[10gigs] [10GHz-Up] [10ghzcontest] W0AUS beacon report

[George J Molnar]

A lot of the modern “green building” techniques use metallized glass to reflect sunlight and UV. They are extremely effective RF attenuators. Tons of fun trying to demo VHF equipment in a conference room.

Geo/KF2T



> On Dec 28, 2020, at 11:42 AM, W8BYA Gedas EN70JT <w8bya at mchsi.com> wrote:
> 
> Chris, I found your report most interesting and valuable. When you mentioned a very strong signal all but disappearing when looking through a modern glass sliding door that was a bit of a shock ! I suspect the glass has coatings for reflecting uV radiation and this also may be affecting uW signals. Thanks !
> 
> Gedas, W8BYA EN70JT
> 
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> On 12/28/2020 11:12 AM, Chris Cox, N0UK wrote:
>> NLRS Area 10GHz Contest Group.
>> I finally got to perform a quick test yesterday that I’be been intending to do for some time now.
>> 
>> Jon, ‘ZQ, and I had a brief chat yesterday morning whilst it was snowing.  His signal was basically FSD on the FT-817 I/F rig on FM albeit with the typical popcorn noise from the snow scattering.  I was pointing generally in his direction looking out over the balcony with the dish/tripod just inside the apartment.
>> 
>> Closing the treated glass balcony doors, his signal all but disappeared - so probably 60dB or so attenuation when looking through the visibly transparent glass.
>> 
>> That probably accounts for why my copy of the in-test bacon in EN34qt peaked about 10-15 degrees north of the true path since I was then pointing largely through the apartment walls and not through the glazed windows.
>> 
>> I have definitely seen some success in the past when firing through the windows and scattering off of the Downtown Minneapolis buildings, however, that has been at an acute angle to the glass rather than perpendicular.  Perhaps the attenuation is less significant under those circumstances?  Possibly worth further experimentation.
>> 
>> We live in a modern "green” which definitely absorbs and then retains solar heat.  It requires little intentional heating even in winter.  I have no idea what brand or type of glass is used in the building.
>> 
>> Chris Cox, N0UK
>> chrisc at chris.org <mailto:chrisc at chris.org>
>> 
>> 
>> 
>>> On Dec 27, 2020, at 12:30 PM, Jon Platt via 10GHzContest <10ghzcontest at www.chris.org> <mailto:10ghzcontest at www.chris.org> wrote:
>>> 
>>> NLRS Area 10GHz Contest Group.
>>> Hearing the W0AUS/B now.  Started light snowing here about 30 minutes ago.  Direct path, pretty weak, but 50% CW copy.  Good for a Q !  About 53 km over the hills and through the woods.
>>> 
>>> 73, Jon
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