Date   

Re: This year's meeting.

L. Paul Verhage KD4STH
 

I agree, thank you.


On Tue, Mar 2, 2021, 7:24 PM Michael Hojnowski <kd2eat@...> wrote:
If we do end up having an in-person GPSL, I do hope we livestream it again anyway.  I'm sure there will be participants who can't or don't feel comfortable traveling.  I'm willing to contribute some effort to make that happen.  My University Zoom account with a 300 participant cap remains available.  I'm also totally game to help if we choose a different solution.  I just think the livestream is technology that should be here to stay.

Mike / KD2EAT

On 3/2/2021 6:18 PM, Jerry via groups.io wrote:
Starting to think about this year's GPSL.  Any thoughts yet on if it will be an in person meeting?  I believe this year was planned for Spaceport Indiana.



Re: This year's meeting.

Jules Hojnowski
 

I would love a zoom, but would also love to go to this one :)

Jules/ kd2fou


From: GPSL@groups.io <GPSL@groups.io> on behalf of Michael Hojnowski <kd2eat@...>
Sent: Tuesday, March 2, 2021 9:24:15 PM
To: GPSL@groups.io <GPSL@groups.io>
Subject: Re: [GPSL] This year's meeting.
 
If we do end up having an in-person GPSL, I do hope we livestream it again anyway.  I'm sure there will be participants who can't or don't feel comfortable traveling.  I'm willing to contribute some effort to make that happen.  My University Zoom account with a 300 participant cap remains available.  I'm also totally game to help if we choose a different solution.  I just think the livestream is technology that should be here to stay.

Mike / KD2EAT

On 3/2/2021 6:18 PM, Jerry via groups.io wrote:
Starting to think about this year's GPSL.  Any thoughts yet on if it will be an in person meeting?  I believe this year was planned for Spaceport Indiana.



Re: This year's meeting.

Michael Hojnowski
 

If we do end up having an in-person GPSL, I do hope we livestream it again anyway.  I'm sure there will be participants who can't or don't feel comfortable traveling.  I'm willing to contribute some effort to make that happen.  My University Zoom account with a 300 participant cap remains available.  I'm also totally game to help if we choose a different solution.  I just think the livestream is technology that should be here to stay.

Mike / KD2EAT

On 3/2/2021 6:18 PM, Jerry via groups.io wrote:
Starting to think about this year's GPSL.  Any thoughts yet on if it will be an in person meeting?  I believe this year was planned for Spaceport Indiana.



Re: This year's meeting.

Zack Clobes W0ZC
 

There have been some dates thrown around for a July meeting, but nothing confirmed.

Zack

On Tue, Mar 2, 2021, 5:18 PM Jerry via groups.io <jerrygable=yahoo.com@groups.io> wrote:
Starting to think about this year's GPSL.  Any thoughts yet on if it will be an in person meeting?  I believe this year was planned for Spaceport Indiana.

With more of us getting the Covid shot in person might be a possibility this year.  June might be a little early but is an Aug/Sept timeframe more doable.

If not in person, any thoughts on an alternative launch?

Jerry Gable
Balloon Flight Prediction tools
http://www.s3research.com


This year's meeting.

Jerry
 

Starting to think about this year's GPSL.  Any thoughts yet on if it will be an in person meeting?  I believe this year was planned for Spaceport Indiana.

With more of us getting the Covid shot in person might be a possibility this year.  June might be a little early but is an Aug/Sept timeframe more doable.

If not in person, any thoughts on an alternative launch?

Jerry Gable
Balloon Flight Prediction tools
http://www.s3research.com


Re: Life in the Stratosphere question

L. Paul Verhage KD4STH
 

I feel the funnel idea would make better sense. A fan and funnel wouls both issues with sterility, so no difference there. 

The funnel is passive and could be made larger, if necessary. Perhaps a sheet of Styrofoam could be placed over the funnel opening to keep it clean on the ground. Once the balloon is high enough, then it could be opened.

On Sun, Feb 28, 2021, 11:13 AM Larry <larry.phegley@...> wrote:
The papers we have  read from others who have attempted this  have all used air pumps to draw air over a filter.  I had purchased a computer fan rated to draw 120 CFM through the system.  Our system is constrained to 1/4 inch diameter tubing because of the diameter of the solenoid valves that seal the system until we get up there  

So my compatriots are now thinking of a funnel vice a fan and orienting the flow vertically vice horizontally in the payload.  

If my calculations are correct ( I need to double check them)  a funnel that was 4 inches at the wide end might produce in the  ball park of 120 CFM of stratospheric air dropping through the stratosphere.  Videos I have watched after PBC the payload seems to maintain a relatively straight orientation rocking back and forth some.  

There might be some problems keeping the funnel sterile but other than that, is this idea worth putting some thought into?

Larry
KJ6PBS


Life in the Stratosphere question

Larry
 

The papers we have  read from others who have attempted this  have all used air pumps to draw air over a filter.  I had purchased a computer fan rated to draw 120 CFM through the system.  Our system is constrained to 1/4 inch diameter tubing because of the diameter of the solenoid valves that seal the system until we get up there  

So my compatriots are now thinking of a funnel vice a fan and orienting the flow vertically vice horizontally in the payload.  

If my calculations are correct ( I need to double check them)  a funnel that was 4 inches at the wide end might produce in the  ball park of 120 CFM of stratospheric air dropping through the stratosphere.  Videos I have watched after PBC the payload seems to maintain a relatively straight orientation rocking back and forth some.  

There might be some problems keeping the funnel sterile but other than that, is this idea worth putting some thought into?

Larry
KJ6PBS


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

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