I want to transmit a sine wave signal at the frequency of 5KHZ to a distance of 1 kilometer or maybe a little less.

Can someone tell me if this is possible and if it is possible can you suggest me the required amplifier and antenna?

 

Why?

 

I want to transmit a sine wave signal at the frequency of 5KHZ to a distance of 1 kilometer or maybe a little less.

Can someone tell me if this is possible and if it is possible can you suggest me the required amplifier and antenna?

The half wavelength antenna would need to be 30 kilometers of wire. Hardly a practical proposition.

\( \lambda\;=\;\cfrac{c}{f} \)

\( \cfrac{3\times10^{8}\text{ meters/sec}}{5,000\text{ Hz}}\;=\;60\times 10^3\text {meters} \)

On top of that it would be illegal in most jurisdictions to transmit a pure tone like that.

 

Does it need to be omni-directional or point-to-point?

If point-to point, would it meet your requirements if it's line-of-sight using a modulated laser beam?
It should only require a few mW of laser power to reliably go that distance.
Of course, such communication could be interrupted by rain/snow/fog, etc.

Edit: Alternately, for omni-directional, a low power FM transmitter might also be used to send the 5kHz signal.
If point-to-point, directional antennas can be use to increase the range of the low-power FM transmitters allowed for unlicensed transmission.

 

Can you at least suggest me the required amplifier?

 

Can you at least suggest me the required amplifier?

Without knowing more about you application, it's not possible to make a good recommendation.

 

Would it meet your requirements if it's line-of-sight using a modulated laser beam?
It should only require a few mW of laser power to reliably go that distance.
Of course, such communication could be interrupted by rain/snow/fog, etc.

Edit: Alternately a low power FM transmitter might also be used to send the 5kHz signal.

Can you please give more information about your both suggestions?

 

Can you please give more information about your both suggestions?

The laser approach is more difficult and expensive, and requires accurate alignment between transmitter and receiver.
It also may require some custom components.

The FM approach can use off-the-shelf transmitters and receivers, without any accurate antenna alignment required, so that would be the easiest and likely cheapest approach.

What will you do with the received 5kHz signal?

 

Can you please give more information about your both suggestions?

 

Send an FM RF signal.

 

get ESP32 LoRa modules

 

Can you please suggest me some off-the-shelf transmitters and receivers and antennas for this?

I just want to send a signal.

 

Can you please give more information about your both suggestions?

The laser approach is more difficult and expensive, and requires accurate alignment between transmitter and receiver.
It also may require some custom components.

The FM approach can use off-the-shelf transmitters and receivers, without any accurate antenna alignment required, so that would be the easiest and likely cheapest approach.

What will you do with the received 5kHz signal?

Can you please suggest me some off-the-shelf transmitters and receivers and antennas for this?

I just want to send a signal.

 

Can you please suggest me some off-the-shelf transmitters and receivers and antennas for this?

I just want to send a signal.

Tell us what you want to do with the signal once it has been received.

 

@Dimbil000 : There is no need to say the same thing in multiple posts. Everyone sees all replies.

What you are trying to do is illegal in almost all places. It also makes no sense.

What is the underlying problem you are trying to solve? Transmitting a pure sine wave at 5 kHz is almost certainly not the only or best way to solve it.

Have you done ANY reading on the subject? Even just looking at what Wikipedia has to say about it?

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

 

get ESP32 LoRa modules

That will transmit a signal that can be received 1km distant?

 

Can you please suggest me some off-the-shelf transmitters and receivers and antennas for this?

Here's an example FM transmitter.
The receiver can be any good off-the-shelf FM radio/receiver.

If you need more sensitivity to reach 1km, you can add a high gain antenna, such as this, to both the transmitter and receiver.

 

That will transmit a signal that can be received 1km distant?

easily.... in ideal condition more than 300km. more realistic is real world range of about 10km. and that is without ginormous directional antenna
https://en.wikipedia.org/wiki/LoRa

 

Here's an example FM transmitter.
The receiver can be any good off-the-shelf FM radio/receiver.

If you need more sensitivity to reach 1km, you can add a high gain antenna, such as this, to both the transmitter and receiver.

Here's an example FM transmitter.
The receiver can be any good off-the-shelf FM radio/receiver.

If you need more sensitivity to reach 1km, you can add a high gain antenna, such as this, to both the transmitter and receiver.

Thank you very much!

 

in ideal condition more than 300km.

But doesn't that require repeater stations at regular intervals?