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|This page explains all of the detailed settings for the DrzTrack program. Here are links to the various topics|
|When first getting started, all that is required is to select the
correct encoder type for Azimuth and for Elevation, and set the
appropriate ranges, but once you have the initial setup and testing
done you may need to fine tune the controller to your requirements.
The configuration window and explanation for each item follow. Since
the settings for azimuth and elevation are the same, I will only
explain for azimuth. Note that hovering the mouse pointer over
any of the fields will cause a 'tool tip' to pop up, giving more
explanation about what that field is for.
Note that this screen is separated into upper and lower sections. The upper section could be called the mount section. It is where you select the encoder types and calibration and tracking ranges and other settings that are specific to the mount.
The lower section is for the motion controls. These values specify various timing and speed control settings that can be tailored to your particular needs. In the simplest case the motion controls will be the same for all bands that you may be using this mount for. But if you have more than one band on your mount then it may be that movement settings would need to be different for some bands.
If that is the case then uncheck the box labeled "Use same Controls for all Bands". Then a drop down box will appear, showing the current band that you have selected in the main dialog. You can set all the values for that band and then set a new band in the drop box and specify the settings for that band, etc. Note that when you switch to a band that does not yet have any values set up, the values of the band you were on remain in the fields. In that way you are able to copy settings from one band to another and then modify as desired.
|Once you have entered the desired values, use the Send button to save those values. They are sent to the controller board and stored in it's nonvolatile memory. The next time you enter the configuration window you will see the new values that you set.|
|These buttons allow you to save the current configuration, including current antenna positions and counts, to your PC, and to restore them when desired. Click for Details.|
|Clicking the Switch and LED configuration button brings up the
following Dialog box. Currently the switches are fixed
function, and there are no options. For firmware versions
prior to 5.01, switch 3 has an option to be unused or to specify the
resolution for the absolute encoders. Switch 4 is unusable and
must remain in the off (up) position at all times. In the
future more switch options may be enabled.
The default setting for the Single LED on the controller board is as a transmit indicator that can be controlled from DrzTrack or the F1EHN program. If you do not want to use it for this, you may disable that usage and select one or more of the other possible usages.
You may use it to show when the antennas are being jogged, to blink when the Zero Index pulse on incremental encoders is passed, or to light up when the movement timer fails and stops the antennas. Click the Send button to send these values to the controller.
If you have not used the Send to Controller button, the Cancel button abandons any changes you may have made in the configuration window, and returns you to the main setup window.
|DrzTrack directly controls the CT-2 board to provide tracking of
Moon and Sun. There are two ways that other programs may
interact with the CT-2 controller board. One is via direct
serial communication from the tracking program to the
controller. The F1EHN, MoonSked, and EME2008 programs use only
the serial mode. The TrakSM program can use serial mode when
they it is configured for the NovaComm or EasyComm modes.
TrakSM may also be used in the DDE mode; Nova and SatScape can only
be used in DDE mode.
DDE stands for "Dynamic Data Exchange", and is a method for multiple programs running on the same computer to communicate with each other. A tracking program that uses DDE is said to be a DDE server and it sends tracking information to another program via DDE. The DrzTrack program is a DDE client and can receive this tracking information and then relay it to the CT-2 controller board via the serial port interface. When DrzTrack is functioning in this manner, the Tracking section of it's screen will show the name of the body or satellite being tracked, and the current position of that body as determined by the DDE messages from the tracking program. In this mode, the actual tracking program (Nova, SatScape or TrakSM) may be minimized on your computer screen and the DrzTrack screen will show both the current satellite position and current antenna position.
When DDE tracking is started. tracking will be stopped, requiring you to click the 'Start Tracking' button to start moving the antenna. This is a safety feature so the antenna does not start moving until you can see it happening on the DrzTrack screen
If you are using a tracking program that directly communicates with the CT-2 controller via the serial port, you must set up DrzTrack to use that program. Then the program can be run right from DrzTrack. When you end the tracking program you will automatically return to the DrzTrack program where you can test or reset calibration if necessary. This saves a lot of switching back and forth between programs. When running one of the DDE trackers it is necessary to run it from DrzTrack so that both are operational at once.
The Run button in title section of the tracking box in the main DrzTrack shows the name of the tracking program being used. Initially this will always be DrzTrack itself, you must specify any other tracking programs you wish to use and where they are located on your computer, and what the interface method is. If no external tracking program is specified then the Run button will not be shown.
Third party tracking programs are set up in theSetup menu, 'Program Options' selection, in the Programs tab. Here you will see a list of all programs that you have already set up.
Click the 'New Program' button to add a new program.
