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FPV-PLASTICS
23rd March 2013, 07:34 AM
hi guys

i play whit transmittors and antenne,s for many jears
i think whit that background,,i love fpv

here my test centrum

http://www.mijnalbum.nl/Foto-DIKVUN6B.jpg

http://www.mijnalbum.nl/Foto-QVV4KGNQ.jpg


this 433 uhf ant is made whit spring steal

http://www.mijnalbum.nl/Foto-WPH8SP8D.jpg

i tune all uhf ant on antenne analyzer

http://www.mijnalbum.nl/Foto-RQ8LBVTD.jpg
i can test swr from 0 to 6000 mhz

inverted V and dipool for 1,2 or 1,3 comming soon

all antenne,s will be tuned on frequentie you want,s

for intrest contact me on email

FPV-PLASTICS
20th April 2013, 07:02 AM
http://www.fpv-plastics.com/FPV-Plastics/UHF_tuned_antenne.html

matix101
2nd May 2013, 10:00 PM
Robs uhf antenna equipped on my skyfun

2519625197

SENTRY
3rd May 2013, 09:37 AM
NICE!

matix101
4th May 2013, 10:18 PM
had a chance to test this antenna on my skyfun today and it worked great!! upgraded from a sander style monopole and the difference was night and day link quality never dropped below 80% with a ezuhf 4ch lite, frequently zeros out for a sec or two with the monopole, finally not watchin link quality with every bank turn, thanks rob ill be ordering another one soon for the 8ch lite

IBCrazy
4th May 2013, 10:23 PM
Rob - I was about to introduce a dipole for 433 MHz on a short but stiff RG142 coaxial cable (like I have on my Discovery). This would make a good addition to your line-up. I can give you my details if you like.

-Alex

FPV-PLASTICS
5th May 2013, 05:08 AM
had a chance to test this antenna on my skyfun today and it worked great!! upgraded from a sander style monopole and the difference was night and day link quality never dropped below 80% with a ezuhf 4ch lite, frequently zeros out for a sec or two with the monopole, finally not watchin link quality with every bank turn, thanks rob ill be ordering another one soon for the 8ch lite

Thanks matt for feedback

Have fun. Fly save

FPV-PLASTICS
5th May 2013, 05:08 AM
Hi alex

I got a short one to
Whit axtension coax,or mount strait on rx

http://www.mijnalbum.nl/Foto-UAO8QA6G.jpg



but you got my email

Alwase great to contact me

FPV-PLASTICS
6th May 2013, 04:52 PM
Hi

the antenne whit 25 cm coax is 8 gram
The antenne on sma is 6 gram

20 euro free shipping in envelop. World wide

syscons
6th May 2013, 04:55 PM
Would it be best to mount those V antennas like Dipoles, so one end pointing up on the Wing and one down?

How do they compare to a Dipole? Would be nicer to mount on a Wing..

FPV-PLASTICS
7th May 2013, 02:33 PM
Would it be best to mount those V antennas like Dipoles, so one end pointing up on the Wing and one down?

How do they compare to a Dipole? Would be nicer to mount on a Wing..

hi

the way matt mount hi antenne in post 3 that rocks

FPV-PLASTICS
7th May 2013, 02:45 PM
http://www.mijnalbum.nl/Foto-6XU8YIQG.jpg


http://www.mijnalbum.nl/Foto-YQKUIFNX.jpg


http://www.mijnalbum.nl/Foto-FUXNSOMH.jpg

IBCrazy
7th May 2013, 08:29 PM
@Rob - Mind your polarization. Remember to tell people your Vees are horizontally polarized when mounted like that.

I like your style. This is better to have a counterpoise and they're easy to mount.

-Alex

FPV-PLASTICS
8th May 2013, 11:17 AM
@Rob - Mind your polarization. Remember to tell people your Vees are horizontally polarized when mounted like that.

I like your style. This is better to have a counterpoise and they're easy to mount.

-Alex

Hi alex

You mean whit 6 gram you don t have a CG problem??

I like the 6 gram and flex spring steal

when your plane go nose down in the ground
The 6 gram ant don t rip out the sma from uhf rx

FPV-PLASTICS
8th May 2013, 11:17 AM
@Rob - Mind your polarization. Remember to tell people your Vees are horizontally polarized when mounted like that.

