Hi, I’m looking for 2.4GHz radio capable of sending up to 5 channels of telemetry plus video streaming (preferably two video signals) and 12 channels of digital control signals sent the oposite way.
Maybe something like wireless USB?
Required range up to 3000 meters (if possible) and considerably low power consumption (at least for transceiver mounted in the rc-vehicle.
I thought about GM862 with GPS (which I will need in my system as well), but it would be too expensive to use it.
any ideas?
Many thanks in advance.
wireless USB - no. very short range.
Your only simple and all-digital off the shelf alternative is 802.11, for the video bandwidth needed.
Better:
Use analog 2.4GHz for video (cheap, simple), and 802.15.4 for the telemetry. Put these two at opposite ends of the band else the video will jam out the '15.4. Or use the 900MHz version of '15.4.
stevech:
wireless USB - no. very short range.
Your only simple and all-digital off the shelf alternative is 802.11, for the video bandwidth needed.
Better:
Use analog 2.4GHz for video (cheap, simple), and 802.15.4 for the telemetry. Put these two at opposite ends of the band else the video will jam out the '15.4. Or use the 900MHz version of '15.4.
Thanks for prompt reply.
Which one would have the greatest range?
Cheers.
realspido:
Which one would have the greatest range?
Close to the ground, the propagation loss is greater with higher frequencies. However, as the tranmistter and / or the receiver increases in height above the ground, this effect reduces. Assuming this is for a flying application (eg UAV), the propagation loss should be similar for both frequencies.
That said, receivers for 900MHz tend to be more sensitive than those for 2.4GHz, so you should get better range with 900MHz.
To increase range, you want to do one or more of the following:
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Increase the output power of the transmitter.
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Increase the sensitivity of the receiver.
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Increase the gain of the transmitting and /or the receiving antenna.
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Reduce the propagation loss (use a lower frequency, or move antennas higher off the ground).
Thanks for advice.
Now, is it feasible to install XTEND 900 on the RC heli, or it will drain batteries too quickly and it’s better to stick to XBee Pro 900?
OR, mayb e there are better transceivers that work over the range of 2kms+ ?
realspido:
Now, is it feasible to install XTEND 900 on the RC heli, or it will drain batteries too quickly and it’s better to stick to XBee Pro 900?
OR, mayb e there are better transceivers that work over the range of 2kms+ ?
That would depend on the capacity of the batteries you’re prepared to use, and the flight time you need. There are lots of transceiver modules out there, but not so many choices when you want higher power like the XTEND.
The first step is to determine how the camera will interface to the transmitter.
Simple/cheap is NTSC analog video to an analog transmitter. Nothing digital unless you digitize it on the ground.
The Digi 900MHz is a digital transmitter with a UART input, low speed.