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Re: PEC training

 

Paul if you can't see the images, you can click on the link at the bottom and view the messages in the forums which should give you easy access to the pictures

>>> Right now, the worm bearing seems to be the predominant signal in my GUIDED LOGS
with PEC OFF so it needs to be addressed mechanically before I can use
any form of PEC to get a meaningful reduction in total PE (including the
bearing signal).

Let's consider this possibility:

with the middle portion turned off and analyzing only the start and end (no magic here, you can do this with log viewer as well) here is what your residual error looks like:



according to this data, your residuals at ~77sec and 239 (primary pe) are <0.2", with a larger drift peaking around 5000?@ 3"

total residual at every frequency that is < 0.2" - that sounds pretty remarkable

let's look at the same data using RAW RA option:

This represents an estimate based on this data of your actual mount performance by removing the RA corrections. in other words, this should reflect your true mount performance



According to this data (again just the front and back portions) your primary PE is < 1.75" and your secondaries are? <0.75"

If you are comfortable with that mount PE analysis from this data, I'd say you have a fantastically performing mount and you don't need any sort of effort regarding periodic error correction going forward.



On Tue, Dec 15, 2020 at 12:06 AM Paul Goelz <pgoelz@...> wrote:
On 12/14/2020 11:11 PM, Brian Valente wrote:
> FYI when i remove the front and back portions of the log that I assume
> was when PEC was enabled, i get this:
>
> image.png
> Hopefully this illustrates a comment i made earlier about things looking
> "noisy".
>
> Brian

For some reason, your embedded png's did not survive.? All I get are the
filename, but no image.

You unfortunately have it backwards.? The front and back portions had
PEC OFF.? In the middle section I started a PEC training session and
when it completed guiding continued with PEC ON.? When I look at those
sections myself I see that in the middle with PEC ON, the worm and
worm/2 signals disappear and the 76s signal (I think) becomes worse.
Which I totally understand.

My takeaway is that I cannot use the Gemini 2 PEC function if there is
significant non-phase-locked signal such as the 76s signal because it
will either leave it untouched or possibly make it worse.? Right now,
the worm bearing seems to be the predominant signal in my GUIDED LOGS
with PEC OFF so it needs to be addressed mechanically before I can use
any form of PEC to get a meaningful reduction in total PE (including the
bearing signal).

But you said earlier that the bearing signal at 76s will never be larger
than the worm fundamental.? Since I am seeing the 76s signal as the
highest amplitude in the frequency analysis of my almost ALL of my
GUIDED LOGS WITH PEC OFF, I have to conclude that either it in fact IS
the largest signal (and needs addressing) or PHD2 is not guiding it out
as well as it does the worm signal.? Not sure why that would be unless
its waveshape is such that it moves faster than PHD2 can correct at a 2s
frame rate.? Which is possible.

If I am off the beaten track and no one can help me analyze my GUIDED
LOGS, fine.? But all this struggle has at least caused me to think and
understand the system better.

Paul

--
Paul Goelz
Rochester Hills, MI? USA
pgoelz@...








--
Brian?



Brian Valente
portfolio

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