[PD] request assistance with crackles and pops in VFOs driven by modulating accelerometer signals

Andy Farnell padawan12 at obiwannabe.co.uk
Thu Jul 24 13:58:45 CEST 2008

On Thu, 24 Jul 2008 13:22:47 +0900
"hard off" <hard.off at gmail.com> wrote:

> by the way, is it even possible to get clicks when rapidly changing osc~
> speeds?  i didn't think it was, and i have never experienced that.

Think of the modulating signal as a triangle wave altering the frequency 
of [osc~]. As the change becomes fast and large, when the slope is big, then
it's become FM giving us a bunch of sidebands. If a large change happens
briefly a spike of new harmonics will be heard as a click.

What might be in Darrens data stream? 

100, 101.2, 99.98, 101.7, 102.21, 0, 102.96, 103.2

A spurious zero like that would cause a problem.

So, it's a good idea to look at the data closely to see what's going on.

Use the source

Use the source

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