Date   

Re: DRAWS GPS Altitude limit #draws #gps

Brian Badger
 

I don’t know the exact model used but the S1216 GNSS module datasheet says that it will support <18000m OR <515 m/s.  “Either may be exceeded but not both”

Brian N0KZ 


On Dec 17, 2018, at 7:02 PM, Craig Baker, KF7LLA <kf7lla@...> wrote:

Having done a HAB project, we used a Big Red Bee as our primary tracker and were experimenting with the Trackuino (https://github.com/trackuino) that uses the SparkFun GPS-11058 (https://www.sparkfun.com/products/retired/11058).  I'm not sure what the replacement is for the GPS-11058, as that's discontinued, but there should be a newer version that still supports the OR condition.

Craig / KF7LLA


Re: DRAWS RTC

 

The rtc is part of the GPS, it is set by the GPS and it will provide time when trhhe GPS is not receiving. The battery will keep the clock active for a cumalative 40 days when power is removed from DRAWS. 


On Mon, Dec 17, 2018, 17:25 Art - KC7SDA <nouse4anick@... wrote:
So, here is my config for chrony:

pool 2.debian.pool.ntp.org iburst
keyfile /etc/chrony/chrony.keys
driftfile /var/lib/chrony/chrony.drift
logdir /var/log/chrony
maxupdateskew 100.0
makestep 1 3
refclock SHM 0 refid GPS precision 1e-3 offset 0.5 delay 0.2 poll 3 trust require
refclock SHM 2 refid PPS precision 1e-9 poll 3 trust

What should I add to make it use the hardware RTC as a fallback? The only experience I've had with RTC clocks is adafruit's i2c expansion cards.

Thanks
Art


Re: DRAWS GPS Altitude limit #draws #gps

 

Having done a HAB project, we used a Big Red Bee as our primary tracker and were experimenting with the Trackuino (https://github.com/trackuino) that uses the SparkFun GPS-11058 (https://www.sparkfun.com/products/retired/11058).  I'm not sure what the replacement is for the GPS-11058, as that's discontinued, but there should be a newer version that still supports the OR condition.

Craig / KF7LLA


Re: DRAWS GPS Altitude limit #draws #gps

Dave N2OA
 

I’m guessing that you have no idea why I asked. COCOM, which deals with export limits has a regulation stating that a GPS must shutdown if the speed exceeds 1000 knots OR 18km altitude. Many manufacturers implement this as an and rather than an or condition making it useless for high altitude balloons. 

Dave
N2OA 


On Dec 17, 2018, at 7:58 PM, Patrick - KJ4MUB <ptwaugh@...> wrote:

Yes.  Do not go above the GPS satellites. Lol

Patrick Waugh, M.A., #123263
Probation & Parole Officer II
District 21 Field Office - Branson
(417) 239-3274 Direct
(417) 337-8310 Fax


On Dec 17, 2018, at 09:02, Dave N2OA <kdcarlso@...> wrote:

I'm looking into launching a high altitude balloon for one of the local schools and am considering using the DRAWS platform for APRS and data. Is there a altitude limitation on the GPS used?

Thanks,

Dave
N2OA


DRAWS RTC

Art - KC7SDA
 

So, here is my config for chrony:

pool 2.debian.pool.ntp.org iburst
keyfile /etc/chrony/chrony.keys
driftfile /var/lib/chrony/chrony.drift
logdir /var/log/chrony
maxupdateskew 100.0
makestep 1 3
refclock SHM 0 refid GPS precision 1e-3 offset 0.5 delay 0.2 poll 3 trust require
refclock SHM 2 refid PPS precision 1e-9 poll 3 trust

What should I add to make it use the hardware RTC as a fallback? The only experience I've had with RTC clocks is adafruit's i2c expansion cards.

Thanks
Art


Re: DRAWS GPS Altitude limit #draws #gps

Patrick - KJ4MUB <ptwaugh@...>
 

Yes.  Do not go above the GPS satellites. Lol

Patrick Waugh, M.A., #123263
Probation & Parole Officer II
District 21 Field Office - Branson
(417) 239-3274 Direct
(417) 337-8310 Fax


On Dec 17, 2018, at 09:02, Dave N2OA <kdcarlso@...> wrote:

I'm looking into launching a high altitude balloon for one of the local schools and am considering using the DRAWS platform for APRS and data. Is there a altitude limitation on the GPS used?

