Date   

GPSL Session videos available

Michael Hojnowski
 

Gang,

All of the Great Plains Superlaunch session videos for 2022 are available on youtube (easily found by searching "Great Plains Superlaunch").   Thanks to Jim Emmert / WB0URW for taking care of it.  When I get a chance to put the presentation slides up on our website, I'll shoot a note around.

Videos here: https://www.youtube.com/channel/UC6ND5ChsD-bxBigGIyKYnxg/videos

Thanks,
Mike / KD2EAT


All GPSL 2022 Technical Sessions audio files uploaded

Hank Riley
 

The impetus for making these available is that neither hide nor hare of the videos of any of the technical sessions has been seen, even after two whole months have come and gone.


The only one I'm missing is the very first one of the day by Mark Jessop.  

The McElroy's talk received minute by minute treatment to minimize some abrupt loudness changes.

There are a few patches throughout the day of a second or two duration that sound odd and distorted.  I think this was because of my slow DSL connection stuttering when it couldn't quite keep up.  It was not the result of the recording or compression process.

Hank


Re: Using BMP pressure sensors on HABs - how accurate?

greg@bigredbee.com
 

Coming at this from a high powered rocketry perspective, GPS is going to be a lot more accurate than barometric pressure.  Depending on the particular device you're using, it might be hard to get any sort of meaningful data above 80K'.  For altitude records, we are required to use GPS.

Greg K7RKT TRA #7960

On Mon, Sep 26, 2022 at 10:17 AM Michael Hojnowski <kd2eat@...> wrote:
Gang,

I haven't tried in a while, but does anyone use pressure sensors with
much success in HABs?  The reason I ask is that I have a pile of BMPxxx
sensors and it would be no big deal to add them to a data logger, or
other control systems that are altitude oriented.  I tried one years
ago, but the formulas I had for converting pressure to altitude were
generating wildly different results from the GPS. I just punted at the
time.  I've got a bit of renewed interest, now, in having non-GPS
oriented ways to test altitude.  It seems that using pressure could be a
lot more reliable than hoping I get and maintain a GPS lock, especially
if I have other RF activity going on on the payload.

Thoughts?
Mike / KD2EAT






Using BMP pressure sensors on HABs - how accurate?

Michael Hojnowski
 

Gang,

I haven't tried in a while, but does anyone use pressure sensors with much success in HABs?  The reason I ask is that I have a pile of BMPxxx sensors and it would be no big deal to add them to a data logger, or other control systems that are altitude oriented.  I tried one years ago, but the formulas I had for converting pressure to altitude were generating wildly different results from the GPS. I just punted at the time.  I've got a bit of renewed interest, now, in having non-GPS oriented ways to test altitude.  It seems that using pressure could be a lot more reliable than hoping I get and maintain a GPS lock, especially if I have other RF activity going on on the payload.

Thoughts?
Mike / KD2EAT


Re: HAB Domain Names Free to a Good Home

Rodney Sparks
 

Another one gone! These remain:

nearspacegear.com
20milehighclub.com
20milehighclub.org
20milesup.com
-Rodney

-------- Original Message --------
Subject: Re: [GPSL] HAB Domain Names Free to a Good Home
From: "Rodney Sparks" <rodney@...>
Date: Fri, September 23, 2022 6:20 am
To: "gpsl@groups.io" <gpsl@groups.io>

Alright, two are spoken for... here's what remains.  Domains are free to a good home, housebroken, and are up to date on their shots. ;-)


-Rodney
-------- Original Message --------
Subject: [GPSL] HAB Domain Names Free to a Good Home
From: "Rodney Sparks" <rodney@...>
Date: Wed, September 21, 2022 10:38 am
To: "gpsl@groups.io" <gpsl@groups.io>

Hey guys,

I have a bunch of domain names that I bought back in 2009 when I thought I'd be more active in the hobby, and I'm tired of hemorrhaging money on them.  Any interest?  No charge, unless transfer of domain names costs money. 


