would the energy of a nearby SM alter the lobe pattern from the AP antenna

On Tue, Sep 20, 2016 at 12:07 PM, Adam Moffett <dmmoff...@gmail.com> wrote:

> Good to know, thanks.
> In Canopy FSK I remember getting re-regs from people on the side of a
> sector...seemingly regardless of how hot their RSSI was.  In Wimax I
> sometimes see fluctuations of 5-10db in the same circumstance.
> I guess I'm just reaching for explanations.
> ------ Original Message ------
> From: "Chuck McCown" <ch...@wbmfg.com>
> To: "Animal Farm" <af@afmug.com>
> Sent: 9/20/2016 1:00:47 PM
> Subject: Re: [AFMUG] Antenna side lobes...do they move much?
> They would be rock solid if nothing is moving in the nearfield of the
> antenna.  However your particular antenna will have lobes in slightly
> different positions and magnitudes.  The plot you get is the antenna that
> was hand tweaked and tested on the range.  Production models vary a bit
> from antenna to antenna.
> This is kind of like the pattern your headlights cast on your garage
> door.  You will see bands and irregularities on the edges of the light
> pattern.  They really don’t move but are a function of how the light was
> sealed together.
> *From:* Adam Moffett <dmmoff...@gmail.com>
> *Sent:* Tuesday, September 20, 2016 10:57 AM
> *To:* Animal Farm <af@afmug.com>
> *Subject:* [AFMUG] Antenna side lobes...do they move much?
> My question is about the polar plot for a sector antenna where you see
> tiny lobes coming off it.  Such as in between the rear lobe and the main
> lobe there might be several tiny lobes.  I've always thought RSSI was
> unstable when you hit the sector from a weird direction like that.
> If I could see the radiation pattern in realtime would those lobes be
> stationary or would they dance around a little?
> I'm just looking for an underlying reason for things I've seen in the
> field, and maybe a real justification to use when I tell people not to do
> that.

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