Hi Omar,
The VIs for calibrating the 5650/1/2 only read/write with the RF device, the rest of the information is user supplied. So if you want to use a different spectrum analyzer, power meter, etc. you can. The important thing is to make sure that what you are using is at least as accurate as the recommended devices, and can cover all of the same input ranges, otherwise you may end up calibrating the 5651 such that it is farther from the specs instead of more accurate.
Assuming the devices you have are up to the specified requirements though, you should be fine to use them and follow the adjustment procedure.
Regards,
Peter W.