I'd rather pass them on to someone with a history in the hobby who can put them to good use, rather than to someone like me who'd squirrel them away for some future pipe dream. ;-)  So, shoot me a message and let me know how you'd make use of one or more of the domain names!

My ambition was to create a forum and a company akin to Estes model rockets, but for HAB.  Not gonna happen anytime soon, but as a mechanical engineer, I'd love to help out anyone who's interested in doing something like that.

Thanks,

-Rodney Sparks


Re: HAB Domain Names Free to a Good Home

Rodney Sparks
 

Alright, two are spoken for... here's what remains.  Domains are free to a good home, housebroken, and are up to date on their shots. ;-)


-Rodney

-------- Original Message --------
Subject: [GPSL] HAB Domain Names Free to a Good Home
From: "Rodney Sparks" <rodney@...>
Date: Wed, September 21, 2022 10:38 am
To: "gpsl@groups.io" <gpsl@groups.io>

Hey guys,

I have a bunch of domain names that I bought back in 2009 when I thought I'd be more active in the hobby, and I'm tired of hemorrhaging money on them.  Any interest?  No charge, unless transfer of domain names costs money. 


I'd rather pass them on to someone with a history in the hobby who can put them to good use, rather than to someone like me who'd squirrel them away for some future pipe dream. ;-)  So, shoot me a message and let me know how you'd make use of one or more of the domain names!

My ambition was to create a forum and a company akin to Estes model rockets, but for HAB.  Not gonna happen anytime soon, but as a mechanical engineer, I'd love to help out anyone who's interested in doing something like that.

Thanks,

-Rodney Sparks


Re: Helium loss

Steve G8KHW / AJ4XE
 

As the picoballooners have found - gas loss through diffusion on the ground is completely different in floating flight.  A foil balloon might loose 1g of lift (out of the 10g or so it was filled with) over 24 hours on the ground under no pressure - yet stay up for months in the air - under 0.2 psi differential pressure.

    Steve G8KHW


On 22/09/2022 22:49, BASE_DePauw wrote:

Although we did not take the time to do repeated trials, earlier this summer we filled a 200 gram Cloudbuster with helium indoors and set it for an initial 200 grams of positive lift.  24 hours later the lift was only 100 grams.  After an additional 24 hours the lift was 50 grams.  One more day and there was no lift at all.

We did not treat the balloon with the HiFloat solution.

Howard

On Thu, Sep 22, 2022 at 5:21 PM Steve G8KHW / AJ4XE <steve@...> wrote:

?

https://www.hi-float.com/

    Steve


On 22/09/2022 21:53, Joe WB9SBD wrote:
If I remember correctly Hi Float is just HE and air , nothing special. so the HE will still escape just as fast and left with an envelope filled with air.

Joe WB9SBD

On 9/22/2022 3:52 PM, rich.m.legrand@... wrote:
Hi Steve, thanks for the information!  That's an interesting suggestion about Hifloat -- it looks like it could make a significant difference.  


Virus-free.www.avg.com


--
Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
DePauw University
2 E. Hanna Street
Greencastle, IN 46135
(765) 658-4653
hlbrooks@...


Re: Helium loss

rich.m.legrand@...
 

A 200 gram cloudbuster filled to 200 grams of positive lift isn't much stretch for that size balloon, but that's still really useful info -- thanks! 


Re: Helium loss

BASE_DePauw
 

Although we did not take the time to do repeated trials, earlier this summer we filled a 200 gram Cloudbuster with helium indoors and set it for an initial 200 grams of positive lift.  24 hours later the lift was only 100 grams.  After an additional 24 hours the lift was 50 grams.  One more day and there was no lift at all.

We did not treat the balloon with the HiFloat solution.

