Modulation hum is a phenomenon of mains operated
receivers, and can be particularly noticeable on a local strong signal.
Hum modulated onto the carrier of your transmitter is not "modulation hum" in this context.
What you haven't told us, is whether or not you have tried a battery operated radio with your transmitter.
Quote:
Originally Posted by Mikey405
I wonder why this device is so sensitive to hum relative to the SSTRAN. Hmm.
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One possible reason is that the Spitfire puts out a stronger signal than the SSTRAN. Modulation hum tends to exhibit itself on strong signals.