Hi all,
I've been working remotely with Lisha Sterling with Geeks Without
Bounds, Digital
Smoke Signals <https://www.facebook.com/DigitalSmokeSignals> and other orgs
comprising the Tech Warrior Camp on the ground at Standing Rock. They
completed their WiFi bridge to a nearby tribal-owned telecom on Saturday
and so the camp now has internet, but they could use support building out
an intranet mesh for ready access to Lakota educational materials, medical
and legal info, camp-to-camp communications, and media storage. Nodes will
be powered via a decentralized array of small solar / wind / bike power
modules. The intention is to build out permanent and sustainable
infrastructure at Standing Rock, to last well beyond the pipeline protest.
If you can make it out there to help, or contribute to their fund to
procure necessary equipmen <https://www.gofundme.com/waterissacred>t,
please do! If you're in the Bay and can donate equipment, in particular
OpenWRT-comptatible routers, bring them to Sudo Room ASAP and I will ensure
they make it into one of the trucks heading out there this week.
Read Lisha's post on internet @ Standing Rock: http://gwob.org/internet-at-
standing-rock/
You can find more info on preparing for and being at Standing Rock,
including Lisha's signal #, here:
https://omnicommons.org/wiki/Standing_Rock_Resources
Email me privately for more details on the network buildout phasing,
current technical & environmental challenges, and line-of-site mapping.
Love and solidarity,
Jenny
Help open a people-powered common space in Oakland, California!
https://omnicommons.org/donate
`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
"Technology is the campfire around which we tell our stories."
-Laurie Anderson
"Storytelling reveals meaning without committing the error of defining it."
-Hannah Arendt
"To define is to kill. To suggest is to create."
-Stéphane Mallarmé
~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
Greetings radio geeks,
As you're probably aware, over 10,000 Native Americans and allies have
converged at the Standing Rock reservation in South Dakota on the lands of
the Great Sioux Nation in peaceful defense of the Missouri River, under
which the Dakota Access Pipeline is poised to drill to complete the
pipeline by January 1st.
The main camp, Oceti Sakowin, received an eviction notice from the US Army
Corps of Engineers on Friday, demanding the camp be cleared by December 5th
- one day after a large planned action by Veterans for Standing Rock and a
multi-faith prayer action scheduled for Dec. 4th. In a nutshell, Standing
Rock needs you now more than ever!
I've been helping how I can in communication with Lisha Sterling from Geeks
Without Bounds, who's been working on communications infrastructure on the
ground for the past several months. They recently finished a wifi bridge to
the local tribal telecom, as well as successfully amplifying cellular 3G/4G
reception. *I'm extending a callout for HAM radio operators at her request,
who are willing to stand for the sovereignty of the Great Sioux Nation.*
If you're an experienced HAM radio operator, or know folks who are, and
willing to travel to Standing Rock to help with this critical
infrastructure buildout, please contact Lisha (cc'd) at lisha AT gwob DOT
org.
Resources on Lakota values and culture, medical and legal info, what to
bring, how to get there, and digital security tips can be found at
https://omnicommons.org/wiki/Standing_Rock_Resources - if you fly, Lisha
can help to arrange transport to the camp from the airport in Bismarck.
Mni wiconi (water is life)!
Jenny
Help open a people-powered common space in Oakland, California!
https://omnicommons.org/donate
`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
"Technology is the campfire around which we tell our stories."
-Laurie Anderson
"Storytelling reveals meaning without committing the error of defining it."
-Hannah Arendt
"To define is to kill. To suggest is to create."
-Stéphane Mallarmé
~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
this is for my house. i'm willing to donate money to get it, but i'm ready for it now.
i know we have tons of these spools laying around, and we'll always get more, so tell me where it is.
I was setting up a node with https://sudoroom.org/wiki/Mesh/WalkThrough on
my Mac yesterday, and in addition to the listed binary dependencies, I had
to `brew install gnu-tar`, as the system tar was creating incompatible
packages. Can someone update the wiki page to help out other Mac users?
Andy
I'd like help organize another canvas of the neighborhood around the Omni
to distribute more nodes. Are there still nodes available to distribute?
Anyone interested in helping out? I'm thinking a weekend in early December.
Andy
hey marc, i relocated the two pots racks i said will be helping with.
when doing that, i noticed that the big bubble like antenna was non
secured, it was being held by the network cables that were passing by.
anyhow, i unhooked from those wires and now it is on the floor, against the
shelf unit. i didn't even dare to attempt to bring it up myself. this is a
two folks job. I will return tomorrow, very likely and if you there, we can
bring it back up.