Howard

On Thu, Sep 22, 2022 at 5:21 PM Steve G8KHW / AJ4XE <steve@...> wrote:

?

https://www.hi-float.com/

    Steve


On 22/09/2022 21:53, Joe WB9SBD wrote:
If I remember correctly Hi Float is just HE and air , nothing special. so the HE will still escape just as fast and left with an envelope filled with air.

Joe WB9SBD

On 9/22/2022 3:52 PM, rich.m.legrand@... wrote:
Hi Steve, thanks for the information!  That's an interesting suggestion about Hifloat -- it looks like it could make a significant difference.  


Virus-free.www.avg.com



--
Howard L. Brooks
Professor of Physics and Astronomy
241 Julian Science and Mathematics Center
DePauw University
2 E. Hanna Street
Greencastle, IN 46135
(765) 658-4653
hlbrooks@...


Re: Helium loss

Steve G8KHW / AJ4XE
 

?

https://www.hi-float.com/

    Steve


On 22/09/2022 21:53, Joe WB9SBD wrote:
If I remember correctly Hi Float is just HE and air , nothing special. so the HE will still escape just as fast and left with an envelope filled with air.

Joe WB9SBD

On 9/22/2022 3:52 PM, rich.m.legrand@... wrote:
Hi Steve, thanks for the information!  That's an interesting suggestion about Hifloat -- it looks like it could make a significant difference.  


Virus-free.www.avg.com


Re: Helium loss

Joe WB9SBD
 

If I remember correctly Hi Float is just HE and air , nothing special. so the HE will still escape just as fast and left with an envelope filled with air.

Joe WB9SBD

On 9/22/2022 3:52 PM, rich.m.legrand@... wrote:

Hi Steve, thanks for the information!  That's an interesting suggestion about Hifloat -- it looks like it could make a significant difference.  


Re: Helium loss

rich.m.legrand@...
 

Hi Steve, thanks for the information!  That's an interesting suggestion about Hifloat -- it looks like it could make a significant difference.  


Re: Helium loss

Steve G8KHW / AJ4XE
 

I don't think Kaymont sell any chroroprene balloons (Totex KA and TX series are both latex I think).   For long duration Chloroprene would be better for UV degradation (and I think helium diffusion too).

If you want chloroprene a good source would be the Pioneer (Qualatex / ToyTex) Cloudbusters - (as used for cluster ballooning) - but only available in sizes up to about 600g.

You should consider using HiFloat to reduce helium diffusion (on both latex and chloroprene according to manufacturer).

Helium diffusion seems to be highly dependent on a number factors - loss on the ground is considerably different than at altitude (cold and humidity). 

You should probably seek guidence form previous ballast/gas flight folk (like the Stanford guys).   My longest Chloroprene floater flight was only about 18 hours I'm afraid.

    Steve G8KHW/AJ4XE


On 22/09/2022 20:22, rich.m.legrand@... wrote:
Hey everybody,
We're interested in some extended flights (several days) using simple
latex (chloroprene?)  balloons such as the ones from Kaymont.  We have
a ballast/gas release system that we're designing...  One piece of
information we haven't been able to find is how much helium we can
expect to lose over time.  Does anyone have some metrics or know where
to grab them?

thanks!

Virus-free.www.avg.com


Helium loss

rich.m.legrand@...
 

Hey everybody,
We're interested in some extended flights (several days) using simple
latex (chloroprene?)  balloons such as the ones from Kaymont.  We have
a ballast/gas release system that we're designing...  One piece of
information we haven't been able to find is how much helium we can
expect to lose over time.  Does anyone have some metrics or know where
to grab them?

thanks!


HAB Domain Names Free to a Good Home

Rodney Sparks
 

Hey guys,

I have a bunch of domain names that I bought back in 2009 when I thought I'd be more active in the hobby, and I'm tired of hemorrhaging money on them.  Any interest?  No charge, unless transfer of domain names costs money. 


