Question to regulatory terms

[Rashid Talib]

Hi

For the qualification we need to know the values of the parameters listed below. Our hardware uses a nRF52805 and can operate in both ESB and BLE mode.

• Operating channel width, OCW
• ITU radio emission designation
• Frequency of LO signal (min, nominal, max)
• List all intermediate frequencies
  
• List all image frequencies of the first and subsequent frequency conversions

Please advice, if possible provide references to formulas or specifications.

Thanks for your help & best regards

Rashid

[JONATHAN LL]

Hi Rashid,

• operating channel width, OCW
  Aprox 1 or 2 MHz, depends on the datarate
• ITU radio emission designation
  1M00F1D or 2M00F1D
• Freq of LO signal (min, nominal,max)
  fRX + 1 MHz for 1 Mbps or fRX + 2 MHz for 2 Mbps fRX - 1 MHz for 1 Mbps or fRX - 2 MHz for 2 Mbps
• list of intermedieta frequencies
  1 or 2 MHz
• list of all image frequencies of the first and subsequent freq converisons.
  fRX - 1 MHz for 1 Mbps or fRX - 2 MHx for 2 Mbps. fRX - 2 MHz for 1 Mbps or fRX  - 4 MHx for 2 Mbps.

Regards,
Jonathan

[Rashid Talib]

Hi Jonathan

Thanks for your reply, that's ver helpful.

I have a question related to the image frequency:

Let's say the RX frequency is 2440MHz and the LO frequency is 2441MHz. Wouldn't the image frequency be at 2442MHz then? After the mixing with 2441MHz, both the wanted signal from 2440MHz and the image frequency from 2442MHz will be down converted to 1MHz. Please correct me if I'm wrong, I may have a wrong understanding of the image frequency.

Best regards
Rashid

[JONATHAN LL]

HI,

Need to make a correction:

• Freq of LO signal (min, nominal,max)
  fRX - 1 MHz for 1 Mbps or fRX - 2 MHz for 2 Mbps
• list of intermediete frequencies
  1 or 2 MHz
• list of all image frequencies of the first and subsequent freq converisons.
  fRX - 2 MHz for 1 Mbps or fRX  - 4 MHx for 2 Mbps.

will update the original answer wit the corrections.