[CQ] SatNOGS meeting notes 2017/07/09

[James Addison]

Ah yep -- we ended up skipping last Monday due to scheduling issues, but we
should be meeting again at NB on Tuesday evening (Jul 25th).

I'll update the wiki until we get a confirmed schedule

On 22 July 2017 at 10:56, Jeff Luszcz <jeff at luszcz.com> wrote:

> 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/dashbo
> ard?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
> [1] - https://community.libre.space/t/interference-from-stepper-motors/81
> [2] - https://community.libre.space/t/rf-shileding-and-interferenc
> e-from-steppers/235
> [2] - https://satnogs.dozuki.com/Guide/SatNOGS+Rotator+v3+Mechanic
> al+Assembly/7
>
>
> PS: Nice video timelapse of rotator construction here -
> https://www.youtube.com/watch?v=D6P9HK23Gmo&t=396s
>
> On 9 July 2017 at 17:03, Patrick O'Doherty <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
>> [1] - https://noisebridge.net/wiki/SatNOGS
>>
>>
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>> CQ at lists.noisebridge.net
>> https://www.noisebridge.net/mailman/listinfo/cq
>>
>>
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