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Old Oct 01, 2009, 12:57 PM
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pedrocca's Avatar
Pirassununga,SP-Brasil
Joined Sep 2009
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Mini-Review
New equipiment for a new RCG user!

Hi everybody!
I'm from Brazil and I'm here for my first post!
I've just started FPV this week, so I'm here to show you my new equipment, and also ask some questions about it.

I've bought a 480L SONY 1/3'' CCD camera and a 800mW FOX transmitter.
I fly glow powered models, so I've put the camera and the transmitter in to a Hobbico Avistar, powered by a Thunder Tiger .46 glow engine.
The tx video and camera is feeded by a 3S 800mAh Li-Po battery.

In ground I'll use a 20'' TV ( no, I won't carry this huge thing everytime, my rc field has one there, ) and a Laptop to record the flight.

I'm now using a JR F400 72mHz radio, but I've just bought from another RCG member a Futaba 9CAP 72mHz.
My question is, with this video TX and with the Futaba 9CAP, what would be my video range? Maybe a mile?

Another question is about my video receiver antenna.It has a F-type conection, and not a SMA conector. Just by seeing it, do you guys can say what id db gain of it?Maybe 3db?
I had to change this F-type conncetion but I still don't know how.
Leaving the rx in a eletronic shop and resold with a SMA conector or I may find an adaptor..

Here is my first video of it:
http://www.dailymotion.com/video/xam...lhando-pa_tech

Unfortunetaly I had to record direct from the screen of the TV with my digital camera because the driver of my video capture device was missing.But now I had the problem fixed, and it's working just fine.
But the video quality isn't that bad!Please take a watch.

Thanks for the attention,
Pedro
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Old Oct 01, 2009, 01:20 PM
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You probably won't get past a mile with the stock controller.

Video should do a mile but you could get a few miles if you used a patch antenna on the ground.


Don't you get lots of fuel gunk on your camera?
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Old Oct 01, 2009, 01:22 PM
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Rhone Alps, France
Joined Aug 2008
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I get all my connectors and adapters from here: http://cgi.ebay.co.uk/SMA-FME-adapte...4.c0.m14.l1262

They have a very quick delivery and give very good customer service. If you email them with a list of items that you want, they will make a special auction for you and will combine shipping.
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Old Oct 01, 2009, 01:50 PM
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Pirassununga,SP-Brasil
Joined Sep 2009
83 Posts
Hi BushmanLA
Do you have any ideia of getting more tha a mile with the rc tx? I was readind a post here where a man in Romania got a 4 meter fishing rod with a 4 meter insulated wire attached to rc tx and got about 8km range.
Some double the rx lenth.
And no, the oil that the mufler spills get's only under the wing and on the fuselage.

Hello lovegroove!
Is this the adator I should buy? I looks really like the one I need, but it does not say it's a F-TYPE to sma.It says it a sma>fme.



Sorry about my english guys,
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Old Oct 01, 2009, 02:32 PM
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Rhone Alps, France
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No, I just linked to the shop. I think this is what you need.
http://cgi.ebay.co.uk/SMA-female-to-...d=p4634.c0.m14
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Old Oct 01, 2009, 02:38 PM
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Pirassununga,SP-Brasil
Joined Sep 2009
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Quote:
Originally Posted by lovegroove
No, I just linked to the shop. I think this is what you need.
http://cgi.ebay.co.uk/SMA-female-to-...d=p4634.c0.m14
Thanks for the indication!I've found the exact adaptor: http://cgi.ebay.co.uk/SMA-female-to-...d=p3911.c0.m14
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Old Oct 01, 2009, 05:46 PM
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Pirassununga,SP-Brasil
Joined Sep 2009
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I'll buy a 7dbi antenna for the video tx and another 7 dbi antenna for the video receiver.
I must now increase the range of the rc link.
What about 4 meter antenna at the rx? And who knows another 4 meter at the rc tx?
Any suggestion about range?

Thanks,
Pedro
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Old Oct 01, 2009, 05:50 PM
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Quote:
Originally Posted by pedrocca
I'll buy a 7dbi antenna for the video tx and another 7 dbi antenna for the video receiver.
I must now increase the range of the rc link.
What about 4 meter antenna at the rx? And who knows another 4 meter at the rc tx?
Any suggestion about range?

Thanks,
Pedro

You can buy one of the long range control systems for sale here.
Thomas Sherrer's long range system and the Dragonlink system are fairly comparable but the Dragonlink is a newer device that might have a long waiting list.
There is also the DMD 866Mhz control link.

