Frequencies: 8 channels from 5.645 to 5.945 GHz
Channels: CH1 5705 CH2 5685 CH3 5665 CH4 5645 CH5 5885 CH6 5905 CH7 5925 CH8 5945
Power: 2000mW (33dB +-1dB) of certified output power
Input Voltage: 7-24V DC, 2-6 cells battery
Cooling System: whole body heat sink and cooling fan
Channel Switching: channel button and channel display
Antenna: RP-SMA female 50 ohm connector
Size: 62mm x 42mm x 20mm
Weight: 37g
Comments
That hobby gets crazier day by day. Crashing >5KG Copters into the crowd seems not enough. Why not implement a 1KW 2,4GHZ microwave oven as Video TX, that will also grill the surrounding.
I wonder if those 2W TX are getting biological relevant for the operator during arming.
Choose the right frequency and build a decent groundstation with diversity (including a tracked high gain antenna) that will give you the most range fun.
Morli, you mention directional Tx antenna, and that's something I've thought about. If would be fairly easy to implement a gimbal to "look at home" on my big helicopter. I have wondered how much improvement I would get if I did that?
I use 5.8GHz, and a patch is fairly large. But a CP Helical is not very big. Could I use that as a directional Tx? I have one, but it's intended to be used as a directional Rx on a tracker.
Adam +1
HAM guys know( requirment for getting the ticket) that power x antenna gain is what real matters. One can pump 2kW into a dummy load and still won't be heard 10 meters away.
However 2 W + decent gain antenna( read directional antenna) can get you 40+ k.m or even more if both sides use direction high gain antenna. So most of the so called FPV Tx/Rx use big numbers to attract attention/sales. Choice is yours.
Sgt,
Don't worry about the coconuts. There are few hundred Tx around you buzzing with 500mW Tx into high quality antennas around you always. Most of the ISP's back haul link between tower to tower here uses 5Ghz for this. I use the same equipments for my clients some times and Tx power is 1000-2000 mW ERIP.
I was digging for info on what you need for HAM license and found that more than 1 Watt, so < 1000mW in the USA you don't need a HAM license - I double checked this with my friends father who has his HAM General level license. So this guy would require you to get one to legally use in the US
Seems like a great transmitter. 2 watts seems like a lot of power but at 5.8 ghz it really doesn't pan out that way in terms of effective transmit range. 2 watts at 900 mhz travels a lot farther than 2 watts at 5.8 ghz. The Friis equation spells this out nicely.
"As the transmitted signal traverses the atmosphere its power level decreases at a rate inversely proportional to the distance traveled and proportional to the wavelength of the signal."
It would be great to have a ham radio license (I do) to use this transmitter, however the frequencies are within the ISM unlicensed band and checking the power limit requirements of transmit power and exact channel frequency assignments before using would be wise. As far as causing interference it is doubtful since the 5.8 ghz band is sparsely populated and the signal just doesn't carry that far. You're far more likely to cause interference to your own on board equipment, Shielding, shielding,shielding!
Keep in mind microwave ovens use 2.4 ghz frequencies to cook food so take precautions when using 5.8 ghz at this power level.
The Hobby King ad doesn't say how much current is drawn for operation but I figure its substantial.
The following links might be helpful.
http://en.wikipedia.org/wiki/Free-space_path_loss
http://en.wikipedia.org/wiki/Friis_transmission_equation
http://www.random-science-tools.com/electronics/friis.htm
http://tesla.unh.edu/courses/ece994/Acrobat%20Files/Friis.pdf
http://www.rfcafe.com/references/electrical/path-loss.htm
http://www.daycounter.com/Calculators/Friis-Calculator.phtml
http://en.wikipedia.org/wiki/ISM_band
geoffrey
Channel 4 on this transmitter, 5645 MHz is out-of-band for radio amateurs in the USA.
I always feel like I am being super negative on RF stuff, but I work at a wireless company and have opinions - okay now that is out of the way... there are two big things to remember here 2000 mW is actually not that much better than 600 W (it seems like it but it is not) and the quality of the TX and RX chain is dramatically more important than PA power (PA is Power Amplifier). So in RF we typically dont use watts, they are clumsy when dealing with big numbers (remember that many radios are sensitive to .0000000001 mW and that is just ridiculous to write so we use db so that we can write things like -90dBm instead. So lets look at transmitters:
200 mW = 23 dBm
600 mW = 27.7 dBm
2000 mW = 33 dBm
To get 2x the range you need to add 6dBm to TX power or 4X the power in mW which is consistent with the inverse square rule (actually RF uses the Friis equation but inverse square is good enough for the math we are doing). So a 2000 mW radio at best gets you less than 2x the range of a 600 mW Tx which gets you less than 2x the range of a 200 mW.
Looking at weight, power consumption and cost, it is more worthwhile to buy a high quality, low power radio with a good antenna than a honkin' tx.
If anybody is wondering I own a 200mW transmitter with nice antennas :)
Good antennas will do so much more than just throwing power at the problem, but would be neat for some super long range stuff (like what 30 km)?
goodluckbuy has a lot of storefronts selling for them, but they are the actual supplier.
Weird setup, but I have always rec'd the stuff, -just takes a while, like any purchase from china.
ps: I bought from good uckbuy but I think these are the same people
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