Long range (at least 500m to 1km in rural area) with NRF905 RF transceivers.

[ltsharma]

I am doing project to help rural people to control motors, water supplies of their farm remotely.
By some researchers I have found some modules
like,
1) NRF905
2) NRF24L01
3)SI4432
4)SI4463
Finally bought NRF905 for testing purpose. (**broken link removed**)
They said that it will communicate upto 1km range.
I don't know any of its features like sensitivity, Power, frequencies, and gains.Can i setup this with external antenna?.
Is it really works up to 1km range?
Thank you

 

[D.A.(Tony)Stewart]

A Friis Loss Calculator will get you started.. Line of sight is crucial without blocking or reflections from trees that cause Fading Loss.
Antenna gain helps a lot at both ends and every dB loss counts when near the threshold.

 

[ltsharma]

Thanks for the reply and informations.
what aspects all are required to achieve maximum range?.
The Specs od NRF905 are:
output power up to 10dBm.
sensitivity of -100dBm.
Included LNA antenna.

Any additional antennas like Yagi antanna can make range differance?

 

[Electro nS]

Thanks for the reply and informations.
what aspects all are required to achieve maximum range?.
The Specs od NRF905 are:
output power up to 10dBm.
sensitivity of -100dBm.
Included LNA antenna.

Any additional antennas like Yagi antanna can make range differance?

offcourse yagi can make difference because it is a directional antenna , but i guess you will lose this extra by making the wires and RF connectors !! (3dB each as i remember)
the next thing , donot trust such products if they donot provide datasheet with specifications regarding frequency , power , baudrate , line of sight range , non-line of sight range .

you are better by over engineering and buying a 2km transceiver so you can guarantee the 1km range , and in this price and size you are getting line of sight communication (in other words , the antenna should see each other nothing inbetween blocking them)

A trick : you can using put one of the antennas at the roof of a high building if their is obstacles in-between.

 

[KlausST]

Hi,

What material is the water pipe?
Metal? Then you could try to use it as data line.

Klaus

 

[ltsharma]

A trick : you can using put one of the antennas at the roof of a high building if their is obstacles in-between.

Yah, that's what my plan is. Putting antennas at good height.
My confusion is, there are many types of antennas, which one to use?, what all the aspects i have to consider in when selecting?.

 

[KlausST]

Hi,

If you want to buy one: Frequency and gain.

If you want to build your own: there are internet pages to calculate Yagi antennas, also there is free software around.

Klaus

 

[BradtheRad]

I wanted to bring in a tv station 90 miles away. I looked at information about homemade antennas. The ARRL handbook was informative.

I chose to make a yagi type because it is easy to construct. It starts as a simple T-shape. By adding elements you increase its gain and directionality.

I made mine from two wood sticks and bare copper wires. Its dimensions were based on calculations from a book.

I believe it added a few dB to my signal reception.

 

[ltsharma]

finally ended up with getting 100m range with NRF905 module.
After the purchase I come to know, there is NRF24l01+ with PA (PowerAmplified) is there with long range.

However, Im going to buy new pairs modules.
1)NRF24L01 + PA + LNA Wireless Module : Promissing 1100Meters range with antenna provided by them.
2)**broken link removed**: Promissing 2000M range with spring antenna.

Now which one can I buy?. I don't want high data rates. Using Arduino for now.