[psas-avionics] Woops Re: Upcoming Amateur Radio tests and review workshop.

[Doug Ausmus]

Yeah, I know I responded to an old email ... sorry... That's what happens
when I work late and answer emails first thing in the morning.
Still, the note is good info for those wanting to get their hgam license
this year.
:-)
Doug

On Tue, May 1, 2018, 06:57 Doug Ausmus <daus...@gmail.com> wrote:

> Also please note that the current ARRL Technician License study book
> expires at the end of June this year, then the question pool changes. If
> you are planning to take your tecnician exam before June 30, all is well.
> Otherwise make sure you study the new question pool. All classes of license
> tests rotate their question pools on a rotating schedule.
> http://www.arrl.org/question-pools
>
> Just FYI,
> Doug
>
> On Fri, Sep 1, 2017, 16:46 Glenn LeBrasseur <glenn.lebrass...@gmail.com>
> wrote:
>
>> Hello,
>>
>> For people who are interested in getting their Amateur Radio license, or
>> upgrading their existing to a higher class, there are several tests
>> available in the Portland metro area in the next month or so. The process
>> to get a license for those new to amateur radio is:
>>
>> (1) Study the ARRL license manual. (Ask around to find a copy; Google may
>> be your friend here.) There are other resources for this information, the
>> license manual is just a convenient resource in one place.
>>
>> <http://www.arrl.org/ham-radio-license-manual>
>>
>>
>> (2) Test yourself with samples of the exam questions that are freely
>> online.
>>
>> <
>> https://www.arrl.org/files/file/Get%20Licensed/HRLM%202nd/QPOOL-study%20guide-2nd-ed.pdf
>> >
>>
>>
>> (3) Possibly partake in the review workshop
>>
>> In the past it was shown to be helpful to have a question & answer /
>> study / review workshop just before the test. Myself and possibly two other
>> licensed amateurs are willing to hold this workshop in the PSAS Lab EB-91
>> on the two following dates:
>>
>> *  Tuesday 12-Sep-2017 at 6 to 7pm
>> *  Friday 15-Sep-2017 at 1 to 2pm
>>
>>
>> (4) Take the test
>>
>> Information on the tests can be found at:
>>
>> <http://www.arrl.org/find-an-amateur-radio-license-exam-session>
>>
>> There are usually four tests held somewhere in the metro area each month.
>> Here are the test dates for September and October.
>>
>> 09/02/2017 | Portland OR 97229-5460
>> 09/03/2017 | Milwaukie OR 97222
>> 09/16/2017 | Lafayette OR 97127-
>> 09/17/2017 | Scappoose OR 97056-3721
>>
>> 10/01/2017 | Milwaukie OR 97222
>> 10/07/2017 | Portland OR 97229-5460
>> 10/14/2017 | Vancouver WA 98686-1442
>> 10/15/2017 | Scappoose OR 97056-3721
>>
>>
>>
>> (5) Wait for your new license call sign to be emailed to you by the ARRL.
>>
>>
>>
>> Please email me if there are any questions.
>>
>> Enjoy,
>> Glenn, KJ7SU
>>
>> --
>> Glenn Noel LeBrasseur
>> glenn.lebrass...@gmail.com
>>
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>>
>
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Re: [psas-avionics] Upcoming Amateur Radio tests and review workshop.

[Doug Ausmus]

Also please note that the current ARRL Technician License study book
expires at the end of June this year, then the question pool changes. If
you are planning to take your tecnician exam before June 30, all is well.
Otherwise make sure you study the new question pool. All classes of license
tests rotate their question pools on a rotating schedule.
http://www.arrl.org/question-pools

Just FYI,
Doug

On Fri, Sep 1, 2017, 16:46 Glenn LeBrasseur 
wrote:

