Date   

Re: Historical data

Luis Eduardo Pacheco
 

Ok. Good luck on that.

Luis E.Pacheco / Editor
lep@...

StratoCat - History and present of the use of stratospheric balloons in the fields of science, military and aerospace
https://stratocat.com.ar/indexe.html




El vie, 12 feb 2021 a las 16:50, Margie Kay (<momufonasd@...>) escribió:
The objects over Kansas City were definately at 2,900 feet. They were first under the clouds, then cloud cover came in and partially covered them. We have a record of that at wunderground.com. The videos taken were clearly of objects close to the Earth. They remained in place for 6 hours and 20 minutes, then moved west. Obviously, what was seen was not the balloons in question, but I really appreciate you giving me this information and I'll add it to our reports. We are also checking Flight Radar 24.

Sincerely,

On Fri, Feb 12, 2021 at 11:45 AM Luis Eduardo Pacheco <stratocat.iespana.es@...> wrote:
The balloons I refer to were never flying so low (2.900 feet) Don't know if it was a typo or not in your message but they moved between 60.000 and 70.000 ft well above air traffic. 

The wind can be tricky. You can have no wind on the surface and 5.000 feet above a 80 mph wind. Or even wind moving in opposite directions according to the altitude. 

These balloons as occur with the Project Loon balloons can be steered in some way by choosing the altitude. They can hover over an area of interest. That makes sense as the balloons launched from Cumberland in June 2019 were part of a DARPA surveillance program. 

Cheers

Luis E.Pacheco / Editor
lep@...

StratoCat - History and present of the use of stratospheric balloons in the fields of science, military and aerospace
https://stratocat.com.ar/indexe.html




El vie, 12 feb 2021 a las 14:30, Margie Kay (<momufonasd@...>) escribió:
Thank you for the information, Luis. Can these types of balloons remain stationary at 2,900 feet for hours?  I thought they moved with the wind.

On Fri, Feb 12, 2021 at 10:34 AM Luis Eduardo Pacheco <stratocat.iespana.es@...> wrote:
Hi Margie. 

I think you are looking for information on the two white objects that appeared that day in the city. 

The probable origin were two Thunderhead balloons of the three launched from Cumberland (Maryland) the previous day which crossed the US from east to west. 

The flight information I have is the following:

HBAL0289 - A27A9E - N259TH - Launch 18/06/2019 - 1:00 utc - Cumberland (MD) - Landed ~ 1:30 utc 25/6/2019 - 10 Miles SW of Cottonwood, California
HBAL0290 - A280AE - N260TH - Launch 18/06/2019 - 1:30 utc - Cumberland (MD) - Landed ~ 11:00 utc 26/6/2019 - Near Canby, California
HBAL0291 - A25CE6 - N251TH - Launch 18/06/2019 - 2:30 utc - Cumberland (MD) - Landed ~15:00 utc 25/6/2019 - 10 Miles NE of Paskenta, California 

If you have at MUFON a Flight Radar 24 Gold Account or Business Account (you must have one, believe me) with the numbers marked in red and the callsign (HBALXXXX) you will be able to reconstruct the flight path of the balloons to confirm the sighting. 

Hope this helps

Best regards

Luis E.Pacheco / Editor
lep@...

StratoCat - History and present of the use of stratospheric balloons in the fields of science, military and aerospace
https://stratocat.com.ar/indexe.html




El vie, 12 feb 2021 a las 12:58, Margie Kay (<momufonasd@...>) escribió:
Where can I find historical data for balloon launches?  Looking for June 20, 2019 over Kansas City, Missouri from 2 pm to 9 pm.

Thank you!

--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri
816-833-1602 (office)



--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri

OZ UFO Conference June 5-6, 2021​

816-833-1602 (office)



--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri

OZ UFO Conference June 5-6, 2021​

816-833-1602 (office)


Re: Historical data

Margie Kay
 

The objects over Kansas City were definately at 2,900 feet. They were first under the clouds, then cloud cover came in and partially covered them. We have a record of that at wunderground.com. The videos taken were clearly of objects close to the Earth. They remained in place for 6 hours and 20 minutes, then moved west. Obviously, what was seen was not the balloons in question, but I really appreciate you giving me this information and I'll add it to our reports. We are also checking Flight Radar 24.

