Portable Magnetic Loop Antenna for 11 Metre 27Mhz CB Band

[@alanhewitt6607]

At long last a CB radio enthusiast showing there's a world of aerial technology out there and showing how to pull it off.I made a spider antenna many years ago and was pleased with the results I Love the Alchemy of the art .:-)

[@flynnhelsing]

Made one of these with scrap parts and a $7 capacitor. Worked Slovenia from Indiana on 5watts ssb. Good times.

[@johnleonardelli_VE3IPS]

Good to see mag loops are alive and well on 11m and the Freebanders

[@m1aws]

I made one with a 3m x 20mm cu pipe. Bending it by hand meant I had to cut off about 6"~8" from each end. Found the capacitance for 11m was literally soldering the ends together with double sided copper circuit board. So it was a solid ring with no tuning required For efficiency the coupling of the Faraday loop (1/5 of main loop dia) is paramount..Mine was close coupled into a triangle with the co-ax "earthy" end against the loop. It was brill in the garden. Get a music player and rotate the goon away. Most effective.

[@PaulaBean]

A schematic would be nice - I couldn't quite understand now the little loop is constructed.

[@26CT1445]

www.microfarad.de/magnetic-loop/

[@SpectreOZ]

SW(a)R meter? local linguistics I suppose, down here most CB'ers called them SW(e)R meters much to the disdain of our resident Amateur Radio Operators. Good on ya' for having a crack at building something for yourself, thumbs up!

[@MakeDoAndMend1]

Hi matey. I am in Corby. I just love messing about with loop antennas. Not used mine up a hill yet as still experimenting. Had it over a year now and fantastic reception on the HF bands. Cheers from old George normally in garage. Ps not really much C B work so what's a good freq to listen too and uk time day etc.

[@Satchmoeddie]

11 meters is supposed to be limited to QRP 4 watts AM 12 watts SSB in the United States, but we will always have those people who run 100 watt 10 meter radios modified to operate on 11, and the scant few crazies that run 10KW linear amps. Nice job, mate! Cheers, 73s KI7AQJ

[@ol2tmx6916]

I love QRP and especially when it gets DX

[@Dazzwidd]

I just finished making a square one out of 19mm copper pipe. I used a butane blow torch to solder the elbows. I was aiming for self resonance at 27mhz with no capacitor and just a gap at the top. I got close but unfortunately it's a shade too short. I made it 1.2 by 1.2m. In hindsight 1.25m square would have been perfect as it needs only about 3pf to get it to tune to 27.205. A touch annoying but when I get it tuned it puts out a cracking signal with 4watts according to my field strength meter.

[@johndminigan1869]

Hello, I am 9TC829 In Windsor Ontario I have been watching people build Mag loops for a while now and stumbled over your Utub video. Great Idea.

[@andrewandrosow4797]

Good work! I have a homemade loop antenna, made from cooper tube (diameter = 3/8'').The diameter of this antenna is roughly 19 Inches. I live on the fourth floor in nine-floor house . The variable capacitor is an air capacitor (two sections) from an old radio.I connected the loop between 2 stators plates. I put ito my antenna 0.7W (27MHz).But.. unfortunately an reception range was only 400 feets. There is a heigh building (9 stairs) next to my hause.

[@BarefootBeekeeper]

FYI "REF" stands for "reflected", not "reverse".

[@26CT1445]

Part of the RF voltage may be reflected back from the antenna in a reverse direction. SWR is a measure of what is happening to the forward and reverse voltage waveforms and how they compare in size.

[@johnblaisdell2179]

Loops are simple but very effective. nice video

[@richards779]

Great simple loop made in an hour for a few quid. Nice presentation. Thanks (:

[@mokotramp]

Looks like something you'd haul a floundering kid from a swimming pool with!

[@antenaseinterfacescb]

Congratulations for your work. I made a Delta Loop for 11 meters, 11,13 meters cable 4 mm 1,80 meters cable 75 ohms. So the Delta works fine in DX and local QSO´s. 7351. Tks, hope listen you on the air.

[@26CT1445]

Thanks. The Delta Loop should be far superior to the mag loop. I have a half-size G5RV in the garden that works quite well.

[@ol2tmx6916]

Thank you for the nice video. I always found descriptions for only reception mla

[@RosssRoyce]

Hi sir thanks for vid and explanation. If you were to put a tuning capacitor on a dipole antenna in an analogue way where should you place it and how would you connect it?

[@Sivolcss]

You could show the antenna in use with some rigs band 27Mhz. Would be great!

[@26CT1445]

Thanks, there is another video where I'm using the antenna elsewhere on the channel.

