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STR450 UHF RECEIVER OPERATING INSTRUCTIONS
These operating instructions are intended to provide the user with sufficient information to install and operate the unit correctly. The Wood & Douglas STR450 is a single channel synthesized UHF receiver. The unit is intended to fulfil the numerous OEM applications by virtue of its highly flexible design approach, miniature size and cost-effective performance. The unit complies with MPT1329 and as such does not require an operating licence in the UK. It is also approved to various EC specifications.
INSTALLATION
The STR450 is intended to fit easily and with minimum space requirements into the user's own equipment housing. The complete module is housed in a tin-plated enclosure and a bracket allows the module to be fitted in one of two planes using two screws.
Figure 1 Figure 2
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CONNECTION The type of radio antenna connector (via RF) is determined by the letter designator as follows:
SAP-
SMB miniature coaxial connector flying lead with a BNC connector PTFE (bush) feedthrough
RSSI (when fitted)
Figure 3 The audio output (AF), squelch output (SQ) and DC supply (+V) connections are made via feedthrough pins. These pins incorporate RF filtering, thus ensuring compliance with the spurious radiation levels required by MPT1329 and similar specifications. The squelch output (SQ) is an NPN open collector transistor driver. Connecting the anode of a LED to the input supply rail and the cathode to the squelch output, via a suitable current-limiting resistor, will provide an LED that is illuminated when no RF signal is present.
RSSI Option An `S' meter output is always available for set-up purposes on the internal test point TP1. Depending on the version specified this signal may be wired to an extra feedthrough pin, or it may replace the SQ output (the squelch mute will still operate in this instance)
IC4 Location of RSSI pin when fitted C15 RV1 PL2
L8
Figure 4
USER ADJUSTMENTS It is possible to adjust the level at which the squelch circuit operates using RV1. This adjustment can be accessed by carefully removing the fingered lid. Refer to Figure 4 for location of RV1. When adjusting RV1 take care not to adjust the adjacent L8 or C15.
FREQUENCY PROGRAMMING The STR450 has an internal memory which can store up to 128 RF channels (16 randomly programmed and 112 sequentially programmed). The frequency and set-up information is programmed into the unit by a series of 8 byte data packets over a 1200 baud RS232 interface. Each packet includes a 16 bit sync code and an 11 bit checksum to eliminate the possibility of spurious reprogramming. The software supplied with the STR450 receiver is the STRPRG.exe program, which can be run on a PC with the serial port connected to PL2 of the STR450 receiver via a suitable lead as shown in Figure 5. If the read-back function is desired, then the squelch flag output of the receiver must be connected to pin 2 of the PC serial port, with a 1k pull-up resistor to +5V provided.
Figure 5 Programming lead
RUNNING THE SOFTWARE
1.
Connect STR450 to a suitable supply and to the PC using the programming lead. Insert the STRPRG disk into drive A and type: A:STRPRG then type:
2.
3.
The user is then prompted to enter the serial port number of his PC which is used to communicate with the STR450 receiver. Enter 1 or 2.
After the software has successfully loaded the main menu screen is displayed as shown in Figure 6. The screen shows the default settings which are entered at factory set-up. These default settings will be displayed whenever the STRPRG software is run. Please note that mouse operation is not supported with this program. STR450 Programmer Chan Chan Chan Chan Chan Chan Chan Chan Chan Chan Chan Chan Chan Chan Chan Chan 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 458.5 458.5125 458.525 458.5375 458.55 458.5625 458.575 458.5875 458.6 458.6125 458.625 458.6375 458.65 458.6625 458.675 458.6875 Synth. step freq. 12.5 KHz MHZ << Mhz Ref. (TCXO) freq. 8 MHz Mhz Intermediate freq. 21.4 MHz Mhz Mhz Serial channel selected: 0 Mhz Mhz COMMANDS: Mhz Mhz F2 : copy Ch 16-31 to Ch 0-15 Mhz F5 : read from unit Mhz F6 : program unit Mhz F8 : Select channel Mhz Mhz F9 : set synth. step freq. Mhz F10 : set TCXO freq. Mhz F11 : set Intermediate freq. F12 : QUIT MHZ Mhz Sequential frequencies, Chan. 16 to 127 Khz
Start table 458.7 Max. Freq. 458.95 Table step 1 x 12.5
Figure 5 Screen Display
NOTES: 1. The synthesizer step frequency, the reference (TXCO) frequency and the intermediate frequency are non-programmable. Functions F9, F10 and F11 are not enabled. Function F5 is only enabled when a read-back programming lead is used, (refer to Figure 4). This function displays the current frequency table of the connected STR450 receiver. A value for each parameters has to be entered. Only channel 0 to 15 frequencies can be displayed by this software
2. 3.
