The mysterious MagLoop "small loop antenna" lets answer a few questions. part 1
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- Опубліковано 28 гру 2019
- Please join in on this one folks, I've been designing these bad boys for years yet I am still on the path to true enlightenment!
The Magloop is a wonderful small antenna that can get you one the air when you never thought it possible..
if you have any calculations for dipole current and voltage along their length that would be amazing.. leave comments :-) - Наука та технологія
Great practical and educational vid. Many thanks Gary.
Cheers Gaz, had the ciro baby loop for a few months now and love it. You hit the nail on the head with the comparison, can’t get a dipole up high enough, can’t leave a 30 foot vertical up full time. Given my circumstances the loop out performs every other option I have. I would live to see the 3D radiation pattern.
Thanks Gary, glad u made the video. It reminded me of a few things I had forgotten. Am wanting to experiment with a loop during the Holidays, cheers, n keep the videos coming...73s
Great explanation - Keep them coming.
Great video! Thank you for sharing your knowledge.
Great video mate. Really. Enjoyed it. Been building a few loop antennas myself..
Thanks Gaz, very informative in an honest way. I've made an octagonal loop for 20m using copper pipe fittings, now just wondering about my soldering?
Many thanks for your explanation fantastic information it is the only way for me to be on the radio with a mag loop which I will buy from a US manufacturer possibly the hs3 loop
I made a mag. loop to null out noise here. For 40m I transmit on my outdoor inverted U but receive on the loop.
G4GHB.
Hi, Gaz. Great video and explanation of magnetic loop antennas. I still do not understand why installing a vertical loop 1-2 meters above the ground is best but higher mounting say 10 meters or so is bad? Also, how about horizontal mounting for omni directional? 73 Alan KZ6B
Very informative for me as a novice with mag loops. Answered so many questions I had. Tks G4ZEO
thanks, do check out Geri's video.. Gaz
I'm using a loop and understood the basics of it. Your explanation improves my understanding. Thanks. New subscriber, will be watching for more. 73 W0YVY
Thanks Lew, I'm just planning part 2 as I have had a few questions :-) gaz
Gaz With most of the new radios having spectrum waterfall displays showing sometimes the whole band, what do you see when using a very narrow band width (Hi-Q) magnetic loop. Would it be possible for you to make a video showing a modern radio working with a magnetic loop antenna, to see just what happens on the waterfall.
this is part of both the benefit and the compromise, the Q is very high, and if the loop is of poor design it can be so high as to nip the edges of the TX signal.. but something like a ciro you can see a fair bit of the band with an obvious sweet spot.. I forgot so much in this video I will do a part 2 to complete it.. thanks again Gaz
An antenna with a high Q will show up on the spectrum display as a hot spot, an area of several kHz that is stronger than the rest of the spectrum. It's VERY distinctive, and is easier to see than to describe.
Great video. And subscribed. 73
Cheers, bit more coming as I've had some questions raised :-) gaz
Small Loops are directive. They have a null in the direction of the HV point (towards cap), which is commonly pointed straight up. So..., rotate them 90 deg; so the null is on the horizon, pointed away from a signal of interest or away from your noise..
Why’s everyone pointing them into the dirt usually?
Is there any logical reason to believe that the magnitude of the current through the loop is not the same at *any point* around the loop?
resistance changes around the loop?? I made refrence to a very clever lady who explains it better than I.. gaz
My experience so far with mag loops; great receive, even low to the ground, transmit very, very- poor, not as good as a magmount car antenna. I will be making some very large mag loops for shortwave ,receive only, where they make sense.
I speak to people every day with the ciro loops who work the world on them.. so I think some are better than others.. certainly section diam is hugely important.. Gaz
@@TheGazLab yes went as large as possible 85 percent of one quarter wave, the receive was exceptional , the transmit was dreadful, used different caps, loop is a good weight of silver soldered copper pipe, all joints were soldered, caps were almost free of contacts and moving parts, one was an inserted copper single trombone, so as to be sure there were very few joints, this was all for a 10 watt qrp, s7 transmit on my full wave folded dipole, less than s-1 on the magnetic loop. Receive was the same on the mag loop as on my full wave antenna at 55 feet, very impressive. I am gong to build a 10 meter loop for receive on the low bands, but as it stands, I have no more plans to build mag loops for transmit.
well done Gaz, I am first.
Lol hi Brian, happy new year to you..