wireless video tranmitters

[Phil Kindred]

Does anyone have any experience or thoughts on using using battery powered video transmitters to send the signal from the camera to the monitor?  I know that  running the wires down the post is more practical, but I have discovered it will take a lot of work to modify my sled.  That's ok with me, but I was just curious about the practicality of it.  More batteries, more weight, etc. 
Well, maybe it won't take that much work.

[Kevin Clark]

I don't see any reason why it can't be done. The only drawback I see is that you have the weight of both a Tx and Rx plus power to deal with. Transmitters can be very small (the smaller the Tx the greater the $$) and receivers on the otherhand tend to be a little chunky. That's not a bad thing necessarily if you have the space and weight to spare.

Hard wiring on the other hand gives you one less thing to worry about failing and two more things you don't have to supply power to. Less is more in this application I think. As far as quality goes, I don't think you'll see a difference on an LCD monitor. That's my nickles worth.

Kevin

[Phil Kindred]

I call that a buck's worth   Just convincing my self to put more work into the sled.  I doubt that the weight, cost, and batteries would be worth it.  Thanks, Kevin--where's my damn drill?

[Ed Liew]

i have tried both. for monitor purpose, wireless ( one of those taiwan made 2.4ghz model ) give me alot of freedom and it only weight a few ounce more. you get good visual but do experience breakup once a while especially in crowded area.

as for cable, i find it difficult to get the rig to balance correctly each time. but on the good side, you get uninterrupted visual.

ed

[Phil Kindred]

Thanks--down the post seems to be the best solution.

[Jon Collins]

Hi Guys,

Thought I would drop in my 4 penith!!!

A cable down the post is by far the best option. I am of the opinion that you should only use wireless links if you really have to. With the 2.4Ghz transmitters that are all over ebay at crazy prices (less than the cost of a cable!!!) you will probably find they don't perform very will at point blank range anyway. A couple of meters distance is the minimum? I have also been using the 2.4Ghz systems to drive a production monitor. As previously mentioned, they work to a degree, but often suffer picture disturbance if large blobs of water called people wall in between the tx and rx. I have used the commercial black box units, as well as experimenting with building my own using the TX and RX modules that are available. I have also tried using better antenna's such as the ones sold for wireless networking (also on 2.4G) These help a great deal over the standard ones. When outside in the street also, I have experienced problems when large vans and lorries pass by.  I know the purpose of the link is just to drive a monitor for the director to watch, but it un-nerves them if they see some glitch?

Jon

[Phil Kindred]

Good points from all--I was just curious if anyone had tried it.  I don't like having my video cable on the outside of the post, so a bit of rework is in order.  Sometimes the best way  is the simplist.  Well, back to the work-bench.

[Jon Collins]

Hi Phil

Check out the rest of the forum. There is some useful info on how to get your cable down the post. Be sure to use a coiled cable to allow your post to extend without problems. Initally I didn't, and just stuffed loads of loose cable down the tube. When I dismantled the post for some reason, I found the cable had been chaffed and trapped in the small gap between the tube diameters. On my current post, I have used a coiled screened cable for the video, fixed top and bottom. I have then coiled around this coiled cable, my power and second video cable so that it all stretches out together?

Try this thread? - http://hbsboard.com/index.php/topic,168.0.html

Let us now how you get on?

Jon

[Brett A. Noe]

Check out the rest of the forum.

Um, Jon? Did you notice how many posts Phil has? 

[Phil Kindred]

For anyone that is interested, try www.Action-Electronics.com.  They have a lot of stuff--batteries, etc and if you  search for project boxes there are some good choices for J-box constuction.   

[Jun Tang]

i( one of those taiwan made 2.4ghz model )

Hey Ed,

Where can you get one of those? Is there a name to it?

[Ed Liew]

hi jun,
not sure of the brand but i can check on monday. if you do a google search with "2.4ghz wireless video", you will find it. anyway, i'm selling it off with my magiqcam. look out for my listing on the clasified next week. will post some pics there.

[Brad Jefferson]

Jun, Ed,

I've been looking for a wireless video transmitter along with a pan & tilt motorized video unit.

The site I found from eventDV magazine was http://www.video-direct.com/accessories/other/wcck.html.  This unit has a 2.4 GHz video transmitter/receiver unit.

Unfortunately, I do not know what brand this is.  I'm not sure if Video-Direct makes it, but after emailing the POC at the website, I did not get any response back.

Has anyone else used this unit before?  If so, I'd like to get your take.

--Brad

[Ed Liew]

ok, i have the opportunity to try out two taiwan made wireless video and audio transmiter and receiver. one is my existing 2.4ghz 1watt set with different power antenna and a 1.2 or 1.4 (i forgot which) ghz set on standard antenna. result is, the first set, definitely very good picture, almost like using cable. the down side, picture break up very easily and the distance is only at about 100 - 150 feet. this is when i'm using a 13db directional antenna on the receiving end.

on the second set, even with standard antenna (6db i think) i can go a very much further distance with very few break up (well, almost to none). the down side, picture quality is not a good as the first set. and instead of visual breaking up, you get black and white picture when signal is weak.

my two cents

ed

[Mauro Zenoniani]

hi,

at last i decided to buy this one and risk.
I 've chosen this one for its small transmitter (i can grip it everywhere around the camera or the sled)

I will test it and i will tell you if i lost my money or not 

http://cgi.ebay.it/TRASMETTITORE-2-4-GHZ-500-MW-4-FREQUENZE-RICEVITORE_W0QQitemZ9735227594QQcategoryZ48632QQtcZphotoQQcmdZViewItem