I like your style. This is better to have a counterpoise and they're easy to mount.

-Alex

dubble post,,,my cellfoon did that???

IBCrazy
11th May 2013, 10:11 AM
Rob,

For your feedline put this bead on it to balance the antenna and get a uniform radiation pattern: http://www.digikey.com/product-search/en?x=0&y=0&lang=en&site=us&KeyWords=240-2067-nd

This will keep the signal from tracking back down the outside of the cable shield. It fits perfectly over RG316 coaxial cable.

I am curious what kind of spring steel you are using? Most spring steel is difficult to solder.

-Alex

FPV-PLASTICS
11th May 2013, 10:47 AM
Rob,

For your feedline put this bead on it to balance the antenna and get a uniform radiation pattern: http://www.digikey.com/product-search/en?x=0&y=0&lang=en&site=us&KeyWords=240-2067-nd

This will keep the signal from tracking back down the outside of the cable shield. It fits perfectly over RG316 coaxial cable.

I am curious what kind of spring steel you are using? Most spring steel is difficult to solder.

-Alex

hi alex that,s for tips

for ant whit coax,,yes i can order some ferrit kern
never now where is for
whit fine tune the uhf antenne the analyzer say it,s oke

about the spring steal soldering

i find some soldering [ tin ] from 10 jears old
you can,t buy it anymore ,, not save,,jears ago they soldering water pijps whit it

this tin i have soldering real good on steal

IBCrazy
11th May 2013, 11:32 AM
Hmm... Good to know. Most solder I know is 40% tin and 60% lead. I just learned how to solder stainless steel using phosphoric acid. Apparently a 50/50 mixture of alcohol and phosphoric acid allows just about anything to be soldered together. The guy who showed me used potato vodka as the alcohol source. I'm not sure what the alcohol is supposed to do but I know the phosphoric acid etches the metal. This might be a good solution should you run out of your solder.

The reason for the ferrite bead is to help with what we call "skin effect". High frequencies travel down the outside of a wire. For a #0000 wire, only 125Hz is required for less than 100% skin depth. For a 22 AWG wire, all you need is 100kHz and almost all of the current rides on the outside of the wire. At our frequencies, the effect is so large that you can actually have a reverse current from the inside of the wire than you do on the outside of the wire. Think about the cable shield. You have a signal inside it, but skin effect causes a current along the outside of the cable. This causes the cable shield to act as a resonator and will throw off the radiation pattern which as you know is the most important thing to an antenna.

The way to fix this is you need to "choke" the cable. in other words, you need to increase the resistance of the shield to RF. One way to do this is to coil it up in a toroid. This works by turning the cable into an inductor. This is unfortunately bulky. However if we use a ferrite bead thngs get easier. Think of a it as a 1/2 turn transformer. The magnetic field couples with the ferrite and attempts to magnetize it. Since the relative permeability of the ferrite is to the order of 200 or more, this looks like a 100 turn inductor! This makes the impedance of the line go from a few hundred ohms to a few thousand! problem solved ;)

-Alex

Elmardus
12th May 2013, 10:57 AM
very very interesting. Does this ferrite ring have a good effect on all antenna's? I mean does it work for transmitter AND receiver antenna's?
Why aren't we using this on all cloverleaf antenna's? because if it improves radiaton pattern, why are we not using it? Or is it not for high frequencies like 5.8, and only for 433MHz....?

FPV-PLASTICS
12th May 2013, 02:26 PM
hi guys

good question elmar

do we need ferrit on clovers to

here my work from today

they are from spring steel,,real hard to make then
they are for myself,,i don,t sell stuff that,s no my idea or it,s must have a great mod

http://www.mijnalbum.nl/Foto-RKE7VUCC.jpg

FPV-PLASTICS
15th May 2013, 01:27 PM
Hi alex

About the ferrit
It s working like a ant matcher???

