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The Internet has worked its way into almost every aspect of our everyday lives, including amateur radio and of course high altitude balloon flights.  Starting with ANSR-11, the cross band repeater is linked to the Internet using IRLP - Internet Radio Linking Project.  Shown below, is the system configuration:

IRLP System Block diagram.

The system contains the following:

Cross Band Repeater - Access from the ground with an uplink frequency of 145.560 MHz and downlink on 445.525 MHz.

Cross Band Radio - Radio capable of half duplex, cross band operation.  Coupled with a high gain omni antenna and clear location for good quality reception.

IRLP Node 9255 - A reflector node is a common connection point that all stations connect to.

Denver IRLP node 3563, Olathe IRLP node 5870 - These are two example local IRLP nodes that have been used to access previous flights.

Getting connected is easy with just a few simple steps:

Program your radio to local IRLP node. A list of nodes is available from the IRLP web site or the 2003 ARRL directory.

Transmit on local IRLP node. Announce, “This is Your Call Sign connecting node 9255”.  Remain keyed up and enter 9255 using DTMF keypad.

After a delay, your local node will key up and you’ll get the message that you are connected to node 9255.

Transmit as normal and we will hear you on the balloon link. Key the radio for 2 seconds before talking to allow all the transmitters and repeaters to operate.

When you are done, enter 73 using DTMF to disconnect.

We look forward to hearing from you on our next flight.

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