Date   

Re: 4FSK at GPSL

Mark Jessop
 

Just as a bit of background information here - I developed this mode ('Horus Binary') a few years ago, as an attempt at producing a HAB telemetry mode that:
- Used a modem which was very robust,
- ... but would still provide a reasonable position update rate (every few seconds)
- ... did not require any proprietary modem ICs (e.g. LoRa), and
- ... would be completely open source.

I worked with David Rowe (rowetel.com) on this, and we ended up settling on 4-FSK, which was relatively easy to generate via a variety of means. We started out using RadioMetrix modules modulated using an ADC on an Arduino, but eventually moved to using the Si4032 transceiver IC found on the RS41 radiosondes as our reference platform. The occupied bandwidth of the 'reference' implementation is ~ 1kHz, which is mainly set by the minimum frequency shift possible on the Si4032 (270 Hz). In most cases the transmit power used is only 25mW.

The modem uses 4-FSK at 100 baud, with a binary telemetry format utilising Golay(23,12) forward-error-correction. The demodulator is available as graphical user interface utility ('Horus-GUI') which runs on Windows, Linux, and OSX, and also as a command-line utility perfect for 'headless' decoding.
At this baud rate, the modem is *extremely* robust. Reception of a 25mW transmitter is easily possible at ranges > 200km with nothing more than a RTLSDR and a 1/4-wave mag-mount, giving it a very low barrier to entry.

All the information on the mode is available here: https://github.com/projecthorus/horusdemodlib/wiki
The current 'reference implementation' uses re-purposed Vaisala RS41 radiosondes, and software here: https://github.com/mikaelnousiainen/RS41ng

73
Mark VK5QI


4FSK at GPSL

Michael Hojnowski
 

Gang,

I intend to fly a 4FSK payload on a re-tasked RS41 NWS Weathersonde.  If anyone is interested in setting up a receiving station, or is also planning to do a 4FSK tracker, please do let me know.  We can probably fly / track several simultaneously on the same frequency with some coordination.  I flew one on our flight yesterday, and it was phenomenal.  For the price of a foxhunt to collect one, two fresh AA Ultimate Lithiums, and a few minutes to reprogram it, you can't beat the price/performance!

It can be received with a cheap RTLSDR on a Raspberry Pi.  I had one in my mobile ground station.  The code is here: https://github.com/projecthorus/horusdemodlib

Anyway, if there's any interest, let me know.  It would be fun to fly a few of these.  Oh, I also had it beaconing APRS on 70cm as well, so that's fairly convenient too.

Mike / KD2EAT


Re: W2CXM Balloon Launch: Sunday, May 8, 12:00pm

stan siems
 

If some pilot see's that bear he is going to think he is seeing things not normal !


On 5/6/2022 3:53 PM, Michael Hojnowski wrote:

High Altitude Balloon Launch and Zoom Meeting


Bear in a
          space suitOn Sunday, May 8, 2022 at 12:00pm the Cornell Amateur Radio club will be doing a High Altitude Balloon launch.  The main payload is expected to climb to about 100,000 feet.  Shortly before apogee, we intend to release “Homerun the Bear” on a small parachute.  Homerun, is a protege of Touchdown the Bear, who completed a similar flight in May of 2019.  Join our zoom meeting to see the launch, chase, and hopeful recovery of both Homerun, and the main payload box (which has lots of cameras).  During the livestream, we’ll be discussing the various components of our payload as well as some of the technology and planning that goes into such a flight.

 

Schedule for Sunday, May 8, 2022(all times EDT and approximate):

  • 12:00 Coverage Begins
  • 12:15 Launch
  • 13:45 Bear Drop
  • 13:55 Balloon Burst
  • 14:35 Payloads land, recovery coverage begins
  • 15:30 Stream ends after teams gleefully show recovered bear and payload (hopefully!)

 

The zoom information follows:

 

Time: May 8, 2022 12:00 PM Eastern Time (US and Canada)

 

Join Zoom Meeting

https://cornell.zoom.us/j/98465701095?pwd=QkE1YU91WUFOZ0h6WGtwN2h3eHB0dz09

 

Meeting ID: 984 6570 1095

Passcode: 256193

One tap mobile

+16468769923,,98465701095# US (New York)

+16465189805,,98465701095# US (New York)

 

Meeting ID: 984 6570 1095

Find your local number: https://cornell.zoom.us/u/abrZlkmKQt

 

A few days after the launch,, we will publish a video summarizing the flight on the W2CXM youtube channel at:   https://www.youtube.com/channel/UC_bR3oU5WFqyr0DrdO-_a8w 

-- 
Thanks

Stan Siems

CNS INTERNET SERVICES

319-231-3449

The difficult we do right away the impossible just takes a little longer.