4. 5.
Serial channel selection Selecting the F8 function key prompts the user to enter the new serial channel number which is then displayed in `Serial channel selected'. Programming random channels Random channels between 0 and 15 can be entered using the Up 8 and Down 9 arrow keys and then entering the required operating frequency. The entered value must be an integer multiple of 12.5kHz otherwise an `invalid' message is displayed. Programming sequential channels To generate a new frequency table the following parameter values must be entered: start frequency the maximum frequency the table step as a multiple of 12.5kHz. The maximum frequency is calculated from the start table frequency and the table step.. Therefore if the calculation exceeds the maximum frequency then this parameter will be increased automatically. When the frequency table has been generated the user then selects F6 to program the unit. The function key F2 can be used to copy the contents of channel 16-31 to channel 0 15 to ease sequential programming.
Programming from customer equipment In the event of a customer wishing to program the STR450 receiver from his own equipment then the following data sequence must be used allowing 5ms between the characters in the data stream: 1200 baud, RS232 interface, 1 start bit - 8 bit data - no parity - 1 stop bit BE (decimal 190) synchronising code 7 bit channel 0 - 127 (bit 7 = 0) C5 (decimal 197) confirmation byte
Further details on this aspect of programming are available from Wood & Douglas, please contact the Sales Office at the address given at the end of this instruction. RANGE INFORMATION
The following table gives an indication of the typical ranges to be expected between a transmitter and receiver that have simple end-fed dipole antennas. The following assumptions have been made in the calculations: line-of-sight between antennas 0dB gain for the transmitter and receiver antennas 0dB loss for connectors and cables between the antenna and the radio connector 20dB fade and environmental margin -100dBm received signal strength, allowing for digital and analogue signals Range versus TX power Frequency (MHz) 458.5 458.5 458.5 458.5 Power (mW) 1mW 10mW 100mW 500mW Power (dBm) 0 10 20 27 Range (km) 0.5 1.7 5.3 11.9
TECHNICAL SPECIFICATIONS Frequency range Switching bandwidth Frequency stability Number of RF channels : : : : 430 - 450 MHz, 450 - 470 MHz 5MHz +/-1.5kHz 1 of 128 (16 randomly programmed, 112 sequential), serial select/reprogram 1200 baud RS232 5.5 - 15V DC -ve earth <12mA <50mS across switching bandwidth 12.5kHz/20kHz/25kHz available F1D.F2D/F3D <-115 dBm for 12dB SINAD >60dB >50dB >80dB 21.4 MHz and 455 kHz >60dB for 12.5kHz channel spacing >70dB for 25kHz channel spacing 9Hz to 6kHz at -3dB 200mV p-p typ into 10k ohms in accordance with ETS/CEPT specifications Solder terminals SMB bulkhead male -10oC - +55oC -30oC - +70oC -62 x 60 x 25 mm 110g MPT 1329 Noise operated open collector output RSSI output (0 to +3V nominal) option
Supply voltage Supply current at 7.2V Channel switching delay Channel spacing Modulation type Sensitivity Image/spurii Intermodulation response rejection Blocking Intermediate frequencies Adjacent channel selectivity Audio response Recovered audio level Spurious emissions (conducted & radiated) Interface connections RF connection Operating temperature Storage temperature Size overall Weight Type approval Squelch type General facilities
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Wood and Douglas Ltd, Lattice House, Baughurst Road, Tadley, Hampshire RG26 5LP Tel: +44(0) 118 981 1444. Fax: +44(0) 118 981 1567
1.1/October 1998. 1892 1207

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