Sunday, 17 April 2011

Radio bands

Throughout this web log, there are lots of references to the radio bands: UHF, VHF, VLF, etc. For example, KAIRA will receive VHF frequencies, whereas some of the EISCAT radars operate at VHF, where others work at UHF frequencies. This chart is to put them all in perspective with respect to each other.

AbbreviationFrequency RangeWavelength RangeName
ELF3 to 30 Hz10,000 to 100,000 kmExtremely low frequency
SLF30 to 300 Hz1000 to 10,000 kmSuper low frequency
ULF300 to 3000 Hz100 to 1000 kmUltra low frequency
VLF3 to 30 kHz10 to 100 kmVery low frequency
LF30 to 300 kHz1 to 10 kmLow frequency
MF300 to 3000 kHz100 to 1000 mMedium frequency
HF3 to 30 MHz10 to 100 mHigh frequency
VHF30 to 300 MHz1 to 10 mVery high frequency
UHF300 to 3000 MHz10 to 100 cmUltra high frequency
SHF3 to 30 GHz1 to 10 cmSuper high frequency
EHF30 to 300 GHz1 to 10 mmExtremely high frequency

The two arrays of KAIRA will operate in the high and low ends of the VHF band. The KAIRA HBA will work from 120-240MHz and the KAIRA LBA will operate from 30-80 MHz. As explained earlier, there is a gap between the two, as this is where FM-radio broadcasts occur, and it is impossible to conduct delicate scientific experiments in this region of the spectrum due to such broadcasts.


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