50 - 54 MHz
Check with your local
frequency coordinators for variations

50.0-50.1    CW,  beacons
50.060-50.080    Beacon subband
50.1-50.3    SSB, CW
50.10-50.125    DX window
50.125 SSB    Calling frequency
50.3-50.6    All modes
50.6-50.8    Nonvoice communications
50.62    Digital (packet) calling
50.8-51.0    Remote control
51.0-51.1    Pacific DX window
51.12-51.48    Repeater input
51.12-51.18    Digital repeater input
51.62-51.98    Repeater output
51.62-51.68    Digital repeater output
52.0-52.48    Repeater input
52.02, 52.04    FM simplex
52.2    Test Pair - input frequency
52.5-52.98    Repeater output
52.525    Primary FM simplex
52.54    Secondary FM simplex
52.7    Test Pair - output frequency
53.0-53.48    Repeater input
53.0    Remote base FM simplex
53.02    Simplex
53.1, 53.2, 53.3, 53.4    Remote control
53.5-53.98    Repeater output
53.5, 53.6, 53.7, 53.8    Remote control
53.52, 53.9    Simplex