CB RADIO: Build a Citizen Band Loft Antenna - Home-brew Wire antenna for 11 Meters.
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- čas přidán 6. 08. 2024
- Citizen Band Loft Antenna, A Home-brew Wire antenna for 11 Meters. I just had to try this out, can you build a CB antenna in your loft that really works, well the answer is YES.
What you will need:
5 X 102 inches or 2590mm of wire ( household wire will do).
a short bit of pipe ( if your loft is not tall enough for a Full 1/4 wave.
Strip connector and coax with a SO239 or PL259
Have fun...
Many thanks
Mike - M0MSN
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here in the north east area of the united states... CB has given may to the cell phone. this was an interesting build... thanks for sharing Mike
Very cool video it's amazing how much they charge for an antenna I never realized how easy it is to make an antenna until recently thanks for a great video
Good video thanks mate, back in 1978/79 I had the usual DV27 aerial in the loft mounted on a biscuit tin as was the craze back then. The thing that differed was that I had put 4 1/4u ground radials on said tin and it worked quite well considering.
Very cool!
Good job Mike and glad you are including the CBers on your channel. I did a similar build in the 70s. Back then there was a lot of tube and fittings from old 405 line TV aerials. they were easily built to a similar design as yours and were free standing. Good for a loft or a flat roof
Good old days 👍❤️🤪
Nice work Mike.
Unluckily I live in a downstairs flat, so no attic. Luckily I do have a scaffold pole base concreted in outside my window about 6ft away, so I can drop a vertical in a few feet off the ground. No issues with the Council, but may have to warning tape when the new RF considerations come into force. I can't see much of an issue at 10 watts into an Antron 99, no burn issues there ! Great video as usual Mike. 73's Andy M6APJ
Nice video. Love those antenna experiments.
Thanks
Hi Mike, Great video! Nice to meet you at Callums and thanks for the mug of tea!
Yes, 😂
Woohoo, congratulations
That's got to be one of the cleanest ( and emptiest ) loafs I've ever seen :-)
Hours of moving stuff so I could film. 😂
Another great video Sir! And you did not get dragged into doing the hoovering either!!
You got that right!
Hi Mike, happy you're dealing with 11m too ; most of us started there, while being just a CBer I made my first dipole, my first experimental AM transmitter and my first experimental FM transmitter (broadcast bands) then had my HAM ticket after my studies.
From time to time I am still using 11m, can be a fun band with lots of fun people.
Keep up the good job, I enjoy very much your channel!
such peaky roofs in the UK! I can barely fit a quarter wave VHF antenna in my attic / crawlspace in Florida. nice build!
Hi Mike, You could have put a full .25 wave antenna up and just put the extra couple inches on a right angle and forget about the coil. It’s the voltage end of the antenna.
I agree. It would be more efficent than using a coil as well as simpler to build.
Yes. And it would be more efficient without the loss in the coil. I've done this with dipoles and even my antenna modeling software (EZNEC) shows no real distortion in the radiation pattern on a vertical such as this.
Or follow the truss/frame on slight angle just off vertical to get length
Or if you needed a bit more put antenna base through roof capping & attache inside element to it with excess outside
Inverted vee dipoles also work well in a loft... good video..
sounds like another video...
You should try out a Moxon beam for 11 meters. I'm working on one now to put in my attic. Supposed to be just as good as a 3 element yagi, but with a smaller footprint. I shall soon find out.
Keep up the great kitchen projects. I really enjoy your channel.
It has 2 elements, so it won't be as good as a 3 element beam. Moxons are excellent though.
I'm using a 27mhz moxon fitted to a tripod inside my flat.
Only have 2x90 degrees of rotation. North to East & South to West. Have had copies into South America, mainland Europe, just about got to Madeira a few weeks ago in USB mode. FM not so good.
Many thanks for the flowers 💐 (Moxon soon) maybe.
Nice antenna Mike!
Love the English accent!🍺😃
Thanks 👍
Good simple antenna Mike, loving that they all sound like Gerald off the Jeremy Clarksons Farm program 🤣 73
Lol 😂
Good vid. A nice simple classic. Worked well for me many years ago, but tried similar earlier this year and it picked up way too much electrical noise. Didn't hear many people on either, even though it doesn't look that I am far from you (am in that Roman town to your SE). So took it down and put up an inverted V in there just for skip shooting.. that works well, picks up a lot less noise, and can even get out to the odd local even though it's on the flat side.
Yes the inverted V dipole was next 👍🍌
I like these videos and how the Mike is an enthusiast who enjoys the whole of radio in general . Obviously not omitting 11m like too many hams like to shun cb... even though most probably dont let on they have an antenna such as this hidden away to at least listen in on 11m, as most wouldn't like to be seen on the band with 'the muppets' . Guys a lot of my best contacts were made on 11m DX . I do have my ticket but nothing beats a rag chew on 11m with other hams nearby while also talking to the guys on CB.
