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Techies LooK!!!!

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Old 03-18-2004, 06:01 PM
  #1  
Captain Pugwash
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Default Techies LooK!!!!

Does this look like a good wireless mini cam????

2.4GHz Micro Transmitter w/ Color CMOS Camera.
High Gain 2.4GHz Video receiver.
All necessary video cables and power adapters.
Instruction manual.


SPECIFICATIONS

Camera and transmitter weight: only 9 grams!
Camera and transmitter size: 15mm x 22mm x 32mm (5/8" x 7/8" x 1 1/4")
Camera Lux: <3 @ f1.2
Camera Auto Electronic Exposure of 1/60 to 1/15000 sec. w/ Auto Gain & White Balance
Camera Signal to Noise Ratio: >48dB
365K (PAL) or 250K (NTSC) camera pixel resolution
Wireless Transmission Range: 300M (1000'), Line-Of-Sight
Transmitter RF Output Power: EC R&TTE Compliant
receiver Video Input/Output: 1Vp-p/75 ohm


Answers please all you techie chaps!!!
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Old 03-19-2004, 07:30 AM
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KantoModelAir
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Default RE: Techies LooK!!!!

It being a 2.4 GHZ is a plus. The 1.2 GHZ are actually illegal in the U.S. Also a higher frequency means that the TX needs to output less power, so don't be scared if you see it having less power than the 1.2 GHZ, it still works better even w/ the lower power.
CCD cameras are much better than the cheap CMOS cameras that you see on EBAY. Better quality and doesn't wash out in bright light.
FYI... If it comes w/ one of those small omnidirectional antennas, I suggest building yourself a cheap patch antenna.
Here is a great looking website to help build one.
[link]http://www.rc-cam.com/gp_patch.htm[/link]
Gives an additional 8 db of gain to your RX. FYI, 3 db doubles the power, so 8 db is huge. This will be a directional antenna though, so you would need it to point in the general area of where the camera is. I haven't tried it yet, but I'm starting the project this weekend if the rain keeps me from flying.
Hope the info is useful,
Mark
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Old 03-19-2004, 09:45 AM
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Red_61
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Default RE: Techies LooK!!!!

Just curious WHY the 1.2 GHZ systems are illegal in the USA. Can someone point me to a government article which says it is illegal?

thanks,
Freelancer
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Old 03-19-2004, 03:08 PM
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Default RE: Techies LooK!!!!

There has been a LOT of discussion about the 1.2ghz systems here and I dont have the freq chart handy but it boils down to:
The freq they CLAIM to operate on is also used for aircraft guidance. There is a narrow range in the 1.2ghz band that is Ham legal but NONE of these systems transmit in that range.
The freq they ACTUALLY transmit on usually is about 1.1ghz which is not allowed to be used for this purpose.
Digging around I found this:
896 - 1300 MHz:
896.000 - 901.000 SMR/Business/Industry - mobile (12.5 kHz steps)
901.000 - 902.000 Personal Communications Services
902.000 - 928.000 Amateur (33cm) / various secondary
928.000 - 929.000 ()
929.000 - 930.000 paging
930.000 - 931.000 Personal Communications Services - base
931.000 - 935.000 ()
935.000 - 940.000 SMR/Business/Industry - base (12.5 kHz steps)
940.000 - 941.000 Personal Communications Services - base
941.000 - 960.000 ()
960.000 -1215.000 Aeronautical navigation
1215.000 -1240.000 US Govt - Radiolocation / Space
1240.000 -1300.000 Amateur (23cm)

Full charts can be found at:
[link=http://www.panix.com/clay/scanning/frequencies.html]FCC Frequency Allocation[/link]

[link=http://www.ntia.doc.gov/osmhome/allochrt.html]US frequency allocation chart (pdf)[/link]

All the 1.2ghz systems we have tested transmit right in the Aeronautical Navigation band.
We did not know this when we started out into the world of wireless video!
I, myself, have since moved on to 900mhz and 2.4ghz equipment which, as a licensed Ham, I can use.
These hongkong 1.2ghz systems are very low powered, however, and I seriously doubt you would get in trouble unless you were sitting next to an airport.
Caveat Emptor!
ORIGINAL: Red_61

Just curious WHY the 1.2 GHZ systems are illegal in the USA. Can someone point me to a government article which says it is illegal?

thanks,
Freelancer
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