Hi,
I like to continuous transmit jpeg file from my DIY camera module to my embedded system master like surveillance camera application. 200kps maybe at most 1Mbps is needed.
It is used inside a U.S. house environment so ~ 100 ft indoor. I wonder what radio system i have to use and at what frequency band.
I know 4xx mhz band is only for low duty cycle transmission. how about at 9xxMhz and 2.4Ghz ? many cheap 9xx, 2.4G radio module are only multi-channel FSK. On the very minimum do i have to implement channel scan to find a clear channel before transmit continuously or FHSS is the minimum requirement.
thank you very much
The nRF24L01 can do 2 Mbps data rate (maximum theoretical data throughput is around 1.74 Mbps). You might have to add a high-gain antenna or use an external power amplifier to get the signal to go through walls without losing many packets, though.
chocheng:
Hi,
I like to continuous transmit jpeg file from my DIY camera module to my embedded system master like surveillance camera application. 200kps maybe at most 1Mbps is needed.
It is used inside a U.S. house environment so ~ 100 ft indoor. I wonder what radio system i have to use and at what frequency band.
I know 4xx mhz band is only for low duty cycle transmission. how about at 9xxMhz and 2.4Ghz ? many cheap 9xx, 2.4G radio module are only multi-channel FSK. On the very minimum do i have to implement channel scan to find a clear channel before transmit continuously or FHSS is the minimum requirement.
thank you very much
900MHz you’ll need freq. hopping per FCC.
2.4GHz you need CSMA (listen before transmit) as is 802.11 per FCC.
5.4GHz you need DFS (dynamic freq. selection) to avoid interfering.
5.8GHz (as in 802.11a) essentially same rules as 2.4GHz.
There are lots of analog continuous Tx/Rx devices on the market for video. If you are a licensed Amateur Operator, you can use the ones for 1.2GHz. There are lots of these for 2.4 and 5.8 as well, and they don’t do CMSA but they seem to get FCC Part 15 type accepted anyway.