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Old Jun 07, 2011, 07:13 AM
Specializing in RC since 1972
Temple, GA, USA
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Originally Posted by Ecibob View Post
I just recently got into FPV and have done a ton of research and reading to figure out what I need. I just wanted to know what you guy's preferences of displays are for a camera such as the DX201.

Is any display over a foot or so in length will not work?
There are two ways to display the video:
- goggles
- laptop with video to USB adapter / old TV / monitor (any size)

I don't know of any reason that there is a size limit on the monitor, other than it needs to be in a dark box.

I use my WinXP laptop with an EasyCap video to USB converter and the software that came with the EasyCap.

If you have got a laptop, then it is the cheapest route, and I believe it is best for a beginner to start with a display, like a laptop. With any display such as a laptop, you will have to build a dark box to use it in sunlight. A 2 - 3 foot cardboard box with the laptop in one end and a hole in the other end to fit your face will keep all the light out.

Cliff
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Old Jun 07, 2011, 12:02 PM
Engineer for Christ
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Amherst, VA
Joined Jun 2006
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Quote:
Originally Posted by Orcoz View Post
Great video! I stumbled on these great RC videos by Flite Test. This video did a fantastic job explaining the different antenna options and the pros/cons with each. They even gave a very nice compliment and thank you to IBCrazy! Much deserved.

I love their video's though... if you've got 10 minutes, it's worth the time.

Oz

http://www.youtube.com/watch?v=I2m169lcBYs
It's kind of funny watching that video. They had the skew-wheel and helicals which should have been the stars of the show. Unfortunately they missed the most important factor of circular polarization: multipath rejection. My guess is they didn't know about it.

They still owe me (and Kevin) a free T-shirt for the helical antenna...

-Alex
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Old Jun 07, 2011, 03:46 PM
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Joined Feb 2011
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Quote:
Originally Posted by IBCrazy View Post
It's kind of funny watching that video. They had the skew-wheel and helicals which should have been the stars of the show. Unfortunately they missed the most important factor of circular polarization: multipath rejection. My guess is they didn't know about it.

They still owe me (and Kevin) a free T-shirt for the helical antenna...

-Alex

Alex - I also wanted to send you out my thanks.... You've made a great contribution to this hobby. Many thanks and keep up the fantastic work
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Old Jun 08, 2011, 01:52 PM
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Portugal, Lisboa, Sintra
Joined Feb 2010
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BEV RC 1,3Ghz 800mw TX/RX question.

Hello!
If any one know this please help me!

I dont know the polarity of the power to the receiver.
I have this cable with 2 wires, one is black the other one is black with withe stripes. which one is + and -.
Normally you have red for+ and black for - .
i am afraid to connect it the wrong way, i think it does not have protection for inverted polarity.
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Old Jun 08, 2011, 02:43 PM
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>the other one is black with white stripes
this is the +
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Old Jun 08, 2011, 05:26 PM
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Canada, BC, North Vancouver
Joined Apr 2011
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Can I use these ferrite cores?

I'm just wondering if these cores found on a lot of cables can be used instead of toroids to reduce interference?

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Old Jun 08, 2011, 05:41 PM
Nakelp
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Dont see why not
I have one on my camera wires, no problems.
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Old Jun 08, 2011, 06:00 PM
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Originally Posted by nakelp86 View Post
Dont see why not
I have one on my camera wires, no problems.

I'm sure they won't cause any problems. Was just wondering if anyone knows if they're as good as toroids or worse.

Also, can you run multiple wires through the same core?
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Old Jun 08, 2011, 06:02 PM
Nakelp
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depending on size I loop servo wire around and through it, but mine has a small opening so I can loop only once, should be enough.
Alex may give his thoughts thou.
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Old Jun 08, 2011, 11:34 PM
Specializing in RC since 1972
Temple, GA, USA
Joined Jun 2009
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Quote:
Originally Posted by Infante View Post
Hello!
If any one know this please help me!

I dont know the polarity of the power to the receiver.
I have this cable with 2 wires, one is black the other one is black with withe stripes. which one is + and -.
Normally you have red for+ and black for - .
i am afraid to connect it the wrong way, i think it does not have protection for inverted polarity.
Use a magnifying glass to look at the writing on the power supply that came with it. There will be a symbol that looks like a capital C with a line coming out of each side. It is a representation of the polarity of the plug.

Also be aware that 99% of these have + on the center pin. I have heard exactly one report of one wired the other way, but I believe that report may have been wrong.

Cliff
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Old Jun 08, 2011, 11:41 PM
Specializing in RC since 1972
Temple, GA, USA
Joined Jun 2009
3,135 Posts
Toroids to stop interference

Toroids will stop RF interference. You generally need to loop it through several times to be effective.

Toroids will not stop the 8khz to 16khz interference from the ESC/motor that can be caused by the very high current draw of wide open throttle while using the same battery for the motor and the FPV.

Perhaps I have been lucky. I have never had any reason to add a toroid.

I would only add one after determining that it actually needed it.

Cliff
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Old Jun 09, 2011, 02:35 AM
QiW
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south east asia
Joined Mar 2009
956 Posts
quick question ...
i am flying with futaba 2.4rc and currently using 900mhz video
i just acquired another video tx rx with the following frequencies ... which one will best suit my futaba 2.4rc without too much damage in the secondary harmonics ??
1 1080MHZ
2 1120MHZ
3 1160MHZ
4 1200MHZ

thanks
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Old Jun 09, 2011, 02:51 AM
QiW
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south east asia
Joined Mar 2009
956 Posts
another quick question
how far apart does the video frequencies have to be in order not to interfere with each other (assuming range between 900mhz to 1.2ghz) ?
planning on flying FPV together ...
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Old Jun 09, 2011, 04:10 AM
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Avoid channel 4 for the harmonics and you will be fine, seperate video channels by 100mhz
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Old Jun 09, 2011, 11:25 AM
QiW
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south east asia
Joined Mar 2009
956 Posts
100mhz good enough ??
ok .... thanks
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