The band 144 - 146 MHz is allocated in all three ITU Regions for amateur radio use. In Regions 2 & 3, the additional segment 146 - 148 MHz is also allocated for amateur radio.
The band is heavily used for local repeater operations, but is also used for SSB and CW, weak signal communications such as meteor scatter and moonbounce, and amateur satellites (for example, the International Space Station has an amateur radio downlink that commonly operates at 145.8 MHz).
In the US and Canada, the major, but not only, use of this band is for mobile half duplex operations through repeaters, often from hand held "handitalkies"/HTs.
The official ARRL-approved bandplan is:
144.00-144.05 EME (CW)
144.05-144.10 General CW and weak signals
144.10-144.20 EME and weak-signal SSB
144.200 National calling frequency
144.200-144.275 General SSB operation
144.275-144.300 Propagation beacons
144.30-144.50 New OSCAR subband
144.50-144.60 Linear translator inputs
144.60-144.90 FM repeater inputs
144.90-145.10 Weak signal and FM simplex (145.01,03,05,07,09 are widely used for packet)
145.10-145.20 Linear translator outputs
145.20-145.50 FM repeater outputs
145.50-145.80 Miscellaneous and experimental modes
145.80-146.00 OSCAR subband
146.01-146.37 Repeater inputs
146.52 National Simplex Calling Frequency
146.61-146.97 Repeater outputs
147.00-147.39 Repeater outputs
147.60-147.99 Repeater inputs
On the 2 meter band, the input and output frequencies of the repeater are separated by a spacing of 600 kHz. Which can be either plus or minus the repeater output frequency.
Many repeaters use CTCSS (Continuous Tone Coded Squelch System) or PL tones on their inputs as indicated in repeater directories.
The usual modulation for repeater operation is FM with a peak deviation of 5 kHz.
The references include links to online and printed repeater directories.
|144 - 146 MHz||Amateur radio 2 m band (all ITU Regions)||Amateur ||N
|146 - 148 MHz||Amateur radio 2 m band (ITU Regions 2 & 3 only)||Amateur ||N
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