Thanks,

Dave
N2OA


Re: Compatible case, heat sink, and fans?

Patrick - KJ4MUB <ptwaugh@...>
 

And it would NOT apply to a Pi 3B+, which is what we are talking about.  Further, I have conducted my own measurements, and you should too. 

If you don't care about performance and heat injury to your components, then nope it's not for you.  But, indeed if you do not cool your Pi 3B+, you will not maximize performance and life. 

I prefer to run fully protected even at 100% duty cycle.

Patrick Waugh, M.A., #123263



On Dec 17, 2018, at 14:39, Fred Meier <fsmeier@...> wrote:

Here is a link to a great micro study that substantiates Mr. Sears assertion that a heatsink helps you feel better but probably won’t materially benefit the RPi- http://www.raspberryconnect.com/miscellaneous/item/317-raspberry-pi-cooling-cpu-heatsinks-do-you-need-them

 

From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Robert Sears
Sent: Monday, December 17, 2018 10:35 AM
To: udrc@nw-digital-radio.groups.io
Subject: Re: [udrc] Compatible case, heat sink, and fans?

 

Meh... sure it makes us feel better when the CPU is running at 55c versus 60c, but what is really the benefit? 

I mean sure we can argue reliability and longevity all day long but honestly you are talking about a ten year lifespan versus an eleven year lifespan.

Will you even care about a Raspberry Pi ten years or eleven from now?

The Broadcom BCM2837 itself runs about 20 degrees cooler in CPU intensive benchmarks compared to the Broadcom BCM2836 that the Pi-3 used just due to the integrated heatsink and improved board layout on the Pi-3B+

<image001.jpg><image002.jpg>


Re: Compatible case, heat sink, and fans?

Patrick - KJ4MUB <ptwaugh@...>
 

If you don't mind lower performance in 2 mins flat.  If you use science and data, and MEASURE the CPU temperature you will soon see you in fact need them. 

Patrick Waugh, M.A., #123263
Probation & Parole Officer II
District 21 Field Office - Branson
(417) 239-3274 Direct
(417) 337-8310 Fax


On Dec 17, 2018, at 18:48, Patrick Waugh <ptwaugh@...> wrote:

What humor?

Patrick Waugh, M.A., #123263


On Dec 17, 2018, at 10:53, Robert Sears <kf7vop@...> wrote:

I don't see the need for a fan on a R-Pi,  even a heatsink is not really necessary.

You are limited by the Pi-Hat as far as heat sink height.
 


Re: Compatible case, heat sink, and fans?

Patrick - KJ4MUB <ptwaugh@...>
 

There is definitely a need for BOTH a heat sink and a fan.  The Pi reaches critical temperatures within about 2 mins without.  


On Dec 17, 2018, at 18:48, Patrick Waugh <ptwaugh@...> wrote:

What humor?

Patrick Waugh, M.A., #123263


On Dec 17, 2018, at 10:53, Robert Sears <kf7vop@...> wrote:

I don't see the need for a fan on a R-Pi,  even a heatsink is not really necessary.

You are limited by the Pi-Hat as far as heat sink height.
 


Re: Compatible case, heat sink, and fans?

Patrick - KJ4MUB <ptwaugh@...>
 

What humor?

Patrick Waugh, M.A., #123263


On Dec 17, 2018, at 10:53, Robert Sears <kf7vop@...> wrote:

I don't see the need for a fan on a R-Pi,  even a heatsink is not really necessary.

You are limited by the Pi-Hat as far as heat sink height.
 


Re: Compatible case, heat sink, and fans?

Fred Meier <fsmeier@...>
 

Here is a link to a great micro study that substantiates Mr. Sears assertion that a heatsink helps you feel better but probably won’t materially benefit the RPi- http://www.raspberryconnect.com/miscellaneous/item/317-raspberry-pi-cooling-cpu-heatsinks-do-you-need-them

 

From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Robert Sears
Sent: Monday, December 17, 2018 10:35 AM
To: udrc@nw-digital-radio.groups.io
Subject: Re: [udrc] Compatible case, heat sink, and fans?

 

Meh... sure it makes us feel better when the CPU is running at 55c versus 60c, but what is really the benefit? 

I mean sure we can argue reliability and longevity all day long but honestly you are talking about a ten year lifespan versus an eleven year lifespan.

Will you even care about a Raspberry Pi ten years or eleven from now?