[@ComputerLearning0]

Very cool. Simple yet effective. I may make one of these myself :)

[@jhallo7740]

It's the trick to take the loop diameter just right for the desired frequency. The radio capacitor should have low capacitance, of say about 30 pf max. That way, tuning should be more easy, and the antenna works better...

[@johnblaisdell2179]

I find that size isn't critical (my wife would disagree lol). What is important is that the primary is 1/5 the secondary. For example a 4'' primary loop and 20'' secondary. A 50pf capacitor works great also. Experiment with round vs oval primary for more or less coupling.

[@jayfrancis9081]

I am looking to buy a11 meter loop antenna .

[@RadioHamGuy]

Very nice work on the video and thanks for the mention also! I still use my loop here in the summer time mostly for portable use. 73...Larry wd0akx

[@26CT1445]

+RadioHamGuy Thank you, I was inspired to make the loop after watching your video.

[@smokeymountainrain]

Can you slip a garden hose over the exposed copper tubing of the big loop for child safety, if not, how about electrical tape? will insulating the big loop affect it in any way? one more, is the exposure to the field it creates harmful to man or dog in any way?

[@26CT1445]

smokeymountainrain Yes I would say you could. As to if the RF field is harmful that would depend on the input power and proximity to the loop as with all antennas.

[@CB-RADIO-UK]

Wooh did not realise that the voltage would be so high on the loop. Any idea how much would be generated at say 100 watts TX ?

[@26CT1445]

+fredintheshed1 Over 2000 volts RMS!

[@Satchmoeddie]

Yep the high Q equals 1000s of volts and 10s of amps. I bought some Comet 15KV variable vacuum caps (Swiss Made) for a loop antenna to run at 300 watts. I may try it at 600 watts, but I doubt it would handle my newest home brew linear amp.

[@26CT1445]

Please enable replies when you comment so I may get back to you, thanks :-)

[@timg5tm941]

Nice video - have you seen a reduction in noise levels in comparison with a vertical antenna if you have used this at home?

[@26CT1445]

The magnetic loop is low noise compared with a T2LT but since getting my ham licence I have not done any more experiments with the loop.

[@soldadodecristo9254]

Buenos días me podrías compartir las medidas de la antena para fabricarla gracias

[@Wheel-1]

New Sub here , Awesome build ! Would you mind sharing plans to build ?

[@26CT1445]

There are links in the description.

[@masken72]

i cant log in on charly tango padge 21ct 003 björn

[@runningbear4666]

10 Meter antenna build HELP PLEASE I built a similar antenna as the colossal 15Kw antenna, and see there i a capacitor on it? my question is what kind of a capacitor and how should it be connected My antenna is actually large copper radiator .64 wave calculated to half of that in hopes I get that little bump the .64 wave is know for! it is 1 1/4" copper to 1” copper to 1/2” copper radiator antenna pieced together. then the 8 radials coiled 10 gauge wire around fiberglass rods at 55% down slope. I will tune it for 50 ohms and low SWR But it is built tuff and am now looking to test with meters to see where it resonates, but thinking that it should have a static release the 8 coiled rods are attached to a 1’2” thick aluminum 7” diameter plate each coil is 103” long on a 4 foot rod and may ALSO BE MADE TO RADIATE? I intended to have this for ground plain only and have the aluminum plate grounded to ground rod I have driven 8 feet into the ground. some thoughts? static concerns? etc. thanks Geronemo in ND

[@shriramvenu]

is it just me or is the audio volume fluctuating a lot between very loud, normal and soft? Im noticing this on quite a few youtube videos of late, so perhaps google has introduced some faulty agc into their player

[@26CT1445]

+shriramvenu I haven't noticed it.

[@goatsinker347]

Exactly the wobbly "loop" shape construction i'd expect from an 11 meter band aficionado.

[@tamagochy475]

good afternoon I have here the material to make one of these antennas by ca home to 11 meters for a balcony but I have some doubts of how I connect rg-58 cable and 2 meter tube to the capacitor can not-find a step scheme by step another thing is that I can put a garden hose in the copper tube? sorry for my ignorance 73

[@26CT1445]

Hi MultiJorgecardoso cardoso The outer copper tube is not connected in any way to the RG-58, the feedline is connected to the inner coax loop only. To connect the outer copper loop to the capacitor I used thick copper wire. Keep the wire as short as possible to prevent losses. I was able to use a mains powered soldering iron to solder the wire to each end of the copper tube. Hope that helps :-)

[@darrenfaraday8323]

HI 26-CT-3259 here I've watched your video recently and was wondering how you wired the capacitor im having trouble with mine its identical to yours and have had to change the capacitor as it only went down to 11.7pf so got another one which goes down to 6pf so is there a certain way to wire the capacitor many thanks 73s

[@FlamethrowersAgainstSnowflakes]

How far can you talk locally with this?