Sincerely,


On Fri, Feb 12, 2021 at 11:45 AM Luis Eduardo Pacheco <stratocat.iespana.es@...> wrote:
The balloons I refer to were never flying so low (2.900 feet) Don't know if it was a typo or not in your message but they moved between 60.000 and 70.000 ft well above air traffic. 

The wind can be tricky. You can have no wind on the surface and 5.000 feet above a 80 mph wind. Or even wind moving in opposite directions according to the altitude. 

These balloons as occur with the Project Loon balloons can be steered in some way by choosing the altitude. They can hover over an area of interest. That makes sense as the balloons launched from Cumberland in June 2019 were part of a DARPA surveillance program. 

Cheers

Luis E.Pacheco / Editor
lep@...

StratoCat - History and present of the use of stratospheric balloons in the fields of science, military and aerospace
https://stratocat.com.ar/indexe.html




El vie, 12 feb 2021 a las 14:30, Margie Kay (<momufonasd@...>) escribió:
Thank you for the information, Luis. Can these types of balloons remain stationary at 2,900 feet for hours?  I thought they moved with the wind.

On Fri, Feb 12, 2021 at 10:34 AM Luis Eduardo Pacheco <stratocat.iespana.es@...> wrote:
Hi Margie. 

I think you are looking for information on the two white objects that appeared that day in the city. 

The probable origin were two Thunderhead balloons of the three launched from Cumberland (Maryland) the previous day which crossed the US from east to west. 

The flight information I have is the following:

HBAL0289 - A27A9E - N259TH - Launch 18/06/2019 - 1:00 utc - Cumberland (MD) - Landed ~ 1:30 utc 25/6/2019 - 10 Miles SW of Cottonwood, California
HBAL0290 - A280AE - N260TH - Launch 18/06/2019 - 1:30 utc - Cumberland (MD) - Landed ~ 11:00 utc 26/6/2019 - Near Canby, California
HBAL0291 - A25CE6 - N251TH - Launch 18/06/2019 - 2:30 utc - Cumberland (MD) - Landed ~15:00 utc 25/6/2019 - 10 Miles NE of Paskenta, California 

If you have at MUFON a Flight Radar 24 Gold Account or Business Account (you must have one, believe me) with the numbers marked in red and the callsign (HBALXXXX) you will be able to reconstruct the flight path of the balloons to confirm the sighting. 

Hope this helps

Best regards

Luis E.Pacheco / Editor
lep@...

StratoCat - History and present of the use of stratospheric balloons in the fields of science, military and aerospace
https://stratocat.com.ar/indexe.html




El vie, 12 feb 2021 a las 12:58, Margie Kay (<momufonasd@...>) escribió:
Where can I find historical data for balloon launches?  Looking for June 20, 2019 over Kansas City, Missouri from 2 pm to 9 pm.

Thank you!

--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri
816-833-1602 (office)



--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri

OZ UFO Conference June 5-6, 2021​

816-833-1602 (office)



--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri

OZ UFO Conference June 5-6, 2021​

816-833-1602 (office)


Re: Historical data

Luis Eduardo Pacheco
 

The balloons I refer to were never flying so low (2.900 feet) Don't know if it was a typo or not in your message but they moved between 60.000 and 70.000 ft well above air traffic. 

The wind can be tricky. You can have no wind on the surface and 5.000 feet above a 80 mph wind. Or even wind moving in opposite directions according to the altitude. 

These balloons as occur with the Project Loon balloons can be steered in some way by choosing the altitude. They can hover over an area of interest. That makes sense as the balloons launched from Cumberland in June 2019 were part of a DARPA surveillance program. 

Cheers

Luis E.Pacheco / Editor
lep@...

StratoCat - History and present of the use of stratospheric balloons in the fields of science, military and aerospace
https://stratocat.com.ar/indexe.html




El vie, 12 feb 2021 a las 14:30, Margie Kay (<momufonasd@...>) escribió:
Thank you for the information, Luis. Can these types of balloons remain stationary at 2,900 feet for hours?  I thought they moved with the wind.