The Broadcom BCM2837 itself runs about 20 degrees cooler in CPU intensive benchmarks compared to the Broadcom BCM2836 that the Pi-3 used just due to the integrated heatsink and improved board layout on the Pi-3B+


Re: Compatible case, heat sink, and fans?

Kenny Richards
 

I think there are valid points raised by people in this thread, so I just want to share some personal experience. I ran a Pi for months as a repeater controller on the bench and eventually in my garage while waiting to move it to a hill top site. Never had a problem with the entire setup once it was dialed in. Then over the summer I started experiencing regular reboots that I couldn't explain. Ultimately I realized out the temp in side the building on the hill was about 15-20 degrees warmer than my shack or garage. Adding an additional fan solved the problem and according to the metrics, it dropped the CPU temp down about 10 degrees. Now that winter is here, the fan isn't running at all and no reboot problems.

I suspect most of us don't need a heat sink or fan for their UDRC/HATS enabled Pi. But there are situations where it might be necessary given environmental circumstances.

73,
Kenny


Re: Compatible case, heat sink, and fans?

Robert Sears
 

Meh... sure it makes us feel better when the CPU is running at 55c versus 60c, but what is really the benefit? 

I mean sure we can argue reliability and longevity all day long but honestly you are talking about a ten year lifespan versus an eleven year lifespan.

Will you even care about a Raspberry Pi ten years or eleven from now?

The Broadcom BCM2837 itself runs about 20 degrees cooler in CPU intensive benchmarks compared to the Broadcom BCM2836 that the Pi-3 used just due to the integrated heatsink and improved board layout on the Pi-3B+


Re: Compatible case, heat sink, and fans?

Ed Bloom, KD9FRQ
 

I, too, am a fan of cooling.  I have the extend cases with fans for my PiGate and PiGate RMS boxes using the Pi-TNC.
 
I was hoping the DRAWS would come with the riser pins to I could add the 3.5" screen on top instead of routing the thin cable under and around or needing to use the HDMI port.
 
Ed Bloom, KD9FRQ
ewbloom@...
Sent from Webmail access
 
 

-----Original Message-----
From: Fred Meier <fsmeier@...>
To: udrc <udrc@nw-digital-radio.groups.io>
Sent: Mon, Dec 17, 2018 12:09 pm
Subject: Re: [udrc] Compatible case, heat sink, and fans?

IMHO, every microprocessor benefits from improved cooling. The more the processors are enclosed in cases and by add ons, the more important supplemental cooling becomes.
 
From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Robert Sears
Sent: Monday, December 17, 2018 8:53 AM
To: udrc@nw-digital-radio.groups.io
Subject: Re: [udrc] Compatible case, heat sink, and fans?
 
[Edited Message Follows]
I don't see the need for a fan on a R-Pi,  even the need for a heatsink is debatable.

You are limited by the Pi-Hat as far as heat sink height.


Re: Compatible case, heat sink, and fans?

Fred Meier <fsmeier@...>
 

IMHO, every microprocessor benefits from improved cooling. The more the processors are enclosed in cases and by add ons, the more important supplemental cooling becomes.

 

From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Robert Sears
Sent: Monday, December 17, 2018 8:53 AM
To: udrc@nw-digital-radio.groups.io
Subject: Re: [udrc] Compatible case, heat sink, and fans?

 

[Edited Message Follows]

I don't see the need for a fan on a R-Pi,  even the need for a heatsink is debatable.

You are limited by the Pi-Hat as far as heat sink height.


Re: Compatible case, heat sink, and fans?

Robert Sears
 
Edited

I don't see the need for a fan on a R-Pi,  even the need for a heatsink is debatable.

You are limited by the Pi-Hat as far as heat sink height.


Re: Compatible case, heat sink, and fans?

Fred Meier <fsmeier@...>
 

Good morning Patrick.

Good one, ‘Warm regards’. Great question, good humor.

Merry Christmas all.

73, Fred VE7FMN

 

From: udrc@nw-digital-radio.groups.io <udrc@nw-digital-radio.groups.io> On Behalf Of Patrick - KJ4MUB
Sent: Sunday, December 16, 2018 7:09 PM
To: udrc@nw-digital-radio.groups.io
Subject: [udrc] Compatible case, heat sink, and fans?

 

What Raspberry Pi 3B+ case do you use with the DRAWS HAT?

Also, what heat sinks/fan fits?

Warm regards,

 

73’s Patrick


K3BBG - Branson, Missouri
Tri-Lakes ARC Member

 

 

 

 

 


Re: Compatible case, heat sink, and fans?

