1001copters.com Pinwheel 5.8 Ghz with SWR<1.5 garantee

[1001 Copters]

Good morning,
it's been a long time I didn't update some infos here but I have very good news

Some time ago I have been interested by cloverleaf and pinwheel antenna for video transmission cf:

As the results were not a revolution, I have asked to a specialized company to make some SWR tests on the antenna I baught and I have been very surprised to see that the antenna was centered on 5.3 Ghz instead of 5.8 giving a SWR of 1.8 (see at the end of the message for small explanation on SWR).
Some antennas tested by the company have shown a SWR of 2 to 4 leading to a dangerous operation on transmiters. I have so decided not to sell these antennas because the SWR wasn't garanteed.

Few weeks ago, a french guy, Terrybuild, have build a diy SWRmeter and claimed that now his pinwheel were garanteed with an SWR of less than 1.5. I have mandated again the same company with professionnal equipment to see the reality of this
I have received some antennas ,pick up two and send it to the company (IP FRANCE) the results were... interetsing (at least ) the SWR was between 1.25 and 1.18 (cf the charts here)

So now I can garantee you that the pinwheel 5.8 Ghz have a very good SWR ^^
These antennas are the only one with a garanteed SWR<1.5 (as far as I know )

SWR SMALL EXPLANATIONS: the SWR measure the quality of an antenna (in very short...) the closer you are from 1, the better it is. with an SWR of 1.5 you have 96% of the power that is radiated by the antenna. This mean that if you use a 100mw transmiter, 96mw of the power is transmited.

You can find these antennas here

feel free to contact me for other informations

Best regards,
Cédric

 

[1001 Copters]

Hi,

I have made a test of the Terry Build antenna to compare between a rubber duck antenna 12db and a Terry build pinwheel.
As you will see in the video, The pinwheel enhance the reception in perturbed environment.

A good video tells more than a long speech

 

[ChrisViperM]

You convinced me...just some questions:

On your shop, the Pinwheel 5.8 Ghz RP-SMA is the right-hand circular polarisation and the Pinwheel 5.8 Ghz SMA is left hand circular polarisation...is that correct ?

Why is it called Pinwheel ? AFAIK you take normally a Cloverleaf antenna for the sender and a Skew Planar antenna for the receiver...and the Pinwheel looks like a Cloverleaf.

Chris

 

[1001 Copters]

Hi,

pinwheel and cloverlead are a bit different ( in angle of the lobes)

The SMA and RP-SMA difference is the connector not the polarization.
With this quality of antenna you really don't need to mix cloverleaf/skew planar anymore

To protect my pinwheel I place them inside a ping pong ball or inside a plastic cylinder. I doens't seem to interfer with reception

 

[ChrisViperM]

...I never stop learning. If I am not the only dummy on this planet, here is an exlanation abou the differen connectors: http://en.wikipedia.org/wiki/SMA_connector
So far I only knew of SMA connectors in relation with Cloverleaf and co. But then with your explanation I still don't know the polarisation of the Pinwheel...If I want to use a circular right hand patch antenna on the receiver end I would need a right hand circular polarised Cloverleaf or whatever (RHCP) on the transmitter side...anything else doesn't make sense....and since you get this setup also lefthand circular polarised (LHCP)...I can't imagine that the planar wheel can do both.

 

[1001 Copters]

hi,
is there any circular polarized patch antenna ?
I only knew about patch antenna with vertical/horizontal polarization.
if you mix a circular polarized antenna with a linear polarized antenna, you loose 3db of gain. on a patch antenna it's ok because you generaly have 9 or 12dbs of gain but with a rubber duck antenna with 3db of gain you will loose everything resulting in a crappy reception.

The pinwheel RMK2 are RHCP.

the term "reverse polarity" here refers only to the gender of the connector's contact pin, not in any way to the signal polarity.

