Ungultige gleitkommaoperation



Keywords: ungultige gleitkommaoperation
Description: translated by George Mathgen, LX1BB, revised by Emily Clarke, W0EEC (2005). Wayne Estes, W9AE (2008 - 2013) The following text relates to questions and problems, which have arisen over time with

translated by George Mathgen, LX1BB, revised by Emily Clarke, W0EEC (2005). Wayne Estes, W9AE (2008 - 2013)

The following text relates to questions and problems, which have arisen over time with the SatPC32 programs.

If you want to track a newly launched satellite, first you must manually configure some SatPC32 data files.

When a new satellite is launched, the available Keplerian element files do not typically contain data for the new satellite. In this case, users can manually insert data into an existing Keps file. The new satellite’s Keplerian data is typically announced by the satellite’s command team via email or a web site.

Important: If the data set is contained in an e-mail first save the mail with "Save as.." in text format (.txt). Then open it and with "copy and paste" insert the data set into the file.

Further, SatPC32 requires data for frequency and mode steering and setting a possible subaudible tone.

If you want the program to automatically switch to the new satellite when it rises you must specify the priority order in the file Prior.SQF.

Some satellites allow calculation of the "Squint" angle. This is the angle that the satellite antennas point away from the user’s location. To utilize this function an entry in the file "Squint.SQF" is required.

Some Keps files don't contain the handy AMSAT name of the satellite. An entry in the file AmsatNames.txt is required if you want the program to display the new satellite's AMSAT name.

SatPC32 stores the necessary data in several text files (Doppler.SQF, SubTone.SQF, Prior.SQF, Squint.SQF, AmsatNames.txt). These files can be opened and edited from the SatPC32 menu "?", "Auxiliary Files". The files themselves contain instructions on how to be used.

With the following link you can display a tutorial by Wayne Estes, W9AE. It describes step by step how to

Most of the SatPC32 data files (auxiliary files) are managed by the program.   However, some of them can be modified manually with a text editor. These are the files that can be opened from the SatPC32 menu “?” / “Auxlilary files”.

It is extremely important that the format of the text entries doesn't change, and this includes the format of line endings. Unix and MacIntosh systems use line endings that are different from the standard line ending, so it is recommended that you use a program such as Windows Notepad that will conform to the convention. Any text editor can be used, but Windows Notepad is convenient as it saves text files in the required format.

It is also important to maintain the ASCII text format in the configuration files. Do not add additional characters unless you are sure those characters conform to the convention used in the file you are modifying.

Until program version 12.7 the data files were stored in the SatPC32 program folder and its sub folders. Starting with version 12.8 SatPC32 stores the program data in a separate data folder. This method of data storage is necessary to conform to the security requirements of Windows Vista. The location of the data folder depends on which version of Windows is in use.

The data files can be opened with Notepad from the SatPC32 menu “?” / “Auxiliary Files”.   From program version 12. 8 SatPC32   includes a simple built-in editor, which can be used alternatively. For information on how to use this editor click on the “Help” button in the editor window.   In the auxiliary file “DivOptions.SQF” you can choose whether the data files shall be opened with Notepad or the built-in editor. With a + (plus) sign in line #5 SatPC32 will open the data files with the built-in editor, or with a – (minus) sign it will use Notepad.

Upon installation SatPC32 will read the Keplerian data from the file ‘nasa.all’ in the sub folder ‘Kepler’. The file contains the data of about 50 satellites (amateur satellitetes, several weather satellites and other satellites like the ISS and the Hubble Space Telescope). The file has been downloaded from   the AMSAT website, see below.

To get precise results the Keplerian data must be updated in certain periods. With the SGP4/SDP4 model used by SatPC32 it will be sufficient to update the data in periods of   1..2 weeks (by experience an inaccuracy of 1 second of the system clock will change the results more than 4 weeks difference in the age of Keplerian data).

There are several methodes to update Keplerian data. A very easy one is the use of the ‘Update Keps’ function in the menu ‘Satellites’. With this function the user can select and download NASA-2-Line data files via mouse click,   for example from the AMSAT or Celestrak websites (it’s not necessary to use the browser for the file dowlodad).

Open the menu ‘Satellites’ and click on ‘Update Keps’. In the window that opens select the file you want to update,   then click on ‘Download’.   If the file is the one that has been chosen to be used with SatPC32 the program will automaticlly use the updated data from the next program start.

