LAUNCHXL-CC1352P: Spurious emission observed at +20dBm setting on Launchpad

Ashish Kubal1

Hi,

We are testing spurious emissions on Launchpad with @20 dBm, BLE Packet Transfer at 125kbps. We are seeing out of range emissions at the following two frequencies. We are doing conducted tests at SMA connector:

3.58725GHz	-28.89dBm
1.29497GHz	-17.54dBm

Pls check and let us know if there is something wrong.

Regards,

Ashish

over 5 years ago

0 Alexis Crandall20 over 5 years ago

TI__Genius 15590 points

Hi Ashish,

We will look into this and get back to you ASAP.

Thanks,

Alexis

0 RGW over 5 years ago

TI__Mastermind 32310 points

Hi,

Are you using LAUNCHXL-CC1352P-2 ?

Which market are you targeting with 20 dBm output at 2.4 GHz ?

Please provide a plot of your spectrum since the frequencies you mention are not the standard frequencies we normally see spurs.

Regards,

Richard

0 Ashish Kubal1 over 5 years ago in reply to RGW

Prodigy 130 points

HI,

We are using LAUNCHXL-CC1352P-2

For UK market

I had requested plot from lab,it will take 2-3 day for getting report.

Regards,

Ashish

0 Ashish Kubal1 over 5 years ago in reply to Ashish Kubal1

Prodigy 130 points

Please find attached plots provided by lab ,observed on launchpad.

There are 2 folders one is for above 1GHz and another for below 1GHz.

We have taken observation for 10dbm,16dbm and 20dbm setting

Regards,

Ashish

below 1GHz on Launchpad CC1352P-2.zip Above 1GHz on Launchpad CC1352P-2.zip

0 Ashish Kubal1 over 5 years ago in reply to Ashish Kubal1

Prodigy 130 points

Hi Richard,

Do there is any update on this,

Regards,

Ashish

0 RGW over 5 years ago in reply to Ashish Kubal1

TI__Mastermind 32310 points

Hi Abish,

In Europe (ETSI), we cannot have greater than 10 dBm EIRP at 2.4 GHz. Therefore, you must reduce the output power to pass ETSI standards.

Regards,

Richard

0 Ashish Kubal1 over 5 years ago in reply to RGW

Prodigy 130 points

Hi Richard,

We observed spurious emission on launch pad at 10dbm(2.4GHZ) for 192MHz which is concern for us in conducted SE test.Results already shared in this E2E post

Regards,

Ashish

0 RGW over 5 years ago in reply to Ashish Kubal1

TI__Mastermind 32310 points

Hi,

What is your antenna gain since this has to be reduced from the conducted output power limit.

If you antenna gain is 4 dBi, then in order to pass Power Spectral Density Tests that has 10.0 dBm limit, the output power would have to be reduced to 6 dBm for Europe.

We did not see any failures at 192 MHz when we tested at the regulatory house with the LaunchPad.

Regards,

Richard

0 Ashish Kubal1 over 5 years ago in reply to RGW

Prodigy 130 points

We are not using antenna in module.Antenna will be in product and we will set power accordingly.

Which method is used to Spurious test Radiated or conducted?Please share test report.

As module don't have antenna its compliance will done through conducted port.

Regards,

Ashish

0 RGW over 5 years ago in reply to Ashish Kubal1

TI__Mastermind 32310 points

Hi,

Both conducted and radiated tests must be performed.

If you are using an external antenna; then you have to take this into account.

i.e. maximum output power from module = maximum conducted output power limit minus the gain of the external antenna.

Regards,

Richard

Bluetooth®︎

Bluetooth forum

LAUNCHXL-CC1352P: Spurious emission observed at +20dBm setting on Launchpad