Topband: RX antenna switching - unused ports

[Maciej Wieczorek]

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 at gmail.com>
To: <topband at 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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