Category Archives: Space

Articles and other information related to Space Communications using Satellites, High-Altitude Balloons, Earth-Moon-Earth (EME), etc.

Hudson Memorial School Preparations for the ARISS Contact

Things are now moving full speed as ahead as we quickly close in on our Amateur Radio contact with the International Space Station.  While preparing for this contact began over a year ago the rush is now on to complete the last pieces required to create a successful contact.  Teachers and students from grades 5 – 8 are working through space and radio curriculum applications, preparing questions for the astronauts, and excitedly waiting to hear about our official ISS contact time.

Preparation for the contact began over a year ago with the ARISS application process.  This is the process which brought my school and me into the amazing world of Amateur Radio.  The application asked us to prove that we provided several opportunities for our students to access curriculum centered around the concepts of radio and space sciences.  In our application, I was able to include that our 6th-grade science curriculum covered space, our 8th-grade science curriculum covered radio communications, we annually hold an Astronomy and STEM night for all students, and our 7th-grade team already provided a skype contact with a NASA Engineer after their Science Fiction unit.  We have since included new opportunities for students to access space and radio sciences by participating in a High Altitude Balloon launch, planting seeds that were brought to the International Space Station, visiting the Boston Museum of Science for the special exhibit on space and the international space station, building rovers and participating in an egg drop, having our pre-engineering program work on solutions for the ISS, and building amateur radio into our annual STEM nights.

One of the best parts of working toward this contact has been the relationship that has been forged with the Nashua Area Radio Society.  The application suggested that we reach out and partner with a local radio club.  I believe we lucked out being located just across the bridge from NARS and that there are so many members dedicated to helping students discover Amateur Radio.  Without this relationship, this contact would never have been possible.  This relationship provided us with the ability to expose students to Amateur Radio through a comprehensive curriculum with the High-Altitude Balloon Launch, chances for students to get on the air at our annual STEM night and through our hosting of their ARRL Field Day activities.  We have also been able to work to provide student amateur radio licensing in our first school licensing course and our new school radio club.

In just the past few weeks preparation has accelerated as we near our possible contact dates.  Students and teachers from the 5th through 8th grade worked on questions to ask the astronauts.  Staff was provided with previously asked questions and links to NASA and ISS research.  In just a few short weeks questions rolled in from the students at all levels.  Teachers that teach ELA, Social Studies, Math, Science, PLTW, and 5th grade were invested in helping students developing thoughtful questions.  In the end, we had a stack of over 300 questions to chose from.  Students questions ranged from inquiries about science experiments to how the ISS provides clean air for the astronauts to breath.  It was an incredibly difficult process to narrow down the questions to twenty-three and then to select the fourteen students that would ask questions.  One might ask why we only went with fourteen students.  The answer is simply that with a ten-minute contact window, we wanted to make sure that every student asking questions would get a chance to talk to the astronauts before the end of the contact.  While there are twenty-three prepared questions that include entries from other anonymous students, we wanted to make sure every direct participant had this once in a lifetime experience and did not get left out because the pass ends before they asked their question.

Along with questions, we have had to provide a story about our local school to the ARISS people as a bio of our school population.  We are working now on a media press release that will be sent to WMUR, Hudson Cable Television, the Nashua Telegraph, and the Hudson Litchfield News as soon as we have our final contact date.  We are working with the students that are selected to go over how to ask their questions, what the set-up will look like on the day of the contact, and how close to the microphone they need to be to make sure their question is heard.  We are also working on how and what additional programming we will present to the school during the week of the contact and during the thirty minutes before the preparation.

It still amazes me how much our staff and students have learned about amateur radio and the ISS in just one year.  I know that I myself have grown immensely in my knowledge and understanding of a hobby and interest that I knew nothing about just two summers ago.  My one hope for my students after this contact is that we inspire more students to take an interest in science, space, the ISS, and amateur radio.   Who knows, maybe someday we will be contacting someone in space who sat in our auditorium during our ARISS contact.

A sincere thank you to everyone at the school and members of the Nashua Area Radio Society that are working so hard to make sure that our students get to experience this once in a lifetime event.  Your efforts are noticed and greatly appreciated.