Oh yes, now we have the space to move the four posts racks, something to do
during the day, so we can see clearly; its a bit dark in the evenings.
thanks,
daniel
--
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- - - - - - - - - - - -
Help open a people-powered common space in Oakland, California!
https://omnicommons.org/donate
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - -
Tomorrow, Tuesday, at 7:30 pm we'll be hacking on mesh software and
reorganizing all our stuffs!
No special skills required! Lots of stuff to do!
We need to sort our collection of routers into OpenWRT compatible and
useful and "everything else"!
We need to trace and label all unlabeled ethernet cables going into our
switches!
We might even plan the build-out of a wall/fence to discourage unauthorized
access to the mesh/server area!
I spent many hours yesterday getting the bulk of the reorg done, so most of
the legacy junk and non-mesh stuff has been cleared out or put in boxes.
--
marc/juul
Hi There!
My name is Dustin O'Hara. I'm from Los Angeles. I'm a doctoral candidate
and researcher from UCLA. I'm very interested in the Sudoroom, with a
special interest in the Sudomesh project. I will be visiting the bay area
in early December (5th-9th) to run a weeklong workshop with some high
school students.
I was hoping someone from Sudoroom / the Sudomesh project might be willing
to meet with us and tell us about the space and projects. Additionally, if
someone is interested in running a hands on workshop with us, we have a
budget that we could hire someone or make a donation to the Sudoroom with;
this would be ideal if possible.
All the best, and thanks!
Dustin O'Hara
310.890.8547
no if it's a diplexer, it's called a diplexer on both ends.
"The diplexer is a different device than a passive combiner or splitter."
https://en.wikipedia.org/wiki/Diplexer
if it's a splitter, it's described here
https://en.wikipedia.org/wiki/Power_dividers_and_directional_couplers
the devices are very different. A diplexer divides a port by frequency (above
a certain frequency goes to one port, below goes to the other port) and a
splitter just doubles or halves impedance.
On Thu, 3 Nov 2016, Martin wrote:
> So if it's used on one end it's called a diplexer and a splitter on the
> other but it's the same device under the hood.
>
> Common uses[edit
> <https://en.wikipedia.org/w/index.php?title=Diplexer&action=edit§ion=1>]
>
> A diplexer allows two different devices to share a common communications
> channel. Typically, the channel is a long coaxial cable, and a diplexer is
> often used at both ends of the coaxial cable. The plan is feasible if the
> two devices operate on different frequencies. The plan is economical if the
> diplexers cost less than running a second cable.
>
> Diplexers are typically used with radio receivers or transmitters on
> different, widely separated, frequency bands. A single city radio tower
> might have a police department antenna on 460 MHz and a fire department
> antenna on 156 MHz. A diplexer at the top combines the two antenna signals
> to the single coaxial feedline, and a second identical diplexer inside the
> building separates the feedline signals to the two dispatch radios. Some
> diplexers support as many as four antennas or radios that work on different
> radio bands.
>
> Diplexers are also commonly used where a multi-band antenna is used on a
> tower, with a common feedline. The diplexer will split the two bands inside
> the building (such as VHF and UHF systems combined with a diplexer onto a
> common antenna).
>
> On Thu, Nov 3, 2016 at 5:21 PM, Jake <jake(a)spaz.org> wrote:
>
>> Martin,
>>
>> a diplexer is a device to feed one antenna from two transcievers, since it
>> splits signals according to their frequencies.
>>
>> https://en.wikipedia.org/wiki/Diplexer
>>
>> you might be thinking of a splitter.
>>
>> John, i have a really nice 2.4GHz directional coupler by Narda, it has four
>> ports unlike the slightly similar one in this picture:
>>
>> http://www.recycledgoods.com/media/catalog/product/cache/1/i
>> mage/1000x/af097278c5db4767b0fe9bb92fe21690/n/a/narda-
>> microwave-corp.-3002-30-coaxial-directional-coupler-2.0-ghz-1.27.jpg
>>
>> you can borrrow it if you want, I also have attenuators and stuff like
>> that.
>>
>> -jake
>>
>>
>> On Thu, 3 Nov 2016, Martin wrote:
>>
>> John,
>>>
>>> The coupler you got is probably a diplexer - a device to feed two antennas
>>> with one cable.
>>>
>>> To do the testing that you're thinking of requires a directional coupler
>>> like this: http://www.ebay.com/itm/Mini-Circuits-Coaxial-RF-Direc
>>> tional-Coupler-ZADC-13-2000-1-13dB-SMA-50-Ohm-NEW-/291379146
>>> 740?hash=item43d78ceff4:g:A0IAAOSwqu9U2rgN The seller claims that the
>>> units were tested to 2800 MHz and worked. This is a pretty good deal.
>>>
>>> For the noise source you can use one of these: http://www.ebay.com/itm
>>> /DC-12V-0-3A-SMA-noise-source-Simple-spectrum-external-
>>> tracking-source-DY2-/172150915301?hash=item2814fe80e5:g:OaUAAOSwI3RW-t7N
>>>
>>> You don't need a spectrum analyzer - a Hack-RF or similar SDR will do.
