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Old Oct 24, 2010, 04:04 AM
fpv rules
netherlands
Joined May 2010
29 Posts
Try a flexayagi ,nice and not heavy.
http://www.flexayagi.de/
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Old Oct 24, 2010, 06:00 AM
Stuart
srnet's Avatar
UK, Cardiff
Joined Dec 2008
3,289 Posts
Plenty here, the ZLs are shorter than a conventional yagi;

http://www.moonraker.eu/Amateur-Radi...l-Yagi-Antenna
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Old Oct 24, 2010, 06:07 AM
Registered User
Old Blighty
Joined Apr 2010
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Lots of 433 MHz Yagis below. A 433 MHz patch too!

http://www.wsplc.com/acatalog/Tonna_Yagis.html
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Old Oct 24, 2010, 06:19 AM
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Austria
Joined Feb 2007
6,411 Posts
David22, I'd like to avoid using a booster if possible. the reason we need a yagi is to blast through houses far away, as we want to fly 40km but at ground level. I can take a dropout of the video for 2-3 seconds, but control must be strong. That dictates we always have 20dbi margin, which we don't this far out. So we must use high-gain yagis (9 - 11dbi) in order to up the power to the required level.

thanks for all the suggestions guys, I'm looking through them right now!
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Old Oct 24, 2010, 08:16 AM
Stuart
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UK, Cardiff
Joined Dec 2008
3,289 Posts
ZL Specials are the way to go, for a 12.5dbi gain a standard yagi is 190cm long, the ZL special is 110cm.

Same price, 50.
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Old Oct 24, 2010, 08:36 AM
I LIKE WAFFLES....
SENTRY 62's Avatar
Powder Springs, GA
Joined Sep 2010
2,452 Posts
Am I missing something?? I didn't know you were on 433 Trappy.
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Old Oct 24, 2010, 08:41 AM
Registered Loon
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South Africa, WC, Knysna
Joined May 2006
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Quote:
Originally Posted by SENTRY 62 View Post
Am I missing something?? I didn't know you were on 433 Trappy.
uhf dewd
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Old Oct 24, 2010, 09:42 AM
I LIKE WAFFLES....
SENTRY 62's Avatar
Powder Springs, GA
Joined Sep 2010
2,452 Posts
Aaaaah - right on!
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Old Oct 24, 2010, 10:44 AM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,542 Posts
Quote:
Originally Posted by trappy View Post
David, I saw those, they're $150 - $250 on that site (if I remember correctly). add to that another $40 in shipping minimum ...

Moe, Alex = IBCrazy?
I'd recommend a different antenna rather than a standard Yagi. Perhaps a loop Yagi or a BiQuad would be better?

What gain are you looking for? Here's a 12dbi unit: http://www.directivesystems.com/PDF/DS432-11R.PDF

-Alex
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Old Oct 24, 2010, 11:29 AM
Unlimited FPV
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Latvia, Riga
Joined Jun 2010
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Old Jan 03, 2011, 11:54 PM
More Combat Please!
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Utah
Joined Dec 2003
7,914 Posts
Okay, I've been thinking all along that Yagi's were used for video reception over long ranges. But if you're using Yagi's on UHF frequencies, then are you using them to SEND your RC signal to your UHF receiver onboard the plane?

Pardon me for my ignorance, but this is the first I'm hearing of that.

So do you guys have 433mhz Yagi's for RC transmission AND 2.4ghz Yagi's for video reception on a single base station?

I don't understand how you'd manually point those antennas, seems like you'd need an antenna tracker to be accurate.

Are there any antenna trackers that would work with the DragonLink? I like the DOSD+, so I'm thinking DL all the way on my setup. But the EzUHF is the only one I've seen that has the antenna tracker features as part of the product suite.

Sorry, questions on several topics, but would love feedback from the "pros" on this thread.

Many thanks!

Todd
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Old Jan 04, 2011, 01:27 AM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
18,680 Posts
you put both yagi's on a pole that can be aimed at the plane.

both yagi's are in the same polarization and alignment.
But spaced apart by a minimum of 70 cm
the video yagi goes on top because it is the weakest and needs more height

you do the manual aiming by useing the video reception

when in close for like inflight flying, or to land, the manual aiming is not really needed, the video is good for flying close range with a video yagi and uhf is for sure not needed to be aimed at close range.

Divercity, antenna trackers and other things are just a possable weak link that could cause you future problems IMHO

I like to keep things as simple as possable



Quote:
Originally Posted by Wind_of_Change View Post
Okay, I've been thinking all along that Yagi's were used for video reception over long ranges. But if you're using Yagi's on UHF frequencies, then are you using them to SEND your RC signal to your UHF receiver onboard the plane?

Pardon me for my ignorance, but this is the first I'm hearing of that.

So do you guys have 433mhz Yagi's for RC transmission AND 2.4ghz Yagi's for video reception on a single base station?

I don't understand how you'd manually point those antennas, seems like you'd need an antenna tracker to be accurate.

Are there any antenna trackers that would work with the DragonLink? I like the DOSD+, so I'm thinking DL all the way on my setup. But the EzUHF is the only one I've seen that has the antenna tracker features as part of the product suite.

Sorry, questions on several topics, but would love feedback from the "pros" on this thread.

Many thanks!

Todd
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Old Jan 04, 2011, 01:57 AM
More Combat Please!
Wind_of_Change's Avatar
Utah
Joined Dec 2003
7,914 Posts
Okay, that's totally awesome. Thanks for the info David.

I just placed a HUGE order for 2.4ghz AV gear, following Trappy's recommendation. I must wait a little while to build up the funds to get the UHF stuff. I'll fly 72mhz to begin with in close range while training and getting used to flying through a camera, then get the UHF gear with another Yagi on 433mhz for long range stuff.

I had no idea you guys were pointing your Yagi's manually. I mean, the way the BlackSheep guys fly, I can't imagine they'd have a free hand to do that sort of thing! So if your signal starts to get a bit blurry, you just start moving your antenna around until it cleans up?

Wow. Low tech, but puts control of the entire experience in the pilots hands. I kind of like that.

Gives new meaning to the phrase "Mad Skills"! Ya gotta be mad to do that, and it sure takes skills!

So, question about the video transmitter. Do you just use the little 2.4ghz black antenna that it comes with for video transmission, or do you use something fancy for that as well?
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Old Mar 23, 2014, 11:54 PM
Registered User
Australia, VIC, Berwick
Joined Oct 2013
531 Posts
Quote:
Originally Posted by ganapati08 View Post
I'm after something as high gain as possible for openlrsng lost plane beacon. Anyone got any simple DIY instructions I can follow like this one but higher gain.

I need to check but I think beacon is around 450-460 MHz.

Thanks for the help.
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Old Mar 24, 2014, 02:45 AM
Stuart
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UK, Cardiff
Joined Dec 2008
3,289 Posts
Do a Google on 'DIY 70cm yagi'

You should find plenty of examples out there.
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