The list in the window ‘Update Keplerian Data’ contains by default the download addresses of the AMSAT file ‘nasa all’, the CelesTrak files ‘amateur.txt’. ‘geo.txt’, ‘intelsat.txt’, ‘noaa.txt’and ‘weather.txt’. Upon installation SatPC32 will use the file ‘nasa all’, an ‘all-purpose’ file which will be sufficient for most amateur radio purposes.

If you want to add   the addresses of other source files you can do this by editing the text file ‘Celestrak.SQF’ in the SatPC32 data folder. Add only addresses of HTTP servers (addresses starting with ‘http’), however. The function will not support direct access of FTP servers (addresses starting with ‘FTP’).

To find the download address you may proceed as follows: With your browser navigate to the file and open it. The browser’s address line will then contain the download address. With ‘Copy’ and ‘Paste’ it can be added to the data section of the file ‘Celestrak.SQF’.

Besides the ‘Update Keps’ function SatPC32 provides   several other methodes to update Keplerian data, see below d.  

SatPC32 reads the Keplerian data from source files in AMSAT format (see the file ‘Orbsmanu.ele’ in the sub folder ‘Manuell’) or in NASA-2-Line format (examples for this kind of files are the Celestrak ‘NORAD Two-Line_Element Sets’ files).

It is important that you make sure the Keplerian elements file is in Windows text file format and that line endings conform to this convention. If you copy and paste Keplerian elements from a webpage the line endings may not always be in Windows text format.

Actually the data sets of NASA-2-Line files are 3-line sets (a first line with the satellite’s name and 2 data lines). The naming ‘NASA-2-Line’ is usual, however. The true Space-Track 2-line Datasets without a name line can’t be used with SatPC32 unless a first line with the satellites’s name has been added.

There are two important things to notice. The first is that the lines do not contain blank lines between the second line of the two line element, and (although you cannot see it) the second line of last satellite contains a new line (carriage return) after the last character.

Please Note: Although the programs recognize both formats, the NASA-2-Line files should be preferred because the results are more precise. Furthermore, these files are particularly convenient as they contain data of more than 50 satellites interesting for hams. The 'orbsxxxa.ele' files require more memory space or contain fewer satellites. For manual editing however, only the latter format is suitable.

Store the source files in the   sub folder ‘Kepler’ in the SatPC32 data   folder. Don’t store other files in this folder.

If you want to choose another source file folder the path to that folder must be stored for   future program starts. To do that navigate with the SatPC32 menu ‘File|Open’ to that folder and open a source file. The menu ‘Satellites’ will open, if not, open it by clicking on ‘Satellites’ in the menu bar.

In the menu ‘Satellites’ click on the ‘OK’ button. The new filename and path will then be stored. When a new source file is available in the source file folder it will be displayed in the left list of the menu ‘Satellites’. To select it click on the filename and then on ‘OK’.

Attention: The SatPC32 ‘Update Keps’ function will always write the downloaded files into the sub folder ‘Kepler’ in the SatPC32 data folder. If you want to update Keplerian data with this function you need to keep the folder ‘Kepler’ or to copy the file from ‘Kepler’   into the selected folder.

Usually you will store the Keplerian data files with there original names, i.e. the CelesTrak files or files that have been created with the TLE Retriever (s. below) can be stored as ‘amateur.txt’,   ‘noaa..txt’, etc. When you store the files this way older issues of the files will be overwritten and the program will automatically use the new data from the next program start.

Sometimes the original filenames are rather unhandy, however. The names of files from AMSAT’s   Keplerian Element   E-Mail Service, i.e. look as follows: ‘[keps] orbs05196.2l.amsat’

I personally save these files as ‘Orbs196’ in text format. The extension ‘.txt’ will be automatically attached by Outlook.   The number ‘196’ stands for the day of the current year at which the data were published, the letter ‘n’ for the data format ‘Nasa’. With data in AMSAT format   one could use an ‘a’ instead of ‘n’.

The advantages of this methode: The filename shows the age of the data. Further, the previous file will not be overwritten. If – i.e. – the new file is corrupted or if it contains wrong data or no data for a particular satellite the user can go back to the older file.

However, the program will not automatically use the new file as it would do when you keep the same name   for the updated file. To cause SatPC32 to use the new file click on the filename in the left list of the menu ‘Satellites’ and then on ‘OK’.