[@26CT1445]

It depends on a number of factors. To be honest since I built it I've hardly used it!

[@motorcyclesandthings8633]

So the big question ,,,,how good is it

[@26CT1445]

Pretty average to be honest.

[@Sivolcss]

Very good work!

[@WillemHosking-lz7tx]

Will it be possible to e-mail me the blueprint plz

[@26CT1445]

There are links in the description.

[@w4wxp]

How well would this do locally as a regular cb antenna compared to - say - an a99?

[@26CT1445]

+w4wxp I would stick with the A99. I built the loop for use on a specific frequency for portable use only.

[@TheBrynu]

the magloop antenna will work better for ssb not so good for fm

[@KenWoodTS480]

hi how do you connect the diode to the meter will this work on top of my tuner /?

[@26CT1445]

+echo xray The diode is connected across the meter terminals and needs to be close to the antenna.

[@richie73]

does the capacitor size matter or would any size work

[@salgalvano3573]

+R oh (thunder) Depends for which band you wish to operate. I have a loop that has a 30 to 250PF variable cap rated at 3kv and the loop is 3 feet in diameter. It tunes 40m thru 15m. It can handle about 35watts. Good luck.

[@richie73]

+Sal Galvano i would be on 11m from 50 up to 100 watts

[@26CT1445]

The value of the capacitor is determined by the frequency you want to work.

[@hilariobausing6985]

Let me know length of radiotor

[@26CT1445]

There are links in the description.

[@ifell3]

I researched these and i was under the impression they are not very efficient, as in if transmitting on 5w's would be the same as on 3w's is this correct?

[@26CT1445]

I found reception to be better than transmission. I would say if built correctly they are very efficient.

[@CB-RADIO-UK]

Nice job ;-)

[@alvarobarcellos3090]

Olá amigo você poderia me passar o diâmetro da bobina grande e depois da bobina menor para 11m

[@26CT1445]

Info here - www.66pacific.com/calculators/small-transmitting-loop-antenna-calculator.aspx

[@paulosete3817]

Ele falou, 2m de fio 10mm, e o loop pequeno 1/5 do diâmetro do grande.

[@Orangeeliminatork]

where i can buy the capacitor

[@26CT1445]

+TheLoudcivic I bought mine from eBay.

[@UBIQUITAR]

We call it S-W-R Like RCA or VCR or VHF We just say the letters.... Excellent demonstration of the build and I hope to replicate a version using 7' of 4" copper at 99% efficiency. 5k vario and the like. Thanks

[@alanhewitt6607]

Mag loops are great in noisey environments .I.e where there's loads of computers being used.(Noisy switch mode P.S.U,s plus computer transmission noise,Most urban enviro's).Get the outer loop to be as conductive as possible and make the coupling snug as a bug and Bobs your uncle and fannys your aunt. :-)

[@gabrielsansar6187]

we call it whatever we like because we can.

[@adlapl]

Great one! :)

[@Radionut]

Hello from 2ct014. This is a great how to video.

[@26CT1445]

Radionut R Thank you.

[@graziadiocarniel11]

bonjour antenne loop pour le 27 mhz on peux avoir les cotes de l'antenne merci 73 14 cg 01

[@26CT1445]

Info here - www.66pacific.com/calculators/small-transmitting-loop-antenna-calculator.aspx

[@nlo114]

SWaR. hmm, sounds like a bit of Boris Johnson sneaking in there. (or maybe FWaR!)

[@26CT1445]

Who's he?

[@Alfa011]

Nice!

[@olafschlomer3398]

Top video..!!!!

[@jayfrancis9081]

Can you make me one. I will pay you for it

[@26CT1445]

Thanks for asking, sadly I don't have time at the moment.

[@eknaap8800]

Swarr...????

[@26CT1445]

The SWR is adjusted with the tuning capacitor and is low. A reduction drive, which I don;t have fitted to the capacitor would help set it with greater accuracy.

[@eknaap8800]

@26CT1445: As a HAM radio operator, I do know what SWR is (Standing Wave Ratio) and know the physics behind it. It's that I've never heard it called a 'swarr' before...

[@26CT1445]

I'm a ham operator too, the word is a colloquialism used by the UK CB community.

[@eknaap8800]

Weird...

[@tks5138]

バリアブルコンデンサを入手できない。

[@paulc7973]

This breaks the terms of your licence

[@26CT1445]

To what licence are you referring?

[@allsortsabouteverything]

What licence would that be then paul c ?

[@shroomskunk]

Only directional antennas are not to be used for cb