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Author Just ordered
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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29th Mar 13 at 20:08   View Garage View User's Profile U2U Member Reply With Quote
Its actually at a nice angle, you shouldnt ever point a rubber ducky at the object as you will hit a dead spot, 90/45 degrees is perfect, although i can angle it to whatever really as its adjustable

[Edited on 29-03-2013 by Steve]
DaveyLC
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29th Mar 13 at 20:12   View User's Profile U2U Member Reply With Quote
Its a linear antenna Steve, it should be polarized the same as the main RX on the copter.. The loses are PHENOMINAL for being out of phase.
Steve
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29th Mar 13 at 20:18   View Garage View User's Profile U2U Member Reply With Quote
Its an omni directional antenna

watch this vid, its quite informative

http://vimeo.com/8826952
DaveyLC
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29th Mar 13 at 20:20   View User's Profile U2U Member Reply With Quote
Its a linear antenna.. The fact it has no reflector and is Omni has NOTHING to do with it..
Steve
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29th Mar 13 at 20:21   View Garage View User's Profile U2U Member Reply With Quote
watch the vid dude, an omni directional pattern has everything to do with it

[Edited on 29-03-2013 by Steve]
DaveyLC
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29th Mar 13 at 20:22   View User's Profile U2U Member Reply With Quote
..Don't mix up Omni-direction and circular-polarization they are two VERY different things.
Steve
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29th Mar 13 at 20:23   View Garage View User's Profile U2U Member Reply With Quote
http://en.wikipedia.org/wiki/Omnidirectional_antenna

quote:
In radio communication, an omnidirectional antenna is an antenna which radiates radio wave power uniformly in all directions in one plane, with the radiated power decreasing with elevation angle above or below the plane, dropping to zero on the antenna's axis.


[Edited on 29-03-2013 by Steve]
Ian
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29th Mar 13 at 20:24   View Garage View User's Profile U2U Member Reply With Quote
The pattern is very all the way around it. Sound.
DaveyLC
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29th Mar 13 at 20:27   View User's Profile U2U Member Reply With Quote
The waves are polarized though so the rx antenna needs to be of the same polarization.. Yes the waves being emitted have a generally equal gain around the centre of the antenna (with dead spots top and bottom) how ever the antenna IS NOT circular polarized.

Clover leaf, skew-planar and time-phased bi-quad groups / patch groups are circular polarized.
Steve
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29th Mar 13 at 20:28   View Garage View User's Profile U2U Member Reply With Quote
I know what daveys saying, and is right to that degree.

Im going to play around with it like it is, i only really need to worry if it drops out before my FPV does, if it does I can simply relocate the antenna to the stock location on the radio
DaveyLC
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29th Mar 13 at 20:30   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Steve
I know what daveys saying, and is right to that degree.

Im going to play around with it like it is, i only really need to worry if it drops out before my FPV does, if it does I can simply relocate the antenna to the stock location on the radio


I'm 100% right..

General rule of thumb being out of polarization by 90 degrees gives you 1/10th of the power at the RX end. The efficiency goes right up the shitter.

So your super-doper Chinese wifi-booster which is probably massively over quoted on power (the Chinese always lie to sell stuff) is completely pointless because your antenna is so poorly positioned and polarized you might as well have not bothered.
Steve
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29th Mar 13 at 20:32   View Garage View User's Profile U2U Member Reply With Quote
Dont worry I know not to expect massive quality from the asians

Its already matched the stock setup in terms of range at 1.2kms so its not made anything worse

I think il take a drive with the drone and leave the tx at home switched on
DaveyLC
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29th Mar 13 at 20:33   View User's Profile U2U Member Reply With Quote
Pointless range testing on the flat, you'll get no where.
DaveyLC
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29th Mar 13 at 20:33   View User's Profile U2U Member Reply With Quote
This s what you want, nice circular polarized waves

