Operating instructions

4 1892 1211 - SR500 Receiver Operating Instructions - 2.10 / May 2006
OPERATING FREQUENCIES
Each radio is made to order to cover a band (the switching bandwidth) of 5MHz within the
range 400 - 470 MHz. 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 (STSRn00.exe) which runs on a
PC under Windows. The PC and the unit communicate via an asynchronous RS232 serial
link.
In order to reprogram the unit, 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:
http://www.woodanddouglas.co.uk/products/software/stsrn00.exe
In case of difficulty, contact Sales at Wood & Douglas.
v Note that you must have software version 1.00.21 or greater to program
units labelled “13MHz TCXO”
2. Connect the unit to a suitable supply and to the PC using the programming adaptor
(see page 13).
3. Run the STSRn00.exe program. It will run in a full-screen character session.
v Please note that mouse operation is not supported with this program.
4. You are prompted to enter the serial port number of the PC which is used to
communicate with the unit. Type 1 or 2 and press the <enter> key.
5. In the same way, follow the prompt to select transmitter or receiver: 1: STn00
2: SRn00
6. Finally, select the frequency range: 1 : ST/SR100 (125 - 180MHz)
2 : ST/SR500 (400 - 500MHz)
3 : ST/SR800 (860 - 880MHz)
At this stage, the main menu screen is displayed as shown in Figure 2. The screen
shows the default settings which are displayed whenever the STSRn00 software is run.