Date   

Frequency selection for airborne crossband repeaters

Michael Hojnowski
 

Hey Gang,

I'm intending to fly a cross-band repeater with a HAB in April.  It occurs to me that I don't have a good idea of how to select frequencies.  Should I be using one from the repeater input range on one band, and output on another?  Should I be selecting simplex frequencies for this short term use?  Should I attempt any kind of coordination with our regional frequency coordination groups?

What have people done?

Thanks for any advice,
Mike / KD2EAT


Looking for Speakers for the BalloonSat Forum at the Dayton Hamvention

Bill Brown
 

If any of you who will be attending the Dayton Hamvention this year would like to give a 25 minute talk at the BalloonSat Forum  (Friday of the HAmvention), please contact me.

- Bill WB8ELK

WB8ELK at AOL dot com


Exploding Balloons

L. Paul Verhage KD4STH
 


APRS Setup

Keith Kaiser, WA0̷TJT
 

Hi guys!

I’ve been out of the loop for a while … I hope someone notices… LOL

I’m trying to set up a TinyTrack3Plus with a Baofeng UV-3R but I’m not having much success.I can see the red light coming on indicating the TinyTrack is transmitting. I can see the radio going into transmit mode occasionally but the two are not happing at the same time. I’m guessing that means I have the VOX in the radio set wrong or I have one of the many settings in the TT3 set wrong. 

Would one of you maybe walk through the settings for both so I can get this pair working?

Thanks… see you all in Pella.

Keith, WA0̷TJT




Re: New bumper sticker

L. Paul Verhage KD4STH
 

Like it.


On Fri, Feb 15, 2019, 3:04 PM Bill Brown via Groups.Io <wb8elk=aol.com@groups.io> wrote:
Maybe change it to "Keeping your head above the clouds since 1987". -Bill WB8ELK


On Feb 14, 2019, at 9:29 PM, L. Paul Verhage KD4STH <nearsys@...> wrote:

I came up with a new ARHAB bumper sticker idea during dinner at Blaze Pizza.


<head in the clouds.JPG>


Re: New bumper sticker

Bill Brown
 

Maybe change it to "Keeping your head above the clouds since 1987". -Bill WB8ELK


On Feb 14, 2019, at 9:29 PM, L. Paul Verhage KD4STH <nearsys@...> wrote:

I came up with a new ARHAB bumper sticker idea during dinner at Blaze Pizza.


<head in the clouds.JPG>


New bumper sticker

L. Paul Verhage KD4STH
 

I came up with a new ARHAB bumper sticker idea during dinner at Blaze Pizza.



Re: Bill you missed out on a business opportunity

Steve AE8AT
 

Bill,

Thank you for the write up. Enthralling read!

Steve
AE8AT


Re: Bill you missed out on a business opportunity

Jayant Murthy
 

Thanks for writing this. I feel that many of the "new space" people are more caught up with cool than needed.
Jayant

On Thursday, February 14, 2019, 8:49:44 AM GMT+5:30, Bill Brown via Groups.Io <wb8elk@...> wrote:


As often is the case, the pioneers in technology are too far in advance of demand. All I see here is a small rocket launched from a not-very-high hot air balloon. I do wish them success and hopefully they have worked out the math for the optimum liftoff altitude and rocket thrust (and weight) necessary to achieve orbit. There have been dozens of Rockoon startups with fancy CGI graphics, a nicely edited video and great background music who then disappear when they find funding is hard to raise. A hot-air-balloon (or high-altitude zero pressure balloon) would have to be capable of lifting thousands of pounds of rocket to place a small toaster-size payload into LEO orbit and would have to be above 70,000 feet to make it worthwhile. A rockoon is indeed a great first stage replacement. The rocket can be about 25 percent of the weight of an equivalent ground-based launch plus the rocket motor nozzle is more efficient in a near vacuum BUT it is also much harder to ignite in a near vacuum and -60 deg temperatures. We did work out how to do that using a series of weather balloon flights. A small rocket can make it into Space itself but it would come right back down again. Very useful for microgravity and sounding rocket experiments. Plus it gives you the flexibility of moving your launchsite around on a boat which we proved out 20 years ago since you can cancel out the surface winds completely by steering the boat along with the wind (up to the speed limitation of the boat). James Van Allen sent some of his rockoons thousands of miles into Space but didn't achieve orbital velocity and he also did most of his flights from the decks of Navy ships. That's where you need a much heavier rocket to achieve orbit, even with a Rockoon.