> Hello,
>
> For people who are interested in getting their Amateur Radio license, or
> upgrading their existing to a higher class, there are several tests
> available in the Portland metro area in the next month or so. The process
> to get a license for those new to amateur radio is:
>
> (1) Study the ARRL license manual. (Ask around to find a copy; Google may
> be your friend here.) There are other resources for this information, the
> license manual is just a convenient resource in one place.
>
> 
>
>
> (2) Test yourself with samples of the exam questions that are freely
> online.
>
> <
> https://www.arrl.org/files/file/Get%20Licensed/HRLM%202nd/QPOOL-study%20guide-2nd-ed.pdf
> >
>
>
> (3) Possibly partake in the review workshop
>
> In the past it was shown to be helpful to have a question & answer / study
> / review workshop just before the test. Myself and possibly two other
> licensed amateurs are willing to hold this workshop in the PSAS Lab EB-91
> on the two following dates:
>
> *  Tuesday 12-Sep-2017 at 6 to 7pm
> *  Friday 15-Sep-2017 at 1 to 2pm
>
>
> (4) Take the test
>
> Information on the tests can be found at:
>
> 
>
> There are usually four tests held somewhere in the metro area each month.
> Here are the test dates for September and October.
>
> 09/02/2017 | Portland OR 97229-5460
> 09/03/2017 | Milwaukie OR 97222
> 09/16/2017 | Lafayette OR 97127-
> 09/17/2017 | Scappoose OR 97056-3721
>
> 10/01/2017 | Milwaukie OR 97222
> 10/07/2017 | Portland OR 97229-5460
> 10/14/2017 | Vancouver WA 98686-1442
> 10/15/2017 | Scappoose OR 97056-3721
>
>
>
> (5) Wait for your new license call sign to be emailed to you by the ARRL.
>
>
>
> Please email me if there are any questions.
>
> Enjoy,
> Glenn, KJ7SU
>
> --
> Glenn Noel LeBrasseur
> glenn.lebrass...@gmail.com
>
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Re: [psas-avionics] Strong opinion on 0603 vs 0402 for LGR, and future boards?

[Doug Ausmus]

I didn't see anyone bring this up, and I'm not sure which dielectrics and
types are being used, and at risk of stating what is likely trivially
obvious to the electronics designers in this august group , but when
using MLCC and going to smaller size capacitors (X5R and X7R, others) don't
forget to re-check the dielectric voltage-dependence curves. For your chip
film caps, this is far less an issue.

Here is some info and references, just in case some of your non-electronics
designers want to check it out:

Although this article is testing with higher valued caps, here's a nice
graph showing how the smaller chip sizes increase this effect over larger
sizes:
http://www.edn.com/design/analog/4402049/2/Temperature-and-voltage-variation-of-ceramic-capacitors--or-why-your-4-7--F-capacitor-becomes-a-0-33--F-capacitor
(Figure 1 and Table 2)
(From the following original article:)
https://www.maximintegrated.com/en/app-notes/index.mvp/id/5527

Most everyone is aware of the DC bias dielectric effects, but note that AC
waveforms have some dielectric effects as well, but exert their effects in
the opposite direction, to a point and are, of course, frequency dependent
(I am not sure if these AC dielectric effects are also size-dependent or
not, but it would be logical they might be):
http://catalogs.avx.com/SurfaceMount.pdf
(PDF page 128, [doc page #127]... Figures 2, 3)

:-)
Doug



On Sun, Oct 9, 2016 at 11:18 PM, Andrew Greenberg  wrote:

> > Are there any places where we need to be concerned about wattage?
>
> Yep! There are two cases that we won't switch packages: one where
> wattage is a problem (so far, no cases of this on the LGR board) and one
> where the capacitance value is too high for an 0402 (anything greater
> than about 1 uF). In these (and other cases I'm sure I missed) we'll
> leave the larger packages. Other than that, the "jelly bean" parts can
> be switched to 0402.
>
> OK, everyone seems to agree it's a "go", so now OreSat's default package
> size is now 0402. I think this makes sense.
>
> Andrew
>
> --
> ---
> Andrew Greenberg
>
> Electrical and Computer Engineering
> Portland State University
> http://www.ece.pdx.edu/
> a...@ece.pdx.edu  C: 503.708.7711
> ---
>
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Re: [psas-avionics] GPS outage

