HAM RADIO: Dual Band High Gain Flower Pot Antenna. Experimental DBHGFP Antenna
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- Опубликовано: 19 ноя 2020
- Dual Band High Gain Flower Pot Antenna. Experimental DBHGFP Antenna, A challenge laid down by M7MNP, thanks Mav.. Anyway the credit here must go to VK2ZOI, the real genius behind the antenna.
I have followed the nicely laid out instruction on his website and made the antenna for you to enjoy.
vk2zoi.com
The build took me around 4 hours so what you see here is a 30min follow me video. I do hope you enjoy it and subscribe for more..
Many thanks
Mike - M0MSN
To get notified of the next upload .click that bell and subscribe.. 
Наука
I'll make one this weekend for my SDR. Just got into this whole HAM radio business during quarantine and it's been fun so far
Just made it as my first antenna build, made a bit more complicated for myself, i used a 3m length of amazon rg58 with connectors, so i chopped one connector off and end feed it from the base, definitely fun build. Thanks for the vids.
I made one of these yesterday and used a clear pvc pipe. The results are pretty astounding and being able to see the element helps to place the foils sleeves perfectly.
Nice work!
Outstanding job as usual.
Another great video Mike :)
Thanks again!
/Sees 30+ minute antenna build video from Mike. “Relatively easy but challenging.” I am beginning to get a sense of Mike’s level of effort scale. These are some of the best build videos available and a great service. Thanks much.
Glad it was helpful and many thanks..
Thanks Mike.
Nice work Mike, I needed a Pro to show me how to build it.
Hope you find one... LOL
Thank you, again.
Hi Mike, I have built several of those. With excellent results (40 miles 2metres high on test rig outside) I use one inside, again with great results. I also scaled one for 4metres, Again with great results.
Hi Mark Thanks for sharing mate..👍👍👍
Thanks Mike! I love these Flower Pot antennas. I´ve one (ordinary type) in mobile use on my car top. There are two tube rails on both sides and I´ve fixed there a small wooden "adapter" with a hole for the antenna: easy to install and remove. The antenna itself is made of 16mm pvc-tube and only the coil section is wrapped on a tiny 25mm pvc-tube; slim size in mobile use - hi! I´ve used an alu-tube (not alu- or silver foil) for the 70cm purpose: easy to tune to optimum SWR and does not effect on 2 m. Looking forward to receiving your new videos. 73 de Kari OH2BCY!
Great Idea for mobile use..
Another great video Mike!
Loved the refernece to Gollum! 🤣
Thanks! 👍😁
I make ⅝ lambda from same source. And still work. I use cheap TV 75 ohm cable and bamboo stick to hold antenna. Last 3 year is everyday in use.
You said it was simple, looked really complicated to me. Nice to see you back in the kitchen, your normal habitat :-)
Thank you! 😊
Nice build Mike 👍👏👏
Thanks Mark 👍
Good build and instructions Mike. I did fear for the kitchen scissors though...”Mike, my scissors are blunt”.....”...are they luv? 🙄”
Very interesting I will give it a go sometime. Great video 👍🏻
Please do!
Mike, not only was that antenna a good bit of work, the video must have been a lot to weave together. Top notch job on showing the parts that matter. Thanks and 73
Many thanks Don. :)
I built One five years ago. It works very well. 73
a Master at work.
Thanks Paul
Hi Mike! Thank you for showing us how to do it. After looking at building one myself before you made the video, I finally gave it a go. The finished antenna gave me an SWR of 1.22 to 1.34 on the VHF band and 1.11 to 1.30 on the UHF band. That is, just taking the measurements given by VK2ZOI on his website. As of this writing I have yet to put it up on the roof, as my ladder is borrowed by a neighbor and hasn't returned it yet. But, things look promising and is thinking of replacing my (another) homebrewed QWGP that I currently use. Thank you and 73.
Elmore (4G1FBL), from the Philippines
Sounding Good.
@@mike-M0MSN hi it's me again. I've managed to put the antenna up on the roof and got myself much clearer RX and TX reports from my mates. However, the SWR for the VHF band increased slightly from the 1.22 to 1.34 range up to the 1.40 to 1.50 range. It's still ok I know, but could be better I think by tuning it to the correct frequency.
