Quantboy
New Member
I have an AC transformer - 24VAC @ 60hz (fed from 120VAC mains) that feeds a common set of power buss rails in a control assembly.
On this 24VAC buss, we need to inject 315mhz RF from a 2400 baud transmitter (FSK/ASK) and the separate this 315 or 433 Mhz signal back off of the power buss further down the assembly in several locations.
What is the best way to:
1) couple the rf signal and inject it on the 60hz power buss? and
2) what is the best way to pull off just the 315 or 433 mhz signal, but not the 60hz?
I've considered using a high pass filter to just get the 300+ mhz freqs, and then a 60hz notch filter (will this pass the 315 mhz still???) in series to take off anything remaining... or a SAW as a bandpass filter -- but after a few attempts -- I'm not sure if I'm actually solving the problem -- or just throwing the RF hot enough where it's going thru the air instead of the power buss and working (intermittently) anyway.
Any suggestions on circuits? What I could google? Recommended ways to get these signals in and out of the 60hz buss?
Thanks in advance,
Ted
The transmitter/receivers are similar to: https://www.sparkfun.com/datasheets/Wireless/General/MO-SAWR.pdf (tx is a simple ASK w a SAW resonator)
TX circuit is https://www.dx.com/p/315mhz-rf-transmitter-receiver-link-kit-green-236262#.VsZJQ-YT92M
I also found IEC 61334, which standardizes a 2400 baud carrier over power lines - but this is more for "smart power meter" communication -- so I'm looking for a better / simplier / cheaper way to do it.
On this 24VAC buss, we need to inject 315mhz RF from a 2400 baud transmitter (FSK/ASK) and the separate this 315 or 433 Mhz signal back off of the power buss further down the assembly in several locations.
What is the best way to:
1) couple the rf signal and inject it on the 60hz power buss? and
2) what is the best way to pull off just the 315 or 433 mhz signal, but not the 60hz?
I've considered using a high pass filter to just get the 300+ mhz freqs, and then a 60hz notch filter (will this pass the 315 mhz still???) in series to take off anything remaining... or a SAW as a bandpass filter -- but after a few attempts -- I'm not sure if I'm actually solving the problem -- or just throwing the RF hot enough where it's going thru the air instead of the power buss and working (intermittently) anyway.
Any suggestions on circuits? What I could google? Recommended ways to get these signals in and out of the 60hz buss?
Thanks in advance,
Ted
The transmitter/receivers are similar to: https://www.sparkfun.com/datasheets/Wireless/General/MO-SAWR.pdf (tx is a simple ASK w a SAW resonator)
TX circuit is https://www.dx.com/p/315mhz-rf-transmitter-receiver-link-kit-green-236262#.VsZJQ-YT92M
I also found IEC 61334, which standardizes a 2400 baud carrier over power lines - but this is more for "smart power meter" communication -- so I'm looking for a better / simplier / cheaper way to do it.
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