I'd rather pass them on to someone with a history in the hobby who can put them to good use, rather than to someone like me who'd squirrel them away for some future pipe dream. ;-)  So, shoot me a message and let me know how you'd make use of one or more of the domain names!

My ambition was to create a forum and a company akin to Estes model rockets, but for HAB.  Not gonna happen anytime soon, but as a mechanical engineer, I'd love to help out anyone who's interested in doing something like that.

Thanks,

-Rodney Sparks


Re: DL9RDZ ttgo portable sonde tracker

James Ewen VE6SRV
 

Looks familiar. Just another toy to distract me and take my money. 

But I can chase and recover payloads while letting someone else pay to send them up!

I’m about 50km downwind of an upper air station here in Alberta, so they will be landing all around me for a good part of the year. 

On Sun, Sep 11, 2022 at 22:35 Hank Riley via groups.io <n1ltv=yahoo.com@groups.io> wrote:
Yes, I was about to clarify that the software running in the pic is not the very niche sonde decoding software for which Mark provided the link.

It's an illustration of the llilygo platform scale as far as the display size and the packaging.


On Monday, September 12, 2022 at 12:25:20 AM EDT, Mark Jessop <vk5qi@...> wrote:

As linked in the other thread: https://github.com/dl9rdz/rdz_ttgo_sonde




--
James
VE6SRV


Re: NWS Sonde Chase and Recovery

James Ewen VE6SRV
 

That looks like it might have been the one. 

I was busy setting up and launching a balloon when I saw the device. Didn’t get a good look at it. 

I could have spent a long time trying to find it as an arduino device. 

Thanks!

On Sun, Sep 11, 2022 at 21:30 Mark Jessop <vk5qi@...> wrote:
You are thinking of a TTGO, not an Arduino.

Refer here for information on the firmware that would have been running on it: https://github.com/dl9rdz/rdz_ttgo_sonde

73
Mark VK5QI

On Mon, Sep 12, 2022 at 8:58 AM James Ewen VE6SRV <ve6srv@...> wrote:
That’s what popped up for me when googling, but what I saw was a little arduino unit that fit in the palm of your hand. 

It was self contained, from antenna to LCD display. 

I’ll have to snoop the net to see if I can find the unit that he was using. 

On Sun, Sep 11, 2022 at 10:32 Clif Brown <cliff.brown@...> wrote:
https://www.coaa.co.uk/sondemonitor.htm

It's a trial for 21 days, after which they want payment.

Using it in trial mode worked well.

--
James
VE6SRV

--
James
VE6SRV


Re: HABHub closure

Mark Conner N9XTN
 

Steve,

A big thank you and the team for all the HABHUB functionality, and also thanks to Mark VK5QI and his team for standing up more and more of this functionality on sondehub.org.  The high-altitude balloon community is blessed to have such talent available.

73 de Mark N9XTN

On Mon, Sep 12, 2022 at 12:13 PM Steve G8KHW / AJ4XE <steve@...> wrote:

The HABhub servers will be shut down toward end of this month*.  The HABhub predictor, tracker, SSDV, burst calculator, UKHAS wiki and habitat site will all be affected.

As alternatives I suggest folk use:

    Tracker: https://amateur.sondehub.org/

    Predictor: https://predict.sondehub.org/

    Burst Calculator: https://sondehub.org/calc/

Folk are actively working on alternative solutions for SSDV and the UKHAS wiki (watch this space).

The sondehub tracker does not support the UKHAS sentence interface – this means that dl-fldigi will not work with it.  Mark Jessop has been asking for help to develop a UKHAS sentence interface for SondeHub – so if this is something you feel you could do, then please step forward.  