On Fri, Feb 12, 2021 at 10:34 AM Luis Eduardo Pacheco <stratocat.iespana.es@...> wrote:
Hi Margie. 

I think you are looking for information on the two white objects that appeared that day in the city. 

The probable origin were two Thunderhead balloons of the three launched from Cumberland (Maryland) the previous day which crossed the US from east to west. 

The flight information I have is the following:

HBAL0289 - A27A9E - N259TH - Launch 18/06/2019 - 1:00 utc - Cumberland (MD) - Landed ~ 1:30 utc 25/6/2019 - 10 Miles SW of Cottonwood, California
HBAL0290 - A280AE - N260TH - Launch 18/06/2019 - 1:30 utc - Cumberland (MD) - Landed ~ 11:00 utc 26/6/2019 - Near Canby, California
HBAL0291 - A25CE6 - N251TH - Launch 18/06/2019 - 2:30 utc - Cumberland (MD) - Landed ~15:00 utc 25/6/2019 - 10 Miles NE of Paskenta, California 

If you have at MUFON a Flight Radar 24 Gold Account or Business Account (you must have one, believe me) with the numbers marked in red and the callsign (HBALXXXX) you will be able to reconstruct the flight path of the balloons to confirm the sighting. 

Hope this helps

Best regards

Luis E.Pacheco / Editor
lep@...

StratoCat - History and present of the use of stratospheric balloons in the fields of science, military and aerospace
https://stratocat.com.ar/indexe.html




El vie, 12 feb 2021 a las 12:58, Margie Kay (<momufonasd@...>) escribió:
Where can I find historical data for balloon launches?  Looking for June 20, 2019 over Kansas City, Missouri from 2 pm to 9 pm.

Thank you!

--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri
816-833-1602 (office)



--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri

OZ UFO Conference June 5-6, 2021​

816-833-1602 (office)


Re: Historical data

Margie Kay
 

Thank you for the information, Luis. Can these types of balloons remain stationary at 2,900 feet for hours?  I thought they moved with the wind.


On Fri, Feb 12, 2021 at 10:34 AM Luis Eduardo Pacheco <stratocat.iespana.es@...> wrote:
Hi Margie. 

I think you are looking for information on the two white objects that appeared that day in the city. 

The probable origin were two Thunderhead balloons of the three launched from Cumberland (Maryland) the previous day which crossed the US from east to west. 

The flight information I have is the following:

HBAL0289 - A27A9E - N259TH - Launch 18/06/2019 - 1:00 utc - Cumberland (MD) - Landed ~ 1:30 utc 25/6/2019 - 10 Miles SW of Cottonwood, California
HBAL0290 - A280AE - N260TH - Launch 18/06/2019 - 1:30 utc - Cumberland (MD) - Landed ~ 11:00 utc 26/6/2019 - Near Canby, California
HBAL0291 - A25CE6 - N251TH - Launch 18/06/2019 - 2:30 utc - Cumberland (MD) - Landed ~15:00 utc 25/6/2019 - 10 Miles NE of Paskenta, California 

If you have at MUFON a Flight Radar 24 Gold Account or Business Account (you must have one, believe me) with the numbers marked in red and the callsign (HBALXXXX) you will be able to reconstruct the flight path of the balloons to confirm the sighting. 

Hope this helps

Best regards

Luis E.Pacheco / Editor
lep@...

StratoCat - History and present of the use of stratospheric balloons in the fields of science, military and aerospace
https://stratocat.com.ar/indexe.html




El vie, 12 feb 2021 a las 12:58, Margie Kay (<momufonasd@...>) escribió:
Where can I find historical data for balloon launches?  Looking for June 20, 2019 over Kansas City, Missouri from 2 pm to 9 pm.

Thank you!

--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri
816-833-1602 (office)



--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri

OZ UFO Conference June 5-6, 2021​

816-833-1602 (office)


Re: Historical data

Luis Eduardo Pacheco
 

Hi Margie. 

I think you are looking for information on the two white objects that appeared that day in the city. 

The probable origin were two Thunderhead balloons of the three launched from Cumberland (Maryland) the previous day which crossed the US from east to west. 