FPV-PLASTICS
15th May 2013, 05:34 PM
Hi alex back again

You have your one antenne s line


433MHz Turnstyle UHF Antenna (IBCrazy)
I can find any ferrite on your antenne

FPV-PLASTICS
16th May 2013, 02:11 PM
hi guys

i did some thinking and read on the net
talking whit a buddy about the ferrite story

alex we can,t buy balanced coax
so a balun really rocks
and ferrite whit more turns, rocks to

http://www.mijnalbum.nl/Foto-VIAWBHKO.jpg

http://www.mijnalbum.nl/Foto-H8NMDNIH.jpg

but on the net they alwase talking about a tx antenne

the 7 turn ferrite or better the balun fit,s into bigger planes

IBCrazy
17th May 2013, 12:27 AM
Rob,

This will save you a lot of time making baluns: <table border="0" cellpadding="0" cellspacing="0" width="781"><colgroup><col width="781"></colgroup><tbody><tr height="20"> <td style="height:15.0pt;width:586pt" height="20" width="781">http://www.alliedelec.com/search/productdetail.aspx?SKU=70065390</td> </tr></tbody></table>
Run the cable through the middle and the cable goes to ~3000 Ohms or so. That's plenty balanced. It fits an RG316 cable perfectly ;)

-Alex

IBCrazy
17th May 2013, 12:29 AM
hi guys

i did some thinking and read on the net
talking whit a buddy about the ferrite story

alex we can,t buy balanced coax
so a balun really rocks
and ferrite whit more turns, rocks to

http://www.mijnalbum.nl/Foto-VIAWBHKO.jpg

http://www.mijnalbum.nl/Foto-H8NMDNIH.jpg

but on the net they alwase talking about a tx antenne

the 7 turn ferrite or better the balun fit,s into bigger planes

Rob, this is a 4:1 balun. I would not recommend it for a straight dipole but it works really well for a folded dipole! A folded dipole (1 wavelength loop) is around 200 Ohms. The 4:1 balun brings it to a perfect 50 and balances it. Try it!

-Alex

IBCrazy
17th May 2013, 12:32 AM
very very interesting. Does this ferrite ring have a good effect on all antenna's? I mean does it work for transmitter AND receiver antenna's?
Why aren't we using this on all cloverleaf antenna's? because if it improves radiaton pattern, why are we not using it? Or is it not for high frequencies like 5.8, and only for 433MHz....?
Yes it does. Check my BluBeam Ultras. You'll see ferrite beads on them to balance them.

Some antennas can be geometrically balanced (my vee is a prime example of geometrically balanced). Others require a device balun such as the Crosshair (1/4 wave choke balun), Mad Mushroom (ferrite balun), or AMOS-5 (4:1 balun).

-Alex

FPV-PLASTICS
17th May 2013, 05:07 PM
thanks alex for feedback

i order 200 ferrite core

Nakelp86
25th May 2013, 09:36 AM
Subscribed

TNug
25th May 2013, 09:55 AM
@Rob - Mind your polarization. Remember to tell people your Vees are horizontally polarized when mounted like that.

I like your style. This is better to have a counterpoise and they're easy to mount.

-Alex

Rob &amp; Alex,
If one is to use a horizontally polarized vee, why not lay it down on the wing or embed in the wing for improved aerodynamics?

FPV-PLASTICS
25th May 2013, 10:26 AM
hi

mount your inverted V horizontal gif you the best 360 pattern


rob

Elmardus
25th May 2013, 01:27 PM
Rob &amp; Alex,
If one is to use a horizontally polarized vee, why not lay it down on the wing or embed in the wing for improved aerodynamics?

I think that should be possible, but does anyone know how the radiation pattern of a vee antenna is? If it doesn't have any nulls on the top and bottom it should be ok. And if you lay down you vee antenna, make sure you have the ground antenna horizontal too to prevent polarisation problems.

TNug
25th May 2013, 02:00 PM
I think that should be possible, but does anyone know how the radiation pattern of a vee antenna is? If it doesn't have any nulls on the top and bottom it should be ok. And if you lay down you vee antenna, make sure you have the ground antenna horizontal too to prevent polarisation problems.

I thought the radiation pattern was similar to that of a dipole - nulls along the axis - but with slightly higher directivity and larger nulls. I'm far from an expert though.

