Operating instructions

1892 1210 - ST500 Transmitter Operating Instructions- v2.12 / May 2007 7
Comparison Freq. (Fc) Fixed by the hardware. Channel spacing can be set to an
integer multiple of this value by setting Table Step Size
accordingly. For example, a Table Step Size of 2 sets Fc to
25kHz if Osc Freq is 12.5kHz.
Intermediate Frequency Displays High Side/Low Side and the Intermediate Frequency,
which is fixed by the hardware and cannot be changed.
PIC Code Only displayed when the Readback function has been used to
download the contents of the unit EEPROM. Otherwise shows
"Code unknown, Ver. unknown".
Help
Help Instructions Displays a window containing instructions for mouse and keyboard
use.
About Displays information about the program and Wood & Douglas,
including website and agent details.
Main Menu Window
Individual Channel Table
The top left pane of the main window, marked Random Channel Table, contains the first
24 channels (0-23), which can be individually set.
Sequential Channel Table
The lower left pane of the main window contains the remainder of the channels. Since
these are set as a block, entry fields are provided below the list to define the starting
frequency and the step (spacing between channels).
Current Settings
The top right pane of the main window contains a number of parameters, most of which
are display-only.
Note: The unit has an operating frequency range (switching bandwidth) of about 5MHz.
Where this band lies in the RF spectrum is determined by the physical build of the
unit and how it has been aligned. If a frequency outside the alignment band is
selected then the operation of the unit will no longer be to the stated specification.
Minimum Frequency The software will not allow a channel to be set to a frequency
below this minimum. This frequency is stored in the non-
volatile EEPROM in the unit.
Maximum Frequency The software assumes a 5MHz switching bandwidth to
calculate the Maximum Frequency from the Minimum
Frequency and uses this to calculate the frequencies in the