[Elecraft] OT - Yagi and OCFD vertical separation

[Victor Rosenthal 4X6GP]

I once hung a 40-meter inverted V a few feet underneath a 4-element 
tribander, and the V absolutely WRECKED the performance of the beam on 
15 meters! It was like no beam at all.

The V was fed with open-wire line, so my solution was to detune it by 
shorting the end of the line when it wasn't in use. I am not sure if 
this would work with coax, and precisely how you detune it depends on 
the length of the line (short, open, or something else).

But I'm just saying -- interactions can be serious.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
.
On 21/09/2020 2:17, Mike K8CN wrote:
> I'll add to Don's guidance this question:
> 
> If you're NOT using the OCFD for receiving concurrently while transmitting
> on the Yagi,  are you concerned about interaction of the two antennas with
> regard to pattern distortion of the Yagi by currents induced in the OCFD?
> 
> If so, then you need a few wavelengths separation at the frequency of
> interest (20 meters being the lowest frequency for the Yagi).  If you don't
> care about the Yagi's pattern distortion, then don't worry about the
> separation distance.  Many folks hang inverted V antennas for the low bands
> from the same tower on which Yagis are mounted, often just a few feet down
> from the Yagi.
> 
> Mike, K8CN
> 
> 
> 
> --
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