TNug
27th May 2013, 09:52 AM
This is vee radiation pattern, no?
http://static.rcgroups.net/forums/attachments/1/0/3/1/1/3/t3828023-138-thumb-SideVSM.jpg?d=1298695152
(got this from one of Alex's tutorial posts at the other forum)
For this discussion, it would be rotated 90 deg CCW.
My question was whether it mattered if the antenna was then rotated 90 deg about the z-axis - to lay flat or be embedded in the wing.

ChrisW
29th May 2013, 02:54 PM
Rob - Could you tune me an antenna to 459 MHz ??

I can get my Open LRS set up legal in the UK on 459 MHz by changing the firmware - but the Open LRS is sent set for 433Mhz with 433 Mhz antenna.

So this is a bad match - will be able to get much longer range if you could match antenna for me to 459 Mhz

Hope you can help

Chris

FPV-PLASTICS
29th May 2013, 04:06 PM
Rob - Could you tune me an antenna to 459 MHz ??

I can get my Open LRS set up legal in the UK on 459 MHz by changing the firmware - but the Open LRS is sent set for 433Mhz with 433 Mhz antenna.

So this is a bad match - will be able to get much longer range if you could match antenna for me to 459 Mhz

Hope you can help

Chris

Hi cris

Yes i fix a antenne for you on 459 mhz
No problem

Contact me on email

Btw. Order a Wiltron Anritsu SiteMaster antenne analyzer today
Scan ant up to 3,3 ghz

Go sleep now

ChrisW
30th May 2013, 06:52 AM
Hi Rob

Brilliant - email sent.

Cheers
Chris

FPV-PLASTICS
30th May 2013, 02:40 PM
hi

after some contact whit chris
i got more info

chris play whit this uhf set

http://www.hobbyking.com/hobbyking/store/__27096__OrangeRx_Open_LRS_433MHz_9Ch_Receiver.htm l?gclid=CICJh6KWvrcCFWfItAodsCUAyA

legal frequentie in UK is 459 mhz, so they have a software update in UK to switch from 433 to 459 mhz

i fine tune a tx antenne for chris to

http://www.mijnalbum.nl/Foto-E7XPVXGD.jpg

ChrisW
30th May 2013, 02:43 PM
Thanks Rob - Excellent Job In Super Fast Time To

ChrisW
31st May 2013, 09:33 AM
Any chance of a 459MHz inverted V for my X8 ??

Chris

FPV-PLASTICS
31st May 2013, 10:36 AM
I got type A and B.

if you got new or beter idea
Make a draw. Meybe we got type C soon

homemaranha
31st May 2013, 10:44 AM
Just to drop some comments on these antennas. I bought the one without a cable (antenna wires welded directly to sma connector - 2nd picture on the first post of this thread).


My setup is ezUHF with 8 ch diversity Rx. I use EagleTree gear and the RSSI reading is done using Mictronics device version 2 (the one who reads directly from the ezOSD port on the ezUHF Rx). It is calibrated on ET OSD Pro and values go from 0 (failsafe) to 100.
I was using the Sanders style monopoles on the RX (which are the antennas they send with the Rx).
My previous record is 13 kms where I get a reading between 15 and 10 (RSSI value). My Tx antenna is a diamond placed vertically.

With this antenna I get an improvement of 12 values on RSSI reading.

Don't forget that this antenna is horizontal polorized so the Tx antenna should be placed horizontally.

Well done Rob. Congrats on this one.

FPV-PLASTICS
31st May 2013, 12:26 PM
Just to drop some comments on these antennas. I bought the one without a cable (antenna wires welded directly to sma connector - 2nd picture on the first post of this thread).


My setup is ezUHF with 8 ch diversity Rx. I use EagleTree gear and the RSSI reading is done using Mictronics device version 2 (the one who reads directly from the ezOSD port on the ezUHF Rx). It is calibrated on ET OSD Pro and values go from 0 (failsafe) to 100.
I was using the Sanders style monopoles on the RX (which are the antennas they send with the Rx).
My previous record is 13 kms where I get a reading between 15 and 10 (RSSI value). My Tx antenna is a diamond placed vertically.

With this antenna I get an improvement of 12 values on RSSI reading.

Don't forget that this antenna is horizontal polorized so the Tx antenna should be placed horizontally.