The frequency sweep from my NanoVNA (drive.google.com/file/d/1Ja1hQTo-gMMrcrob9xyZAPGN78xsujy6/view?usp=sharing) indicates that the resonant frequency is somewhere around 139.2MHz. To tune it to the 144MHz-146MHz range I need to shorten the antenna a bit. Question is where? Do I cut at the top portion of the antenna or at the bottom (in which case I have to redo the entire antenna)?
@@elmoreignacio8741 just cut at the top and top of the lower section as you have two 1/2 waves on top of each other if you know what I mean??
Or you could just live with the SWR as it is!
Oh no ! The wife's best sewing and dress making scissors ! Still needs must :-) .
You got that right!
Great build! I will need to adjust for U.S.A bands but great idea!
Airband version was extremely positive, I centred it on 127MHz and it pulls in stations that are not possible using the Watson 881. The big bonus is very low background noise. UHF also is OK, certainly no worse than the Watson.
Mike.. Now I've just watched this one.. I think I'll build this instead! :)
Beatiful
Very interesting 👌👌 thanks 🙏
Most welcome 😊
Very nice build Mike. Could you cover the silver foil with heat shrink too? Protect from the elements a bit? I do enjoy these videos. Thanks mate.
Great suggestion Tom, without a doubt it would improve the longevity. stay safe mate. :)
Have you a link to the foil. Thanks
DESDE MONTEVIDEO URUGUAY ..EPCEPCIONAL PROYECTO ..FELICITACIONES ,,BUEN TRAVAJO Y MUY PROLIJO ..CX1BAN 73 CORDIALES 11 11 2022
Hmmmmm. Interesting aerial if I were interested in 2mtr and 70cms. I would have to do it in black, disguise the foil and wrap it in plastic ivy. But then the wind I get here would just snap the plastic! Multiplying it up for a lower band would make it a bit large though and would definitely snap or just fold over. Time to put in yet another permissions form for aerial(s). Annoyingly I did have permission before I moved in but didn't get the letter, now both persons have left and the computer says NO!!!
Nice one Mike, quite a tidy aerial, though looking at the bit of paper you had looked a bit confusing, but when you were half way through I had caught up with what you were building. Excellent.
Thanks Bob, going to have to put the thinking cap on to design an indoor for HF???
@@mike-M0MSN Yeah, I can just hear the missis if I put something up inside. A false downpipe for a gutter perhaps? A DX Commander right up the gable end, but there is a drive there and no chance of getting radials in for a ground plane! In fact the whole of this garden is slabbed for easy maintenance. That reminds me, another permissions form to be done this week. They have to give in before I will, I hope. "Can I put up huge aerials on your land please :-))" I can guess the answer, but no harm in pushing it.
my neighbour recieved lightning damage some years back. I have no problems erecting 'lightning conductors' all over the place now. 160m L antenna is a washing line.
Brilliant lol
Very good antena mr maik 73/51
Hi Mike - Many thanks for the video - I intend to try to make one of these myself in the next few weeks.
A question if you have a moment. The details state that the pipe would be 25mm, but the pipe available here in the UK is 21.5mm.
Would I need to adjust the length or number of turns of the phasing coil on this thinner pipe? I think the bottom coil forming the choke shouldn't be too critical (as I understand, I should use the length of the coax stated as the main guide).
I was thinking of putting foil around the coax rather than the pole, and hide it away inside - Do you think that's a silly idea or might work? Thank you G7PAC
Yes, the phasing coil is a quarter wave length (If I remember) so just work out that length and do a dry run to find out where you need to drill.... good luck
Have been re enjoying these antenna builds. Have a question about coax selection, would there be a difference in performance if using mini 8 vs rg58 mil spec vs aircell 5 etc. ( in the gainmaster rebuilding mentioned using better quality coax but could not find comments on performance improvements)
There is no real advantage in using better quality coax for the antenna itself, other than perhaps power handling and longevity, but it is a must for the feeder. :)
Great job! Thanks! 73 de LA6UOA!