Gayland Gump
 

Make sure it has room for a fan!

Gayland
KG7GCF


On Sun, Dec 16, 2018 at 10:29 PM John D Hays - K7VE <john@...> wrote:
A custom case is under development, it will be available after the new year.

On Sun, Dec 16, 2018 at 10:25 PM Patrick - KJ4MUB <ptwaugh@...> wrote:
What Raspberry Pi 3B+ case do you use with the DRAWS HAT?

Also, what heat sinks/fan fits?

Warm regards,

73’s Patrick

K3BBG - Branson, Missouri
Tri-Lakes ARC Member








--


John D. Hays
Edmonds, WA
K7VE

   


DRAWS GPS Altitude limit #draws #gps

Dave N2OA
 

I'm looking into launching a high altitude balloon for one of the local schools and am considering using the DRAWS platform for APRS and data. Is there a altitude limitation on the GPS used?

Thanks,

Dave
N2OA


 

Basil recommends 

Look at these 3 scripts in ~/bin for controlling direwolf & ax.25
ax25-start
ax25-stop
ax25-status 

Rather than starting direwolf from the command line.
Though if you were to use the command line, you should use the full path name

direwolf -c /etc/direwolf.conf


 

On Sun, Dec 16, 2018 at 10:26 PM <jgindc1@...> wrote:
Running beta5.

I have used ./app_config.sh core

In /etc/direwolf.conf, for Channel 0 PTT is set by
   PTT gpio 12

However, when invoking direwolf as in
  direwolf -c /etc
direwolf responds with
"Note: PTT not configured for channel 0. (Ignore....)"

  With the radio tuned to 144.390 digital, APRS packets are received and successfully decoded.

With n7nix/debug
  sudo ./btest.sh -p
  response says a beacon has been sent, but the radio PTT is not triggered.

I am wondering if the problem is that the DRAWS connection between gpio 12 need to be routed to the correct pin on the right DIN-6 connector, pin 5 for 1200 baud. I believe there are configurable switches on DRAWS.

Suggestions much appreciated

I must say I am enjoying working through the various configuration details as an early adopter.

gpsd is working and I have successfully installed PAT on an earlier Compass version (Sending and receiving Winlink messages via Telnet).

73, John KM7LJ


On Sun, Dec 16, 2018 at 4:28 PM Basil Gunn <basil@...> wrote:

The way the image is intended to be used is to follow these instructions:

https://github.com/nwdigitalradio/n7nix/blob/master/DRAWS_CONFIG.md

From those instructions when you run:
./app_config.sh core
it will setup direwolf/ax.25/systemd so that it all starts at boot time.
It also makes you change your password, sets your time zone, and changes
your hostname.

You should NOT try to start direwolf from the console or the menu system
because it is already running. If you run
pidof direwolf
you will see that direwolf has a process id which means it is running.

Then use the following instructions to verify things are working properly.
https://github.com/nwdigitalradio/n7nix/blob/master/VERIFY_CONFIG.md

direwolf is started via systemd. The correct way to stop direwolf &
ax.25 is to use: ax25-stop in your local bin directory.

Look at these 3 scripts in ~/bin for controlling direwolf & ax.25
ax25-start
ax25-stop
ax25-status

Do NOT use systemctl to start & stop direwolf
Do use ax25-start & ax25-stop

Please read these pages:

https://github.com/nwdigitalradio/n7nix/blob/master/DRAWS_CONFIG.md
https://github.com/nwdigitalradio/n7nix/blob/master/VERIFY_CONFIG.md

/Basil

John D Hays - K7VE <john@...> writes:

> On Sun, Dec 16, 2018 at 12:49 PM David [kg5eiu] via Groups.Io <dcappello=
> aol.com@groups.io> wrote:
>
>> Okay - I am going to try my 991 in packet mode - BTW with the Beta 5 image
>> I try and run dire wolf and I get a permission problem:
>>
>>
>>
> As I noted, in another post.  The menu item does not work (it is setup by
> the direwolf install)  ... Basil has systemd scripts to start and stop
> direwolf
>
> See if it is running:
> sudo systemctl status direwolf
>
> Then
> sudo systemctl start direwolf
> or
> sudo systemctl stop direwolf
>
> And you can tail -f the log to see what is happening.
>
> The configuration file is in /etc





--


John D. Hays
Edmonds, WA
K7VE