Quote:
Originally Posted by Station X
I strongly advise you to leave the IF alignment well alone. It can be very difficult to set up even with the correct test equipment.
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Very much agree- whilst the front-end alignment is essentially a much-expanded version of the procedure used for superhets in general, the IF alignment is nothing like the casual tweaking of the four cores in the typical 4 + R with fixed bandwidth. The whole shebang needs to be precisely centred on the narrow-bandwidth crystal, then the varying degrees of over-coupling need to be progressively and painstakingly monitored while adjusting for centering, symmetry and level, and it's all inter-dependent. Not for the faint-hearted, casual or time-pressed approach.