Frequencies -- what is the average frequency for the human body?

[susan1993]

Hi all,

Would anyone be able to let me know what the average frequency is for the human body?

Also, what is the average frequency of a home? What would be considered abnormal?

According to the Ofcom UK Frequency Allocation Table it notes different frequency uses e.g. a frequency of 1,600 MHz is for certain military/research purposes only.

It also notes that 0-8,000 Hz is unallocated. Does anyone know why this is or what this means?

Thank you in advance.

 

[Orodruin]

Frequency of what in the human body? Frequency of what in a home?

A frequency tells you very little without reference to what it is the frequency of.

 

[davenn]

Hi susan

welcome to PF

Would anyone be able to let me know what the average frequency is for the human body?

Also, what is the average frequency of a home? What would be considered abnormal?

as was hinted at in the previous response ... neither of these comments of yours make any sense

According to the Ofcom UK Frequency Allocation Table it notes different frequency uses e.g. a frequency of 1,600 MHz is for certain military/research purposes only.

1,600 (1.6GHz) may well be used for that purpose in the UK and maybe world wide.
Most countries have frequency allocation tables and again in MOST cases they fall into line with other countries around the world
that is because they all fall under the banner (leadership) of the ITU so that there is a standard use of the radio spectrum world wide
On the whole, it works well with only a few variations in uses between different countries.

https://en.wikipedia.org/wiki/International_Telecommunication_Union

It also notes that 0-8,000 Hz is unallocated. Does anyone know why this is or what this means?

Frequencies below around 10 kHz are full of manmade and natural environmental radio noise. This makes their use for communications almost impossible because of all that background noiseDave

 

[Drakkith]

According to the Ofcom UK Frequency Allocation Table it notes different frequency uses e.g. a frequency of 1,600 MHz is for certain military/research purposes only.

A big, huge, very important note: this refers to the frequency of the electromagnetic radiation used in modern electronic devices. This EMR is mostly used in communications but also includes things like radar.

Neither your house nor your body is an electronic device and as such cannot be placed anywhere on the frequency allocation table. Any references you find in papers or articles about the frequency of the human body are either talking about something else other than EMR, perhaps the resonant mechanical frequency, or are crackpot papers/articles trying to get you to believe in their pet theory.

It also notes that 0-8,000 Hz is unallocated. Does anyone know why this is or what this means?

At that low of a frequency, the wavelength of the EMR becomes enormous and it becomes extremely difficult to efficiently generate or use this EMR. The frequency is also too low to use for almost all communications, as you can't even fit a single voice channel on an 8 kHz carrier signal. I believe they can use this band for submarine communication, as it will penetrate far enough into the water for a sub to detect, but the data rate is abysmal and only used for text-based communication.

 

[CWatters]

Hi all,

Would anyone be able to let me know what the average frequency is for the human body?
Also, what is the average frequency of a home? What would be considered abnormal?

There are quite a lot of web sites that make out everything has a "natural frequency" or "vibration". If you have been reading those then I'm afraid 99% of it is total nonsense.

According to the Ofcom UK Frequency Allocation Table it notes different frequency uses e.g. a frequency of 1,600 MHz is for certain military/research purposes only. It also notes that 0-8,000 Hz is unallocated. Does anyone know why this is or what this means?

Parts of the radio frequency spectrum are allocated to particular users or uses for many reasons. For example you wouldn't want a pop radio station interfering with Air Traffic Control or the ambulance service so these typically all have their own allocated frequencies.

Unallocated frequencies are either free for anyone to use or aren't allocated because they are virtually impossible to use. As Drakkith said it can be very hard to transmit a signal in the 0-8,000 Hz band. Typically to transmit or receive a signal you need an aerial that is around 1/4 of the wavelength or larger and the wavelength of an 8000Hz signal would be something like 37 kilometers. Typical radio stations use frequencies around 100MHz and their wavelength would be about 3 meters and the aerial less than 1m long.

 

[CWatters]

One advantage of extremely low frequency radio signals is that they penetrate water to a usable depth. This makes them potentially interesting for communicating with submarines..

https://en.wikipedia.org/wiki/Communication_with_submarines#Extremely_low_frequency

The US Navy's system, Seafarer, which was a variant of a larger system proposed under the codename Project Sanguine,[1] operated at 76 hertz,[2] the Soviet/Russian system (called ZEVS) at 82 hertz.[3] The latter corresponds to a wavelength of 3,656.0 kilometers. That is more than a quarter of the Earth's diameter. Obviously, the usual half-wavelength dipole antenna cannot be feasibly constructed.

Due to the limited bandwidth, information can only be transmitted very slowly, on the order of a few characters per minute (see Shannon's coding theorem). Thus it is reasonable to assume that the actual messages were mostly generic instructions or requests to establish a different form of two-way communication with the relevant authority.

These days they use satellites and the submarines send up an antenna on a buoy if they want to remain submerged.