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Well, you could use oscilliscope with an external DC ramp sawtooth generator.
Synch your local oscillator to follow the sawtooth.
Synch the horizontal sweep to the external signal and you have a spectrum analyzer.
A device once used in IF alignment of wideband radios at 455khz was the RF wobbulator.
It swept up and down, giving a view of passband (to adjust for even "skirts" on both sides) in radios with continuously variable IFs.
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