Hi, I'm using nrf24 on my project. I read the value of a sensor and transfer it using NRF24 SMD model( mini) to my local hub in house .but the problem is that i'm sending back some value to sensor. if i use PA+LNA module on my local hub, is this antenna affect transmitting only or it will increase both receive and transmit range? (i'm using 250kbps, PA_MAX, 16 bit CRC(probably will disable the crc) and 32 byte payload).

 

Hi milad,
Check out this video link for the NRF24 range testing.
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Hey Eric. thanks for the video, but i don't know if i use external antenna, it will affect the transmitting and receive gain both, or only increase transmitting gain?

 

Hey Eric. thanks for the video, but i don't know if i use external antenna, it will affect the transmitting and receive gain both, or only increase transmitting gain?

The external antenna, assuming it is a resonant one (some sold as 2.4GHz antennas are not resonant in that band) will improve the performance of both receive and transmit. The physics of the two are the same and there only one antenna.

 

hi Y,
I agree, but I did read/view an Article explaining that it was the onboard LNA component that improved the RX gain

Hi milad,
Check this video, I know it is basically for a robotic, but it does explain the NRF24 section.
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The external antenna, assuming it is a resonant one (some sold as 2.4GHz antennas are not resonant in that band) will improve the performance of both receive and transmit. The physics of the two are the same and there only one antenna.

Thanks for your reply Yaakov. so this one improve both receive and transmitting right?
NRF24L01+PA+LNA Wireless Module - 1100 Meters RF(ISM) Communication :Elecrow bazaar, Make your making Electronic modules projects easy.

 

hi Y,
I agree, but I did read/view an Article explaining that it was the onboard LNA component that improved the RX gain

Hi milad,
Check this video, I know it is basically for a robotic, but it does explain the NRF24 section.
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Thanks i'll watch it

 

hi Y,
I agree, but I did read/view an Article explaining that it was the onboard LNA component that improved the RX gain

Hi milad,
Check this video, I know it is basically for a robotic, but it does explain the NRF24 section.
E

So base on this video the module with external antenna only increase receive gain. and the transmitter gain because using of better antenna will increase too

 

hi milad,
Yes, that's what the tests are showing.
Both the TX and RX range will be increased
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Like what Yaakov said the antenna, assuming resonant, it will improve the Tx range and Rx range by focusing the radiated energy in a smaller solid angle.

Adding an LNA is important in improving the Rx range as well because it reduces the amount of additional noise in the receiver which increases the sensitivity.

The radiated power will decrease by the 1/r^2 (think of the surface area of a balloon) so increasing the power of the transmitter with a PA will allow the the same power density at a further distance from the antenna.

Make sure there is enough isolation between PA and LNA to not desense the receiver. Also look out for distortions in the PA and intermods that would desens the receiver.