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Once you start looking at a signal above the frequency limit of your scope the vertical accuracy starts to decline however most scopes are usable beyond the design limits somewhat without a serious decline in accuracy as long as it is not far beyond the limit. This only becomes an issue if you are looking for actual levels. If you simply want a station modulation monitor a 20 MHz scope is plenty accurate for that as you are only looking at audio rates and not 27 MHz or more. I have used a 20 MHz scope to look at 29 MHz modulation and 50 MHz was possible but the vertical accuracy for measurements was way off however modulating waveforms were fine.

[QUOTE="Captain Kilowatt, post: 583175, member: 39"] Once you start looking at a signal above the frequency limit of your scope the vertical accuracy starts to decline however most scopes are usable beyond the design limits somewhat without a serious decline in accuracy as long as it is not far beyond the limit. This only becomes an issue if you are looking for actual levels. If you simply want a station modulation monitor a 20 MHz scope is plenty accurate for that as you are only looking at audio rates and not 27 MHz or more. I have used a 20 MHz scope to look at 29 MHz modulation and 50 MHz was possible but the vertical accuracy for measurements was way off however modulating waveforms were fine. [/QUOTE]

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