NRF52832 received signal strength jumping

RE: NRF52832 received signal strength jumping

MartinBL — Wed, 25 Apr 2018 13:29:11 GMT

Let us continue this here.

RE: NRF52832 received signal strength jumping

liu — Wed, 25 Apr 2018 10:27:33 GMT

hello,

Now i have two troubles in NRF52832 Gateway.

1.Planning introduce：

The only function of NRF52832 Gateway is to scan beacons' advertisements. With beacons‘ number is so huge，so we use three NRF52832 chips and scanning on 37/38/39 channels respectively.But we only use one antenna(SMA footprint) in this gateway. So rear of this antenna is a LNA chip,after LNA chip is power separator chip(1 to 3).Three NRF52832 are connected to power separator directly like image1.

2.PCB introduce:

F2 is LNA，U4 is power separator.RF lines(green )have made 50 Ω.Like photo 2....

3.Our testing method.

SMA antenna is linked with a Signal generator to gerenter a 2.4GHz&2MHz bandwith ble signal.We give the signal strength is -40dBm.

NRF52832 ANT pins is linked to spectrometer to see the waveform.

4.Our finding troubles.

1. Three NRF52832 chips‘ peak point of waveform is jumping about 2dBm when it have burned programs.After erased the program, Three peak points of waveform is stable.

2.Middle NRF52832's signal strength is better than others 4dBm.
5.My Qus:

1.I guess the reason of these two troubles is length of RF lines is so long and not equal each other.
2.How to measure to find the reason causing this two thoubles,Network analyzer?
3.My testing method is appropriate or not.

RE: NRF52832 received signal strength jumping

liu — Wed, 25 Apr 2018 10:27:18 GMT

hello,

Now i have two troubles in NRF52832 Gateway.

1.Planning introduce：

2.PCB introduce:

F2 is LNA，U4 is power separator.RF lines(green )have made 50 Ω.Like photo 2.

3.Our testing method.

SMA antenna is linked with a Signal generator to gerenter a 2.4GHz&2MHz bandwith ble signal.We give the signal strength is -40dBm.

NRF52832 ANT pins is linked to spectrometer to see the waveform.

4.Our finding troubles.

1. Three NRF52832 chips‘ peak point of waveform is jumping about 2dBm when it have burned programs.After erased the program, Three peak points of waveform is stable.

2.Middle NRF52832's signal strength is better than others 4dBm.
5.My Qus:

RE: NRF52832 received signal strength jumping

MartinBL — Mon, 22 Jan 2018 08:39:13 GMT

Hi, I think @Matt 's question was how can you possibly read out the RSSI without any code on your nRF52? Can you give us a step-by-step description of what you are doing?

RE: NRF52832 received signal strength jumping

liu — Sat, 20 Jan 2018 07:41:50 GMT

hello, i uses a RF generator to give NRF52832 board a 2.4Ghz signal at the antenna location.

RE: NRF52832 received signal strength jumping

Matt — Fri, 19 Jan 2018 03:11:38 GMT

So... an empty nRF52 can turn on the radio so that you can measure the rssi?