Thanks 👍👍👍
Hi Mike. Thanks for making the video of the build. I'm in need of a VHF/UHF antenna, so after watching, wouldn't mind having a go at building myself one of these for regular use at home.
The question I have for you sir is; after having built two flowerpot antennas, the regular dual band one and this experimental high gain one, what would be your verdict and thoughts about the two antennas? - We saw at the end of the build of the regular one that it performed well. At the end of this build, we saw you checking the SWR, but not trying it out for performance! - Did it turn out to be a good antenna? Was it's performance better than that of the regular one? Was the extra effort involved in building the worth the extra effort over the regular one?
Regards David M0XQZ.
both antennas work well for what they are it's Horses for .... each antenna has its place and for me the extra work is worth it. with a slight increase in gain the larger version is the one I still have in use.
Would be interesting to analyse the antenna before and after the silver foil....
Hi. tell me please, how many turns ofRG58 on PCV 32mm? I dont have 25mm
Is there anything you can do for the SWR on 70cm band as 1.5 is a bit high for me
I'm very new and nieve could I hook this straight up to a Baofeng uv5r?
This was the first home brew antenna I built that worked out of the box. VSWR was 1.01 at middle of the 70cm repeater band and 1.3 in the middle of the 2m band. I used 13mm PVC pressure pipe with end caps and brought the feed out through the centre of the bottom cap.
Ottima antenna fatta con cavo sat 75ohm...
yep
I have been looking at that Experimental DBHGFP Antenna for a week now.. You made it look easy.
I am going to give it a go. where is the best, cheapest place to get the Military spec RG58 here in the UK, I see loads of places selling it. but they all have different specs and sizes !
What's the best one to buy, or where's the best place to get it from?
I got mine from Moonraker or it may have been ML&S??
Hi Mike great video did you ever try it out on the prm frequency 446 mhz for the vswr only asking as I was looking at this one for the 2 meter/70 cm and form band's
Never looked at PMR, but would work with a small trim.
All this work well with TV 75 ohm coax I try and work.
Mind that oak worktop!
yes....
Mike, in the same way that you soldered in the 1.5mm wire for the top section, could you have soldered in a length of the same wire for the lower de-braided section?
Yep..lol
Why don’t my homebrew antennas ever look as good as yours Mike? Built several following along. Mine work, but they always look rough. Oh well, practice I guess.
I'm having hard time finding a 25mm pvc pipe in US. Can I use 26.8mm pipe? The length of the cable for the coil in the middle will be 720mm in this case
Yes go for it
This seems like a very good build, but can you tell me what gauge copper wire did you use for the top section?
1mm
how critical are those measurements,.. I've just built one from tubing from B&Q (says 21.5mm diam). For the top coax coil you say 70cm, but the diagram on vk2zoi says 670mm. I ended up with 8 windings for the top coax coil, instead of 7,... does it matter that much?. Also, how critical is positioning of the foil sleeve, does it HAVE to cover the whole circumference of the tube ?,... tnx G4FBC
Hi Ron, If you are using a smaller dia pipe than the coil will need to be longer i.e the one turn you have, the foil will need to cover the pipe fully, be give it a go, building it is half the fun.
Thank you Mike.
How good this on Marine VHF. 156 MHz ?
no idea, It would need to be a little shorter but it should work fine.
Mike, How are you with a router??? as you really do need to get one of those metre long stainless steel rules inlaid into the worktop, just think how much easier it would make life for you, maybe Santa could bring you one eh.. Super as ever Mike.. Love watching the vids... Whats next (apart from the routing)???
I love it
Hi ! Is this a 6m flower pot
could you please tell me what are the materials you use. im a newbie and i really dont know na names of materials.. im planning to make this antenna.. thanks in advance..
Good work well done can you use it on pmr as well
Yes you can! with a bit of tweaking
Hello, I made this antenna, it works really well... how do you estimate the gain, and the maximum admissible power please... Thank you... I'm a fan of your videos... 73
So what's the gain on one of these?
Neat idea for a dual band stick, just wish your microphone was a little better used. Much is lost on the audio end.
I record on an iPhone and mix with Final cut, will take your advise and have a go. :)
How much coax and cable did you use for this build?
about 5 Meters ?