With the SatPC32 menu ‘Setup|Observer’ you can determine a file filter. This filter will be evaluated by the left list of the menu ‘Satellites’. This list will therefore display only files that match the filter. Further, the filter will be used as the second one of the ‘Open file’ dialogue (menu ‘File|Open’). The default setting   ‘*.*’ will cover all files. If the source file folder contains only Keplerian data files you should   leave this setting. With folders that contain also other files you may define a proper filter, i.e. ‘orbs. *’ (each   ‘?’ stands for any single char, a   ‘*’ for any sequence of chars). This filter would cover filenames like ‘orbs196n.txt’.

Keplerian elements are published by many organizations, however, most of these get elements from Space Track, which is operated by the United States Airforce Space command. Space Track provides Keplerian elements in real time, and other organizations publish them on a daily or weekly basis. These weekly bulletins are distributed via email, on websites or in the packet radio network under the heading 'Kepler'. In addition, they can be downloaded from the Amsat pages on the Internet.

Upon installation SatPC32 uses the file ‘nasa.all’ in the sub folder ‘Kepler’ in the SatPC32 data folder. The file has been downloaded from the AMSAT website. It contains the data of about 50 satellites: all amateur satellites, several weather satellites and other satellites like the ISS and the Hubble Space Telescope. So, ‘nasa.all’ is a very good all-purpose file for   amateur satellite operation.

To download updated versions of ‘nasa.all’ open the ‘Update Keps’ window in the SatPC32 menu ‘Satellites’ and select the corresponding download address from the list:

The downloaded file will overwrite the previous version of   ‘nasa.all’. The program will then automatically use the updated data. AMSAT updates the file once per week (that is more than sufficient).

CelesTrak is a website created by Dr. T.S. Kelso that is authorized by AFSPC to distribute Keplerian Elements. Many amateurs prefer the format used by Celestrak because it has organized Keplerian Elements into logicial groups called data sets. It also gives amateur satellite elements names according to the AMSAT OSCAR designation, thus AMSAT-Echo is referred to as AO-51.

Also, the Celestrak files are stored as ASCII text files as required by SatPC32 and finally these files can be downloaded with the SatPC32 ‘Update Keps’ function in the menu ‘Satellites’ via mouse click. For hints how to proceed and how to add other CelesTrak data files look here .

When you visit the CelesTrak site you should click on the " Current Data " button under the " NORAD Two-Line Element Sets " heading. This will display the list of element sets. When you click on the heading " Amateur Radio " under the heading " Communications Satellites " the amateur radio elements will be displayed.

One note - satellites that have been launched in the previous 30 days are not contained in the Amateur Radio element set but are in the " Last 30 Days' Launches " element set. If you are interested   to use thees satellites you may need to add the download address of this group to the file ‘Celestrak.SQF’.

When you visit the CelesTrak site you should click on the " Current Data " button under the " NORAD Two-Line Element Sets " heading. This will display the list of element sets. When you click on the heading " Amateur Radio " under the heading " Communications Satellites " the amateur radio elements will be displayed.

One note - satellites that have been launched in the previous 30 days are not contained in the Amateur Radio element set but are in the " Last 30 Days' Launches " element set. If you are interested   to use thees satellites you may need to add the download address of this group to the file ‘Celestrak.SQF’.

AMSAT has been authorized by AFSPC to distribute Keplerian elements by email, through the AMSAT website and via packet radio. AMSAT distributes elements in both NASA TLE format and in the AMSAT Verbose format.

Users with an E-Mail address may subscribe to the AMSAT NA keps service to obtain weekly ata file updates automatically. In order to subscribe to this service, send e-mail to:

Store the files from this service in text format with the 'Save as' command in your email program and be sure to save the file in text format. For hints how to name the files see sect. b. above.Outlook will then add the extension ‘.txt’ to the filename.

