injecting ac signal into dc one for satellite motor

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Hi,
I want to control a satellite dish motor based on DiSEQC1.2 protocol.
I need to merge a dc signal of 18 volt and a 22KHz pulse of about 0.6v pp. I use linear power supply as DC source and PC sound card as signal source. I have tried T-jucnction with and without an inductor series with Dc power supply and capacitance series with pulse. but it does not work, it degrades the shape of signal. would you please give me a solution?

regards
 

You need either a series resistor across which you put your 22KHZ or an injection transformer. the problem is that if you just try to add them with resistors, the resistors in series with the DC supply will reduce the current to the motor too much. Also the 18V supply will look like a short circuit to the AC. You could overcome this by putting a LF chokke in series with the DC supply.
Frank
 

Hi
is there any par tnumber for LF choke?
regards
 

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