Tag Archives: Satellite

A Portable Satellite Station Part 1 – A Simple Station for AO-85

Our club has quite a few members who are interested in space communications. We decided to build a simple portable satellite station last year for our 2016 Field Day operation to learn about satellite communications and to create something new for folks to work with during 2016 Field Day.

Simple Portable Satellite Station
Simple Portable Satellite Station

Our 1.0 Portable Satellite Station was a relatively simple setup built around an HT, an Elk 2m/70cm satellite antenna, and some gear to improve the receive performance and transmit power output of the HT. All of the gear was mounted on a board to make it easy to transport and it is powered by a LIPO rechargeable battery. The gear in our 1.0 station is made up of the following:

Improved Portable Satellite Station Antenna Support
Improved Satellite Antenna Support

Our first contacts with our 1.0 station were made using the Elk Antenna hand-held. Later, we created a “plumber’s special” setup with a camera tripod to make pointing the antenna easier. Note the angle meter from a local hardware store which measures the elevation angle of the antenna.

AO-85 (Fox-1A) U/V Mode FM Cube Satellite
AO-85 (Fox-1A) U/V Mode FM Cube Satellite

This setup worked great for making FM contacts through AO-85 (Fox-1A), a  U/V mode FM EasySat. We used the 1.0 station on multiple occasions including Field Day 2016 and several of our club members used it to make their first satellite contacts. The Full-Duplex HT allowed us to hear our own signal coming back from the satellite which was an important tool to help with aiming the antenna properly. The ELK Dual-Band antenna is also a good choice because it uses a single feed point and a single polarization for both the 2m and 70cm bands.

Portable Satellite Station Team Operating Approach
1.0 Station Team Operating Approach

We used the team operating approach outlined above. This worked especially well for new folks who had not made a satellite contact before as it enabled each of the three team members involved in making the contact to focus on a specific part of the contact. We used orange plastic tent stakes to make AOS, Time of Closest Approach, and EOS to mark headings for each satellite pass. Small flashlights used at the stakes made them glow for night-time passes.

We certainly had a lot of fun with our 1.0 Satellite Station and I expect that we’ll continue to use it. As we gained a little experience with AO-85, we decided that we wanted to build a more capable Portable Satellite Station which we could use to operate with linear transponder satellites and which included a tracking system and better antennas. I know from experience with our home satellite station that DX contacts are possible using higher altitude linear transponder satellites like FO-29.

We would also like to be able to use APRS and other digital modes through satellites as well as receive SSTV pictures from space.

These goals have become the basis for building our Portable Satellite Station 2.0. More on the new station in Part 2 of this series. Other articles in the series include:

You may also be interested in the satellite station at our home QTH. You can read more about that here.

73,

Fred (AB1OC)

Why Ham Radio?

Why Ham Radio - Fred's Truck Antenna
Fred’s Truck Antenna

Sometimes I drive Fred’s truck into work and people ask me what that big antenna on the back of the truck is for. I explain to them that it is for Ham Radio.  But the reply is usually “Why ham radio?”  Isn’t that outdated technology?  We have cell phones and IM, etc…what do we need Ham Radio for?  Here are my thoughts as a relatively new Ham about why I enjoy spending much of my time with Ham Radio.

Why Ham Radio - Amateur Radio for Public Service
Amateur Radio for Public Service

Public Service

The number one reason we still need Ham Radio along with all the other technology is for public service.  When there is a disaster and cell phones, television, … are all not working, Ham Radio operators provide critical communication.

Ham Radio operators help locally to keep hospitals and first responders in contact with each other to help those affected by the disaster.

We also use our ability to communicate around the world to help family members to get in touch with loved ones affected by a disaster.

Ham Radio operators have been on the scene helping in every disaster from the earthquakes in Nepal to the recent flooding in California.

Why Ham Radio - Amateur Radio Cube Satellites
Amateur Radio Cube Satellites

Technology and the Maker Movement

I only became a Ham 5 years ago but many of my fellow Ham Radio operators got their license when they were in their early teens. Some have used what they learned to launch their careers. Many have had successful careers in STEM fields, all launched by their interest in Ham Radio at a young age.  As technology advances so does the technology used in our hobby.   We even have a Nobel laureate, Joe Taylor K1JT who is a ham. Joe has developed weak signal digital communication modes that let us communicate by bouncing signals off the moon!

