Hi,
I want to take 12V DC through the same RF coaxial cable through which I take RF signal from the modulator O/P to channel combiner. I want to add the DC at the modulator side and take out the DC at the channel combiner side.How can I do it with out affecting the signal?
Hi,
I want to take 12V DC through the same RF coaxial cable through which I take RF signal from the modulator O/P to channel combiner. I want to add the DC at the modulator side and take out the DC at the channel combiner side.How can I do it with out affecting the signal?
Real world experience begs to differ: Millions of GPSs feed 5Vdc up the same coax as the amplifed ~2GHz signal is sent back down the same coax. Same with XM and Sirius receivers. Loran (100Khz) did it. TVRO distribution amplifiers do it. Hams use feedpoint preamps that do it. Etc
It's absolutely simple and commonplace, Sky satellite TV boxes even send DC power one way, and RF BOTH ways - and it's been standard practice for powering masthead amplifiers and cable repeaters ever since they first appeared.
You just need an RF choke and a capacitor at each end, 1mH and 1000pF used to be popular values.
Real world experience begs to differ: Millions of GPSs feed 5Vdc up the same coax as the amplifed ~2GHz signal is sent back down the same coax. Same with XM and Sirius receivers. Loran (100Khz) did it. TVRO distribution amplifiers do it. Hams use feedpoint preamps that do it. Etc