Dan, AC1EN

ISS Crew Contact Part 1 – Ground Station Design and Construction

Our planned ISS Crew Contact is almost here! It will take place sometime during the first week of December (December 3rd – 8th) and we are busy finalizing our Ground Station and preparing for our contact. The link below is the first in a series of articles that are planned to describe steps in this project and the actual contact experience. The first article explains the Design, Construction, and Testing of the two Ground Stations that are required as well as plans for connecting them to the Audio-Video and Data systems at the school.

Source: ISS Crew Contact Part 1 – Ground Station Design and Construction

Fred, AB1OC

HAB-4 Launch Preparations

We are again working with Hudson Memorial School on a High-Altitude Balloon (HAB) Project. Dan Pooler, AC1EN and Adam Goldstein, KC1KBZ have completed most of the classroom instruction in preparation for a HAB-4 launch and we are now looking for a suitable set of conditions to launch! We have begun final HAB launch prep which includes some modifications to the flight platform to improve its cold temperature performance.

HAB-1 In Flight
Our HAB In Flight

We’ve established a set of windows for a possible launch of HAB-4 as follows:

  • Oct 20 or Oct 21 (Sat or Sun) – this coming weekend
  • Oct 27 or Oct 28 (Sat or Sun)
  • Nov 10 or Nov 11 (Sat or Sun)

We’ve also begun the final preparations for HAB-4’s launch

HAB Launch Prep

We’ve had some problems with very cold temperatures stopping our GoPro video cameras on the HAB during HAB-2 and HAB-3’s flights.

HAB-2 Temperature Data - HAB Launch Prep
HAB-2 Temperature Data

We saw temperatures of -60° F and lower during our last two flights. The cameras will function to about -40°F so we need an insulation and heating system that can keep the cameras warmer than this for the 30 to 45 minutes when the coldest temperatures are present.

HAB Camera Insulation and Heating System - HAB Launch Prep
HAB Camera Insulation and Heating System

We’ve come up with a simple insulating and heating system for our cameras in an attempt to mitigate the cold temperature problems. Our approach is to attach a small hand warmer to the back of each camera and then insulate them to keep the heat from the warmers and the camera batteries in the camera case. We’ve also moved to sealed camera cases which should help to keep the heat inside the assembly. Our solution is lightweight and only adds about 25 grams to the weight of each camera.

With these modifications in place, we’ve carefully weighed all of the components of the HAB and determined that the launch weight for HAB-4 will be 930 grams.

Balloon Performance Parameters

With the final weight of HAB-4 established, we can use a Balloon Performance Calculator to determine the ascent time and burst altitude for HAB-4.

HAB-4 Balloon Performance Results
HAB-4 Balloon Performance Results

We need to hold the ascent time to under 110 mins to ensure that the GoPro camera batteries on the HAB have enough capacity to operate the cameras throughout the flight. With a positive lift of 1,150 grams, HAB-4 should reach an altitude of 33,420 meters (approx. 109,600 ft) and the ascent should last a little under the target 110 minutes.

Flight Path Predictions

We typically launch from the Elementary School in Winchester, NH which is in the western part of the state.

HAB-2 Launch Site in Winchester NH
HAB Launch Site in Winchester NH

Winchester is far enough west of the coastline to keep the HAB from landing the ocean when Jetstream winds are quiet to moderate.

Current HAB-4 Flight Path Prediction for Sunday, October 21st
Current HAB-4 Flight Path Prediction for Sunday, October 21st

We use on an online HAB flight path prediction tool which takes Jetstream and ground weather forecasts into account and uses our HAB’s flight parameters to predict our HAB’s flight path. The Jetstream forecasts are not very accurate until a few days before the launch so we need run daily path predictions for about a week before a possible launch date to see whether we can launch on a given date. As you can see from the above prediction, we are not yet in a position to launch this coming Sunday but the forecasts are improving.

Testing the Flight Platform

The final steps in launch preparation are to test the electronics on the HAB’s flight platform to ensure that everything is working, clear the Camera and Flight Computer SD memory cards, and charge/replace all of the batteries.

Flight Platform Final Assembly and Test
HAB Flight PlatformTest

These steps are currently underway. When these steps are complete and we have favorable Jetstream and ground weather conditions, we’ll be ready to launch

We will continue to post updates as we countdown to the HAB-4 launch. All members and friends of the Nashua Area Radio Society at invited to attend the launch and everyone can track the HAB using aprs.fi as it flies.

Fred, AB1OC

Radio Amateurs Developing Skills Worldwide