The flight information I have is the following:

HBAL0289 - A27A9E - N259TH - Launch 18/06/2019 - 1:00 utc - Cumberland (MD) - Landed ~ 1:30 utc 25/6/2019 - 10 Miles SW of Cottonwood, California
HBAL0290 - A280AE - N260TH - Launch 18/06/2019 - 1:30 utc - Cumberland (MD) - Landed ~ 11:00 utc 26/6/2019 - Near Canby, California
HBAL0291 - A25CE6 - N251TH - Launch 18/06/2019 - 2:30 utc - Cumberland (MD) - Landed ~15:00 utc 25/6/2019 - 10 Miles NE of Paskenta, California 

If you have at MUFON a Flight Radar 24 Gold Account or Business Account (you must have one, believe me) with the numbers marked in red and the callsign (HBALXXXX) you will be able to reconstruct the flight path of the balloons to confirm the sighting. 

Hope this helps

Best regards

Luis E.Pacheco / Editor
lep@...

StratoCat - History and present of the use of stratospheric balloons in the fields of science, military and aerospace
https://stratocat.com.ar/indexe.html




El vie, 12 feb 2021 a las 12:58, Margie Kay (<momufonasd@...>) escribió:
Where can I find historical data for balloon launches?  Looking for June 20, 2019 over Kansas City, Missouri from 2 pm to 9 pm.

Thank you!

--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri
816-833-1602 (office)


Historical data

Margie Kay
 

Where can I find historical data for balloon launches?  Looking for June 20, 2019 over Kansas City, Missouri from 2 pm to 9 pm.

Thank you!

--
Margie Kay

Missouri MUFON Assistant State Director
Webmaster - Newsletter Editor - Education
Kansas City, Missouri
816-833-1602 (office)


Re: Needs some help in Nigeria

Ted Tagami
 

Thank you Chuck. That was a good idea!
We'll reach out to him.

/73

KK6UUQ

--
"A posse ad esse."

Ted Tagami
CEO & Co-founder
Magnitude.io

+1 510 684 9773

http://www.linkedin.com/in/tagami


Lawn chair Larry

Mark Garrett
 


Re: Needs some help in Nigeria

Chuck KG5CA
 

Ted,

I did a search on QRZ.com and found almost no hams in Nigeria.  One of the few that did turn up was Bert/WB6QCS who operates from there as 5N7RSB.  I suggest you look him up in the Callbook or QRZ, and email him.  They dont appear to have a lot of hams in Nigeria.
Best regards,
--
Chuck / KG5CA
StratoCasters


Needs some help in Nigeria

Ted Tagami
 

Does anyone know, or can anyone recommend a ham in Nigeria? I am working with a group to launch balloons around the world on the equinox for education. A group has reached out from Nigeria but they do not have a radio license. Any help or insight appreciated!

/73

--
"A posse ad esse."

Ted Tagami
CEO & Co-founder
Magnitude.io

+1 510 684 9773

http://www.linkedin.com/in/tagami


Re: Circuit boards for pico balloon trackers

John Maca
 

I've used JCLPCB, DirtyPCB, and SeeedStudio, all with good results.  I prefer the 0.6mm boards from JCLPCB but 0.8 from the others is OK too. 
One thing about JCLPCB is the smallest size stencil they have is still HUGE.  It's fine if you're doing panels of boards, but for single boards, you might look at OSH Stencils (www.oshstencils.com) as an alternative.  

John
AB5SS


Re: Circuit boards for pico balloon trackers

Bill Brown
 

JLCPCB was one of the board houses that Hackvana used. Mitch at HAckvana sent me that info when he closed his doors. I also have used PCBWay with great results but the boards are slightly heavier than JLCPCB...only about a quarter gram.  Very similar quality.  PCBWay will also do PCB Assembly as long as the parts can be purchased totally in China and they did a great job.

I've also used OSH Park but I think the thinnest board they can offer is 0.8mm (half thickness).

Be aware that Chinese New Year is fast approaching and manufacuring in China will come to a complete standstill fo 3 weeks or more so get your orders in soon.

