High or low frequency

[Sputnik]

Do lower frequencies travel further than higher frequencies with the same power output?

Sputnik :idea:

 

[flatulent]

It all depends on the propagation mode. Lower frequencies have less loss on ground wave. The D layer (which only exists during daylight times) absorbs the next higher frequencies (MF). The F layers reflect in the low end of the HF range.

 

[Sputnik]

Woh, any tutorials/ebooks that slowly bring you up to knowing those advanced terminolgies.

The idea is that I'm making a simple transmitter and receiver for wireless data transfer between 2 computers 20 meters apart, so far, I've got an oscillator running on a 2.4576 MHz crystal (or a basic AM transmitter).

Sputnik :idea:

 

[flatulent]

For these short distances, the antenna efficiency is what is going to control your distance. With the numbers you give, the separation between the stations is a very small fraction of a wavelength. A decent antenna will be longer than the station separation. All you can do is experiment.

 

[flyhigh]

Hi,

with that small carrier frequency your possible bit rate will be very low, communication is going to be very, very slow (comparable in speed with dial-up modem rather then WLAN)

flyhigh

 

[Animesh]

Hi,

Higher freq wave are less prone to noise will travell longer distance without much loss of power. And it will strongly depends on medium too.

Thanks
Animesh

 

[Sputnik]

The data rate doesn't matter (for now), but I have increased the frequency to 6.630059MHz (I don't know where I found these crystals!)

But now I'm needing to build a receiver and I am not having very good success. Anyway of building a crystal based receiver and not an LC tank receiver?

Sputnik :idea:

 

[userdce]

in some sense yes

but there should not be any plasma cover to stop it as it happens in ionoshere.

otherwise only higher frequncy would be able to go through it

 

[terry andy]

yes high frequency is suitable for WLAN communication!

 

[mbq]

In the same condition, the lower frequency, the further it can transmit.

 

[victorcl]

maybe it is affacted by the surroundings

Added after 1 minutes:

for eg the forrest will absorb special fre seriously

 

[throwaway18]

6.630059MHz

There are aircraft channels around that frequency. Transmitting there could get you into a lot of trouble.

 

[simit]

As flatulent's reply
It all depends on the propagation mode
normally the lower frequency, the further it can transmit.