Semper FI


W2CXM Balloon Launch: Sunday, May 8, 12:00pm

Michael Hojnowski
 

High Altitude Balloon Launch and Zoom Meeting


Bear in a space
        suitOn Sunday, May 8, 2022 at 12:00pm the Cornell Amateur Radio club will be doing a High Altitude Balloon launch.  The main payload is expected to climb to about 100,000 feet.  Shortly before apogee, we intend to release “Homerun the Bear” on a small parachute.  Homerun, is a protege of Touchdown the Bear, who completed a similar flight in May of 2019.  Join our zoom meeting to see the launch, chase, and hopeful recovery of both Homerun, and the main payload box (which has lots of cameras).  During the livestream, we’ll be discussing the various components of our payload as well as some of the technology and planning that goes into such a flight.

 

Schedule for Sunday, May 8, 2022(all times EDT and approximate):

  • 12:00 Coverage Begins
  • 12:15 Launch
  • 13:45 Bear Drop
  • 13:55 Balloon Burst
  • 14:35 Payloads land, recovery coverage begins
  • 15:30 Stream ends after teams gleefully show recovered bear and payload (hopefully!)

 

The zoom information follows:

 

Time: May 8, 2022 12:00 PM Eastern Time (US and Canada)

 

Join Zoom Meeting

https://cornell.zoom.us/j/98465701095?pwd=QkE1YU91WUFOZ0h6WGtwN2h3eHB0dz09

 

Meeting ID: 984 6570 1095

Passcode: 256193

One tap mobile

+16468769923,,98465701095# US (New York)

+16465189805,,98465701095# US (New York)

 

Meeting ID: 984 6570 1095

Find your local number: https://cornell.zoom.us/u/abrZlkmKQt

 

A few days after the launch,, we will publish a video summarizing the flight on the W2CXM youtube channel at:   https://www.youtube.com/channel/UC_bR3oU5WFqyr0DrdO-_a8w 


Re: GPSL 2022 estimate attendance count

Mark Conner N9XTN
 

Hi Bill,

I've got a lot of uncertainty around my July schedule due to travel for work and family vacation.  I'd sure love to come back to Purdue for this event but I'm not sure I can swing it this year.

I don't know if your PARC contact might have done it already, but when I was there in the mid 90s the Tippecanoe Amateur Radio Association (TARA) was pretty active.  You can probably spark some interest by contacting them.  Their website is www.w9reg.org.

73 de Mark N9XTN


On Mon, May 2, 2022 at 3:20 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi All,

 We have made reservations for a large conference hall at the Beck AG Center just west of Purdue University in Lafayette IN for GPSL 2022.  I will need an estimated head count to start making arrangements for tables, chairs and catering so please let me know on this list if you are planning to attend in person or at least thinking of attending it in person.

The date is Friday, July 15th, 2022 with launch site also from the grounds of the Ag Center on Saturday morning July 16th.

We also plan to link the conference to a Zoom session for those who can't attend just like the past two years.

- Bill WB8ELK


Re: amateur.sondehub.org

Michael Hojnowski
 

Gang,

My bad.  I gave the right domain name in the subject, but the wrong in the body of my message.  Its:

https://amateur.sondehub.org

Thanks to Bill for pointing that out, and sorry about that.
Mike / KD2EAT

On 5/3/2022 3:14 PM, Michael Hojnowski via groups.io wrote:
Gang,

Just FYI, the group that runs sondehub is setting up a newer tracking site for amateur balloons.    As I understand it, right now it's receiving the same data as habhub, but I can tell you it performs a LOT better.  In my recent flights, habhub lagged by up to 20 minutes behind the APRS stream.   https://amateur.habhub.org is VERY responsive.  They're also set up to take 4FSK traffic from those of us who are refitting RS-41 radiosondes with new firmware to use for our balloons.   They also intend to add more bells and whistles as they go.   I intend to use the new site as much as possible.

Mike / KD2EAT




Re: A Boeing 737 encounters an amateur stratospheric balloon - cross posting from Ballons Haute Altitude France

Steve G8KHW / AJ4XE
 

https://www.youtube.com/watch?v=Np0wqLKK0R


amateur.sondehub.org

Michael Hojnowski
 

Gang,

Just FYI, the group that runs sondehub is setting up a newer tracking site for amateur balloons.    As I understand it, right now it's receiving the same data as habhub, but I can tell you it performs a LOT better.  In my recent flights, habhub lagged by up to 20 minutes behind the APRS stream.   https://amateur.habhub.org is VERY responsive.  They're also set up to take 4FSK traffic from those of us who are refitting RS-41 radiosondes with new firmware to use for our balloons.   They also intend to add more bells and whistles as they go.   I intend to use the new site as much as possible.

