Al has explained the basics of sweep alignment very well for those not familiar with that procedure, as for a full blown sweep generator you can get away with a relitively simple homebrew sweep gen if you have a 'scope with timebase out, you can use the sawtooth waveform from this to vary the voltage on a simple varicap/osc affair, somewhere recently I saw the article on this little box of tricks, I can not remember the center frequency ranges in the circuit but I'm guessing 455 khz would have been one of them. I will try and find the article in the mean time unless somebody beats me to it, I think it was a FET + NPN and that was about it. If you have never done sweep alignment Joe, then giving it a go will be quite rewarding both in terms of performance and further understanding of that side of things.
Lawrence
Lawrence