Space Track is a satellite data service operated by the US Air Force Space Command (AFSPC). Currently there is no cost to use the service, however due to existing National Security Restrictions pertaining to access of and use of U.S. Government-provided space information and data, all users accessing the Space Track website must be an approved and registered user. Normally you will create a Space Track account and will receive information from Space Track about using the system. To learn more about Space Track visit the Space Track website at:

If you are using Keplerian Elements directly from Space Track you will notice that the satellite names are not the usual AMSAT satellite names which are used by other services. For example you will find that other sources refer to OSCAR 7 as AO-7 and JAS 2 as FO-29, however Space Track will provide Keplerian elements using the formal name (OSCAR 7 and JAS 2). The Space Track satellite names are rather unhandy, so, you should replace them by the usual AMSAT names.

aaa. To do this you may use Dr.T.S. Kelso’s TLE Retriever. TLERetriever is a utility program that was written by Dr. T.S. Kelso and will download element sets directly from Space Track without having to go to the Space Track website. TLERetriever is a free download available at the CelesTrak website:

When you start TLERetriever you can specify the Username and Password for your Space Track account and select the Current Catalog Files for the Space Track Data Sets. Typically you should download the Full Catalog.

Producing Kelplerian element files using TLERetriever is a two step process. You first need to download the Space Track Data Set using the ‘ Download Data ’ button, and then create the CelesTrak Data Sets you want by clicking on the ‘ Process Data ’ button. Alternatively you can launch TLERetreiver and include ‘-update’ on the command line. This will tell TLERetriever to process the data and terminate.

This target folder can not be changed in the TLE Retriever ‘Configuration’ window. To use the files with SatPC32 navigate with the menu ‘File|Open’ to that folder and select a file. Then open menu ‘Satellites’ and click ‘OK’. The filename and path will then be stored for future program starts.

HalloKepler lets you determie the folder for target files. The program stores the filename and filepath in the text file “SaveAs.txt” in the HalloKepler program folder.

bbb. The program HalloKepler by Gerd Riesner, DB3DH, provides similar comfortable abitilities to create Keplerian data sets from Space-Track files that can be used with SatPC32. HaloKepler can be downloaded for free from the website http://www.hallosat.de/.

HalloKepler lets you determie the folder for target files. The program stores the filename and filepath in the text file “SaveAs.txt” in the HalloKepler program folder.

ccc. The program SatRename can also be used to convert Space-Track satellite names. SatRename comes with SatPC32 and can be started from the SatPC32 menu “Programs”.

SatRename does not allow file download from the Space-Track website but expects downloaded and unzipped Space-Track source files.

ddd. Finally SatPC32 istself can replace Space Track names with AMSAT names online without changing the source file. Open the menu ‘Satellites’ and click on ‘Satel. Names’. Then select a proper option.

SatPC32 takes the AMSAT names from the text file ‘AmsatNames.txt’. This file can be opened from the SatPC32 menu ‘Programs ‘. When a new satellite is available it can be added to the list with Notepad.

Keplerian Element files can be downloaded from the AMSAT FTP server. The server can be accessed with the link ftp://amsat.org/amsat/keps/current/

As mentioned above files from this server,   i.e. the file ‘nasa.all’. can be downloaded also via the AMSAT Http server with the SatPC32   function ‘Update Keps’.

If you want to use files that   can be downloaded only (directly) from the FTP-Server, storing problems may occur. Look at the file extension when you download a file from this server. Files with the extension ‘.txt’ are text files which can be read by SatPC32. Files with the extension ‘.all’ (‘nasa.all’, ‘amsat.all’) can not be saved with the MS Internet Explorer in the required text format. When SatPC32 loads such files the message ‘No data found in file …’ will be displayed.

If this error has occurred, reopen the file with a text program such as Wordpad, and save it as (pure) text.

A second solution is to download the file with a text program like MS Word instead of the MS   Internet Explorer. That way the file can be downloaded as a text file and saved in the same format. The file will then be readable by the SatPC32 programs. The browser ‘Firefox’ allows to download the file in text format, too.

Kep files from the packet radio network and from packed radio satellites usually come in the right format and can be saved as such.

The Setup program creates a subdirectory 'Manuell' in the SatPC32 data directory. It contains the files 'Manual.txt' with additional information and 'orbsmanu.ele', a kep file in Amsat format containing the most important ham radio satellites. It can be edited with Notepad or any other suitable editor.

The subdirectories 'Yaesu', 'Icom' and 'Kenwood' contain detailed instructions (text files and sketches) about how to connect your Yaesu, ICOM or Kenwood radio to a Windows PC and control it by SatPC32. The instruction files can also be opened from the SatPC32 menu "?", "Hints[Radio] for. ".






Photogallery Ungultige gleitkommaoperation:


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