[Doug Ausmus]

A little background info for those interested:

These are scheduled test events for verifying and validating the WAAS GPS
position-enhancement system for air flight guidance. Here is the report
issued in 2014 for the 2013 year:

http://www.nstb.tc.faa.gov/reports/PAN84_0114.pdf

You can see the test events discussed in Section 8 of the report, although
I was not able to quickly find details on the nature of the testing. I am
sure that data should be findable if interested. I am told by a friend that
these tests are done quarterly, but I don't know the veracity of that
information.

Here is the WAAS testing website:
http://www.nstb.tc.faa.gov/

-Doug


On Mon, Jun 22, 2015 at 1:44 PM, Jenner Hanni jeh.wic...@gmail.com wrote:

 I'm heading to spend the night in Bend on Friday and then was planning to
 road trip randomly all weekend, was considering Eastern Oregon. This is
 ridiculously perfect. I'm totally willing to go along, not sure I'm up for
 driving people though. But count me in, somehow!

  On Jun 22, 2015, at 1:27 PM, Kenny ke...@romhat.net wrote:
 
  The longest window is Saturday from 10a-5p local time.  Can we get a dev
  jGPSv3 running and assemble a Mt. McLoughlin away team by then?  I'm up
  for the drive with a couple passengers.
 
  I wonder if this will impact any of the higher altitude rockets
  acquiring GPS lock while at apogee this weekend at NXRS.
 
  This is why we need a cube-sat with SDR and directional antenna in
  orbit.  Then we could pick up ground based interference from our
  bathrobes.
 
  --
  Kenny
 
 -+---+++-++---+--+-+-++--++--+-+-++--+++-+++-++-+++---++--++
 
 
 
  On Mon, 2015-06-22 at 11:28 -0700, Theo Hill wrote:
  As far as finding a spot to observe in Oregon, Mt. McLoughlin is a
  9,500ft non-technical peak in Southern Oregon that is 1NM from the
  4,000ft AGL boundary. I'd be totally willing to climb with a laptop
  for science.
 
 
  On Mon, Jun 22, 2015 at 10:30 AM, Nathan Bergey
  nathan.ber...@gmail.com wrote:
 Woah, that's fascinating.
 
 We would need to get one of the other GPS boards streaming IQ
 data
 reliably--which we really want to do anyway. It's too far of a
 trip to
 take just for this, I think. Depends on how crazy we're
 feeling.
 
 Might as well record somewhere high up in Portland (Skyline?)
 just in
 case we can see something, though it looks pretty unlikely.
 
 Based on the circles size and the way it cites altitudes I'm
 pretty
 sure the interference will be terrestrial. Then again maybe
 that's
 what they want us to think :)
 
 
 -Nathan
 
 On Mon, Jun 22, 2015 at 10:19 AM, I kirk...@pdx.edu wrote:
  To the GPS folks, there is an interesting event that will
 occur this week
  starting in 15 minutes or so, and going on sporadically this
 week/weekend.
  There is a planned GPS outage over a broad area detailed
 here:
 
 https://www.faasafety.gov/files/notices/2015/Jun/NSAWC_15-01_GPS_Flight_Advisory.pdf
 
  This is centered on a restricted area in Nevada. No idea
 what kind of test
  this will be.
 
  From the map, it won't likely affect any of us in the
 northwest below 40,000
  ft altitude, but it might be interesting to contact anyone
 you know inside
  the map circles and see what they experience. Bonus points
 for anyone that
  can log data in the L1, L2, and/or L5 bands in or out of the
 circles. It
  would be cool to know if the outage is just a CW jammer,
 CDMA jammer, or
  some kind of JEDI satellite tricks.
 
  Enjoy...
 
