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hi everyone i'm tim peake and welcome

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aboard the international space station

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where we're orbiting earth 16 times

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every day

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one of the most rewarding activities

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that some astronauts undertake on orbit

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is to talk to schools using the space

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station's ham radio

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now these are events that are planned by

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aris which is a worldwide group of

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amateur radio volunteers who are

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dedicated to introducing young people

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and students to science technology

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engineering and mathematics

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now this is the equipment here in the

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columbus laboratory which consists of a

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handheld radio

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a headset

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and we also have a ham video unit

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now as the international space station

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orbits above your location a radio link

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is established between the iss and your

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school

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now because we're traveling at nearly 18

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000 miles per hour which is an

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incredible 25 times the speed of sound

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we usually get about 9 or 10 minutes of

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good radio contact before losing the

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signal

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so about five minutes before the

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scheduled start time of the contact i

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come into the columbus laboratory and

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configure the radio so that i'm on the

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correct channel and sometimes i'll set

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up the ham video too

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just before the predicted time i'll

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begin to start calling the school using

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the standard amateur radio calling

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techniques

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for example if the call sign of your

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school was gb4 fun i would say golf

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bravo 4 foxtrot uniform november this is

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golf bravo 1 sierra sierra listening and

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standing by

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now at your school the radio operator

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will be listening for my call but may

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also transmit and try to call me as well

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you'll probably have a much more

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powerful transmitter on the ground than

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we have up here on board so i'm likely

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to hear you before you hear me

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then once we can hear each other

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then comes the best bit which is

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actually talking to the students and

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answering the questions

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once i've answered all the questions we

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use the remaining time to say goodbye to

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each other and in the connection

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i'll then spend a few minutes

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configuring the radio back into a

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re-broadcast mode and then i'll go back

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to my day job which is of course doing

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science on board the international space

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station

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iris is a brilliant opportunity for

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astronauts to talk to school pupils it's

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really rewarding to hear how excited the

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students are when they're talking to

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somebody up here in space and it's a

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true privilege to be able to inspire our