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[linrad] Calibrating analog hardware

What have people found effective as a signal source when doing Linrad's procedure for calibration of analog hardware? In particular, has a tuned amplifier for the RF (or IF) frequency in question been found necessary to get enough S/N?

I have used a pulse generator that produces pulses about 25 ns wide -- so they have significant power up to 40 MHz or so -- but at a PRF of order 100 Hz the S/N in the calibration procedure is marginal.
-- 73, Joe, K1JT