Some limited support of UKHAS strings is included Horus-GUI decoder (which will also decode some formats of RTTY) – as far as I know this will be the only way to get legacy UKHAS RTTY strings shown on SondeHub. See: https://github.com/projecthorus/horusdemodlib/wiki/1.1-Horus-GUI-Reception-Guide-(Windows-Linux-OSX)

SondeHub has no equivalent of the hourly predictor for HAB flights, however there is something similar for radiosonde sites within the SondeHub radiosonde tracker https://tracker.sondehub.org.

amateur.sondehub.org imports Balloon flights from APRS in the same way as the HABhub tracker – so APRS balloon flights (and pico flights forwarded to APRS) will continue to be shown.
 
Dave Akerman has been beavering away on supporting sondehub on the PITS gateway, HAB Base, Explora and PADD apps.

Some work is underway on migrating TTNHABbridge to use Sondehub.


I'll take this opportunity to say a massive thank you to all that worked habhub tools over the years – the ones I remember are (apologies if I've forgotten you):

    Rossen Georgiev
    Adam Greig,
    Daniel Richman.
    Daniel Saul
    Priyesh Patel
    Mark Jessop
    Jon Sowman
    James Coxon
    Stelios Bounanos
    Philip Heron
    Matthew Brejza

and finally huge thanks to Anthony Stirk for hosting the servers for many years.

     Steve G8KHW / AJ4XE


*this was originally scheduled for the end of the year – but has been brought forward (mainly due to energy crisis).


Virus-free.www.avg.com


HABHub closure

Steve G8KHW / AJ4XE
 

The HABhub servers will be shut down toward end of this month*.  The HABhub predictor, tracker, SSDV, burst calculator, UKHAS wiki and habitat site will all be affected.

As alternatives I suggest folk use:

    Tracker: https://amateur.sondehub.org/

    Predictor: https://predict.sondehub.org/

    Burst Calculator: https://sondehub.org/calc/

Folk are actively working on alternative solutions for SSDV and the UKHAS wiki (watch this space).

The sondehub tracker does not support the UKHAS sentence interface – this means that dl-fldigi will not work with it.  Mark Jessop has been asking for help to develop a UKHAS sentence interface for SondeHub – so if this is something you feel you could do, then please step forward.  

Some limited support of UKHAS strings is included Horus-GUI decoder (which will also decode some formats of RTTY) – as far as I know this will be the only way to get legacy UKHAS RTTY strings shown on SondeHub. See: https://github.com/projecthorus/horusdemodlib/wiki/1.1-Horus-GUI-Reception-Guide-(Windows-Linux-OSX)

SondeHub has no equivalent of the hourly predictor for HAB flights, however there is something similar for radiosonde sites within the SondeHub radiosonde tracker https://tracker.sondehub.org.

amateur.sondehub.org imports Balloon flights from APRS in the same way as the HABhub tracker – so APRS balloon flights (and pico flights forwarded to APRS) will continue to be shown.
 
Dave Akerman has been beavering away on supporting sondehub on the PITS gateway, HAB Base, Explora and PADD apps.

Some work is underway on migrating TTNHABbridge to use Sondehub.


I'll take this opportunity to say a massive thank you to all that worked habhub tools over the years – the ones I remember are (apologies if I've forgotten you):

    Rossen Georgiev
    Adam Greig,
    Daniel Richman.
    Daniel Saul
    Priyesh Patel
    Mark Jessop
    Jon Sowman
    James Coxon
    Stelios Bounanos
    Philip Heron
    Matthew Brejza

and finally huge thanks to Anthony Stirk for hosting the servers for many years.

     Steve G8KHW / AJ4XE


*this was originally scheduled for the end of the year – but has been brought forward (mainly due to energy crisis).


Virus-free.www.avg.com


Re: DL9RDZ ttgo portable sonde tracker

Hank Riley
 

Yes, I was about to clarify that the software running in the pic is not the very niche sonde decoding software for which Mark provided the link.

It's an illustration of the llilygo platform scale as far as the display size and the packaging.


On Monday, September 12, 2022 at 12:25:20 AM EDT, Mark Jessop <vk5qi@...> wrote:

As linked in the other thread: https://github.com/dl9rdz/rdz_ttgo_sonde




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