Operating instructions

4 1892 1210 - ST500 Transmitter Operating Instructions - v2.12 / May 2007
OPERATING FREQUENCIES
Each radio is made to order to cover a band (the switching bandwidth) of 5MHz within the
range 400 - 540MHz. Each radio is also manufactured to work within a particular channel
width of 12.5kHz, 20kHz or 25kHz. Within the switching bandwidth, the unit can operate
on any frequency provided it is a multiple of the channel width, and up to 128 frequencies
can be stored as numbered channels. Before the unit leaves the factory, each of the 128
channels is allocated to a frequency, but you can reprogram them if you wish.
The first 16 channels can be individually programmed, and the remaining 112 are
sequentially programmed by entering a starting frequency and a step size. The
programming is done using Wood & Douglas software (Sn00.exe) which runs on a PC
under Windows. The PC and the unit communicate via an asynchronous RS232 serial
link.
An adaptor must be used to connect the unit to the serial port of the PC and a power
supply. This also inverts the readback output of the unit and converts from TTL to RS232
levels for the PC. See the Appendix on page 13 for a suitable adaptor.
OBTAINING AND RUNNING THE PROGRAMMING SOFTWARE
1. Download the latest version of the programming software from the Wood &
Douglas site on the internet. The URL (address) is:
www.woodanddouglas.co.uk
In case of difficulty, contact Sales at Wood & Douglas.
2. Open the Zip file and run setup.exe, which will install the software for you.
3. Run the Sn00.exe program. It will run in a normal window with both mouse and
keyboard support.
At this stage, the main window is displayed, similar to that shown in Figure 2.