How to Make Contact With the International Space Station Using Ham Radio

How to Make Contact With the International Space Station Using Ham Radio

Intoduction - Making Contact With the International Space Station

Have you ever dreamed of chatting with astronauts on the International Space Station? As a ham radio operator, you can make that dream a reality!

The ISS has amateur radio equipment that lets hams around the world make contact. All you need is some basic gear, know-how, and patience to have a QSO hundreds of miles above Earth.

In this guide, we'll walk you through everything you need to know to point your antenna at the skies and say hello to the crew. You'll learn the frequencies and modes used on the ISS, when you can expect passes overhead, and how to track the station. We'll also give tips on making that coveted first contact and having a successful chat about life in space.

Strap in and get ready to reach for the stars!

What Is Ham Radio and How Does It Work?

Ham radio, also known as amateur radio, is a fun hobby that allows you to communicate with people all over the world. To get started, you need a license to operate on certain radio frequencies. Once licensed, you can chat with fellow ham radio operators, participate in contests, assist during emergencies, and even talk with astronauts on the International Space Station!

How Do I Get Licensed?

To earn your ham radio license, you have to pass an exam to demonstrate your knowledge of radio operation and regulations. To prepare, you will need to study and pass an exam. For more details oh how to get a ham radio license in the UK check out our related blog here.

What Equipment Do I Need?

The basic gear includes a radio transceiver, an antenna, coaxial feedline cable, and a power supply. For beginners, a handheld transceiver like the Baofeng UV-5R is very affordable and will get you on the air right away. You can always upgrade to a more powerful mobile or base station transceiver later.

Who Can I Contact?

Once you have your license and equipment, you can start making contacts! Tune around and listen for conversations between other hams. When you find someone with a strong signal, politely interrupt, say your call sign, and ask if they'd like to chat. You can talk to people across town, across the country, and even on the International Space Station! Speaking with astronauts as they orbit above is a thrill only ham radio can provide.

With some study and patience in earning your license, ham radio can open up a world of discovery. Chatting with people from all walks of life, sometimes in far-off places, makes ham radio an endlessly fascinating hobby. Why not give it a try? The space station is calling!

Ham Radio on the International Space Station (ISS)

Have you ever wanted to talk to an astronaut in space? Believe it or not, you actually can through ham radio.

The ISS has special radio equipment that allows astronauts to communicate with amateur radio operators on Earth. To access this unique opportunity, you'll need a valid amateur radio license and some basic equipment to get started.Once you have your license and radio, you can try contacting the ISS during scheduled "contact windows" when astronauts have time set aside specifically for radio communication.

The best way to find out the contact schedule is to visit, the official website for Amateur Radio on the International Space Station. There you can see when passes will occur over your area and what frequencies will be used.

When a pass is about to happen over your location, power up your radio equipment and tune to the correct frequency.

You may hear some static at first, but once the ISS comes into range, the signal should come through loud and clear. The astronaut will announce they are open for calls and you can try giving them a shout to see if they respond. If they do, just speak normally - there's no need to yell! Let them know your name, location, and that you're excited to chat.

The conversations typically only last a few minutes as the ISS quickly passes overhead. But in that short time, you'll have a chance to ask the astronauts questions about life in space and what it's like to live and work on the station. For many hams and kids, it's an unforgettable thrill to make that initial contact and discover you're really speaking to an astronaut orbiting hundreds of miles above Earth. What an amazing opportunity technology has enabled, all thanks to amateur radio.

The Amateur Radio on the International Space Station (ARISS) Program

As an amateur radio operator, the ultimate thrill is making contact with an astronaut aboard the International Space Station (ISS). Through the ARISS program, you have the opportunity to chat with crew members living and working in space. ARISS is a cooperative venture by international amateur radio organizations and space agencies including NASA and Roscosmos.

How it Works

ARISS lets students and ham radio operators around the world experience the excitement of talking with crew members on the ISS. Contacts are made via amateur radio, so you'll need proper equipment like a transceiver, antenna, and license to participate. ARISS uses amateur radio frequencies and equipment already on board the ISS.

