$50SAT - Eagle2
PICAXE PocketQube
$50SAT - Eagle2

$50SAT (Eagle2)  was successfully launched from Dombarovsky Air Base in Russia on 21/11/13 at 07:11 UTC and is still operational.

The satellite transmits on 437.505Mhz (100mW); the frequency can be up to 10khz higher or lower due to Doppler shift.

$50SAT has a OSCAR designation, MO-76 (Morehead OSCAR 76)

The current location of the satellite can be seen by clicking on this link here.

Details of the communications, hardware designs, software and pictures of the satellite and its build will be found on $50SAT Dropbox here.

$50SAT appears to be catalogue object 39436 (2013-066W) as identified by the NORAD tracking radar.

The $50SAT team can be contacted by email at  fiftydollarsat@yahoo.com

There is a Yahoo discussion group for $50SAT here

You can see a Video of the launch here


The sequence of $50SAT transmissions repeats approximately every 75 seconds. A FM slow Morse call sign beacon, data as fast FM Morse, FSK RTTY data and digital data telemetry.

The slow Morse call sign beacon can be picked up on a hand held UHF receiver when the distance to $50SAT is approximately 800km or less. The received signal can be improved significantly by using a simple gain antenna such as a BiQuad, Moxon or small Yagi.

The FSK RTTY data has been decoded at up to approximately 2400km using an omni directional antenna and low noise amplifier.

Digital data telemetry packets (1kbps) from $50SAT can be received with a ground based RFM22B receiver at approximately 750km using a low noise amplifier and omni directional antenna, with a considerable improvement in reception range when a small yagi is used. The T-logoQube team have reported that their high gain yagi tracking antenna allowed them to send and receive data telemetry packets at up to 2700km.

Together with T-LogoQube (Eagle1), QubeScout-S1 and WREN, $50SAT was the first of the new PocketQube standard satellites to be launched.

The primary purpose of $50SAT was to evaluate if PocketQubes would be a cost effective means for engineering and science students to use for developing real world skills.

$50SAT has demonstrated that very low cost satellites are viable in low Earth orbit. The low build cost of $50SAT (less than $250 in parts) means that Engineering models are readily affordable by schools and colleges. The PocketQube chassis has no precision mechanical parts and can be built from locally obtained sheet metal.

The electronics are comprised of two 40mm square circuit boards. The first is the processor/radio board with the PICAXE 40X2 processor, the Hope RFM22B transceiver module, a temperature sensor, latchup and watchdog protection devices. The second board is the solar power control and monitor board. This board contains the maximum power point controllers as well as current monitors for the battery and summed solar power. The battery is a common 3.7V lithium ion camera battery.

$50SAT was a collaborative education project between Professor Bob Twiggs, Morehead State University and 3 radio amateurs, Howie DeFelice, AB2S, Michael Kirkhart, KD8QBA, and Stuart Robinson, GW7HPW.