To edit an existing program name or settings, left-click the program name in the list.
Once one or more programs have been added to the list, you can select the one that you want to currently use with the drop down box at the lower right. This is the program that will be assigned to the 'Run' button in the main dialog.
When the 'Add Program' is clicked, or you left-click a program name to edit it, this dialog box will appear.
First enter the name that you wish to identify the program by. Then enter the full path and file name, or browse to the location of the program. If you browse to the file, you can double click on the file or single click and then use the OK button.
You can enter a command to be passed to the program on the command line if the program supports it. In this example you see the custom data file being passed to the F1EHN program.
Next select the data format that the program uses, then click the Save button.
All of this information will be saved and remembered whenever DrzTrack is restarted.
| This is the first tab of the Program
Options dialog. Here you select the Com Port and baud rate
that you will use to communicate with the controller. The
Serial Ports drop down box will only show ports that are found on
your computer. If the port you want is not shown then it is
not configured or not working.
The default baud rate for the CT-2 is 9600 baud. It can be changed with on board switch settings, but there is little value to higher rates. The system works very well at the 9600 baud rate.
The Box labeled "Path to Call3.txt" is initially set to ".\". That means the program will look for the call3.txt file in the DrzTrack installation folder. But it is helpful to use the same copy of call3.txt as other programs, such as WSJT, do. That way when you add an entry in one program it will be available to the other programs too. So you can change where DrzTrack looks for the file by entering the correct path. You can also use the ::: button to browse for the location you want.
There are 6 check boxes to enable or disable program features. They are described below.
The right side of the window is for configuring the display and usage of the signal or polarity field on the main DrzTrack dialog. When set to "No Show" the field will not be shown. The other options are "Show Signal" and "Show Polarity". If either option is selected the field will appear on the main dialog with the appropriate label.
This feature allows display of a zero to +5 volt input value connected to pad 5 on the controller board (use pad6 for ground). If Signal is selected then the field will show zero to five volts. This could be connected to the AGC output of a receiver, for instance, to show signal strength. It could also be used for any other analog voltage. Care must be used to ensure the voltage does not exceed +5 volts. Using a 7 volt Zener diode in parallel with the voltage input (between pad5 and pad6) is recommended. (If you use a 5 volt Zener the diode will start to conduct as the voltage approaches 5 volts, distorting the readings.)
If "Show Polarity" is selected then the lower portion of the window will be populated with instructions for setting up the polarity display. You must have a 0 to 5 VDC output from your antenna polarity encoder (potentiometer). Set the polarity to horizontal, enter zero degrees in the start degree field and then click the 'Set' button. The input voltage will be read and displayed in the 'Reading' field. Then rotate the polarity to 90 degrees, or whatever your end point will be, and enter that position into the End degree field. Then click the set button and get the reading for that position. Next click 'Apply' or 'Ok' to save the settings. Now the polarity in degrees will be shown on the main dialog. To the left is how your completed setup might appear.
1. Fast Boot. When
checked, the display of boot messages in the main dialog, and on
the LCD display (if present) is greatly speeded up.
Note: For information on the Programs tab of the Program Options dialog, see Tracking with other Programs, on this page.
|The right side of the Position and Band Offsets dialog box (shown
below) can be used to set tracking offsets for each band of
operation. This is useful in situations where you may have
multiple feeds or antennas on the same mount, and they do not all
point exactly in the same direction. For example if your 432
MHz feed is mounted beside your 1296 feed, it might cause the
radiation pattern to be shifted by 5 or 6 degrees to one side or the
other. In that case you can set the offset value for the 432
band and the antenna will automatically be adjusted to track
properly when you select that band on the main dialog. When
you have an offset applied, the compasses in the main dialog will
show the radiation direction in black numerals, but the un-adjusted
antenna mount position will be shown in red numbers. (See the picture below.)
You can also specify a scheduling sequence for each band.
That only affects the transmit / receive periods shown on the
clock portion of the main dialog.
| The left hand side of the dialog is where
you can set up what I call 'Positional Offsets'. This is for
when there is some anomaly in the rotation of your antenna, for
either Azimuth or Elevation. Consider what happens if the gear
or pulley that drives your Azimuth encoder is not mounted at the
exact center of rotation of the antenna mount. This will cause
slight variations in the encoder output value as the antenna is
turned. Normally these variations are very small and can be
ignored, but when operating on a high microwave band with a large
dish antenna, even a few tenths of a degree error can cause loss of
signal. A similar problem exists when the antenna mount is not
perfectly aligned with the surface of the earth. This means
that the rotating mast will tilted a slight amount in some
direction. When the antenna rotates the tilt will cause the
beam to be low in some directions and high in others.
