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gippgig

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Apr 28, 2015, 3:06:36 AM4/28/15

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Interesting article: aviationweek.com/commercial-aviation/can-global-surveillance-be-crowd-sourced

Alex Smith (K4RNT)

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Apr 28, 2015, 8:46:21 AM4/28/15

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Speaking of that, when are the club meetings? I live and work in Loudoun County, VA now, and would like to occasionally make it to the space for a meeting.

" 'With the first link, the chain is forged. The first speech censured, the first thought forbidden, the first freedom denied, chains us all irrevocably.' Those words were uttered by Judge Aaron Satie as wisdom and warning... The first time any man's freedom is trodden on, we’re all damaged." - Jean-Luc Picard, quoting Judge Aaron Satie, Star Trek: TNG episode "The Drumhead"
- Alex Smith

- Dulles, Virginia

On Tue, Apr 28, 2015 at 3:06 AM, gippgig <gip...@gmail.com> wrote:

Interesting article: aviationweek.com/commercial-aviation/can-global-surveillance-be-crowd-sourced

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Martin

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Apr 28, 2015, 12:31:27 PM4/28/15

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I used a ~$20 USB RTL-SDR dongle from my Tenleytown QTH to create this time exposure etch-a-sketch view.

wideareamap.png

Leon S. Ciereszko III

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Apr 28, 2015, 2:03:14 PM4/28/15

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I left for CO and you came back. BTW, I’m headed to Huntsville next week.

Lee N4TCW

Where's Lee?
http://map.findu.com/n4tcw

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gippgig

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May 24, 2015, 10:40:04 PM5/24/15

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www.spacedaily.com/reports/Scientists_print_low_cost_radio_frequency_antenna_with_graphene_ink_999.html
www.spacedaily.com/reports/Tunable_liquid_metal_antennas_999.html

gippgig

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Jun 11, 2015, 7:34:13 PM6/11/15

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www.newscientist.com/article/dn27685-new-urbanist-giving-physical-shape-to-invisible-signals.html

gippgig

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Dec 11, 2015, 11:00:02 PM12/11/15

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www.spacedaily.com/reports/Robot_adds_new_twist_to_NIST_antenna_measurements_and_calibrations_999.html

HacDC Secretary

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Dec 12, 2015, 9:18:36 AM12/12/15

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It does seem weird to use a metal robot to measure EM fields; doesn't
the arm itself create different resonances, etc? I haven't really read
the paper tho.

On 12/11/2015 11:00 PM, gippgig wrote:
> www.spacedaily.com/reports/Robot_adds_new_twist_to_NIST_antenna_measurements_and_calibrations_999.html

Darian Lewis

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Dec 13, 2015, 1:12:07 PM12/13/15

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The test setup is for 100GHz to 300GHz (trying to get to 500GHz). So probably not going to be a problem at 100GHz and up :-) I'd imagine far field begins about 6 cm from the antenna and it's going to be VERY directional. I'd be willing to bet there are no side lobes even for the robot to interfere with.

Darian

Alex Smith (K4RNT)

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Dec 14, 2015, 3:13:16 PM12/14/15

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I was going to ask if there is metallic filament available for 3D printers, but when I read the URL saying they were using graphene ink, it made sense. :)

" 'With the first link, the chain is forged. The first speech censured, the first thought forbidden, the first freedom denied, chains us all irrevocably.' Those words were uttered by Judge Aaron Satie as wisdom and warning... The first time any man's freedom is trodden on, we’re all damaged." - Jean-Luc Picard, quoting Judge Aaron Satie, Star Trek: TNG episode "The Drumhead"
- Alex Smith

- Kent, Washington (metropolitan Seattle area)

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Alex Smith (K4RNT)

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Dec 14, 2015, 3:15:41 PM12/14/15

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I used to live down the hill from a Boeing antenna test facility in the Seattle metro area. They had a hangar, with railroad tracks coming out from it, which they had a parabolic dish antenna (I have no idea what frequency bands they were testing at), and either the receiver or transmitting antenna in the hangar.

9 years living there and I never saw it in use. :(

" 'With the first link, the chain is forged. The first speech censured, the first thought forbidden, the first freedom denied, chains us all irrevocably.' Those words were uttered by Judge Aaron Satie as wisdom and warning... The first time any man's freedom is trodden on, we’re all damaged." - Jean-Luc Picard, quoting Judge Aaron Satie, Star Trek: TNG episode "The Drumhead"
- Alex Smith

- Kent, Washington (metropolitan Seattle area)

Darian Lewis

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Dec 14, 2015, 4:31:27 PM12/14/15

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Which truly is sad. They, just like the govt, throw away and waste so many cool things we could do fun things with.

-Darian

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gippgig

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Feb 27, 2016, 3:48:06 AM2/27/16

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www,spacedaily.com/reports/New_NASA_CubeSat_to_Test_Techniques_for_Eliminating_the_Noise_999.html

gippgig

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Jul 30, 2016, 10:59:18 PM7/30/16

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airandspace.si.edu/stories/editorial/hand-building-radar-systems

gippgig

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Jun 1, 2017, 5:15:13 PM6/1/17

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aviationweek.com/connected-aerospace/anatomy-two-would-be-mesh-network-startups

Bobby Baum

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May 26, 2018, 4:29:59 AM5/26/18

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Want a directv satellite dish? There's one in the dumpster at a
construction site at 7031 Wilson La. (north of Glen Echo, Md. between
MacArthur Blvd. & River Rd.). Appears intact. Get it before the
dumpster is hauled away.

gippgig

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Jan 17, 2020, 2:46:15 AM1/17/20

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If anyone is interested in an antique Stromberg-Carlson cabinet radio one is on sale for $50 at 6409 W. Halbert Drive, Bethesda, Md. 20817 from noon-3:30PM Jan. 19 (ljy...@yahoo.com for details).