A few questions about the allocation of frequencies

[Obit]

I am looking at this chart;
https://www.ntia.doc.gov/files/ntia/publications/january_2016_spectrum_wall_chart.pdf
Why is the lowest kHz "not allocated" and what does that mean?
What do the pink areas labeled "fixed' mean?
Thanks

 

[davenn]

Why is the lowest kHz "not allocated" and what does that mean?

not sure why for 0 - 9kHz
"not allocated" means just that ..... not allocated to any service

Ring up a FCC office and ask them about the 0 - 9kHz ... I am sure there will be a reason

What do the pink areas labelled "fixed' mean?

Usually means fixed location beacons etc

 

[davenn]

In Australia this is the usage ......

Below 8.3 (Not allocated)
8.3 – 9 METEOROLOGICAL AIDS

here is a good PDF covering those low freq's 0 - 9kHz .....
Microsoft PowerPoint - PRATS_BOSCH.pptx (etsi.org)

 

[kellys_eye]

'Not allocated' means (imho) that there are no current rules/regulations pertaining to the use of it. Governments (apparently) 'own' the airwaves and 'sell' licencing to those who want to use specific parts of it.

If that 'un-allocated' band became popular for whatever reason you can guarantee they'd be demanding licence fees to use it.

 

[bertus]

Hello,

There are a number of types of communication below 9 kHz.
Have a look a these wiki pages:
https://en.wikipedia.org/wiki/Radio_spectrum

3–30 Hz, 100,000–10,000 km : Communication with submarines
30–300 Hz, 10,000–1,000 km : Communication with submarines
300–3,000 Hz, 1,000–100 km : Submarine communication, communication within mines
3–30 kHz,100–10 km : Navigation, time signals, submarine communication, wireless heart rate monitors, geophysics

Bertus