- Bill WB8ELK


-----Original Message-----
From: Michael Hojnowski <kd2eat@...>
To: GPSL@groups.io
Sent: Sun, Jan 24, 2021 11:22 am
Subject: Re: [GPSL] Circuit boards for pico balloon trackers

I just ordered a stack of panels for my Wisp tracker from JLCPCB in 0.6mm thickness, the same as Bill/WB8ELK.  The turnaround was super-fast, and the boards were excellent quality.  I couldn't beat the price.  I ordered 10 panels of 3 boards each and it came to just under $30 delivered.  I'm looking forward to trying them.  I had ordered 0.8mm in the past from Hackvana, but they're out of business now.  I was able to give JLCPCB the same gerbers and got identical looking panels, on thinner boards.  I'm excited to fly one (or more!).

Mike/KD2EAT

On 1/24/2021 10:40 AM, greg@... wrote:
OSH Park is just $5/square inch for 3 copies.   Free USPS first class mail.  Price is hard to beat for small boards.  

Greg K7RKT

On Sun, Jan 24, 2021 at 1:29 AM Rodney Sparks <rodney@...> wrote:
I use PCBWay.com for all of my quick-turn PCBs.  A small batch of boards is $23 shipped, and the record so far for receiving boards from them is 69 hours from ordering until boards in hand.  Always good quality too.  Boards that aren't green and 1.6mm thick take a few days more though.

-Rodney


On Sat, Jan 23, 2021 at 8:31 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi Chuck,

 I get mine from JLCPCB in China.   Send them Gerber files and specify board thickness in mm.  You will receive high quality boards that are ultra-thin in just a bit over a week and they are inexpensive to boot. I order the 0.6mm boards which equates to  0.024 " thickness. You can go with 0.4mm boards as well but 0.6mm seemed to be the best compromise for strength vs thinness.

- Bill WB8ELK




-----Original Message-----
From: Chuck KG5CA <goldsmith@...>
To: GPSL@groups.io
Sent: Sat, Jan 23, 2021 5:22 pm
Subject: [GPSL] Circuit boards for pico balloon trackers

Question for those of you building ultra-small trackers for pico balloons:

What thickness of FR4 boards are you using, and where do you get them manufactured?
Many shops will build 0.0625" thick, but that seems unnecessarily thick and heavy.  What are good alternatives?

Thanks....


Re: Circuit boards for pico balloon trackers

Chuck KG5CA
 

Thanks for the advice and referrels.  Much appreciated.
--
Chuck / KG5CA
StratoCasters


Re: Circuit boards for pico balloon trackers

Pat
 

I can’t say that the flex PCB material is FR4 by a long shot.  DE Pat N8PK-FM19 


On Jan 24, 2021, at 12:22 PM, Michael Hojnowski <kd2eat@...> wrote:


I just ordered a stack of panels for my Wisp tracker from JLCPCB in 0.6mm thickness, the same as Bill/WB8ELK.  The turnaround was super-fast, and the boards were excellent quality.  I couldn't beat the price.  I ordered 10 panels of 3 boards each and it came to just under $30 delivered.  I'm looking forward to trying them.  I had ordered 0.8mm in the past from Hackvana, but they're out of business now.  I was able to give JLCPCB the same gerbers and got identical looking panels, on thinner boards.  I'm excited to fly one (or more!).

Mike/KD2EAT

On 1/24/2021 10:40 AM, greg@... wrote:
OSH Park is just $5/square inch for 3 copies.   Free USPS first class mail.  Price is hard to beat for small boards.  

Greg K7RKT

On Sun, Jan 24, 2021 at 1:29 AM Rodney Sparks <rodney@...> wrote:
I use PCBWay.com for all of my quick-turn PCBs.  A small batch of boards is $23 shipped, and the record so far for receiving boards from them is 69 hours from ordering until boards in hand.  Always good quality too.  Boards that aren't green and 1.6mm thick take a few days more though.

-Rodney


On Sat, Jan 23, 2021 at 8:31 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi Chuck,

 I get mine from JLCPCB in China.   Send them Gerber files and specify board thickness in mm.  You will receive high quality boards that are ultra-thin in just a bit over a week and they are inexpensive to boot. I order the 0.6mm boards which equates to  0.024 " thickness. You can go with 0.4mm boards as well but 0.6mm seemed to be the best compromise for strength vs thinness.

