[CQ] SatNOGS meeting notes 2017/07/09

[Jeff Luszcz]

Thanks for the update, I was at noise bridge last Monday but seemed to miss the group.

I have a junk box of amateur radio equipment / cables / tools that might be helpful.

Jeff

> On Jul 22, 2017, at 10:08 AM, James Addison <jay at jp-hosting.net> wrote:
> 
> Responses to a couple of our TODOs:
> 
> 
> Historic weather/wind
> Weather underground has some really nice historic reports from personal weather stations here:
> 
> https://www.wunderground.com/personal-weather-station/dashboard?ID=KCASANFR79#history/s20160721/e20170722/myear <https://www.wunderground.com/personal-weather-station/dashboard?ID=KCASANFR79#history/s20160721/e20170722/myear>
> 
> tl;dr - wind speed average 5mph, rarely sustained over 15mph.  Gusts typically peak around 25mph, but record gust of 45mph (!).  Mostly from WSW direction (from where Yamo is towards NB)
> 
> 
> Motor types
> SATNOGs seem to be moving towards DC motors[0] -- evidently the previous NEMA17 stepper motors were introducing a lot of noise[1][2]; I'd suggest we follow the trend and opt DC too?
> 
> The build steps are mostly the same, and the differences are called out in the V3 assembly guide[2].
> 
> [0] - https://community.libre.space/t/v3-build-dc-motor-vs-stepper-nema-17/750/2 <https://community.libre.space/t/v3-build-dc-motor-vs-stepper-nema-17/750/2>
> [1] - https://community.libre.space/t/interference-from-stepper-motors/81 <https://community.libre.space/t/interference-from-stepper-motors/81>
> [2] - https://community.libre.space/t/rf-shileding-and-interference-from-steppers/235 <https://community.libre.space/t/rf-shileding-and-interference-from-steppers/235>
> [2] - https://satnogs.dozuki.com/Guide/SatNOGS+Rotator+v3+Mechanical+Assembly/7 <https://satnogs.dozuki.com/Guide/SatNOGS+Rotator+v3+Mechanical+Assembly/7>
> 
> 
> PS: Nice video timelapse of rotator construction here - https://www.youtube.com/watch?v=D6P9HK23Gmo&t=396s <https://www.youtube.com/watch?v=D6P9HK23Gmo&t=396s>
> 
> On 9 July 2017 at 17:03, Patrick O'Doherty <p at trickod.com <mailto:p at trickod.com>> wrote:
> Hey folks,
> 
> A number of folks in the community are gathering together with the aim
> of building a SatNOGS[0] groundstation to be housed at 2169 Mission St.
> 
> Some of us gathered this morning to get things underway, below are the
> summary meeting notes and outstanding TODO items that we walked away with.
> 
> Our next gathering will be Monday July 17th at Noisebridge ~7pm onwards.
> It's our hope that this Monday evening time will suit people for weekly
> meetings. If you're interested in hearing more about the project or
> helping out then please do come along! We're also going to document our
> progress on the wiki[1]
> 
> TODOS:
>  * Investigate reviving Peter's weather station hardware to mount on the
> roof to gather wind information
>  * Look at historical weather data for SF to get windspeed maximums over
> the last while so that we can safely assess mounting an antenna.
>  * Research the motor types most commonly used by other SatNOG builds in
> their rotator assembly.
>  * Check out the power and networking situation on the roof
>    * Document the power supply points on the roof
>    * Estimate the laser's electrical load to understand how much
> capacity we have
>    * Estimate the power requirements for the entire SatNOGS build.
>  * Start a BOM spreadsheet for each component to help gather components.
>  * 3D print the gears required in the rotator assembly.
>  * Laser cut some acrylic sheets to seal the walls of the rotator assembly.
>  * Research how multi-antenna setups might work with SatNOGS
> 
> Hope to see folks at the space next Monday!
> 
> cheers,
> 
> p
> 
> [0] - https://satnogs.org <https://satnogs.org/>
> [1] - https://noisebridge.net/wiki/SatNOGS <https://noisebridge.net/wiki/SatNOGS>
> 
> 
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