TX POWER For Ble Radio Test Example

[ChiragBhavsar]

I used nRF52840 board with SDK 17_1_0 ,

For FCC Certificate We used Radio Test Example,

using  start_channel 40 & start_tx_carrier we change the frequency and we are able to see changeable freq on spectrum analyzer,

But When we send Output_power pos0dBm or  Output_power pos8dBm we are not able to see any power change in spectrum analyzer,

we got -32dbm power on spectrum analyzer when we send both 0dbm and 8dbm command,

so when we want to send Output_power pos0dBm after  start_channel 40 or before it,

or How we can change default power in Radio Test Example.

 

[Håkon Alseth]

Hi,

 

-32 dBm sounds way too low.

Q1: Can you share a picture of the spectrum in both working and non-working scenario?

Q2: Can you share the exact commands that you sent?

 

Kind regards,

Håkon

[ChiragBhavsar]

Hi,

Now we changed the Radio Test Firmware and we make default power 8dbm,

in 8dbm we got -17.13dbm power so This is good for the FCC Certificate? If not good then how we can resolve this problem?

[Håkon Alseth]

ChiragBhavsar said:

RAYTAC MDBT50Q-1MV2 Module

This module has a chip-antenna mounted.

Are you measuring radiated? If so, then you will see a loss in the signal strength.

 

If measuring conducted (ie. via a cable) - how is your setup?

 

Kind regards,

Håkon

[ChiragBhavsar]

Hi,

Yes we measuring radiated,

so this 25dbm signal loss is allow in FCC Certificate?

[Håkon Alseth]

If you are measuring radiated, and you do not seem to have a controlled environment. This means that the signal strength will vary based on orientation/distance and other factors.

ChiragBhavsar said:

allow in FCC Certificate?

The module is pre-certified for FCC, as shown in the picture on the vendor's website: https://www.raytac.com/product/ins.php?index_id=24

 

Kind regards,

Håkon

[ChiragBhavsar]

Hi,

We tested this on FCC Lab Chamber.

In our custom board we are used  RAYTAC MDBT50Q-1MV2 Module & RAK3172 LoRaWan Module,

Both work in different frequency,

so We will conduct the Spurious Radiated Emissions test as per FCC 15.247 (d) / (15.209 & 15.205) to verify the inter modulation component when both modules transmit simultaneously,

so you have any idea for this Spurious Radiated Emissions test 25dbm signal loss is allow?

[ChiragBhavsar]

Hi Hakon,

can you please give us suggestion what we can do next in this situation. 

[Håkon Alseth]

Hi,

 

I would recommend that you contact a test house to perform such oeprations.

I do not have any details about the specific test that you are running, or your setup in general.

 

Kind regards,

Håkon