Mike / KD2EAT


A Boeing 737 encounters an amateur stratospheric balloon - cross posting from Ballons Haute Altitude France

Steve G8KHW / AJ4XE
 


Re: GPSL 2022 estimate attendance count

L. Paul Verhage KD4STH
 

I'm going to see if I can reschedule my events, but right now I'm not very sure of it.


On Tue, May 3, 2022, 9:05 AM Keith Kaiser, WA0̷TJT <wa0tjt@...> wrote:
The event won’t be the same without its 'father' Paul.

Keith, WA0̷TJT
Take a look at: https://net-control.us
Then consider joining: https://groups.io/g/NCM

On May 3, 2022, at 9:21 AM, L. Paul Verhage KD4STH <nearsys@...> wrote:

I'm not going to be able to make it this year.

On Mon, May 2, 2022, 2:20 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi All,

 We have made reservations for a large conference hall at the Beck AG Center just west of Purdue University in Lafayette IN for GPSL 2022.  I will need an estimated head count to start making arrangements for tables, chairs and catering so please let me know on this list if you are planning to attend in person or at least thinking of attending it in person.

The date is Friday, July 15th, 2022 with launch site also from the grounds of the Ag Center on Saturday morning July 16th.

We also plan to link the conference to a Zoom session for those who can't attend just like the past two years.

- Bill WB8ELK




Re: HabHub Today

Keith Kaiser, WA0̷TJT
 

There is now one balloon showing over North Dakota, launched from Minnesota apparently. 
Thanks for this info Bill, I just did a fairly long explanation of balloons on Saturday and one of the attendees was asking about the lack of any activity.


Keith, WA0̷TJT
Take a look at: https://net-control.us
Then consider joining: https://groups.io/g/NCM

On May 3, 2022, at 10:10 AM, Bill Brown via groups.io <wb8elk@...> wrote:

I have noticed that there are occasional gaps  where they stop gathering APRS balloons for awhile that aren't directly reporting to Habhub These gaps can be a few minutes to over an hour at times. I heard once that it might be due to their script that gathers APRS balloon data. I remember once it was out for a day and when I enquired they had to reset the APRS script.  Perhaps someone from UKHAS can explain it better than I remember as to how they import APRS balloon data. I do know that an APRS balloon has to be above 2000 meters in altitude before they consider it a balloon.

The other possibility is that there are no balloons over the US today :-)

- Bill WB8ELK


-----Original Message-----
From: Keith Kaiser, WA0̷TJT <wa0tjt@...>
To: GPSL@groups.io
Sent: Tue, May 3, 2022 8:55 am
Subject: [GPSL] HabHub Today

I don’t see even one balloon over the U.S. today. Seems unlikely there are none, anyone know why it looks this way?

Keith, WA0̷TJT
Take a look at: https://net-control.us
Then consider joining: https://groups.io/g/NCM



Re: HabHub Today

Bill Brown
 

I have noticed that there are occasional gaps  where they stop gathering APRS balloons for awhile that aren't directly reporting to Habhub These gaps can be a few minutes to over an hour at times. I heard once that it might be due to their script that gathers APRS balloon data. I remember once it was out for a day and when I enquired they had to reset the APRS script.  Perhaps someone from UKHAS can explain it better than I remember as to how they import APRS balloon data. I do know that an APRS balloon has to be above 2000 meters in altitude before they consider it a balloon.

The other possibility is that there are no balloons over the US today :-)

- Bill WB8ELK


-----Original Message-----
From: Keith Kaiser, WA0̷TJT <wa0tjt@...>
To: GPSL@groups.io
Sent: Tue, May 3, 2022 8:55 am
Subject: [GPSL] HabHub Today

I don’t see even one balloon over the U.S. today. Seems unlikely there are none, anyone know why it looks this way?

Keith, WA0̷TJT
Take a look at: https://net-control.us
Then consider joining: https://groups.io/g/NCM


Re: GPSL 2022 estimate attendance count

Keith Kaiser, WA0̷TJT
 

The event won’t be the same without its 'father' Paul.

Keith, WA0̷TJT
Take a look at: https://net-control.us
Then consider joining: https://groups.io/g/NCM

On May 3, 2022, at 9:21 AM, L. Paul Verhage KD4STH <nearsys@...> wrote:

I'm not going to be able to make it this year.

On Mon, May 2, 2022, 2:20 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi All,

 We have made reservations for a large conference hall at the Beck AG Center just west of Purdue University in Lafayette IN for GPSL 2022.  I will need an estimated head count to start making arrangements for tables, chairs and catering so please let me know on this list if you are planning to attend in person or at least thinking of attending it in person.

