1-75-0000 SYNTHESIZED UHF 4 WATT PAGING TRANSMITTER TECHNICAL MANUAL Sea Air and Land Communications Ltd, PO Box 22-621, 120 St Asaph Street, Christchurch, New Zealand
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL Issue 0600 11-75 POCSAG PAGING TRANSMITTER 1.0 DESCRIPTION The 11-75 is a stand-alone 4 watt POCSAG paging transmitter with an in-built encoder. The unit can be controlled via an RS232 serial interface to provide numeric, alphanumeric and tone-only POCSAG encoding. This enables a user to call a pager (over 2,000,000 codes), append an appropriate priority level (1 of 4), and add a numeric or alphanumeric message.
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL 1.1 Issue 0600 11-75 Circuit Description: Q7 VCO oscillates at the output frequency determined by L2, C68 and D5 capacity. L2 is trimmed to adjust get the oscillator to a frequency close to the output frequency and output from the synthesizer keeps the frequency phase locked to the reference frequency of 6.25kHz or 12.5kHz.
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL 1.2 Issue 0600 Year 2000 compliance statement: SALCOM has made every effort towards year 2000 compliant systems and software. However, as our products are often used as system integration tools or rely on other systems, we cannot fully determine their behaviour in every environment.
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL 4.0 Issue 0600 MECHANICAL DESCRIPTION The 1175 is enclosed in a pressed aluminium box. The lid will unclip to reveal 16 screw terminals, and adjustment for the low supply detector. The lid can also be used for mounting the unit on a wall, and the overhang can be cut or modified to allow cable entry as required. It is advisable to mount the unit away from sources of heat, damp or vibration. 5.
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL 6.0 Issue 0600 OPERATION The 1175 can transmit three types of POCSAG message, with any one of four function levels: Alphanumeric transmissions. Message can contain any alphanumeric ‘ASCII’ character. • Numeric transmissions. Message contains only Numeric characters and some symbols. • Tone Only transmissions (Alphanumeric or numeric with no message) • 6.1 Alphanumeric transmissions Messages can contain any alphanumeric character.
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL Issue 0600 An action is defined as a paging message, RIC (Receiver Identification Code or capcode) and flags. These flags are discussed in the PSD (product support disk) section. 7.1 External Discrete Inputs An action can be initiated from the twelve external inputs with an input transition to LOW (connection to GND) and/or HIGH (input floating or connection to >+3.5v).
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL Issue 0600 7.2 Low supply message After a de-bounce period, the low-supply detector can initiate an action for both “supply going high” and “supply going low” conditions. 7.3 Watchdog The watchdog feature will initiate an action after a predetermined period. The watchdog timer can be restarted (optionally) by any other action. 7.
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL Issue 0600 CP Usage: CP[] Description: Call tone-only pager Example: CP01193581 Response: CP01193581 Page Sent HELP Usage: Description: Example: Response: MAP Usage: Description: Example: Response: RES Usage: Description: Example: Response: SN? Usage: Description: Example: Response: 7.4.
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL 8.0 TROUBLE SHOOTING If the 1175 does not perform as required, the following points may lead to solving the problem. Fault 9 Issue 0600 Check No illumination of Green LED Bad power supply connection Input activated but no transmission PSD configuration incorrect Unit transmits but nothing received Poor aerial. Wrong frequency, RIC, baudrate. Power too low. Unit too hot.
-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL 9.2 Issue 0600 USING THE PROGRAMMING SOFTWARE: The PSD software allows the user to configure the following characteristics: • Input actions, watchdog, low supply detector, GPS transmission and POCSAG transmission settings • Pre-defined messages • RF frequency and output power • RS232 configuration 100 pager numbers • • Once the program is running, the opening screen appears .
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL 10 Issue 0600 SPECIFICATIONS Power Supply +11.5 V to 15.2 V nom 13.8 V RF Frequency 450-470 MHz Channel Spacing 12.5 KHz or 25 KHz Output Power 4 Watts +/- 1 dB 50 Ω (25 Watts optional) Power Consumption Standby : 45 mA Low power standby - 15 mA Transmit: 1.0A approx Modulation Carrier FSK with NRZ data Deviation +/-4.5kHz or +/-2.
11-75-0000 SYNTHESIZED PAGING TRANSMITTER TECHNICAL MANUAL Issue 0600 SEA AIR & LAND COMMUNICATIONS LTD PO Box 22-621, 120 St.Asaph Street, Christchurch, New Zealand Phone: (03) 379-2298 Fax: (03) 365-1580 Email: info@salcom.co.nz Visit us at www.salcom.co.
