OT - Yagi and OCFD vertical separation

[TKNorris]

Can someone direct me to a site or advise me on the minimum vertical
separation between an 80-10M OCFD and a 6 element 10/15/20M Yagi. I've
looked in the 2018 ARRL Handbook but couldn't find what I was looking for.
Thanks, Tom NB5Q
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[Don Wilhelm]

Tom,

I would say 100 feet if you are running 100 watts.  If you increase the
power, the distance should be increased.  As is often said in cases like
this 'it all depends'.

I am assuming you are using the OCFD as a receive antenna.  If you hear
the COR clicking while transmitting, they are too close.

73,
Don W3FPR

On 9/20/2020 5:33 PM, Tom NB5Q wrote:
> Can someone direct me to a site or advise me on the minimum vertical
> separation between an 80-10M OCFD and a 6 element 10/15/20M Yagi. I've
> looked in the 2018 ARRL Handbook but couldn't find what I was looking for.
> Thanks, Tom NB5Q
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[Mike K8CN]

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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[Vic Rosenthal]

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
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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