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 70cms Homebrew 6 Element Yagi-Uda Beam

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Victor
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Victor

Call Sign : 26-CT-3228 Ham M7VIC
Posts : 2369
Times Thanked : 161
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeFri Aug 13, 2021 5:42 pm

Hi all,

Hope you're all keeping well and enjoying your radio. 70cms Homebrew 6 Element Yagi-Uda Beam 1f44d 


Can't help myself, enjoy this radio malarkey so much that I keep building things. (Makes for brilliant learning experiences if nothing else! Wink)

The latest 'homebrew' creation is after an opportunity presented itself in the shape of some discarded TV antennas.


Actually, they were 'discarded' in my own attic! Left over from when we had to upgrade our antennas for the TV analogue service switch off to go digital. They call it progress.....now I have more channels than I can shake the proverbial stick at with far less things worth watching!?! (Repeats of repeats and each channel labelling them as 'New' but only new to their network or channel not to the unfortunate viewer!)

Wouldn't mind but the new antennas are monsters yet don't seem to reliably pick up signals from a huge TV transmission tower I can actually see on the horizon from the upstairs bedrooms! Rolling Eyes
(Sandy Heath.)


Anyway, whilst stripping apart the old antennas I began a bit of reading on Yagi-Uda beam antennas.
"Uda What?".....Mr Yagi was the front man and most forget about poor old Mr. Uda.

So after a bit of reading, researching, more reading, (some people really like their maths and numbers Wink), I came across the following site :-

ON6MU - Home Made UHF Yagi Antennas

Ah, here we go, some actual sort of plans without all the 'fap-fap' numbers, charts, diagrams thing going on.


The basic measurements helped, except the boom I had was a different size.....and the directors/reflectors were flat, not tubes....and a different size.....and in fact nothing I had matched the materials list whatsoever! Shocked

Hmmmm.....let's go for it anyway!


I broke the aluminium pipe that was the old TV folded dipole trying to straighten it, (Doh!), but luckily I had some 8mm soft copper pipe left over from my 2m Halo Antenna project a while back. That'll make a new dipole and should fit one of the TV antenna mounts, (a bit of drilling to enlarge the holes from 6mm to 8mm helped).

When you make this dipole cut it longer than specified on the ON6MU site.....go on, ask me how I know that. Wink
(Yeah, cut it flipping twice!) I made the reflectors & directors pretty much the same size as specified luckily just needing to trim the old TV aluminium struts down to size.

I didn't have another spare piece of aluminium to make the 'bazooka choke' mentioned on the site but a ferrite tube cut from an old PC VGA monitor lead should slip over the coax and do a similar job. 70cms Homebrew 6 Element Yagi-Uda Beam 1f44d 

Then I marked the boom with a pencil with where everything should be placed but did NOT screw everything down yet......


I carefully balanced the dipole, reflector and directors on the TV boom, (15mm x 15mm), where the measurements/markings were made. Then tentatively hooked it up to my Zetagi SWR meter.....yep, CB SWR meter and as long as you have low power going into it, (My Baofeng was set to 'L'), it's quite useable at these frequencies. I then slowly moved everything back and forth until I got the lowest SWR reading, (1.8 ), and then finally trimmed down the dipole until the SWR improved even more, (1.2).

I still did NOT screw everything down yet.

With the aid of a field strength meter, (I didn't have one but a couple of pin diodes and an old analogue meter later I built one!), I then slowly moved everything back and forth again until I gained the highest readings on the field strength meter. It was at that point that I drilled the boom for all the fittings and finally screwed everything down.


So with a big 'Ta-Dah!' we landed up with this -

70cms Homebrew 6 Element Yagi-Uda Beam 70cm_y10


None too shabby eh? Wink


It would have all been a little easier had my antenna analyser gone to 70cms, (MFJ-259B), or if I indeed had a NanoVNA....but I don't, so I managed with what I've got.


So how does it perform? (The real crux of the quest.)

Well, with my little Baofeng and the nearest repeater being some 15-16 miles away, (GB3OV), my 70cm activity has been a little lacklustre.
(I can only hit GB3OV if I hang out of the bedroom window!)

......Now I can hit SEVEN repeaters!!!! Smile

All a clear radio 5 just by pointing this monstrosity towards the target repeater whilst sat in my chair, in my radio room. (Yep, haven't even mounted it yet!)


