The first phase of QB50 CubeSats should be deployed from the International Space Station over three days May 16-18, 2017.

Download QB50 ISS CubeSats Deployment and Radio Information PDF

Update May 16: 
3rd deployment 0145 GMT May 17
7th deployment 0825 GMT May 18

Built by university students and research organisations from 23 countries around the world, the QB50 constellation aims to study the lower thermosphere 200-380 km above the Earth.

There are 28 QB50 CubeSats on the ISS awaiting deployment and it is understood that 11 will be deployed in this first phase. The beacons should be activated about 30 minutes after deployment.

The QB50 CubeSats have downlinks between 435.8 and 438 MHz and reports from radio amateurs are most welcome. Beacon data received can be uploaded to a dedicated QB50 webpage at
https://upload.qb50.eu/

Two of the ISS QB50 CubeSats, ON01FR 437.020 MHz and ON05FR 436.880 MHz, carry V/U FM transponders. The uplink frequency for both is 145.860 MHz with 210.7 Hz CTCSS, see http://site.amsat-f.org/2017/05/12/qb50-document-de-description-des-telemesures-des-satellites-on01fr-on05fr/

List of QB50 CubeSats with Beacon format and frequency information
https://upload.qb50.eu/listCubeSat/

Keplerian Two Line Elements (TLEs) ‘Keps’ for new satellites launched in past 30 days
http://celestrak.com/NORAD/elements/tle-new.txt

QB50 project https://www.qb50.eu/
https://twitter.com/QB50Mission

On the deployment days radio amateurs and QB50 teams will be on the #CubeSat IRC channel. Join the deployment chat at http://irc.lc/freenode/cubesat

Don’t have a suitable 435-438 MHz receiver? Try listening online with the SUWS WebSDR located near London http://websdr.suws.org.uk/

On June 19, 2014 two precursor QB50 CubeSats were launched, QB50p1 and QB50p2, which carried amateur radio transponders
https://amsat-uk.org/2014/06/19/successful-launch-of-amateur-radio-satellite-payloads/

CubeSats being deployed from the ISS on February 11, 2014

Two South African built satellites are about to be launched to the International Space Station as part of the QB50 project.

SARL News reports:

The South African satellite industry is taking another step forward as a player in the international space arena with the launch of two South African built nanosatellites from Cape Canaveral in Florida USA.

Two CubeSats, ‘nSight1’ (QB50 AZ02) designed and manufactured by Cape Town-based SCS Space, a member of the SCS Aerospace Group and ‘ZA-Aerosat’ (QB50 AZ01) designed and manufactured by CubeSpace of the Stellenbosch University, are to be launched as part of a batch totaling 28 CubeSats from 23 different countries

The launch is set for April 18, 2017 at 15:11 GMT. Their initial destination is the International Space Station (ISS), where they will be unloaded by the ISS crew with the help of robotic arms. The satellites will eventually be deployed into low-earth orbit over a period of 30 to 60 days as the ISS orbits the Earth.

Both the South African satellites are part of the QB50 project funded by the European Union and managed by the von Karman Institute to conduct research in the lower thermosphere between 200 to 380 km altitude. The data collected from this experiment over a period of 18 months will be used to complement current atmospheric models especially applicable to re-entry trajectories of spacecraft. All CubeSats will eventually burn up at the end of their operational lifetimes.

All the CubeSats in the QB50 project will mainly operate on frequencies in the 2 m and 70 cm amateur bands. To avoid interference to terrestrial amateur radio activity the frequency was coordinated by the IARU Satellite Adviser and his advisory panel http://amsat.org.uk/iaru

QB50 project https://www.qb50.eu/

JE9PEL QB50 CubeSat Frequency Spreadsheet
https://amsat-uk.org/2015/11/08/je9pel-qb50-cubesat-spreadsheet/