[Dav_Or]

I have two separate OTA antennas that I just got up. The Channel Master 3671 has a CM 9777 pre-amp, and the Channel Master 4228 has a Wingard 4880 preamp. I used dual quad coax to bring the line(s) in. My plan was to hook them to a Radio Shack remote controlled A/B switch, so I could switch between antennas.

The problem is that I can only get A or B working by itself (one line disconnected), I can't get them both working so I can switch between them. I think there must be some feedback from one side to the other due to the amplification. If I hook up either antenna by itself, the signal is good (for the terrain I live in).

Anyone have any ideas how I can separate the two effectively? I need an electronic check valve.

I was thinking of making a bread box with 4 coax connectors, 2 on each side of the box, and connect each pair with diodes so the flow would only go one way. Anyone think this might work? Would there be a lot of loss breaking the coax line like that?


Dave

 

[Ratman]

Depending on how you exactly have everything connected (amps specifically), you probably just need to either move the amp interfaces or install a "DC Block".

 

[MAX HD]

I've used these for a long time and never had a problem.As long as you have the output from each preamp power supply going to the inputs on the switch,you're good to go.If not,the switch is defective.

 

[Dav_Or]

Quote:

Originally posted by MAX HD I've used these for a long time and never had a problem.As long as you have the output from each preamp power supply going to the inputs on the switch,you're good to go.If not,the switch is defective.

Yes, it's pretty foolproof. "A" in for one lead, and "B" in for the other. The third connection is "tv out".


Maybe as you say, the switch is no good, although it does switch back and forth.


Dave

 

[cpcat]

Assuming you have the A-B switch in line after both power inserters the problem would have to be the switch.


Charles