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How to transmit video/audio to overflow audtorium
Re-posted at Mark Suszko’s suggestion from the Event Videographer forum.
The Principal of one of the high schools that I produce Grad videos for has asked me to set up a link from the Grad ceremony location (a church) to an overflow auditorium (nearby school gym), so people can watch the ceremony on a video screen.
Distance is in the 150 – 250 metre range.
I run three cameras at the ceremony. (I’m normally a one man band, but enlist help for the few three-camera shoots that I do.)
Issues:
1) Connection – wire or wireless? What are my options for each?
Wire – What do I need in order to push picture and sound down the same cable (Coax? Twisted pair?) Will I need to amplify the signal? How much quality will I lose over 150-250m?
Wireless – Outside broadcast equipment is big $$$$. So could I get away with using equipment like the following? Although they’re designed primarily for surveillance, would they be suitable – or am I merely smoking substances that some would like to acquire? 🙂
Option 1… https://www.microvideo.ca/2400plus.htm
(This unit has features I don’t need)
Here are some specs their rep sent me. Unfortunately, I don’t know which specs indicate the quality.
Transmitter Specifications
Frequency 2400-2483 MHz
RF Output Power per FCC part 15.249
Frequency Stability 0.005% PLL stabilized
Video Bandwidth 5.8MHz
Input Impedance 75 Ohms
Audio Input 1 Vpp line level
Input Impedance 600 Ohms
Bandwidth 50Hz-15kHz (3dB)
Data Connection RJ11 jack for connection to PC with software
Receiver
Image Rejection >60dB
Adj. Ch. Rejection >20dB for adjacent channels, >90dB Ch1-4, >60dB Ch2-4, 3-1
Receiver Sensitivity -90dBm
Coding 32 bit code
Video S/N >40dB at -80dBm RF input signal, >45dB at -75dBm RF input signal
Audio Output 1.5 Vpp line level, typ.
Output Impedance 600 Ohms
Audio Output S/N >12dB at 85dBm RF input
He also sent me estimated range data, but this post is already long…
Option 2… https://www.canvidcam.com/product.php?txtCatID=18&txtProdID=62
This is much more basic, and has a shorter range, but the price is much nicer.
If this kind of equipment is NOT suitable, can anyone point me to stuff that is?2) “Director’s Equipment” – the stuff I need for someone to switch among cameras for transmission to the school gym. I assume I’ll need four monitors (3 source, 1 destination), a video switcher, cabling from cameras to this equipment, and cabling from this equipment to the projection equipment (via the wired or wireless link). Right? Wrong? Did I miss anything?
I suspect what I want to do is possible but not practicable at the kind of low low budgets a grad class of fewer than 250 can afford. But I wanted to run it by people more experienced than me before replying to the principal.
Thanks in advance (and sorry about long post) -
1 Reply
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I will only deal with one aspect of this by saying use wires not wireless especially 2.4Ghz band. It
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