>>> Connect the noise source to the directional coupler input and the antenna
>>> to the coupler output. Attach the SDR to the coupler's coupled port.
>>> With
>>> your favorite SDR software tune your radio to mid-band (2.442 - 2.447
>>> GHz). Note the receiver power level. Reverse the antenna and noise
>>> source, repeat measurement. The larger number is the power delivered to
>>> the antenna, the smaller is power reflected back from the antenna. You
>>> can
>>> use an online calculator like this http://rfcalculator.mobi/
>>> vswr-forward-reverse-power.html to calculate VSWR. The ideal VSWR is one
>>> and an antenna with greater than three should not be used.
>>>
>>> Although the antennas are only rated to 2.2 GHz they may be usable at 2.4
>>> GHz. Check the VSWR.
>>>
>>> The antennas are probably useful for hams (there's a 902.005 MHz through
>>> 927.995 MHz band). I can ask around and see if there's is any interest.
>>> You might want to put one one ebay and see if there's a market.
>>>
>>> --Martin
>>>
>>>
>>> On Thu, Nov 3, 2016 at 1:14 PM, John Fitz <johnfitzeecs(a)gmail.com> wrote:
>>>
>>> Dang, well I picked up the pallet of antennas and it looks like they're
>>>> the CELLMAX-EXT-CPU which only cover 806–960 MHz and 1710–2200 MHz :( .
>>>> Hey but on the plus side, they contain tee couplers that are rated for
>>>> the
>>>> full 698–960 MHz and 1710–2700 MHz. I've needed a 2.4Ghz coupler for a
>>>> while now and that alone was worth the minimum bid for me. With one of
>>>> those, a noise source and a spectrum analyzer, I can start characterizing
>>>> Wifi/Bluetooth antennas.
>>>> The antenna design is relatively simple and pretty cool looking. It would
>>>> be interesting to try and simulate the design and see how much would have
>>>> to change in order to extend the range. Also, if anyone wants to build a
>>>> phase arrayed radar system...
>>>>
>>>>
>>>> On Fri, Oct 28, 2016 at 6:57 PM, Marc Juul <juul(a)labitat.dk> wrote:
>>>>
>>>> Are you sure these cover 2.4 GHz. There are multiple versions of the
>>>>> CELLMAX-EXT and e.g. the CELLMAX-EXT-CPU seems to not cover 2.4 GHz
>>>>> while
>>>>> the CELLMAX-EXT-CPUSE does cover 2.4 GHz:
>>>>>
>>>>> http://www.commscope.com/catalog/wireless/product_details.aspx?id=151
>>>>>
>>>>> https://www.tessco.com/products/displayProductInfo.do?sku=396652
>>>>>
>>>>> if we're sure they cover 2.4 GHz then we'd love to get them! I'd pay up
>>>>> to $100 in that case
>>>>>
>>>>> On Fri, Oct 28, 2016 at 4:55 PM, Jake <jake(a)spaz.org> wrote:
>>>>>
>>>>> pallet of high gain (11dbi) directional wifi antenna's up for auction:
>>>>>> https://www.auctionbdi.com/listings/details/index.cfm?itemnu
>>>>>> m=1158888078
>>>>>>
>>>>>> Fitz says they can probably be won for $25 and i think he's willing to
>>>>>> bid on them for sudomesh
>>>>>>
>>>>>> so if sudomesh wants them, they should tell Fitz how much Sudomesh will
>>>>>> pay for the lot. 140 pounds of antennas.
>>>>>>
>>>>>> Fitz, did you have a datasheet on these antennas? I believe i recall
>>>>>> they were wideband in the 900MHz and 2.4GHz bands?
>>>>>>
>>>>>>
>>>>>> -jake
>>>>>> _______________________________________________
>>>>>> mesh mailing list
>>>>>> mesh(a)lists.sudoroom.org
>>>>>> https://sudoroom.org/lists/listinfo/mesh
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>> _______________________________________________
>>>> mesh mailing list
>>>> mesh(a)lists.sudoroom.org
>>>> https://sudoroom.org/lists/listinfo/mesh
>>>>
>>>>
>>>>
>
pallet of high gain (11dbi) directional wifi antenna's up for auction:
https://www.auctionbdi.com/listings/details/index.cfm?itemnum=1158888078
Fitz says they can probably be won for $25 and i think he's willing to bid
on them for sudomesh
so if sudomesh wants them, they should tell Fitz how much Sudomesh will
pay for the lot. 140 pounds of antennas.
Fitz, did you have a datasheet on these antennas? I believe i recall they
were wideband in the 900MHz and 2.4GHz bands?
-jake