Well done Rob. Congrats on this one.


thanks paulo for test and review

can you post a photo from your rc rx whit ant

FPV-PLASTICS
4th June 2013, 12:30 PM
This is vee radiation pattern, no?
http://static.rcgroups.net/forums/attachments/1/0/3/1/1/3/t3828023-138-thumb-SideVSM.jpg?d=1298695152
(got this from one of Alex's tutorial posts at the other forum)
For this discussion, it would be rotated 90 deg CCW.
My question was whether it mattered if the antenna was then rotated 90 deg about the z-axis - to lay flat or be embedded in the wing.

hi

did some thinking about a radiation pattern

free time is hard to find
but i think i got a way to make a pattern
whit some luck i recording the hole actie and make a you tube movie

FPV-PLASTICS
6th June 2013, 12:00 PM
Hi guys

in UK they need 459 mhz antenne,s

so i order some Nagoya na-771

i will fine tune them on 459 mhz

http://www.mijnalbum.nl/Foto-GZJPJW7I.jpg

ChrisW
7th June 2013, 03:59 AM
Hi Rob

I've just got a Hobbyking Orange Open LRS receiver working with my apm2.5 as a my datalink - I'm using an FTDI Uart to USB converter at the transmitter end to get the data into a laptop so I can connect to APM Planner - it all works really well.

I did a quick range test and its not very good - so thanks for making these antenna's for me. I'm hoping the range problem is just because the antenna that Hobbyking send with them are not very well matched, they are no good at 459Mhz for UK use anyway.

Thanks again Rob :)

Chris

Elmardus
7th June 2013, 08:26 AM
The hobbyking antenna's are really bad, and even worse on 459MHz. Rob's antennas will do much better! And I don't know what firmware you are using, but some custom firmwares for OpenLRS are much better than the stock one.

ChrisW
7th June 2013, 09:02 AM
Thanks for the info - I'd assumed they are not very good. I'm using Nigel's 459Mhz firmware - going to try OpenLRSSng firmware too. I've spent a couple of days getting to know the OpenLRS set up so swapping firmware now is no problem. Will report back how Rob's antenna go on 459Mhz

Chris

Wearyman
7th June 2013, 09:11 AM
So, if I'm undertanding this correctly;

When mounted in a "V" pattern, the polarization is horizontal, with the nulls pointing out to each side. But when mounted in a "<" pattern, the polarization is vertical, with the nulls pointing directly up and down. Why wouldn't one then mount it in the "<" pattern all the time so that you never have a null pointed at you when turning?

Or am I not understanding this properly?

FPV-PLASTICS
11th June 2013, 12:41 PM
yo my analyzer arrive

http://www.mijnalbum.nl/Foto-DIKVUN6B.jpg

FPV-PLASTICS
26th June 2013, 04:15 PM
hi guys







http://www.youtube.com/watch?feature=player_detailpage&v=X9iugNLlID4

matix101
4th July 2013, 12:14 AM
robs uhf antenna on my qav400 on ezuhf 8ch lite there a huge improvement over the sanders, especially on the lite with one antenna port thanks rob i love these antennas i gotta order a few more just to have on hand

2863228633

FPV-PLASTICS
4th July 2013, 07:06 AM
robs uhf antenna on my qav400 on ezuhf 8ch lite there a huge improvement over the sanders, especially on the lite with one antenna port thanks rob i love these antennas i gotta order a few more just to have on hand

2863228633


Thanks for your report

Rob

Imre43
16th July 2013, 04:39 PM
Today i flow 2,2 km whit my v antenna on my quad .
I had to go back Because my video Signal Went out of range.

This is te antenna
http://fpv-plastics.com/FPV-Plastics/UHF_tuned_antenne.html

And this is mij flight

http://www.youtube.com/watch?v=AoUu9KmivZk

FPV-PLASTICS
17th July 2013, 03:53 PM
hi

thanks for movie

what is your setup uhf rx??
and how is rssi now????? and before ???

thanks rob

Imre43
17th July 2013, 05:24 PM
Hi
My setup is Ezuhf from immersion
The rssi is stil 100% by 2,2 km and before I could not go feather than 1,5 km
Now i neef a new 5,8 ghz antenna because my video singnal went out of range

FPV-PLASTICS
19th July 2013, 09:38 AM
hi guys

for guys that order uhf ant

they are almost ready for shipping

http://www.mijnalbum.nl/Foto-LD3EX7ZC.jpg

rob

ummagawd
24th July 2013, 02:48 PM
I too am curious about mounting this as a "V" vs a "<". I like to fly low and through trees and so I would be afraid to snag the antenna on a branch. What would be the drawbacks of mounting this like a "<" but flat on the back of my quad (so that the v shape is parallel to the ground).

