[OFARC] Possible townhouse effect

[sc flowers]

Hey Dom,
Yes, the SWR was 1:1 for this test.  The antenna was designed for 40m but tunes easily on 15m since they may be harmonically related  frequencies.

BTW, the south propagation anomaly may be due to very low WSPR activity in Mexico and Central America.  I looked at WSPR propagation reports from other stations, and there seems to be almost no activity in that geographical area.  So my house may not be the cause for that observation.

I may still be seeing an effect from the adjacent townhome north of mine though.

73,
Stephen (W2WF)

  

> On Nov 25, 2022, at 11:50 AM, Dominic Mazoch <domemt at juno.com> wrote:
> 
> SWR's good?
> 
> 
> Dominic Mazoch
> 
> Please note: message attached
> 
> From: sc flowers <ursae47 at gmail.com>
> To: OFARC <ofarc at mailman.qth.net>
> Subject: [OFARC] Possible townhouse effect
> Date: Fri, 25 Nov 2022 11:17:27 -0600
> 
> 
> Colleagues,
> Good morning.  I noticed something interesting this morning transmitting WSPR at 5 Watts from my IC 7300.  There seems to be directionality in my newly built home brew antenna towards the NNE & NNW compass bearings.  You can see this in the attached WSPR map.
> 
> My antenna is a 40m dipole oriented 30 degrees NNE.
> 
> It is possible that my townhouse is keeping signal propagation from going south.  Possibly due to the TYVEK aluminum foil lined drywall paneling in the walls.  Also the adjacent townhome, with similar construction, 30 degrees north of me may be similarly keeping signals from propagating through it.
> 
> I thought I’d share this interesting result with you.
> 
> 73, 
> Stephen (W2WF)
> <image_123986672.JPG>
> 
> 
> -- 
> Regards,
> Stephen