Transients at start and end of TX

[Damien]

Hi

We have a product with Nordic nRF9E5 coupled to Texas CC1190 amplifier.

We are seeing transients at start and end of TX; worst at end. We appear to be non-compliant wth en300220.  I have tried reducing Nordic TX power before end of TX (ramping) but the command to change power seems to stop TX immediately and transient occurs.

Any suggestions

Thanks

[Damien]

Thanks for the reply.

The recent ETSI EN 303 204 standard permits 500 mW transmissions in the band from 870 MHz to 873 MHz. This would be very attractive to us: it is already adopted in several European countries, and planned in others.

However, our preliminary tests suggest that we will have difficulties complying with at least two aspects of this standard:
- Transient Power (because it specifies Peak detector rather than the RMS detector  that is in EN 300 220)
- Adjacent Channel Selectivity which, based on 300 kHz receiver bandwidth, will have limit of - 22.3 dB; the nRF9E5 seems to have a figure of -7dB for this.

Comments welcome.

[ketiljo]

870-875.6 MHz is listed as Annex 2, band d2 at page 13, with 500 mW but the use of this is limited to data networks. Licencing may be required. 

We haven't tested the nRF9x5 against EN 303 204 as has always been EN 300 220 that has been a requirement. EN 303 204 may have requirement the nRF9X5 won't pass.