Hi Brad,
what I can say from my perspective - in the last 10 years I have tried both
grounding and terminating through 75ohm resistor. With the terminating I see
absolutely no pattern distortion on my Beverage's, which was not so obvious
when direct grounding was used.
My Bev's often are crossed 45 deg, height is 1,8-2,0m. I use only isolated
transformers / separate windings.
73's
Mac SP2XF / SN2M
----- Original Message -----
From: "Brad Denison" <brad.denison@gmail.com>
To: <topband@contesting.com>
Sent: Thursday, June 08, 2017 1:54 PM
Subject: Topband: RX antenna switching - unused ports
All,
I am working a homebrew RX antenna switch box for my beverages, flags and
shared apex loop array and am looking for design advice. Can someone
educate me on the proper way to handle unused ports:
1) Leave all unused ports open
2) Ground all unused ports
3) Terminate unused ports to 75 ohm
I have seen various commercially available switch boxes with all of these
configurations but it is not clear to me if any of these variations are
best, i.e does it matter?
Thanks,
Brad, W1NT
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