Amateur radio frequency bands, power and classes of emission are defined in Annex 1 of the IMDA Amateur Handbook. The latest version is Version 2 from December 2018.
Except for 60 m (5.3 MHz), all bands from 160 m to 10 m are available for ham operation. 160 m and 80 m are shared with other services. The allowed power is 300 W DC input power or 800 W PEP output power (CW, SSB). On 160 m, output power is limited to 26.67 W PEP, RTTY is not allowed. The 30 m band is allocated to amateur radio on secondary basis.
Although Annex 1 of the IMDA handbook shows a frequency allocation of 7.0 to 7.1 MHz for the 40 m band, with effect from 29 March 2009 IMDA approved the operation from 7.0 to 7.2 MHz on a primary basis.
Use of any frequency in these bands shall be only with the prior written consent of the IMDA. Power limit on 2 m is 25 W PEP, on 70 cm 10 W (erp). Spot frequencies for 70 cm (UHF) are:
- CW 432.000 MHz,
- SSB/CW 432.200 MHz,
- RTTY/FAX 432.600 MHz,
- FM simplex 433.625 MHz and 433.650 MHz.
In Singapore the 6 m band is not available for amateur radio operation.
From Aug 13, 2019 onwards, the frequency bands 2300-2400 MHz and 3300-3500 MHz are no longer available for amateur radio in Singapore, and will be removed from the IMDA Radio Amateur Handbook.
When established as a mobile or portable station, the call-sign shall be the call sign allotted to the general station followed by /M or /P
Transmitter output power of the portable station shall not exceed 10 W (erp)