[TowerTalk] Beverage on Ground: 50 ohm or 75 ohm system?

[Kim Elmore]

I have K9AY loops and LOTS of deer. I tie small clot strips on the bottom wire. No problems. 

Kim N5OP

"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith

> On Jan 24, 2018, at 07:41, "john at kk9a.com" <john at kk9a.com> wrote:
> 
> 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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