- Bill WB8ELK




-----Original Message-----
From: Chuck KG5CA <goldsmith@...>
To: GPSL@groups.io
Sent: Sat, Jan 23, 2021 5:22 pm
Subject: [GPSL] Circuit boards for pico balloon trackers

Question for those of you building ultra-small trackers for pico balloons:

What thickness of FR4 boards are you using, and where do you get them manufactured?
Many shops will build 0.0625" thick, but that seems unnecessarily thick and heavy.  What are good alternatives?

Thanks....


Re: Circuit boards for pico balloon trackers

Michael Hojnowski
 

I just ordered a stack of panels for my Wisp tracker from JLCPCB in 0.6mm thickness, the same as Bill/WB8ELK.  The turnaround was super-fast, and the boards were excellent quality.  I couldn't beat the price.  I ordered 10 panels of 3 boards each and it came to just under $30 delivered.  I'm looking forward to trying them.  I had ordered 0.8mm in the past from Hackvana, but they're out of business now.  I was able to give JLCPCB the same gerbers and got identical looking panels, on thinner boards.  I'm excited to fly one (or more!).

Mike/KD2EAT

On 1/24/2021 10:40 AM, greg@... wrote:
OSH Park is just $5/square inch for 3 copies.   Free USPS first class mail.  Price is hard to beat for small boards.  

Greg K7RKT

On Sun, Jan 24, 2021 at 1:29 AM Rodney Sparks <rodney@...> wrote:
I use PCBWay.com for all of my quick-turn PCBs.  A small batch of boards is $23 shipped, and the record so far for receiving boards from them is 69 hours from ordering until boards in hand.  Always good quality too.  Boards that aren't green and 1.6mm thick take a few days more though.

-Rodney


On Sat, Jan 23, 2021 at 8:31 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi Chuck,

 I get mine from JLCPCB in China.   Send them Gerber files and specify board thickness in mm.  You will receive high quality boards that are ultra-thin in just a bit over a week and they are inexpensive to boot. I order the 0.6mm boards which equates to  0.024 " thickness. You can go with 0.4mm boards as well but 0.6mm seemed to be the best compromise for strength vs thinness.

- Bill WB8ELK




-----Original Message-----
From: Chuck KG5CA <goldsmith@...>
To: GPSL@groups.io
Sent: Sat, Jan 23, 2021 5:22 pm
Subject: [GPSL] Circuit boards for pico balloon trackers

Question for those of you building ultra-small trackers for pico balloons:

What thickness of FR4 boards are you using, and where do you get them manufactured?
Many shops will build 0.0625" thick, but that seems unnecessarily thick and heavy.  What are good alternatives?

Thanks....


Re: Circuit boards for pico balloon trackers

greg@bigredbee.com
 

OSH Park is just $5/square inch for 3 copies.   Free USPS first class mail.  Price is hard to beat for small boards.  

Greg K7RKT

On Sun, Jan 24, 2021 at 1:29 AM Rodney Sparks <rodney@...> wrote:
I use PCBWay.com for all of my quick-turn PCBs.  A small batch of boards is $23 shipped, and the record so far for receiving boards from them is 69 hours from ordering until boards in hand.  Always good quality too.  Boards that aren't green and 1.6mm thick take a few days more though.

-Rodney


On Sat, Jan 23, 2021 at 8:31 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi Chuck,

 I get mine from JLCPCB in China.   Send them Gerber files and specify board thickness in mm.  You will receive high quality boards that are ultra-thin in just a bit over a week and they are inexpensive to boot. I order the 0.6mm boards which equates to  0.024 " thickness. You can go with 0.4mm boards as well but 0.6mm seemed to be the best compromise for strength vs thinness.

- Bill WB8ELK




-----Original Message-----
From: Chuck KG5CA <goldsmith@...>
To: GPSL@groups.io
Sent: Sat, Jan 23, 2021 5:22 pm
Subject: [GPSL] Circuit boards for pico balloon trackers

Question for those of you building ultra-small trackers for pico balloons:

What thickness of FR4 boards are you using, and where do you get them manufactured?
Many shops will build 0.0625" thick, but that seems unnecessarily thick and heavy.  What are good alternatives?

