At the end of the Group 2 build, there are several calibrations that can be done, providing of course, that you have the proper test equipment. These include the reference frequency calibration, the IF offset adjust and the BFO adjustment.
To perform the reference frequency calibration and the IF offset adjust you need a good frequency counter and a good oscilloscope. I have both; but neither are very good. My oscilloscope is an antique that someone gave me. This boat anchor has to date back to the 50s or the 60s. I suppose I might try the IF offset adjustment this weekend; but I'm probably better off passing this by.
The reference frequency calibration requires a good frequency counter. I have a small Radio Shack job that I picked up used - I can't even remember where. It's not really that good; or that accurate, I suspect. Again, I will probably pass by this adjustment also. Both of these are there to make if you have the equipment. If I don't, I suspect that I will be "close enough".
The BFO adjustment was easy. All I needed was my ears; and even these old ears were good enough to match the pitch of the side tone and the BFO beat note.
On to the Group 3 assembly (the transmitter section) next!
Note to self: Start buying lottery tickets so as to be able to afford fancy test equipment.
72 de Larry W2LJ