I use 50 ohm coax for all RX antennas (Beverages, Pennants, etc). I either
use old Heliax or RG8X and use mostly UHF connectors. I guess 75 ohm and F
connectors are popular because of pricing but 50 ohm works perfectly. BTW
I have a lot of deer and they seem to be good at avoiding my temporary
Beverages.
John KK9A
To: Towertalk
Date: Wed, 24 Jan 2018 06:47:17 -0600
I'm working on installing my first 160 receive array.
I don't have room for traditional beverages. Ground mounted receive loops
like the K9AY array will not be a good solution as I have a large deer
population that would end up tearing it down. We had an 8 point buck with
xmas lights hanging off his antlers so I don't think loops would survive
As I go through the design I'm trying to determine if I should use a 75
ohm system (the most common due to cheap rg-6 coax I suppose) or a 50 ohm
system. I have plenty of rg-8x coax laying around and I could use a
remote coax switch to get all of the signals (4) from two reversible
Beverage on Ground (BOG) arrays. I would prefer to bring in a single coax
to the shack vs 4 separate lines.
Will a 50 ohm system play well with the available pre-amps. All of the
pre-amps I have found have F-connectors which leads me to believe they are
setup for 75 ohms. If I go with RG-8x/50ohm matching transformers do I
need to consider a 50 to 75 ohm transformer before going into the pre-amp?
What about the output of the pre-amp into the 50 ohm input of the receiver?
Thanks in advance.
Rich - N5ZC
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