They seem to imply that they will be using a hot air balloon at 58,000 feet to launch their rockoon. While I was at the NearSpace Conference in Poland I had to pleasure to hear a talk about a fellow who took a hot-air balloon to 32,000 feet and beyond. It took an enormous redesign of their propane burners to work at that altitude and even after all their design efforts they still failed to keep burning after they got close to their altitude goal. I did find a story about a balloon pilot in India who made it to 69850 feet but the hot air balloon envelope was enormous and likely not capable of lifting thousands of pounds of rocket in addition.

The available launchsites for a Rockoon are very limited. Basically Black Rock Desert in Nevada, Spaceport America in New Mexico, some of the larger military bases and even a possibility in Sheboygan WI across Lake Michigan. However you cannot go past the range limits which is a real problem for a high altitude balloon and even worse you would have to prove that your rocket will land within the range after going into Space and back if it fails to achieve orbit. We solved that problem by heading out to sea on a large oil supply boat and had to be 200 miles from the coastline to launch the rocket. And yes we had FAA permission and also had to coordinate with the Coast Guard, the Navy and the Air Force. It actually took longer to get permission from all of these agencies than it did to design and build the Rockoon system. We flew a 400 pound rocket from a 500,000 cubic foot Raven zero-pressure balloon....it took 33 tanks of helium.

 So it boils down to whether a hot air balloon of that magnitude and flight logistics combined with the range limitations is a cost effective way to launch small satellites with a 25 percent lighter-weight rocket than a ground-based rocket. 

- Bill WB8ELK


-----Original Message-----
From: Zack Clobes W0ZC <zclobes@...>
To: GPSL <GPSL@groups.io>
Sent: Wed, Feb 13, 2019 6:02 pm
Subject: [GPSL] Bill you missed out on a business opportunity


Re: Bill you missed out on a business opportunity

Bill Brown
 

As often is the case, the pioneers in technology are too far in advance of demand. All I see here is a small rocket launched from a not-very-high hot air balloon. I do wish them success and hopefully they have worked out the math for the optimum liftoff altitude and rocket thrust (and weight) necessary to achieve orbit. There have been dozens of Rockoon startups with fancy CGI graphics, a nicely edited video and great background music who then disappear when they find funding is hard to raise. A hot-air-balloon (or high-altitude zero pressure balloon) would have to be capable of lifting thousands of pounds of rocket to place a small toaster-size payload into LEO orbit and would have to be above 70,000 feet to make it worthwhile. A rockoon is indeed a great first stage replacement. The rocket can be about 25 percent of the weight of an equivalent ground-based launch plus the rocket motor nozzle is more efficient in a near vacuum BUT it is also much harder to ignite in a near vacuum and -60 deg temperatures. We did work out how to do that using a series of weather balloon flights. A small rocket can make it into Space itself but it would come right back down again. Very useful for microgravity and sounding rocket experiments. Plus it gives you the flexibility of moving your launchsite around on a boat which we proved out 20 years ago since you can cancel out the surface winds completely by steering the boat along with the wind (up to the speed limitation of the boat). James Van Allen sent some of his rockoons thousands of miles into Space but didn't achieve orbital velocity and he also did most of his flights from the decks of Navy ships. That's where you need a much heavier rocket to achieve orbit, even with a Rockoon.

They seem to imply that they will be using a hot air balloon at 58,000 feet to launch their rockoon. While I was at the NearSpace Conference in Poland I had to pleasure to hear a talk about a fellow who took a hot-air balloon to 32,000 feet and beyond. It took an enormous redesign of their propane burners to work at that altitude and even after all their design efforts they still failed to keep burning after they got close to their altitude goal. I did find a story about a balloon pilot in India who made it to 69850 feet but the hot air balloon envelope was enormous and likely not capable of lifting thousands of pounds of rocket in addition.