Great video Mike and thanks for taking the time to share your work
I dare not go into my loft. That's where the Spider Babies live. They have the body of a spider and the head of a baby.
LOL, and they are called fluffy
@@mike-M0MSN Will we all be racist now Father Ted ?
Another easy way t get on the air. The vertical is better than a dipole because of polarity loss locally, not sure about trying a dipole for skip, the take-off angle is still better for a vertical. Another nice kitchen table project. I still can't figure out how your builds always seem so broad-banded. The coax run is short so the rg58 loss should not be that bad to make everything broad-banded.
Hi great video, can i ask, when you coil the wire round the tube is that just to make the length shorter so it will fit, or is there more to it than that ? I see you used an online calculator of sorts to work out how many turns ect, can you please explain what the coils of wire round the pipe about ? Does it double up as a choke ? Thanks
I would have just stuck a small capacity hat (metal disk - radius = the length you needed to make up the 1/4 wavelength, could be just 3 wires) on top, 2 advantages, simpler to make, also increases the bandwidth so easier to adjust.
Great tip, thanks John.
3rd advantage: less loss than the loading coil.
10:4 good buddy
hello, nice job. in the end to have a good swr centrobabda, 27.205, what measures did you use?
Excellent video thanks for adding calculations, some people just throw it up
One hundred and two inches 😂😂😂
👍👏👏
Did you try an inverted V antenna instead?
How many watts do you think this will handle?
Hi Mike what is your source for the so239 you have on the end of the cable? I have been looking for some...de m0tfy
Cheep eBay jobs
Not bad Mike. I'll give you 4 1/2 Bananas out of 5. 73 Joe
🍌🍌🍌🍌
Super helpful 💚🇬🇧🌱
Steel whips are 102 inches but using copper is 90 something inches.
Just curious - for the sake of a mere 9cm (2.5m tall attic versus 2.59 resonator) why not simply bend the last 9cm at an angle ? (like a 9cm inverted L )
Too easy. 😂
Will this work on the 2 4?
Same technique but need to calculate and cut for the frequency you want in the same way. For example for exactly 70Mhz: 300/70 then divide by 4 for quarter wave and times velocity factor of .95, so about 1.02m for driven element and say 15% longer radials say 1.1m long approx no need for any coil at this length. Give it a go!
Mike, just thinking, you might have just stretched it out as far as you could and just made an inverted 'L' out of it mostly vertical with a slight horizontal aspect to it?
Somewhere, someone taught me ALL coils are evil and like wild women must be avoided?
Yes, avoided
It's already been said, but I would rather just bend the top few inches of the whip rather than use a coil. Or using a loose spiral around a pole for the vertical element....or use a top hat to electrically shorten the antenna, Thanks for your interesting videos.
Great point, but I did the antenna this way to show that you can use a coil in lofts that are maybe only 6 foot tall or less.. an inverted V is the simplest answer...
Mr mud duck 🦆 😅😅😅😅😅
Try a u dipool 2 side 1.34m horizontal 2x1.34m vertical downside 2.5m high de verticals 1.16m from grond freq 27.5 swr 1-1.6
wen jou hang him on 5 m high he gose up in freq 28.277 swr 1-1.1 simple antenna (Mmanagal is you friend)
Good idea 👍
I can't stand FM for some reason.
Just don't like the sound of it. I much rather prefer single sideband
aah... muppets
First…
Well done! Don't forget to ask for your prize!
Lol
"I'll turn the video off and come back and talk to you properly" SPOILT!!! :-)) Yes i understand people do not want to appear in videos
Why don't you build a 5/8 wave loaded aerial for the loft, yes I know I could work it out for myself, but there are a lot out there maybe can't. It should perform just fine, but you never know..
My mate stuck a 1/4 wave 102" steel whip out of his ridge tiles and used metal sticky back tape to give ground-planes coming off at an angle (Bit like the home-base Thunderpole. Worked very well, he came into me at a S9 +10 at 4 to 5 miles away. That was on 3 watts. His signal was so strong to me that anyone shouting to get in didn't have much of a chance, unless \i heard a faint squeak in the background.
Two for you to consider Mike :-)
I was all excited.
Then I read it was CB.
Boooo.
Just make one for 10m or 6m then...
The same principles apply for 6 or 10 meters...just need to adjust length accordingly.
Well I could have said 11 meters or 10 Meters it all radio
Principles are exactly the same as any 1/4 wave. It's radio antenna science, education, informative, homebrewing, practical, maths, velocity factor computing and FUN no matter what the frequency, or does RF somehow behave differently at 27MHz?
@@mike-M0MSN Quite correct. My apologies. My hideous bias betrays me.