When the ISS passes over your area, you can try contacting the astronauts. A successful contact window lasts just a few minutes as the ISS speeds by at 17,500 mph! You'll exchange call signs, names, and locations with the astronauts, who may share details about life in space and describe views from the station's windows. For students, it's a chance to learn about space exploration and inspire interest in science, technology, engineering and math.

Get Involved

To get started, check the ARISS website for the next scheduled contact opportunity in your area. You'll need to register your school or radio club in advance. When the contact window opens, be ready to key your mic and call: “NA1SS, this is [your call sign], do you copy?” If you're lucky, you'll hear a response from an astronaut!

Even if you miss making contact, you can still tune in to ARISS radio operations and listen to other hams chatting with the ISS crew. Hearing those voices from space for the first time is a thrill like no other. By joining the ARISS community, you become part of an international effort to foster interest in human spaceflight, learning and exploration.

How to Speak With Astronauts on the ISS Using Ham Radio

Find the Next ISS Pass

The ISS orbits Earth about every 90 minutes, so its radio range is constantly changing. You need to know when the ISS will pass over your location next. Websites like and offer ISS pass predictions for your location. About 10-15 minutes before the start of a pass, power on your radio equipment.

Tune to the Right Frequency

The ISS operates in the VHF and UHF amateur radio bands. The most commonly used frequencies are 145.800 MHz for voice contacts and 437.800 MHz for packet radio contacts. Tune your radio to the correct frequency to have the best chance of hearing the ISS and making contact.

Listen for the ISS ss the ISS comes into range, start listening for radio signals on the frequency you selected. Due to the ISS’s high speed, the radio signal will quickly fade in and out. The best chances for hearing the ISS are when it’s directly overhead or close to overhead in your location. The ISS call sign is NA1SS.

Make Contact

If you hear NA1SS, wait for the astronaut to stop transmitting, then quickly send your call sign and name using the phonetics alphabet. For example, “NA1SS this is Whiskey-Hotel-India-Tango-Echo, William, over.” The astronaut may not respond directly to you, but keep listening—they may call for any station to contact them. Be ready to share details like your name, location, and a quick message. Keep your transmission under 10 seconds.

Making contact with the ISS is a challenging but rewarding experience for any amateur radio operator. With the right equipment and preparation, you'll have a shot at this thrilling opportunity.

Ham Radio FAQs: Your Top Questions About Contacting the ISS Answered

Have you ever wondered what it’s like to chat with an astronaut in space? Amateur radio operators around the world regularly make contact with crew members on the International Space Station (ISS) using ham radios. If you have a ham radio license, you can join in on the fun. Here are answers to some of the most common questions about contacting the ISS.

What equipment do I need?

To contact the ISS, you’ll need a VHF/UHF dual-band handheld transceiver that can transmit and receive on 2 meter and 70 cm bands. You’ll also want an antenna that provides wide coverage, like an omnidirectional base antenna. Some recommended transceivers for ISS contacts include the Yaesu FTM-400XDR, Icom IC-2730A, and Kenwood TH-D74A.

When is the ISS in range?

The ISS orbits about 248 miles above Earth and travels at around 17,150 miles per hour. This means its range for radio contact is constantly changing. You can check websites like or to find out when the ISS will be visible from your location and in range for radio contact. Timeframes are often less than 10 minutes, so you have to be ready to go on the fly!

What do I say?

Once you’ve established contact with the ISS, the conversation will likely be brief given the limited time. Have a few questions ready, like asking the crew about life in space or what they’re currently doing. You can also share details about your location and amateur radio club. The key is to keep things light and avoid controversial topics. And remember, there may be a delay of a few seconds between transmissions due to the time it takes for signals to travel to and from space.

Do I have a chance of getting through?

With many amateur radio operators vying for a chance to chat with the ISS, the odds of successfully making contact can be low. But don’t get discouraged! Timing, using the proper equipment, positioning your antenna for the best coverage, and a little bit of luck all play a role. If at first you don’t succeed, try again during the next pass. Making a real contact with astronauts in space can be a thrilling experience, so keep at it.


So there you have it, a quick guide to making contact with the ISS using your ham radio. Pretty cool that we earthlings can chat it up with astronauts zooming around in space, right? Just takes some know-how and the right equipment.

If you give it a shot, let us know how it goes. Getting to say you spoke to someone in space is a special experience.

Good luck and 73 from all of us here at Moonraker.