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  --
  -Theo
 
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Re: [psas-avionics] Update

[Doug Ausmus]

Yeah, I have also noticed those dummy loads don't seem to broadcast very
well... They should fix that. :-)


On Tue, Jul 26, 2011 at 1:22 AM, Andrew Greenberg and...@psas.pdx.eduwrote:

 Not bad progress tonight!

 - All CPAs mounted and connectorized.
 - GPS antenna seems to work (GPS locked using an LNA).
 - ATV seems to broadcast beter through the antenna than a 50 ohm load :)

 More testing, especially VSWR, tomorrow.

 Andrew

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 ---
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Re: [psas-avionics] Help with the flight computer, and a real time Linux patch set

[Doug Ausmus]

Have you calculated the sampling/control intervals yet? If so, what are the
fastest ones or most critical ones that must absolutely be deterministic?

On Thu, Feb 25, 2010 at 9:12 PM, I kirk...@pdx.edu wrote:

 Quoting Josh Triplett j...@joshtriplett.org:


 http://www.osadl.org/?id=99


 Yeah, a huge amount of -rt has made it into mainline Linux.

 The question remains, what do we actually need?


 This is a good question, and IMHO the answer is fairly straight forward.

 -We need the ability to run one or two critical control algorithms at
 regular intervals.

 -We have to be able to guarantee that they will run on-time if they are
 responsible for sampling data.

 -We must guarantee that they will be completed in one control cycle.

 Since the sampling is done by the sensor nodes, and the BPF / LQG / NN /
 whatever estimator will determine the state and decimate the data, we only
 need to 1) be as 'on-time' as the control cycle and 2) keep up with the
 data.

 Our control loop could run like this:
 Get data inputs (speed, position, etc.) from BPF.
 Run control algo (LQR, MPC, PID, whatever)
 Send outputs to the latest values.
 Yield until next control cycle.

 As long as this happens within the control cycle period, we win. If it
 doesn't, the math that makes it work breaks down and we 'could' crash. To
 make this guarantee, industry practice is to build run time metrics that
 measure processor load (instant, min, max, running average) based on idle
 time. As you build the control system, you watch the metrics. I don't let
 systems into 1st production with more than 70% loading. The last one I did
 shipped at less than 20% loading (fairly simple system).

 If the control task runs over (takes more than one cycle to complete) we
 want to log the event so we can make sure we don't see it, and recover
 gracefully if we ever do.

 That's really all that's needed for real time control.

 Thoughts? Challenges?






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Re: [psas-avionics] Flight computers...

[Doug Ausmus]

Actually there were a number of PPC pc/104, pci/104, pc/104+ devices (ca
2003, 2004), although a number of companies have dropped the PPC from their
pc/104 form factor lines. I am sure there are still some being built out
there- try www.mpl.ch , www.embeddedplanet.com , www.menmicro.com ,
www.lavacore.com , www.amcc.com,or www.embeddedarm.com (Technologic
Systems), tro name a few that should still have products. I don't know if
any of these really are appropriate (and I am sure there are more that are
not listed), just saying PPC should still exist on pc/104 and realated
formats.

-Doug

On Sun, Dec 6, 2009 at 4:48 PM, I kirk...@pdx.edu wrote:

 Not bad, but the form factor is a bit funny. They don't even discuss the
 cost. I'll be flying this PC104+ / Atom version unless something better
 comes along when I'm ready to buy:


 http://www.wdlsystems.com/modperl/view_services.cgi?r=detailprod_num=1LA512Caisle_id=1198

 There are industrial temperature types, but they cost 50% more. Still, $490
 for an x86 in onesies is hard to beat. The one Jeremy found uses the Z570,
 this one is the N270. Not sure the difference.

 IMHO, many vendors are making small and powerful computers, but they all
 have their own random form factor. As a result, we can't go buy a COTS
 carrier, case, or expansion module. Instead, we have to run a full design
 cycle just to make the thing fit in the rocket. I'd like to see a PC104+
 version of the PPC (if that's what we use). That would at least make
 mounting and peripherals more manageable.