Think that'll do nicely. 70cms Homebrew 6 Element Yagi-Uda Beam 1f44d 

I can even chat to my old Ham friend who is only 20 miles from here but is separated from me by a rather large hill(!). He opens GB3TU, (Tring), and I point my beam South accessing it thereby circumventing said hill.


Gain? - Hopefully whatever the ON6MU site says or as near as dammit.

Charts? - Yeah, not my thing Wink



Anyway, thanks if you got through another instalment of my waffle. Been a while.

Don't be afraid to make an antenna out of what you've got laying around and if the maths and charts puts you off...simply ignore them.


Right, I have an old cordless drill lying around somewhere.....and a broken telescope equatorial mount....

Should make a nice antenna rotator! Smile



All the best,
Victor

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aleksandar
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aleksandar

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Posts : 60
Times Thanked : 7
Join date : 2020-10-09
QTH or Location : Kikinda
Equipment Used : crt ss6900n, ss3900black, roadstar rm 550
Age : 45

70cms Homebrew 6 Element Yagi-Uda Beam Empty
PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSat Aug 14, 2021 7:31 am

nice job Victor.love diy projects.have good experiences with diy antennas, made a lot of them.this is my for pmr:
70cms Homebrew 6 Element Yagi-Uda Beam 15344310
70cms Homebrew 6 Element Yagi-Uda Beam 15360510
70cms Homebrew 6 Element Yagi-Uda Beam 15415710

glenn dog, Pappy Nick, Victor, 43CT016, Alan Pilot, Me001, SangueG and Des Collier like this post

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Victor
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Posts : 2369
Times Thanked : 161
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSat Aug 14, 2021 8:09 am

Thanks Aleksandar. Smile

Nice job there yourself with the PMR Yagi. 70cms Homebrew 6 Element Yagi-Uda Beam 1f44d


A NanoVNA like you have would have made the job so much easier! Not bad for my first ever UHF beam though.
(Now that I've built one I'll have a lot more confidence in building others.)


All the best to you,
Victor
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aleksandar
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aleksandar

Call Sign : 45CT001
Posts : 60
Times Thanked : 7
Join date : 2020-10-09
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Equipment Used : crt ss6900n, ss3900black, roadstar rm 550
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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSat Aug 14, 2021 8:21 am

put a stronger lithium polymer battery(more mAh) and little diy on SMA to SO-239 adapters on my nano.yes, made the job so much easier.

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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSat Aug 14, 2021 8:56 am

I did notice on the pictures there Aleksander. Looks like it makes the NanoVNA much easier to use. 70cms Homebrew 6 Element Yagi-Uda Beam 1f44d

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Razz229
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Call Sign : 26 CT 2290 & 26 CI 2290
Posts : 197
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Join date : 2019-07-01
QTH or Location : Edenbridge, Kent
Equipment Used : On 11m CRE 8900 or a Anytone 6666, Moonraker 1/2 wave vertical antenna or a Sirio 4000. On PMR a TYT TH-9000D, a 1/4 wave GPA, homemade mag mount & sometimes a 8 element beam.
Age : 54

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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSat Aug 14, 2021 11:51 am

Hi Victor

What a good bit of recycling and antenna building.

On the South Coast PMR net, antennas are often a topic on conversation and I say that if you see an old 406 tv antenna in a skip grab it. It is an easy/cheap way of building your first beam antenna.

Now what happens if another free tv antenna becomes available?
Will you adding more elements and doing a comparison?

Good luck & all the best

Ray

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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSat Aug 14, 2021 3:02 pm

Hi Ray,

Thanks, did enjoy building it. 70cms Homebrew 6 Element Yagi-Uda Beam 1f44d 

I'll bet you have some great topics of discussion on the South Coast net and a shame I'm not a bit closer to join in on the fun. Well done tempting people into constructing their own antennas from whatever is available, I learned a lot, saved putting it in the bin and best of all it didn't cost me a penny! Smile


Another antenna?
Who knows, but in the mean time I'm going to have fun with this one as I now have several more repeaters to explore.


All the best to you, well done with the nets & send my 73's to all involved.

