I don't see much of anything around 5 MHz offsets (attached)... -- john, KE5FX
> However, I was quite supprised to notice that there is alot of > modulation on > the 10 MHz output. The histogram shows two distinct gaussian > bells and when > checking the high-frequency modulation it showed a 5 MHz modulation. The > spectrum analyzer clearly shows the 5 MHz output. > > I will make more investigation to the source of that 5 MHz, but > it is annoying. > If it is a property that my 5370B shares with others, then it > will certainly be > a limiting factor for self-referenced jitter measures as well as > use of the > output for low-jitter measures. > > I think the main source of sub-10 MHz clocks is the divide down on the CPU > board A9. It generates control signals which is sent along the > motherboard so > there is alot of chance to jump over and infect the output buffer. > > Could you please have a look with a spectrum analyzer on your 10 > MHz output. > I have not checked how it behaves with external 10 MHz applied. >
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