[time-nuts] PN/AM and 1.5Hz spur from frequency doubling?

Bob Camp kb8tq at n1k.org
Wed Jan 18 12:01:03 EST 2017


Without seeing the circuit involved it’s a bit tough to guess all of the possible
things that might be happening. One branch leads off to things like the circuit
it’s self oscillating and creating the spur. Sub branches involve oscillation in 
a regulator at low frequency vs RF oscillation somewhere else. Another branch 
heads in the direction  of a loose cable running around the shop with a bunch 
of 10 MHz on it. There are many branches ….


> On Jan 18, 2017, at 11:13 AM, Anders Wallin <anders.e.e.wallin at gmail.com> wrote:
> I'm seeing +20-30 dBc/Hz of excess AM/PN, as well as a strong 1.5 Hz spur
> created by frequency doubling from 5 MHz to 10 MHz.
> https://goo.gl/photos/GFx9tQoxrSmyzUQo8
> The input amplitude to the doubler should be just above the recommended 11
> dBm.
> What's going on??
> thanks!
> Anders
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