burton
Full Member level 3
tuneable LO and fixed IF
In general, the 1st LO should be tuneable in order to obtain the fixed IF. However, the LO can not be continuously tuneable and it has frequency step (120KHz, 20MHz, etc). It seems that it is impossible to get the fixed IF by using the discretely tuneable LO.
How should I understand the case where the 1st LO which has frequency step is used to obtain the fixed IF?
In general, the 1st LO should be tuneable in order to obtain the fixed IF. However, the LO can not be continuously tuneable and it has frequency step (120KHz, 20MHz, etc). It seems that it is impossible to get the fixed IF by using the discretely tuneable LO.
How should I understand the case where the 1st LO which has frequency step is used to obtain the fixed IF?