Victor

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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSat Aug 14, 2021 4:02 pm

Victor wrote:


So with a big 'Ta-Dah!' we landed up with this -

70cms Homebrew 6 Element Yagi-Uda Beam 70cm_y10


None too shabby eh? Wink

Real nice job Victor, sorry been away from Forum, for a bit as non too well recently , back to some semblance of normal this weekend anyway Cheers Tony
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Victor
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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSat Aug 14, 2021 4:36 pm

Hiya Tony,

Much appreciated mate. 70cms Homebrew 6 Element Yagi-Uda Beam 1f44d 


No need to apologise about being away from the forum. Life, health, family, etc. will always come first.......Charlie Tango does come a close second though! Wink Very Happy

Sorry to hear you haven't been too well and I hope you are feeling much better. Please do take care of yourself.


All the best,
Victor
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SangueG
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Equipment Used : SS6900N, Xiegu G90, DX-300 for SWL, all antennas home-made

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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSun Aug 15, 2021 8:51 am

Well done Victor. It looks a very tidy little beam and pleased it's working well for you. Kirstie Allsopp would be proud.. if you don't know what she's into other than selling houses I am sure you'll come across her in a repeat of a reduce, reuse, recycle type TV program on one of the many digital channels at some point in the future.

I made an antenna out of what I had laying around yesterday too which was just up in the garden for the day. No photos.. they wouldn't be very interesting, it was just a sloping random wire for 10m - 20m. Mostly listened whilst doing other things, but had a few contacts on some of the bands in between from N Ireland to Russia. Surprising what just a bit of random wire can do when conditions are right.

I've yet to play on vhf/uhf. Have made note of your project for when I do as I believe the closest, or at least the most used repeater from me is about the same distance as the one to you.

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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeSun Aug 15, 2021 10:22 am

Hi Neal,

Cheers mate, was fun building it and also having fun using it.

You can't beat a good old 'Sloper' for simplicity and radio reward on HF so well done on that. 70cms Homebrew 6 Element Yagi-Uda Beam 1f44d 

Kirstie who? Wink Very Happy
(Never really been a big fan of TV but my missus brought me up to date.)


Yeah, get yourself on VHF/UHF Neal. Doesn't have to all be serious SSB competition stuff, the repeaters are great for getting to know Hams in your locality and I often listen to them in the background whilst doing stuff.

My nearest 2m repeater must be close as I can hit it with a Baofeng and the rubber-duck even indoors but there's never much traffic on there. (Can actually hear and open it on my old Yaesu FT227r hooked up to a dummy load!!)

The GB3OV repeater I mentioned can even open on low power on the Baofeng, (1W), with this homebrew beam! 

I'm looking forward to exploring more and even digging through old publications for further antenna ideas. Corner & Trough reflectors looked interesting but then I came across.......Bi-Quad Reflectors. Seems like that conversation we had a while back about the 'Duga' woodpecker array may make a scaled down appearance in my loft space after all. Very Happy


Did tempt me into looking at modern VHF/UHF rigs but I don't like the fashion for 'closed systems' on repeaters today with Fusion switchover and the like. Amateur Radio should be open for all to enjoy so if I can do it all with a Baofeng and some scraps of metal then it makes it much easier for others to replicate. Between that and fitting CTCSS circuits in my old gear it doesn't have to cost the earth either. 

.....besides, most of the 'kerchunkers' and random 'hub-net' dial ups on the repeaters seem to be other 'bored' Hams anyway. Wink


All the best,
Victor

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Victor
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PostSubject: Re: 70cms Homebrew 6 Element Yagi-Uda Beam   70cms Homebrew 6 Element Yagi-Uda Beam Icon_minitimeThu Aug 19, 2021 3:28 pm

Just to say a big Thanks to all of you that,

a) Read my waffle Wink and

b) Commented and Liked 70cms Homebrew 6 Element Yagi-Uda Beam 1f44d 


Much appreciated and made this old fart smile!



Also a big thanks to the true king of monster antennas  Andy591/P  to which examples such as his 4 Element Quad I can only aspire to.

Another HUGE thank you to another certain Charlie Tango member that saw fit to gift me something to help me along my antenna quests and fun......more on that another time, for now he shall remain anonymous. Wink


All my very best to all of you out there in Charlie Tango land. You're a very fine bunch indeed!

Victor

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