY ?(all about ground radials) ?(ground radial talk-PLEASE VISIT & JOIN) |
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I still would like some input on angle of take off of a magnetic loop
comparing the capacitor at the top or bottom along with any other
information on best placement vs where they placed for function. Most
loops are anywhere from 3.5 to 10 feet above ground when used in
vertical position, with this in mind where should the capacitor be for
the best use of this antenna. I have included a drawing of my antenna i
am currently building and testing and now I am thinking of placing the
capacitor at the top with a long non conducting shaft running through
the diameter of the loop to below it. This will remove coax, DC cable,
motor and gear box away from the RF field of the loop.
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