DaveyLC
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29th Mar 13 at 20:35   View User's Profile U2U Member Reply With Quote
If I've learned anything from this hobby steve, it is to listen to the people who have been there, tried it, done it and picked up the piece of smashed plane/heli
Steve
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29th Mar 13 at 20:36   View Garage View User's Profile U2U Member Reply With Quote
where can i pick up a 2.4ghz circular polarised antenna? cant find any of ebay, I could bung my spironet one on but thats 5.8 wouldnt work right?
Steve
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29th Mar 13 at 20:38   View Garage View User's Profile U2U Member Reply With Quote
what about these cunts?

http://www.ebay.co.uk/itm/FPV-5-8-2-4Ghz-1-3-RP-SMA-Antenna-Kit-Skew-Planar-Cloverleaf-mad-mushroom-/140943053988?pt=UK_ToysGames_RadioControlled_JN&hash=item20d0dc54a4

[Edited on 29-03-2013 by Steve]
DaveyLC
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29th Mar 13 at 20:39   View User's Profile U2U Member Reply With Quote
Theres a SHIT HOT bloke on RGGroups called markus123456 who owns a network anaylzer.. He can make you a matched pair of 2.4ghz C/P antennas (1x C/L, 1x SPW).. I paid 50 odd quid for a matched pair and they were spectacular.



You will need
DaveyLC
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29th Mar 13 at 20:40   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Steve
what about these cunts?

http://www.ebay.co.uk/itm/FPV-5-8-2-4Ghz-1-3-RP-SMA-Antenna-Kit-Skew-Planar-Cloverleaf-mad-mushroom-/140943053988?pt=UK_ToysGames_RadioControlled_JN&hash=item20d0dc54a4

[Edited on 29-03-2013 by Steve]


They look like home made shit.
Steve
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29th Mar 13 at 20:41   View Garage View User's Profile U2U Member Reply With Quote
interesting, do you think he could do a set for the 5.8 fpv stuff?

also if i stuck a 2.4ghz skew planar on the radio, would that help even though the spektrum RX on the drone wouldnt be using a skew planar? just the boggo antenna wires
DaveyLC
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29th Mar 13 at 20:42   View User's Profile U2U Member Reply With Quote
His 5.8 stuff will be marginally better than the fatshark stuff.. They do actually test stuff on a network analyser but markus is SUPER ANAL so his will be a touch better.

When it comes to microwave frequencies its a dark art building good antennas.

You need a C/P both ends.. So either make sure your TX is vertically polarized and one of your antennas on the quad is also vertical and you'll be fine having both of them in just any old position will equal shit results.

[Edited on 29-03-2013 by DaveyLC]
John
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29th Mar 13 at 20:44   View User's Profile U2U Member Reply With Quote
I don't know anything about drones but I do know that although there is a lot of maths behind designing perfect antenna (antennas antennae?), a lot can also be done with bending bits of wire, doesn't need lots of money and equipment to make it perform well.
DaveyLC
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29th Mar 13 at 20:49   View User's Profile U2U Member Reply With Quote
Steve I make sure my spectrum stuff is V and H polarized and I always have the antenna vertical on the TX.



quote:
Originally posted by John
I don't know anything about drones but I do know that although there is a lot of maths behind designing perfect antenna (antennas antennae?), a lot can also be done with bending bits of wire, doesn't need lots of money and equipment to make it perform well.


A microwave network analyser costs TENS of thousands.. Down in HF/VHF/UHF above is true but when you're up in the GHZ ranges you can't get it exact with a pair of cutters because even a fraction of solder can fuck it all up.

[Edited on 29-03-2013 by DaveyLC]
Steve
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29th Mar 13 at 21:21   View Garage View User's Profile U2U Member Reply With Quote
Driving me mad trying to find anywhere that sells a u.fl to male sma cable

this is the sma end i need



and ufl the other, can only get them from usa or china sellers, driving me mad
neoquip
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30th Mar 13 at 15:51   View User's Profile U2U Member Reply With Quote
if you can get them off Ebay.. buy it.

maplin's don't do them then or RS components
http://uk.rs-online.com/web/?cm_mmc=UK-PPC-0212-_-00_Brand-_-RS_Brand_Exact-_-rs_components&gclid=CKvt6s3lpLYCFUbKtAodd1UAcg

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