I really think we're on the same page.
Appendix A in the PRS-10 manual lists a set of recommended divider settings
such that you can select values for the divider to add a bit more or less
frequency offset so that you can bring the 10Mhz Oscillator into lock at
10Mhz regardless of what the Rb
Hi
Page 19 in the 145190 data sheet sends you off to a bunch of app notes about
designing the rest of the circuit. If the reference frequency used does not
match
what the loop filter is designed for, things will not go well. Spurs and
damping are
both dependent on things matching up.
Bob
>
Hi
In a normal PLL the discrete components on the PCB play a big factor
in how the loop behaves. There are some chips that allow the current out
of the detector to be varied a bit, even on those the discrete R’s and C’s are
still the “big deal” in how the loop behaves. There will be a significant
I suspect someone figured out some of the side effects what you're
describing and adjusted the divisors to better match across all rows. I
just wish SRS would have updated the manual if it was them.
In my device, the R,N,A values were 6114,3456,29. The R,N,A values in the
table in the docs on
Hi Christian,
Good catch!
If the values is scaled up by a factor of three, the phase comparator
frequency is divided by three. This may or may not be much of an issue,
depending on where on the range one is. Too low comparator frequency is
known to cause an issue thought, but once it is
Hi
Ummm ….. e ……
The divisors run down to an output port. There has to be a filter at that port
to
knock down the noise and make the loop close properly. When you multiply the
divisors by three, you cut the frequency at that port by three. You also have a
significant impact on the control
Thanks Forrest,
I've added this to my documentation packed for my own PRS-10; I suspect
that I'm
only a year or two from (possibly) needing it myself.
Dana
On Fri, Sep 13, 2019 at 3:00 AM Forrest Christian (List Account) <
li...@packetflux.com> wrote:
> Mainly wanting to post this to the list
Mainly wanting to post this to the list so it will end up in the archives.
So I decided to give calibration/adjustment of my bench PRS-10 a go.
What I discovered is that on my particular unit, the frequency was enough
off that in order to bring it close to spec, I had to adjust the Mag Offset
to
