hello there...
i need a circuit that changes an RF ( video and audio) signal generated on Channel 4 ( 67.25 MHZ - VHF Band ) to a Channel 48 signal ( 675.25 MHZ - UHF Band) or any nearby frequency..( 600 to 800 MHZ)...
if anyone could help
What you need used to be commonly available, don't know if they still are or not? - the ones we used to use (for upconverting a VHF relay system to UHF) were called 'T-Verters' or 'Tele-verters'. They were wideband, and converted the entire VHF spectrum to UHF.
The frequencies used and critical layout means it's not really a DIY project.
you are right...they USED to be available...but not anymore.. all what i can find is Audio/Video to VHF modulators...i don t know what do you mean by : DIY project... anyway i need it coz i have an old tv that just receives UHF band... and a video transmitter that transmit over channel 4 (67 mhz) so what i need is something to changes the frequency to the UHF band... any UHF band....or something that Modulates Audio/Video to UHF band...( in the market you can only find VHF modulators)