I need a circuit to provide a 22 kHz signal coupled to a 13 to 18V DC line. I have a low frequency function generator for the 22 kHz square wave and a power supply for the DC. I've tried just using a cap to couple it on but as soon as I connect the DC my 22 kHz goes to almost nothing.
The DiSEqC standard is for controlling things like an LNB or a switch. In my case I have a Norsat Universal LNB that uses the voltage and signal to select 4 different LOs.
The 22 kHz level is supposed to be just a 0.6V square wave riding on the DC voltage.
I thought it would be fairly simple but it's doesn't seem to be. I'm hoping one of the circuit gurus here can help.
The DiSEqC standard is for controlling things like an LNB or a switch. In my case I have a Norsat Universal LNB that uses the voltage and signal to select 4 different LOs.
The 22 kHz level is supposed to be just a 0.6V square wave riding on the DC voltage.
I thought it would be fairly simple but it's doesn't seem to be. I'm hoping one of the circuit gurus here can help.