3.3.8.1 Relationship between Emission bandwidth and Reference bandwidth

For a fixed VLR_BW = 200 kHz, and fixed It_BW= 200 kHz, the attenuation Att(dBc/Bref) will be different depending on the values of the Bref in order to achieve the same interference power level.

Case 1, It_BW > Bref :

Bref = 100 kHz, with Att = -3 dBc/Bref, iRSS =  -54.49 dBm;                                           

As mentioned in Section A7.5 on p.287, if the reference bandwidth is lower than the emission bandwidth then the attenuation must be defined with negative sign;

Case 2, It_BW = Bref:

Bref = 200 kHz, with Att = 0 dBc/Bref, iRSS =  -54.49 dBm;                                            

If the reference bandwidth is equal to the emission bandwidth then the attenuation should be set  as zero.

Case 3, It_BW < Bref:

Bref = 400 kHz, with Att = 3 dBc/Bref, iRSS =  -54.49 dBm;                                             

If the reference bandwidth is larger than the emission bandwidth then the attenuation must be defined with positive sign.

Please note that, it is best practice and recommended that the user set the reference bandwidth as the same value as the bandwidth of the emission mask, to avoid any unexpected scaling effect.