...correction 19mm pressure pipe (25mm OD)
Mike, the diagram shows 447mm from lower co-ax inner to the top of the 9-turn coil… you mention 43.6cm… is your measurement more accurate?
I am currently building this specific DBGHFP antenna. 👍 73 M0RAV
Horses for courses its a guide, some wire has a better velocity factor than others, you can alway cut, so make it longer...
Hi Mike, most interesting, could this be adapted for VHF/UHF Airband?
yes I would think so.
@@mike-M0MSN Would the foil shield still be the same length. I don't intend to purchase a meter to check, it's a one-off!
@@robertyuill3759 As a receive antenna you will not need the foil.
Hi there Mike i love your channel and i am a subscriber. Iwant to make a sugestion for you to build a G5RV with the twist of a mystery antenna i have build one and it worked great from 80 to 6 meeters. What do you think do some research and let us know. Have a good one. Stratos KE5I 73
Cool idea
Parabems pela antena amigo aqui minha cidade uberaba usamos repetidoras de vhf uhf
Muito obrigado
Hi, nice job as always, love your channel, i recently have made this antenna but i can't explain why the swr in 2m is like 1.02 and on 70cm is around 3.00. i followed all the instruction as precisely as I could. Can you help me? do i need to change or check some particular thing? thanks for the help if you can
Remove the tinfoil, aluminium from the pole and SWR the antenna again, you should have a reading around the same as on 2M.. ??
@@mike-M0MSN for "the pole" you mean the upper part or should i remove ALL the aluminium from the antenna ?
at 430mhz it has a very low impedance about 11-13 ohm
the lowest SWR is around 399 MHz, why i have the frequency shifted back ?
@@nameless777i remove all the aluminium top and bottom, and it looks like you have the bottom driven element a little long it maybe the coax type, if the velocity factor is better than .66 you may need to shorten the elements a little. But great work need a little practice.. 🤪
How about the uhf where the SWR result
Build it and find out: TBH. I forgot to include it in the video...LOL
I'm challenged too....
lol Can you not get help??
@@mike-M0MSN I think that I'm beyond help
How about the swr result in uhf?
It’s ok around 1.2:1
Excuse me sir
I'm no troll
But just where is it going to be put
In a flower pot or on a tree 🤔🤔🤔🤔🤔🤔
hello, tahapan yg terlebih dahulu di masukkan ke dalam pipa vpc tolong di buat secara jelas ,karena video nya anda langsung terpotong.
dari memasukkan cabel pertamanya dari lobang yg mana?
Mohon maaf, silakan kunjungi tautan ini vk2zoi.com/articles/dual-band-high-gain-flower-pot/
Halow...may i know, how max watt power this antenna can handle ???
100W maybe
Ok thaks...
It is with great sadness that we share the news that John Bishop VK2ZOI (VK2BK), long-time President of Hornsby And Districts Amateur Radio Club (HADARC), became a silent key in the early hours of Friday, 29th January 2021.
Sad news indeed.
need help for dimensions for gmrs band
Everything is divided by 300 and then again by 4 and then x .95
ANTENA CAPRICHADA
Sodaed ?
SoLdered
259 ye gads its vhf uhf not hf N Type is the only one to use
So sorry for my Devon accent, oh N Type, must ask the radio’s manufacturer (Icom) to change the input on the back so I can use an N Type..... lol.
@@mike-M0MSN :-) thats ok it just gets up my wick with some that try to americanise everything you dont sound heavy Devon
@@mike-M0MSN why they put so239 on vhf/uhf sets i do not know yet another thing to please the American maket ..ho humm Pete G6NJR .. north shropshire with a black country accent
@John Cliff dont know why people think "N Type" are difficult they also say LDF4-50 is hard to put connectors on piece of cake
Holes! Holes! not hose!
4 candles
Inclement ? Piss'n down you mean......... 😊
I gotta Boat.. LOL
So many intro!....... Haaayyyyy 😒😒😒😒😒😒😒😒😒😒😒😒😒😒😒😒😒
WHHHYYY NOTT DUDE
Good job. Make a flower pot antenna for gmrs radio (462-467 mhz) , whenever you can.Thanks.