The date is Friday, July 15th, 2022 with launch site also from the grounds of the Ag Center on Saturday morning July 16th.

We also plan to link the conference to a Zoom session for those who can't attend just like the past two years.

- Bill WB8ELK




Re: GPSL 2022 estimate attendance count

L. Paul Verhage KD4STH
 

I'm not going to be able to make it this year.


On Mon, May 2, 2022, 2:20 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi All,

 We have made reservations for a large conference hall at the Beck AG Center just west of Purdue University in Lafayette IN for GPSL 2022.  I will need an estimated head count to start making arrangements for tables, chairs and catering so please let me know on this list if you are planning to attend in person or at least thinking of attending it in person.

The date is Friday, July 15th, 2022 with launch site also from the grounds of the Ag Center on Saturday morning July 16th.

We also plan to link the conference to a Zoom session for those who can't attend just like the past two years.

- Bill WB8ELK


HabHub Today

Keith Kaiser, WA0̷TJT
 

I don’t see even one balloon over the U.S. today. Seems unlikely there are none, anyone know why it looks this way?

Keith, WA0̷TJT
Take a look at: https://net-control.us
Then consider joining: https://groups.io/g/NCM


Re: GPSL 2022 estimate attendance count

Zack Clobes W0ZC
 

Mira and I won't be able to make it this year. Will try to listen in if the work schedule allows.

Zack

On Mon, May 2, 2022 at 3:20 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi All,

 We have made reservations for a large conference hall at the Beck AG Center just west of Purdue University in Lafayette IN for GPSL 2022.  I will need an estimated head count to start making arrangements for tables, chairs and catering so please let me know on this list if you are planning to attend in person or at least thinking of attending it in person.

The date is Friday, July 15th, 2022 with launch site also from the grounds of the Ag Center on Saturday morning July 16th.

We also plan to link the conference to a Zoom session for those who can't attend just like the past two years.

- Bill WB8ELK


Re: GPSL 2022 estimate attendance count

Jerry
 

The 2 of us will probably be there but need a few days to look at options


Jerry



On Monday, May 2, 2022, 01:20:27 PM MST, Bill Brown via groups.io <wb8elk@...> wrote:


Hi All,

 We have made reservations for a large conference hall at the Beck AG Center just west of Purdue University in Lafayette IN for GPSL 2022.  I will need an estimated head count to start making arrangements for tables, chairs and catering so please let me know on this list if you are planning to attend in person or at least thinking of attending it in person.

The date is Friday, July 15th, 2022 with launch site also from the grounds of the Ag Center on Saturday morning July 16th.

We also plan to link the conference to a Zoom session for those who can't attend just like the past two years.

- Bill WB8ELK


Re: GPSL 2022 estimate attendance count

BASE_DePauw
 

Bill,

BASE DePauw will be there on Friday.  I will have two or three students with me.  Can't commit to the launch on Saturday (the 16th is our 45th Wedding Anniversary).  I will see if any of my faculty colleagues will be able to attend, too.

Howard



On Mon, May 2, 2022 at 4:20 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi All,

 We have made reservations for a large conference hall at the Beck AG Center just west of Purdue University in Lafayette IN for GPSL 2022.  I will need an estimated head count to start making arrangements for tables, chairs and catering so please let me know on this list if you are planning to attend in person or at least thinking of attending it in person.

The date is Friday, July 15th, 2022 with launch site also from the grounds of the Ag Center on Saturday morning July 16th.

We also plan to link the conference to a Zoom session for those who can't attend just like the past two years.

- Bill WB8ELK



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


Re: GPSL 2022 estimate attendance count

ctlyster
 

I plan to attend also for my first time. Hopefully we will have good weather!

73'S
Carl


Re: GPSL 2022 estimate attendance count

Keith Kaiser, WA0̷TJT
 

I’m so disappointed Deb and I won’t be able to attend. We will be in northern Minnesota for a family reunion that weekend. We will try and attend via the Zoom for a while anyway. Good luck everyone, have a great time.

73

Keith, WA0̷TJT
Take a look at: https://net-control.us
Then consider joining: https://groups.io/g/NCM

On May 2, 2022, at 3:20 PM, Bill Brown via groups.io <wb8elk@...> wrote:

Hi All,

 We have made reservations for a large conference hall at the Beck AG Center just west of Purdue University in Lafayette IN for GPSL 2022.  I will need an estimated head count to start making arrangements for tables, chairs and catering so please let me know on this list if you are planning to attend in person or at least thinking of attending it in person.

The date is Friday, July 15th, 2022 with launch site also from the grounds of the Ag Center on Saturday morning July 16th.

We also plan to link the conference to a Zoom session for those who can't attend just like the past two years.

- Bill WB8ELK

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