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2.4ghz vs 5.8ghz Wireless


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#1 Andrew Fraser

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Posted 28 December 2007 - 07:56 AM

What would be best for use both indoors and outdoors with the transmitter mounted on a remote control camera dolly and the receiver mounted on the end of the track (or both ends with a diversity system)

Rough specifications of the two system that I am looking at...

2.4ghz (Teletest)
SDI
Diversity receiver
Short antenna on transmitter (most likely) and Long antennas on receiver (directional)

5.8ghz (Prairietech.us)
BNC
Single antenna receiver
Larger antenna on transmitter (9in) and not sure on receiver

Or are there any other systems that can be recommended?
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#2 Robert Starling SOC

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Posted 28 December 2007 - 11:41 AM

What would be best for use both indoors and outdoors with the transmitter mounted on a remote control camera dolly and the receiver mounted on the end of the track (or both ends with a diversity system)


Hi Andrew, here is a link to a thread that will answer most of your questions and give you a basic idea of how RF works. I don't know the two units you have listed but given their frequency range or any frequency range, I'd take the lower freq possible " IF " all other elements of the signal transmit / receive path were the exact same and exact quality. Freqs in the microwave range (ghz) are easily absorbed / blocked so line of sight is key to the signal path. A quality transmitter / receiver system in the range of VHF and UHF freqs say 140 - 900 MHZ will win hands down over microwave; thus the popularity of CanaTrans / Modulus and other VHF/UHF transmitters here.

http://www.steadicam...amp;#entry21630

Good luck!
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#3 Jon Beattie

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Posted 28 December 2007 - 04:34 PM

2.4 and 5.8 can both carry very good video quality. Thay can have good range. they don't usually have a frame delay.

The issue with both is they are extremely directional. And they both are not very good at going through walls of anykind.

Though the picture quality isn't always as crisp for the best results in range line of sight and with objects in the way and while moving around. the best is UHF and VHF.

14yrs as a HAM (KF2MY) I can say that UHF/VHF are far better match for Steadicam.
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#4 Andrew Fraser

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Posted 29 December 2007 - 06:29 AM

BTW If it helps I am in Australia, and I am not to sure what is legal/illegal or the standard for wireless tx/rx. I would like it to be a pretty universal system so that (preferably) HD cameras can be plugged in but most the time just connected to my XL1. In this case is SDI the best option over BNC? It would also most of the time be running into a vision mixer, but on occasions just recording onto the camera so minimal delay is extremely important.

The line of sight shouldnt be too much of a problem as if it were to be the 2.4ghz system running a diversity receiver there could simply be an antenna at each end of the track, switch between the best signal or whatever is closest to the buggy with the transmitter.
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#5 Robert Starling SOC

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Posted 29 December 2007 - 12:10 PM

I would like it to be a pretty universal system so that (preferably) HD cameras can be plugged in but most the time just connected to my XL1. In this case is SDI the best option over BNC?


I currently do not know of any "operator affordable" HD transmitter systems. You'll need a downconverter to provide a SD signal if your camera does not provide a standard def output. Try searching the Forum regarding this topic; there are are hundreds of postings discussing this topic (and just about every other topic) from every angle, budget, application and geographic location.
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#6 Andrew Fraser

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Posted 31 December 2007 - 11:35 PM

Looking at the Teletest catalog, it says that it is "High Definition Compatible", what would that be implying. It works fully with HD, down converts it to SD or what would it do?
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#7 David George Ellis

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Posted 29 February 2008 - 09:39 AM

Not sure if our TV guys can comment on this, but I found it online and was wondering if any of y'all have had a chance to work with it, or at least tell if it is something feasible for us to work with:

http://www.rfcentral.com/rfxcmt.html

Didn't see anything on price, but it looks pretty cool.

Attached Files


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#8 Mike McGowan SOC

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Posted 29 February 2008 - 10:11 PM

wow, how much does one of those go for???? what kind of reciever do you need?
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#9 Wolf Seeberg

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Posted 03 March 2008 - 02:59 AM

write to me for FAQ
we know Tx for film... short range ... long range... USA compatible..overseas you have a lot more choices.. Tx start at $ 750 for "good" stuff... canadian stuff $ 4000... modulus has canceled the 4000 for now... its not easy...
we have many tuners, some diversity
check our website
www.wolfvid.com
but most of all write to me and I will send you a fat FAQ.
wolf@wolfvid.com
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