As technology has advanced, so has the use of it in Ham Radio.   Most Ham Radio operators have one or more computers in their shack.  Many also have a software designed radio (SDR), where much of the radio functionality is implemented using Software. Hams use sound cards to run digital modes, which are a lot like texting over the radio. We use the internet extensively as part of operating.  We can also make contacts through satellites orbiting the earth and even the International Space Station.

Homebrewing

Most hams love do-it-yourself technical projects – building a station, home brewing an antenna, building a radio or other station component.  In my day job, I am a program manager for software development projects.  It has been a while since I have built anything myself.  As a Ham, I taught myself how to code in Python and about the Raspberry Pi and I built the DX Alarm Clock.

Why Ham Radio - QSL Card from VK6LC in Western Australia
QSL Card from VK6LC in Western Australia

International Camaraderie

One of the coolest things about being an amateur radio operator is that you can communicate with other hams all over the world. Ham Radio is an international community where we all have something in common to talk about.  That is our stations and why we enjoy ham radio.    The QSL card above is from a memorable QSO with Mal, VK6LC, from Western Australia, who was the last contact that I needed for a Worked All Zones award.  I must have talked to him for 1/2 hour about his town in Australia and his pet kangaroos!

Why Ham Radio - Amateur Radio Map of the World
Amateur Radio Map of the World

Geography Lesson

I have learned much about geography from being on the air and trying to contact as many countries as I can.  There are 339 DX Entities, which are countries or other geographical entities.  I have learned where each one is in order to understand where propagation will allow me to make a contact.  I have learned a great deal about world geography. Through exchanging QSL cards often get to see photos from so many areas of the world.

Why Ham Radio - DXCC Challenge Award Plaque
DXCC Challenge Award Plaque

Achievement – DXing and Contesting

DXing and Contesting provide a sense of achievement and exciting opportunity for competition. Many Hams work toward operating awards. You can get an operating award for contacting all 50 states or contacting 100 or more countries.  There are also awards for contacting Islands, cities in Japan, countries in Asia, or anything else you can imagine.  Each of these operating awards provides a sense of accomplishment and helps to build skills.  Contesting builds skills through competition among Hams to see who can make the most contacts with the most places in 24 or 48 hours. Contesting also improves our operating skills and teaches us to copy callsigns and additional data accurately.

Why Ham Radio - Teaching a License Class
Teaching a License Class

Teaching Licensing Classes – Passing it On

Recently I joined a team of club members who teach license classes to others who want to get licensed or upgrade their existing licenses.  Teaching provides a way to improve my presentation skills. It also helps me to really understand the material that we teach about Amateur Radio.  It is a thrill at the end of the class to see many people earn their licenses or upgrades.

There are so many interesting aspects of Ham Radio which are what makes it such a great hobby.  Getting your license can open up a world of possibilities.  Upgrading to a new license class provides more opportunities to communicate over longer distances.  Our club provides many resources to help you get your first license, upgrade to a new license class, and learn about the many aspects of our hobby.

Anita, AB1QB

First Amateur Radio Satellite in Geosynchronous Orbit in 2017?

Researchers at the Ted and Karyn Hume Center for National Security and Technology are preparing to send an amateur radio satellite into a geosynchronous orbit in 2017.

This will be a great opportunity for Amateur Radio satellite operators! Some preliminary information about this satellite may be found here.

The proposed frequency plan for the spacecraft is:
Uplinks: 5655-5665 MHz
Downlinks: 10455-10465 MHz

The amateur radio payload will comprise a Software Defined Transponder capable of supporting many different modes, including analog SSB.

 

Geosynchronous Amateur Radio Satellite Possible Orbit

Possible coverage of a Geosynchronous satellite at 74 degrees West – Credit NX5R

 

 

 

 

This satellite’s high altitude will create a very large coverage footprint. Also, see the following article on the ARRL website for more information.

According to AMSAT Vice President-Operations Drew Glasbrenner, KO4MA, the satellite’s potential footprint would extend over the US from the Mid-Pacific to Africa.

Source: First amateur radio in geosynchronous orbit will aid disaster communications

Radio Amateurs Developing Skills Worldwide