Thanks....


Re: Circuit boards for pico balloon trackers

Rodney Sparks
 

I use PCBWay.com for all of my quick-turn PCBs.  A small batch of boards is $23 shipped, and the record so far for receiving boards from them is 69 hours from ordering until boards in hand.  Always good quality too.  Boards that aren't green and 1.6mm thick take a few days more though.

-Rodney


On Sat, Jan 23, 2021 at 8:31 PM Bill Brown via groups.io <wb8elk=aol.com@groups.io> wrote:
Hi Chuck,

 I get mine from JLCPCB in China.   Send them Gerber files and specify board thickness in mm.  You will receive high quality boards that are ultra-thin in just a bit over a week and they are inexpensive to boot. I order the 0.6mm boards which equates to  0.024 " thickness. You can go with 0.4mm boards as well but 0.6mm seemed to be the best compromise for strength vs thinness.

- Bill WB8ELK




-----Original Message-----
From: Chuck KG5CA <goldsmith@...>
To: GPSL@groups.io
Sent: Sat, Jan 23, 2021 5:22 pm
Subject: [GPSL] Circuit boards for pico balloon trackers

Question for those of you building ultra-small trackers for pico balloons:

What thickness of FR4 boards are you using, and where do you get them manufactured?
Many shops will build 0.0625" thick, but that seems unnecessarily thick and heavy.  What are good alternatives?

Thanks....


Re: Circuit boards for pico balloon trackers

Bill Brown
 

Hi Chuck,

 I get mine from JLCPCB in China.   Send them Gerber files and specify board thickness in mm.  You will receive high quality boards that are ultra-thin in just a bit over a week and they are inexpensive to boot. I order the 0.6mm boards which equates to  0.024 " thickness. You can go with 0.4mm boards as well but 0.6mm seemed to be the best compromise for strength vs thinness.

- Bill WB8ELK




-----Original Message-----
From: Chuck KG5CA <goldsmith@...>
To: GPSL@groups.io
Sent: Sat, Jan 23, 2021 5:22 pm
Subject: [GPSL] Circuit boards for pico balloon trackers

Question for those of you building ultra-small trackers for pico balloons:

What thickness of FR4 boards are you using, and where do you get them manufactured?
Many shops will build 0.0625" thick, but that seems unnecessarily thick and heavy.  What are good alternatives?

Thanks....


Re: Circuit boards for pico balloon trackers

Chuck KG5CA
 

On Sat, Jan 23, 2021 at 03:24 PM, greg@... wrote:
Oshpark.com
Greg,
Thanks for the referral.  I see they also manufacture 4mil thick polyimide boards.  Might be even lighter.... :-)
--
Chuck / KG5CA
StratoCasters


Re: Google's Loon project coming to an end

Christopher Rose
 

It did sound fantastic



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: James Ewen VE6SRV <ve6srv@...>
Date: 1/23/21 12:28 PM (GMT-05:00)
To: GPSL@groups.io
Subject: Re: [GPSL] Google's Loon project coming to an end

That would be people reporting not understanding the terms. The payload wouldn’t have been the size of a tennis court. Even the envelope at launch wouldn’t really be that size. 

Take a look at the “auto-launcher” photos. 

A tennis court sized payload with any amount of equipment on it would probably be fairly significant mass. That would require a lift envelope the size of a battleship. 

Imagine that landing on your house, or across a roadway. Definitely needs to have a controlled landing in an area with lots of room to land. 

James
VE6SRV 

On Sat, Jan 23, 2021 at 10:18 AM Christopher Rose <kb8uih88@...> wrote:
Hi, If the payload was as big as a tennis court, how big is the envelope(s)?

-----------------------------------------

From: "Mark Conner N9XTN"
To: GPSL@groups.io
Cc:
Sent: Thursday January 21 2021 7:58:33PM
Subject: [GPSL] Google's Loon project coming to an end


Cost wasn't sustainable.

73 de Mark N9XTN


Virus-free. www.avg.com

--
James
VE6SRV

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