The available launchsites for a Rockoon are very limited. Basically Black Rock Desert in Nevada, Spaceport America in New Mexico, some of the larger military bases and even a possibility in Sheboygan WI across Lake Michigan. However you cannot go past the range limits which is a real problem for a high altitude balloon and even worse you would have to prove that your rocket will land within the range after going into Space and back if it fails to achieve orbit. We solved that problem by heading out to sea on a large oil supply boat and had to be 200 miles from the coastline to launch the rocket. And yes we had FAA permission and also had to coordinate with the Coast Guard, the Navy and the Air Force. It actually took longer to get permission from all of these agencies than it did to design and build the Rockoon system. We flew a 400 pound rocket from a 500,000 cubic foot Raven zero-pressure balloon....it took 33 tanks of helium.

 So it boils down to whether a hot air balloon of that magnitude and flight logistics combined with the range limitations is a cost effective way to launch small satellites with a 25 percent lighter-weight rocket than a ground-based rocket. 

- Bill WB8ELK


-----Original Message-----
From: Zack Clobes W0ZC <zclobes@...>
To: GPSL <GPSL@groups.io>
Sent: Wed, Feb 13, 2019 6:02 pm
Subject: [GPSL] Bill you missed out on a business opportunity


Bill you missed out on a business opportunity

Zack Clobes W0ZC
 


Cold air

Joe WB9SBD
 

With the super cold temps we have had here the past two days It was 30 below this morning. 60+ below wind chill.

But anyway the 30 below got me to wonder what the temps aloft were like and was amazed, at the lower levels it actually gets warmer as you go up. Interesting!

Joe WB9SBD

--

The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
--

The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com


Re: Updates to KML Log Konverter

Carlton Corbitt
 

Hi Zach,

Thanks for posting, i had been planning on using some time this winter to get together some videos on past flights.
I didn't konw of Konverter, but i'll give the tool a try,  it should help me speed up the process some.

Carlton
KI4NHK


Updates to KML Log Konverter

Zack Clobes W0ZC
 

I'm not sure if anyone is using my KML Konverter tool, but I recently updated it to include telemetry data in the spreadsheet output file.  Any arbitrary data sets within the comments section of the APRS packet will be broken out and listed in the download.  See the announcement for more information.




Zack Clobes, W0ZC
Project: Traveler
www.projecttraveler.org

Join us on Facebook for the latest information:



Project: Traveler is a research project of Custom Digital Services, LLC.


HAB video from Chile

Mark Conner N9XTN
 


Texas Groups?

L. Paul Verhage KD4STH
 

I'm looking for someone near Houston that can launch a weather balloon for a student. Thanks


Long duration high altitude balloons

Mark Conner N9XTN
 


Selection of Frequencies and repeaters.

Jason Unwin
 

I am going to start putting repeaters into my new Yaesu FT2D. I have a few questions:

1. How do you select the repeaters to use for your launches?

2. How do you decide on the frequencies to use for the launch?

 

 

Again, I'm trying to get something going here in Oklahoma. 

 

Jason Unwin

KF5UEF


The Stargazing Almanac

L. Paul Verhage KD4STH
 

For anyone interested in my stargazing newsletter, I just posted December's. It's at, https://stargazingalmanac.substack.com/


Re: Rasberry Pi and High Altitude Balloons

L. Paul Verhage KD4STH
 

My last three articles in Nuts and Volts cover this topic. I have notes and code in each article.


On Mon, Oct 29, 2018, 4:31 PM Jason Unwin via Groups.Io <generalripper_1999=yahoo.com@groups.io> wrote:
Our Civil Air Patrol Squadron got some Raspberry Pi kits for STEM activities. We might have a couple left over when we are done. I am wondering if there are any kits or additional "sensors" we can add to the basic Raspberry Pi for a HAB flight. Specifically something to help track the payloads and possibly a way to log air temperature, density, humidity, or maybe even cosmic radiation. Any thoughts and links to ideas is greatly appreciated.


Jason Unwin
KF5UEF