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PECPrep is a free, open source application for the analysis of your mount's Periodic Error (PE) and autoguidng performance. It can import data from variety of dfferent capture sources. PECPrep is able to filter wind, seeing effects, linear and non linear drift to isolate the periodic signal associated with a mounts worm drive. PECPrep can also be used to generate a Periodic Error Correction (PEC) file for use by EQASCOM.
PECPrep can analyse data captured by a variety of popular capture and guiding applications:
PECPRep is available in English, French, Spanish and Dutch and will automatically select the appropriate language based upon your Windows settings. Translation to other languages is possible, please contact the EQMOD Yahoo group for details.
PECPrep uses Fast Fourrier Transforms to identify and filter frequency components from the original data. The filter controls can be combined to offer fine control over how the signal is processed and can be used to identify and isolate potential mechanical problems such as excessive play in transfer gears etc. The PECPrep user interface has been carefully designed to provide the user with clear visual cues whilst data is processed in both the time and frequency domains.
PECPrep allows detailed anaysis of the Frequency Spectrum. Data can be compared against a previously saved reference, perhaps to evaluate the effectiveness of mechanical adjustments such as bearing replacement/lubrication etc.
Once the periodic error signal has been filtered and smoothed the resulting cycles can be combined to build a Correction Curve.
PEC curves can be further or manipulated via the PEC Curve Arithmetic tab:
For further information about PECPrep and VS-PEC see the following:
PECPrep User guide (pdf)
VS-PEC Overview and Workflow (pdf)
PEC & Guiding (pdf)
Lastest execuatble, source and documentation available via the EQMOD Yahoo group.
PECPrep is free. It is not tied to any specific commercial products and there is no hidden agenda behind its development. We would urge anyone interested in PECPrep to try it out for themselves without prejudice.