 In general, it probably doesn't matter what we launch, as long as we launch
 *something*. I think we could make any of these work, just some may take
 years longer than others.



  Wow, that *IS* a nice module. And yeah, we're kinda stuck with launching
 a PowerPC because of our Linux on POWER grant. But that's OK, what we
 have now will work well for quite a while, and then we can always swap
 out after we successfully launch the PPC.

 Andrew

 Jeremy Booth wrote:

 I figure we have our flight computer needs satisfied for a bit, but I
 was bumbling around on the interwebs and saw this:

 http://www.compulab.co.il/iam/html/iam-cm-datasheet.htm

 Roughly the same physical size as the power PC, but a lot of room to
 expand with features.  Draws about twice the power.

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Re: [psas-avionics] Questions!

[Doug Ausmus]

You might also send the Makefile, if you have one.
-Doug

On Tue, Jun 30, 2009 at 1:17 PM, Dave Camarillo dave.camari...@gmail.comwrote:

 Hi Jeremy, couple questions:

 -I'm assuming you have the ADC code in a separate source file, called
 'adc.c'

 -When doing a 'make', do you see something to the extent of gcc BLA
 BLA BLA adc.c -o adc.o BLA BLA In particular, we want to make sure
 that the corresponding .o file is being created.

 -When doing a 'make', toward the end, during linking (which is where
 your error is coming from), do you see it referencing the adc.o
 object file? If not, that would be the part of the problem.

 Can you send the full console output when running make?


 thanks,
 -dave


 On Mon, Jun 29, 2009 at 4:59 PM, Jeremy Boothjboo...@gmail.com wrote:
  When trying to compile some ADC bits and pieces, I get the following
 error:
 
  main.o: In function `ADCtestTask':
  /home/user/freertos-5.1.2-lpc23xx/BlinkyLightSample/main.c:198: undefined
  reference to `configureADCPort'
  collect2: ld returned 1 exit status
  make: *** [BlinkyLightSample.elf] Error 1
 
  I have a similar directory, include and makefile setup for the GPIO
 stuff,
  and as far as I can tell they all match.  The GPIO commands compile and
 work
  just fine.
  This should show up in the latest commit to the 5.1.2Testing branch of
 the
  LPC2368 code.
 
 
  Also, I could use a few pointers on getting that interworking thing set
 up.
  If I read what Dave said earlier correctly, then I will have to recompile
  the GCC libs, but I could have that all munged up...
 
  -Jeremy
 
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Re: [psas-avionics] Success with the D-Link DWL-160 802.11abg USB device, and an unexpected bonus

[Doug Ausmus]

I have a spare 802.11abg router that can be borrowed if you like.

-Doug Ausmus

On Wed, Jun 24, 2009 at 11:34 AM, Andrew Greenbergand...@psas.pdx.edu wrote:
 Wuhoo! And *whew*. That's great news.

 So what's the easy and quick way to test the 802.11a functionality?
 Should I go ahead and get another couple of these puppies so we can do
 direct tests between them? Or should we try and dig up a 802.11a access
 point somewhere? Anyone out there have an old 802.11a* access point out
 there?

 Andrew

 Josh Triplett wrote:
 We just tested the D-Link DWL-160 802.11abg USB device, and it seems to
 work perfectly with Linux 2.6.30 and the in-kernel ar9170 driver.  We
 successfully connected to an 802.11b network on the PSU campus, and this
 email demonstrates that it can communicate. :)

 As an added surprise, when we went to search for the firmware for this
 card, we discovered that the ar9170 driver
 http://linuxwireless.org/en/users/Drivers/ar9170 has GPLed firmware
 http://linuxwireless.org/en/users/Drivers/ar9170.fw, buildable with an
 SH2 toolchain.  (We haven't tried it yet.)

 We haven't tested 802.11a yet, but we think this one's a winner.

 - Josh Triplett and Jamey Sharp

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