Hi,
Considering that you have a diode and a tuned LC-tank, the tank will
"ring" in it's own frequency, even if it is driven by the diode and 5
MHz. This creates a single side-band tone which then shows up both as AM
and PM. Well, that is my guess. 1.5 Hz is however very very close, which
is quite impressive for 10 MHz, so there should be something more going
on, I'm just speculating.
This gives some insight as one of many:
https://www.minicircuits.com/app/DOUB9-2.pdf
See the warning of over-power on last page.
MVH
Magnus
On 01/18/2017 06:01 PM, Bob Camp wrote:
Hi
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 ….
Bob
On Jan 18, 2017, at 11:13 AM, Anders Wallin <anders.e.e.wal...@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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