A question about frequency range

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Discussion Overview

The discussion revolves around understanding frequency ranges, specifically how to determine whether frequencies are considered long or short. Participants explore the relationship between frequency and wavelength, as well as practical applications related to building transmitters and receivers within legal limits in the USA.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant asks how to determine the range of frequencies (e.g., 80 to 120 MHz, 27 KHz, 10 Hz) and expresses difficulty with understanding units of Hertz.
  • Another participant provides the formula relating wavelength to frequency, suggesting that definitions of shortwave and longwave could assist in understanding.
  • It is noted that higher frequencies correspond to shorter wavelengths.
  • A participant expresses frustration with mathematical explanations and requests a more straightforward, written description of frequency ranges.
  • One participant mentions their intention to build a transmitter compatible with legal limits in the USA and inquires about fixing frequencies for both transmitter and receiver.
  • Another participant suggests joining a ham radio club for assistance with licensing and construction, while also indicating that the original question is too vague to answer effectively.
  • There is a suggestion to open a new thread for questions that diverge from the original topic.
  • One participant discusses shifting plans to use Wi-Fi for a transmitter and receiver, citing obstacles encountered with previous plans and expressing curiosity about Wi-Fi technology.
  • A participant mentions that Wi-Fi operates at 2.4 GHz and suggests that there are charts available for open frequency spectrum use.
  • Another participant advises that finding pre-built transmitter and receiver modules may be more practical than building from scratch due to the complexity involved in the frequency range discussed.

Areas of Agreement / Disagreement

Participants express various viewpoints on the relationship between frequency and wavelength, as well as practical considerations for building transmitters and receivers. There is no consensus on the best approach to understanding frequency ranges or the construction of devices, and multiple competing views remain.

Contextual Notes

The discussion includes limitations regarding the vagueness of some questions and the dependence on specific definitions of frequency ranges and legal limits. There are unresolved aspects related to the technical requirements for building transmitters and receivers.

Who May Find This Useful

This discussion may be useful for individuals interested in radio frequency technology, amateur radio, or those looking to understand the practical applications of frequency in electronics.

sulymani
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Hey guys


How can I know the range of frequency whether it's long or short ? I have hard time knowin the range of for exmple ( 80 t0 120) MHz, 27 KHz ... or small value like 10 Hz .. strugglin with unit of Hz ? please guys convert those values into feet unit or in meter .. that would be great ..
 
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Wavelength is related to frequency by the following:

\lambda = \frac{v_w}{f}

Where v_w the velocity of the wave and f is frequency. You can then use the definition of shortwave and longwave to help you along.
 
The higher the frequency the shorter the wavelength.
 
well .. i know all these stuffs .. my questio How can i know how far the frequecies above go ?? please i am sick of rules and math .. i need just written language.
 
sulymani said:
my questio How can i know how far the frequecies above go ??

Elaborate on what you mean by this.
 
ranger ... i am tryin to build a transmitter that is compatible with the legal limits here in the USA. Further do u know how can i fix the frequency for both the transmitter and the receiver ??
 
You might consider joining a ham radio club in your area.
They can help you with proper licensing and operation as well as helping on transmitter/receiver construction.
As it stands, your question is still to vague to answer.
 
sulymani said:
ranger ... i am tryin to build a transmitter that is compatible with the legal limits here in the USA. Further do u know how can i fix the frequency for both the transmitter and the receiver ??

what has this got to do with the original question? Legal limit as in within the legal operational laws? Try FCC

sulymani said:
Hey guys
How can I know the range of frequency whether it's long or short ? I have hard time knowin the range of for exmple ( 80 t0 120) MHz, 27 KHz ... or small value like 10 Hz .. strugglin with unit of Hz ? please guys convert those values into feet unit or in meter .. that would be great ..

ranger answered this question
 
sulymani said:
ranger ... i am tryin to build a transmitter that is compatible with the legal limits here in the USA. Further do u know how can i fix the frequency for both the transmitter and the receiver ??

Since this seems to be a digression from the OP, I suggest you open a new thread or request that a mentor split this thread into a new one (use the Report button).

Its a good thing that you mentioned your intentions. The airwaves are regulated by the FCC and you must exhibit caution in these regards. Berkeman, one of our mentors, has already cautioned several posters on this matter. You can view some of his comments here. Keep in mind that if you have a specific question for berkeman, it may have to wait until a week or so as he is currently busy with other obligations and may be inactive during that time period.
 
  • #10
you know guys ... I have been thinkin of buildin a transmitter and a receiver that use an FM modulation. However, all plans have changed because of some obstacles came ahead. What I'm ganna do is to build the same transmitter and receiver, but using a short range signal modulator such as Wi Fi. Then I will have a fixed frequency that my transmitter will deal and the receiver, and for the regards of legal limits of FCC. Guys, I am new to the mechanism that's called Wi Fi. A friend of mine just told about it and how useful it would be compared with other mechanisms.
 
  • #12
sulymani said:
you know guys ... I have been thinkin of buildin a transmitter and a receiver that use an FM modulation. However, all plans have changed because of some obstacles came ahead. What I'm ganna do is to build the same transmitter and receiver, but using a short range signal modulator such as Wi Fi. Then I will have a fixed frequency that my transmitter will deal and the receiver, and for the regards of legal limits of FCC. Guys, I am new to the mechanism that's called Wi Fi. A friend of mine just told about it and how useful it would be compared with other mechanisms.

You are better off finding already built transmitter and receiver modules. Building a transmitter from scratch in that frequency range is difficult and requires access to specialized test equipment.
 

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