Can you use 2.4tx video link with 2.4 radio tx

[mk1spitfire]

1 Will this cause problems and jam my Dx7?

2 is best to use another frequency like 900mhz?

3 Would you 2.4 video for pcm only?

4 can you use 900mhz for uk? I think 2.4 ok

5 Is there any output power resctrictions for uk use?



Thanks


Mk1

[Bigglesworth]

1 Will this cause problems and jam my Dx7?

2 is best to use another frequency like 900mhz?

3 Would you 2.4 video for pcm only?

4 can you use 900mhz for uk? I think 2.4 ok

5 Is there any output power resctrictions for uk use?

Mk1

G'Day

The answer to number 1 is yes it will cause a problem. It won't jam the DX7 but it will reduce it's effective range.
From what I've read, the camera tx effectively increases the noise floor that the DX7 rx sees. This means that the DX7 tx signal level drops below that noise floor at a shorter range. (this is akin to listening to the car radio and then winding down the window while driving, The noise floor has increased so you don't hear the softer notes anymore or you have to get closer to the speaker to hear it again).

Hope that makes sense.

With number 2, it's best to use a frequency that is not a multiple of 2.4 either. (eg 1.2GHz) 900MHz or 5.8GHz is ok. You will get less blind spots with 900MHz (signal fade due to the carbon or metal chopper parts)

Can't help you with 3,4 or 5. Sorry.

I'll link a 5.8GHz video that has a bit of signal fade when I get it on YouTube later tonight.

Cheers

[mk1spitfire]

G'Day

The answer to number 1 is yes it will cause a problem. It won't jam the DX7 but it will reduce it's effective range.
From what I've read, the camera tx effectively increases the noise floor that the DX7 rx sees. This means that the DX7 tx signal level drops below that noise floor at a shorter range. (this is akin to listening to the car radio and then winding down the window while driving, The noise floor has increased so you don't hear the softer notes anymore or you have to get closer to the speaker to hear it again).

Hope that makes sense.

With number 2, it's best to use a frequency that is not a multiple of 2.4 either. (eg 1.2GHz) 900MHz or 5.8GHz is ok. You will get less blind spots with 900MHz (signal fade due to the carbon or metal chopper parts)

Can't help you with 3,4 or 5. Sorry.

I'll link a 5.8GHz video that has a bit of signal fade when I get it on YouTube later tonight.

Cheers


G' day to you down under mate.

Great thanks for your comments, Look forward to your you tube link.

Looks like 5.8ghz is the way to go then?

[Bigglesworth]

Here is the video. Suffered some what from compression, but the cheep lens on the camera has an out of focus area all around the perimeter of the image as well.:mad:

The system is a 5.8GHz Signet camera and receiver kit from Jaycar electronics here in Aus.

I suspect the TX power is only around 1mW because of the very poor out of the box range. (15m if I was lucky):thumbdown:

I have improved the range by making a 1/4 wave dipole TX antennae (pic below) and using a 17dB patch antenna for the RX. (That's the white square between us in the video, good luck picking it out)
From there I record it through the AV in on a mini-DV camcorder.

I have read a bit about the Rangeveiw 5.8GHz TX-RX units with greater output power. I may be getting a set in the future. :thumbup:
Do a search for Rangeveiw in this forum for more info.
I would not recommend the Signet units. :thumbdown:

Re the Pic: The camera has the TX built into the back of it, but they can be separated into two units.
The camera in the video is the one on top of the boom but there is another TX under the boom a bit further back on the boom struts. There is a 5 volt cmos security camera mounted under the nose of the chopper, and the video signal fed into that TX.

The composite video signal to TX is only 40mV p-p not 2V like a video out from a normal camera. If you want to use a normal camera into the TX you will have to drop the peak to peak level.

I prefer the back camera because you get a visual reference in the video rather than free space, but I would like to do a picture in picture video of both when I have a setup to record them both at the same time.


The YouTube link: http://www.youtube.com/watch?v=tPEn3Ddr0Y4

[mk1spitfire]

They always suffer in compression. Interesting camera angle.

Are you using 5.8 because you to use 2.4 as your transmitter?

I'''' have a look at that site. 5.8 is new? You have a very low power system. 1w not alot.!

[mk1spitfire]

I can't find anything on rangeview 5.8 or where to get it?

[Bigglesworth]

They always suffer in compression. Interesting camera angle.

Are you using 5.8 because you to use 2.4 as your transmitter?

I'''' have a look at that site. 5.8 is new? You have a very low power system. 1w not alot.!

Yep I use 5.8 because I have a Spektrum DX7 radio which as you know is 2.4.
You may need to check the rules on 5.8GHz and the max power in the UK.

I don't think its worth trying to boost the power of my Signet unit, I'll just go for a new higher power TX unit

The file was a 1.2gig .avi which I compressed to a 40meg .wmv b4 youtube got it.
I only have a 1500/256 connection here so the 1.2 gig file would have taken days to upload:arggg:.
I'll see what I can do at work tomorrow.

Cheers, Good night

[Bigglesworth]

My mistake :oops:. it was RangeVIDEO

http://www.rangevideo.com (http://www.rangevideo.com/)

[Bigglesworth]

I can't seem to find a 5.8GHz system on there site now. It could have been another site though.

I'd better go to bed b4 I dribble more :BSS, It's like :DH trying to get my brain to work on a Sunday :)

:cheers

[mk1spitfire]

no worries. still cant see 5.8 on range video
1.3ghz
2.4ghz
900mhz

only?

[catfight]

here is quality alternative

http://www.blip.com.au/item.aspx?itemid=38

[mk1spitfire]

Ok so which has its benefits

(eg 1.2GHz) 900MHz or 5.8GHz ????/


5.8 new so prices high?

1.2 ok for 2.4 dx7?

900 mhz ok?