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I was curious about how the SSM worked and so did some testing today. Manual just says display is of activity five channels above and below the current operating channel in the VFO mode. However, it doesn't define what?
a channel actually is.....and nor did a trawl of Google.

What I have discovered is that when operating FM, a single channel (represented by one of the bar graph columns) equates to whatever frequency value you have selected as your FM step [Menu item 30]. So if step is 50kHz the bar graphs cover a range of +/- 250kHz either side of the dial frequency.

Struggling a bit to understand what I am seeing in SSB. There is a definite relationship with SSB step [Menu Item 47] but values represented are not as clear to me. With SSB step set to 5kHz a received LSB signal (test TX value matched with RX value set on the 818) visually peaks at the centre of the bar graph tailing off to finish at the fifth bar at either end. Anybody able to explain what scale is actually represented in SSB ? I was sort of expecting the LSB signal to cover about 3kHz to the left of the centre of the display which would be just one bar in this configuration if the same logic as found for FM applied.

Brian

It was long time ago but I'm sure I read it somewhere: a channel is equal one step for current mode, bars values are signal levels received in current mode at each channel frequency.

I suppose what you see in SSB is due to received signal saturation and/or bypassing "adiacent signal rejection", you can try tuning to 3kHz*5 => 15kHz up (or down) and see what the Smeter see of your test signal

my two cents
best 73 de IZ3GME Marco