 

[ChrisViperM]

Hello

Circular polarized patch antenna:

http://www.firstpersonview.co.uk/antennas/5.8ghz/7dbi-circular-polarised-panel-antenna-for-5.8ghz ...there is also one with 13dbi, but I took the 7dbi. Apart from that someone could also use a Helix, but for what I personally need the 7dbi patch antenne is more than enough. To my knowledge a Cloverleaf in connection with a circular patch antenna and a good antenna tracker is one of the best things you can get at the moment.
But apart from all theory, if you say the Pinwheel is right hand pol. than I'll take a few...one last question: In your previous post you said: "The pinwheel RMK2 are RHCP."...could not find anything RMK2...

Chris

 

[1001 Copters]

Sorry, this is the MK2, not the Rmk2

http://www.helimag.com/articles-review/25405-la-pinwheel-par-terrybuild.html

The best couple for long range FPV should be an helix + pinwheel accorded together yes

By the way, in 5.8 Ghz I strongly recommand NOT to use any convertor (N type to SMA, SMA to Rp-SMA,...) or any cable to have longer cables. Tou will immediatly loose 0.3 point of SWFR. this advice comes from FranceIp. this is the company I have requested to test the pinwheel i'm selling.
before selling the terry build's antenna I have payed a company that works in antenna and frequencies to test it.
the results are in the download section of the antenna:
http://www.1001copters.com/vbulletin/attachment.php?id_attachment=9
http://www.1001copters.com/vbulletin/attachment.php?id_attachment=11
http://www.1001copters.com/vbulletin/attachment.php?id_attachment=10

 

[ChrisViperM]

Thanks...I am happy now.

BTW...I really like your Copter frames :nevreness:

Chris

 

[kloner]

there are all kinds of different rhcp patch antennas. crosshair and helicals are the best, like these. you had shown me some of the guy you get yours from in a post before

http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_45_49&products_id=936
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_45_49&products_id=1026
i made one of these in 5.8 and was my favorite
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_45_48&products_id=807
http://fpvlab.com/forums/showthread.php?3626-Crosshair-10-dbic-Circularly-polarized-antenna-tutorial!

so i'm curious why you'd give anybody money to "test" these things when you could have the machine for $200-$250 and test em yourself?

 

[ChrisViperM]

My problem at the moment is TIME...I am in the process of moving to Brazil and so far I know that import duties will kill me...and I don't know how long it takes to get stuff from EU, US and UK into Brazil. It's a great country but from what I know so far a no-mans-land concernig supply of RC stuff. So...at the moment I get as much finished product as possible into my container...even knowing that I might wind up with some dead duck among my chaos purchases....but I take the risk. Once I am over there, at least I have something to start with and will find the time to play around with the goodies you showed me.
So be warned...if you don't mind I might contact you for advice

Chris

 

[1001 Copters]

so i'm curious why you'd give anybody money to "test" these things when you could have the machine for $200-$250 and test em yourself?

Hi,
the stuff to test 5.8Ghz antenna cost nearly 10k€, not 200
You can build your own system but you don't have ANY insurance on the measure given. That's why I have payed a company.
Terry has build his own SWFR meter but he didn't have any reference to calibrated measure. By doing these measure with professionnal instrument we now have a comparison point.
I'm trying to sell top quality product and controling these antenna in a professionnal way was a way to insure it wa good stuff.
I was wrong.

It's just an awsome stuff ^^

 

[Explorocam]

Help Urgent: 58ANT_PRSMA vs. 58ANT_SMA, vs. SWR Antenna

[h=2]Hi All,[/h]Not sure if this is the place to ask. But here it goes.

I have 5.8Ghz SWR circular polarized antennas on my RX-TX combo (BosCam). I want to buy a new 5.8Ghz TX but the only circular polarized antenna available are either the 58ANT_PRSMA or the 58ANT_SMA.

Will the PRSMA or the SMA circular polarized antennas work with the SWR circular polarized antenna?

​

 

[Explorocam]

I figured it out. The RP-SMA is the same as the SWR.

This is in reference to the connectors.

 

[kloner]

yes, one connector has a male pin inside, other is reverse polarity or doesn't have a pin inside

 

[Explorocam]

yes, one connector has a male pin inside, other is reverse polarity or doesn't have a pin inside

Thanks buddy.