[time-nuts] PN/AM and 1.5Hz spur from frequency doubling?
anders.e.e.wallin at gmail.com
Fri Jan 20 04:06:14 EST 2017
Thanks for all the comments so far.
I will try the doubler with another quieter source, and try removing
various potential noise-sources and exchanging cables...
I have now uploaded a few more images of the same data to the shared album
linked in my earlier post.
On Thu, Jan 19, 2017 at 10:39 PM, Bill Byrom <time at radio.sent.com> wrote:
> I see spurs at 50 Hz and harmonics, which I assume are from the power
> line at your location. This might be due to an oscillation in the power
> supply regulator, leading to nonlinear regulator operation and
> feedthrough of power line ripple. For example, low dropout regulators
> can sometimes oscillate when an additional ceramic bypass capacitor is
> added due to decreased phase margin in the feedback loop. It's also
> possible that there is too much ripple before the regulator and you are
> exceeding the dropout voltage, or that the regulator is going in and out
> of an overcurrent condition. Many odd things may happen if the power
> supply regular isn't working properly.
> Bill Byrom N5BB
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