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Need a combiner for 3 aps 13 antenna's. Coudn't find the correct mini circuits unit while surfing the net.. Now talking with mini circuits rep and they need to know what impedance I need . Is it simply a 3 to 1 combiner that maintains 75 ohms? If the transformer on the aps 13 is 300 to 75 ohms could I just remove all of the balun xformers and connect the 3 in parallel for 100ohms or am I way off.. Am I correct that it's 75ohms that is needed at the tuner?
Anyway comments are appreciated..Want to do it all correct the first time... Joel
Also: what is the best frequency range for the combiner.. Is it simply the fm range or should it be much wider?
Follow Ups:
which he might even build (and house in something weatherproof), for you! You'd proabbly get a guarantee, too.But I'd want a 75 ohm coax output, or a 300 ohm output INTO a GOOD additional 75 ohm balun.
This is because good, 'exterior use stable' 300 ohms ribbon is not easy to get, IIRC. It is audibly less lossy. High quality RF work transmitter/downlead ribbon an alternative, isn't cheap either!
I'm thinking passive because I can't see how even a cunning gainless-buffer combiner - the 'active' /powered path would ever be as quiet when listening. BIGGish QUIET / LCLCLC type PSU I'd be betting, and DC blocker caps, minimum and quite expensive - Cf a bespoke traffo thingie.
How many rcvrs/outlets is this array going to drive? how much cable?
OH yes! It may just be that staying with the balanced outputs (ie 300 ohms) of each antenna may help with losses and noise into 'the black box'. Ed will know.
WarmestTimbo in Oz
The Skyptical Mensurer and Audio Scrounger'Still not saluting.'
Read about and view system at:
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Actually forgot about impedance being frequency dependent so combining all three without xformer I guess wouldn't work?
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