FPV-PLASTICS
24th July 2013, 03:32 PM
I too am curious about mounting this as a "V" vs a "<". I like to fly low and through trees and so I would be afraid to snag the antenna on a branch. What would be the drawbacks of mounting this like a "<" but flat on the back of my quad (so that the v shape is parallel to the ground).

hi

parallel mounting is not good,,then the ant watch 180 degree,,,and you like 360 dergee

some guys go testing inverted v antenna,s make from 0,6 mm spring steel super flex ,, you can hit every tree whit them,,whitout any harm on you sma

i wait for range test report,s

ummagawd
24th July 2013, 06:55 PM
Thanks Rob, what's the length of the antennas tuned for 433?

FPV-PLASTICS
25th July 2013, 03:06 PM
Hi guys. From camping

Around 17 cm high

Rob

ummagawd
25th July 2013, 05:17 PM
Thanks, and would the type b with coax extension have the same lengths?

FPV-PLASTICS
25th July 2013, 05:51 PM
On camping now

I will tell you when i m at home

But sent many antenne s

Meybe someone can post dimensions

ummagawd
27th July 2013, 04:39 PM
thanks Rob - I think I will go with your antenna... I just want to understand dimensions so I can choose the smallest, easiest to install on my quad. My props are very close to each other so I want to make sure they don't hit the antennas.

Also, is it OK to add an extension to the type A?

Does the type B and C have smaller length antennas with a smaller "V" angle?

thanks for your help, enjoy camping!

FPV-PLASTICS
27th July 2013, 05:50 PM
thanks Rob - I think I will go with your antenna... I just want to understand dimensions so I can choose the smallest, easiest to install on my quad. My props are very close to each other so I want to make sure they don't hit the antennas.

Also, is it OK to add an extension to the type A?

Does the type B and C have smaller length antennas with a smaller "V" angle?

thanks for your help, enjoy camping!

Hi guys

All type inverted V are the same length
I test whit extension cable and sma to sma conectors

My analyzer don t like it at all
Swr go up in frequentie
I need more testing about that

Or it s bad cheap hong kong stuff and you last proformance

I tray to find a strong way to bulding a dipole

But alex got them all ready

Have a look at them.

Rob

IBCrazy
27th July 2013, 10:47 PM
Rob - My secret to making a strong dipole is the tube in the center is filled with GOOP and thus flexes. Silicone would work as well. All you need is something that will allow flex but not stress the joint. I can help you with this and also help you with the issues you are having with stable readings on your analyzer.

Your analyzer needs to be balanced before you can get a decent reading. A cable balun between the analyzer and the antenna helps. Keeping a good distance between the antenna and any structure will also help. I can show you some experiments that will cause your analyzer to go crazy and this will help you understand RF better. You have the best learning tool in the World. Now all you need is a few experiments and the World of RF will open up to you and you'll be making all kinds of stuff just to do it. You can even use that analyzer to get radiation patterns and such. It takes a little work, but it is a great tool. I can even show you how to read axial ratio with it.

-Alex

FPV-PLASTICS
27th July 2013, 11:40 PM
Hi alex

I don t whants to copy your dipole. Lol. And not i a hurry
I got i fine originale calibaratie sets whit analyzer

And i think you mix up my analyzer whit a more exensive one

About sma connetors
When you connect more then one on originale wiltron connector
The 1:1 frequentie move i little

Some connectors you can buy for 4 dollar
Same wiltron look a like cost 150 dollar

i can t see if all that good looking brass stuff from hong kong is real 50 ohm or 75 ohm

It s all bling bling stuff

Rob

FPV-PLASTICS
27th July 2013, 11:41 PM
Hi alex

Look about this cable

http://pages.ebay.com/link/?nav=item.view&id=120486995659&globalID=EBAY-NL

Can you tell me way the price is so high

Rob

IBCrazy
31st July 2013, 12:34 PM
Rob - I honestly have no idea why this is so expensive. It's just a cable.