Another example is that the potentiometer or other encoder you are using exhibits some non-linear characteristics. For example, when the antenna is horizontal, the reading is correct, but as you elevate the antenna the reading becomes more and more in error.
Positional Offsets are designed to adjust for such anomalies. It is complicated to think about how this works, and often two people discussing it find that they both are saying something different but meaning the same thing. So it is impossible for me to design a system that will be the way every person thinks. Instead I have picked a scheme and provided several ways to enter, or measure and enter the offsets. I hope this explanation will make sense to most of you.
Positional Offsets use data tables that are entered by the operator and saved on the computer (not in the controller). The saved data contains values for various points in the rotation or elevation of the antenna. Each point contains the number of degrees for the point and the offset at that point. The DrzTrack program will interpolate between these points to determine the correct offset to apply at any given antenna position. Any fixed band offsets will also be added at the same time, so the total offset will be Band Offset + Position Offset.
For Azimuth the first point must be at zero degrees and the last position must be 360 degrees. For Elevation the start and end are at zero and 90 degrees. All points in the table are at even numbered degrees (fractional degree values will be rounded). A point may be entered for each degree in the range 0-360 or 0-90, however in practice no more that 4 or 5 points should be needed because the program interpolates between points and usually the offset change will be linear, or fairly linear over a quarter turn.
Once the table is created and saved (by pressing Apply or OK), it must be enabled before it will be used. Check the box 'Enable this List' to start using the offset table.
Ok, now that you understand the tables, here is how to enter them. There are three methods:
1) Probably the simplest way is to click the little + button just below each table. This will bring up a window where you can enter a position and offset. It is not necessary to enter the positions in any special order, they will be added to the table in order by degree. This method can only be used if you already know what your antenna offset is at the various positions.
2) You can rotate your antenna to each position and then measure the offset. When you use this method you then enter the measured offset in the 'Offset' field below the table and then click the 'Set' button. This adds the point and current position to the table.
3) Measuring the offset may be difficult. You can try to bore sight it against a known object such as the Sun or Moon, but it is easier to use method 3, where the offset is automatically calculated for you. To the right of the two tables is a check box labeled 'Auto-Calculate Offsets'. When that box is checked the difference between the position that the encoder measures and the current position of the antenna will be shown. By rotating the antenna so it is pointed at the Sun or Moon, either by observation, or possibly by measuring Sun or Moon noise, the actual offset will be displayed in the Offset field and you can simply click the Set button to save it. Of course this method requires that you measure when the Sun or Moon is at various positions in the rotation of the antenna and so might take days to accomplish. However as each new offset value is added to the table the aiming will become more accurate, so you can enter one or two points and then add more points as they are encountered.
When using method 3 very precise positioning of the antenna is required, so I have provided a way to 'Jog' the antenna by small amounts to get it correctly placed. To jog the antenna you click one of the four arrow buttons. Each click turns on the motor for a short time. The time the motor is on is controlled by the 'Position Adjustment Increment' drop down box. The choices are 2, 1, 1/2, and 1/10 of a second. Of course if you have switches to manually control your antenna you can use those instead.
Also note that the LCD display on the encoder will continue to display the exact readout from the encoders, and will not include either positional or band offsets. There is a checkbox in the 'General' tab of the Setup dialog that can be used to cause the LCD to display the offset position rather that the encoder position. See the above description of feature checkboxes.
For DrzTrack version 5.10 and later, the absolute encoder programming window has been moved from the setup dialog to the calibrate dialog. So if an absolute encoder is specified for elevation or for azimuth, the corresponding calibrate dialog will show a button labeled "Absolute Encoder Programming". (See below for information on previous DrzTrack versions.)
Clicking the button will bring up this dialog:
When this window is opened, production data is read from the encoder and displayed in the center fields. When you select (click) an encoder shown in the middle list the current values for that encoder will be shown in the set fields below. Then you can change any of them and click the corresponding set button. The new value will be sent to the encoder and then the encoder settings will be re-read and displayed.
You may configure the direction, address, and resolution as you require. The address is the value you are most likely to need to change. As shipped most encoders are set to address 0. The address has to be changed to 1 for use as an azimuth encoder. If you have two encoders set to the same address (0) then you must connect only one of them and change it's address before connecting both.
Low resolution for US Digital absolute encoders gives .1 degree resolution. High resolution may be used if you require .01 degree position accuracy. Note that each encoder may be set for low or high resolution separately. The program detects the setting directly from the encoder and does not require a switch setting (as the previous versions did).
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