You should be able to easily increase the range of the 72Mhz system by lengthening the receiver antenna and/or making it stick straight up out of the aircraft. I haven't done it myself so check for threads about the subject around here.
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Old Oct 01, 2009, 05:51 PM
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Rhone Alps, France
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I don't think using 7dbi omni antennas for video receiver and transmitter is going to work well unless you intend to fly very low.
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Old Oct 01, 2009, 06:10 PM
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Pirassununga,SP-Brasil
Joined Sep 2009
83 Posts
Quote:
Originally Posted by BushmanLA
You can buy one of the long range control systems for sale here.
Thomas Sherrer's long range system and the Dragonlink system are fairly comparable but the Dragonlink is a newer device that might have a long waiting list.
There is also the DMD 866Mhz control link.

You should be able to easily increase the range of the 72Mhz system by lengthening the receiver antenna and/or making it stick straight up out of the aircraft. I haven't done it myself so check for threads about the subject around here.
I read some threads saying that.I think that should be a good a idea to put another 2,4 meters of wire to the antenna.
Stock 1m antenna going to the rudder + 1 meter going from the rudder to left landing gear + 40cm from left to right landing gear + 1 meter from right landing gear to the rudder.
Any problem about being 3,4m and not 4m(wavelenth size)?

I not need too much reange, for me 1 mile is ok.I just need security.

I read the Thomas Sherrer's thread, I think it's awsome for the long range user, but it's not my case.And for my wallet $$.
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Old Oct 01, 2009, 06:12 PM
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Pirassununga,SP-Brasil
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Quote:
Originally Posted by lovegroove
I don't think using 7dbi omni antennas for video receiver and transmitter is going to work well unless you intend to fly very low.
I'm using a .46 glow engine, it's very powerful. Do you think it would be bad ideia to use the video tx antenna horizontally?
I don't think I would have tooooo much drag when the video tx is about to be horizontally.
Any range estimation?
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Old Oct 01, 2009, 06:33 PM
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Rhone Alps, France
Joined Aug 2008
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If you put the video Tx horizontal then you will only be able to fly very high above you and not go very far. The video tx really needs to be vertical if possible for good range. The reason that 7dbi omni are not very suitable is because if their radiation patterns. It's a very flat donut, which basically means that you have to stay low and can't fly above yourself.

The best antenna for the video tx is a 3dbi omni and then use a higher gain (8dbi+) patch antenna for the video rx and stay within the beam width. I'm going to bed now, but I'm sure someone will explain further if you need them to.
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Old Oct 01, 2009, 07:00 PM
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Pirassununga,SP-Brasil
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Whoa, I didn't know about this low flight using 7 dbi antennas. I thought that the radiation pattern of a 7dbi and a 3dbi would be the same.Good to know that.
I'm intending to buy a 7 dbi omni antenna for my receiver.
I guess my video tx is using a 3dbi, but I'm not sure because in the manual there's no word about the antenna sensivity.

Later I might contruct this patch antenna : http://www.rc-cam.com/gp_patch.htm

Do you guys know the type of wire that is good to be added to the stock rc rx?
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Old Oct 01, 2009, 09:33 PM
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Quote:
Originally Posted by pedrocca
Whoa, I didn't know about this low flight using 7 dbi antennas. I thought that the radiation pattern of a 7dbi and a 3dbi would be the same.Good to know that.

The Dbi rating means, Decibels rating vs an isotropic antenna.

Basically it is a comparison of it's radiation pattern vs a perfectly spherical radiation pattern.

The 7Dbi antenna isn't more sensitive overall, it is just more sensitive in certain directions, and thus less sensitive in other directions. For a whip antenna, imagine a disk radiating from the sides of the antenna. If you are inside the disk, reception is good, outside the disk, it is bad. (This is a VERY simplistic and somewhat inaccurate explination but it should help you visualize the concept)

So for a whip antenna, the worst reception is above and below, the best is on the sides. The bigger the Dbi rating, the flatter the disk. A 0Dbi would actually be a sphere.

Try here for a more detailed explination.
http://en.wikipedia.org/wiki/Radiation_pattern

http://www.antenna-theory.com/basics/radPattern.html
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Old Oct 01, 2009, 10:06 PM
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Pirassununga,SP-Brasil
Joined Sep 2009
83 Posts
I think im getting the point of patterns, but I have to train how to analyze those 2d graphics..
So, do you recomend a 7dbi omni antenna at the video rx and a 3 dbi omni in the video tx?
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