-Alex

FPV-PLASTICS
31st July 2013, 01:04 PM
Oke thanks

Meybe this cable is semirigid
But real special. And for long live
High ghz cable. Save for body and brains
If you works every day whit high frequentie s
Meybe fine tune cable on ohm

Thats way i think there is a big difrent between
Hong connectors. And good brand. Stuff


Rob. From camping

appelm
4th August 2013, 08:17 PM
I received two antennas from Rob for my quads. I have to say they are really very nice. Professional craftsmanship. I'm very pleased with the look and the ease of installation. I say that because installing a dipole on a quad can be very cumbersome. These just screw on to my dragonlink receiver.

So how about performance?
I have two quads. One has a short RMRC dipole mounted vertically. The other has a sander-style monopole. I like the monopole because, like Rob's antenna, it can easily be removed for transport. But the range suffers. I did range tests with my dragonlink on each quad before and after installing the new antennas.

Sander-style monopole: 45ft to failsafe
RMRC dipole: 70ft to failsafe
V antenna: 70ft to failsafe

The v might have even been further but I'll call it a tie. So far so good.

I took them both out flying today. I had a great, reliable experience. No scientific testing, per se, but I flew for about 8 packs and the performance from my dragonlink was perfect, no failsafes. I will keep using them and report back if I notice any drawbacks to these. For now, I'm very happy with them on my quads.

Here are some pics:
30211
30212
30213
30214

FPV-PLASTICS
5th August 2013, 09:50 AM
Hi

Thanks for your report marc

Rob

HydroThief
23rd December 2013, 03:20 AM
Would it be best to mount those V antennas like Dipoles, so one end pointing up on the Wing and one down?

How do they compare to a Dipole? Would be nicer to mount on a Wing..

Yes, I did some testing.More testing is needed but conclusion so far is that vertically polarized V is the best. I test vertical dipole, horizontal 110* V and vertical 90* deg V all DIY
Horizontal V was the worst and yes I mounted TX antenna horizontal for this.
Vertical V got rid of 2 problems with the dipole. #1 is dipole element snapping of every couple of flights from bending when contacting the ground and #2 is the dipole nulls
Here is some video to show the problem every throttle cut is a fail safe.There is no video of vertical V because I haven't had a single fail safe yet ( 2 flights) Note this is all within 0.5KM on 433Mhz at 200mw
<iframe src="//player.vimeo.com/video/82531229" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen="" frameborder="0" height="281" width="500"></iframe>

Attached is a photo of the installations

schugabe
23rd December 2013, 04:23 PM
Interesting results! Is the vertical polarized V mounting visible in the left or in the right image you posted?
However, I think it isn't a good sign if a failsafe happens within 500m with any of these antennas.

FPV-PLASTICS
23rd December 2013, 04:31 PM
Hi guys

Are there more test reports

I love feedback

Rob

rclover106
9th August 2014, 10:30 PM
Is this antenna a good match for the IBCrazy Moxon Rectangle UHF? Thanks!

FPV-PLASTICS
12th August 2014, 05:11 PM
Hi

Yes the moxon is hor / vertical. So yes they match

Rob

FPV-PLASTICS
1st October 2014, 03:38 PM
http://youtu.be/X9iugNLlID4

Rob

FPV-PLASTICS
10th March 2015, 05:41 AM
hi guys

get more and more mail about diversity set

so here some photo,s

http://www.mijnalbum.nl/Foto-J8V63THQ.jpg

http://www.mijnalbum.nl/Foto-GTCWSES4.jpg

http://www.mijnalbum.nl/Foto1k0-HAEZE8RM.jpg

I bulding them from spring steel
And fine tune on analyzer. The frequentie you want s

Rob

gulasch
14th March 2015, 03:27 PM
Received mine yesterday and tested the antenna today.
My old Sander style Monopole is no match to the V at all.

FPV-PLASTICS
15th March 2015, 04:54 PM
Received mine yesterday and tested the antenna today.
My old Sander style Monopole is no match to the V at all.

thanks for feedback
no more beeps and failsafes behind treeline,s lol

have fun rob