for 262 KKz, 455 Khz, possible 600 Khz and 10.7 Mhz and possibly other's.
Someone was successfull using abother technolofy at changing the frequency at 8 x per second for <= 455 Khz and generating a marker that's 1 ms long. This is done, primarily so the AGC doesn't mess with the signal. The marker would use the scope blanking input. I guess, if I wanted to venture into more unknown territory, I could use a display and make the unit self-contained.
I guess, I would want to select the center frequency and the width but also have a variable marker.
It's Odd that none of the chips seems to have the ability to generate a marker at a specific frequency when sweeping.
With an 8 Hz updating that's not much processing power.
So, lets just say that for starters, there is a 0 to 1 (+-1) Volt signal might be better for the X axis and a to-be determined signal for the Y-axis.
Later, a Log amp might be added and a integral display making the unit self-contained.
Does anyone have an idea what part to select and what, if any output filter is required.