Related Manuals for Tait TOP 271A-T0 Series
Summary of Contents for Tait TOP 271A-T0 Series
- Page 1 TRM mobile data Tait Radio Modem (TOP-x271A-T0) Service and Operation Manual M2235-01-200-812 Version 1.00 February 2004 © Tait Electronics Limited...
- Page 2 Note: For the addresses and phone numbers Tait Europe of the above regional offices refer to the TaitWorld website. Regional Head Office - United Kingdom Tait Mobile Radio Ltd E-mail: teusales@tait.co.uk Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
- Page 3 THIS LICENCE WILL BE TERMINATED EXCLUSIVE RIGHT TO USE THE SOFTWARE OR AUTOMATICALLY AND WITHOUT NOTICE FROM FIRMWARE ON A SINGLE MACHINE PROVIDED TAIT IN THE EVENT THAT THE LICENSEE FAILS TO YOU MAY ONLY COMPLY WITH ANY TERM OR CONDITION OF THIS AGREEMENT...
- Page 4 FOR ANY TERMS OF AGREEMENT TO THE CONTRARY DIRECT OR CONSEQUENTIAL DAMAGE ARISING BETWEEN TAIT AND THE LICENSEE THIS IS THE OUT OF OR IN CONNECTION WITH ANY USE OR COMPLETE AND EXCLUSIVE STATEMENT OF THE INABILITY OF USING THE SOFTWARE OR...
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Page 5: Table Of Contents
Presets ..........33 Tait Radio Modem (TOPx271A-T0) Service and Operation Manual... - Page 6 Power Level ......... . . 63 Tait Radio Modem (TOPx271A-T0) Service and Operation Manual...
- Page 7 Calculating the CCDI [CHECKSUM] ......78 CCDI Commands to the Tait Radio Modem ....79 CCDI Commands from the Tait Radio Modem .
- Page 8 Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
- Page 9 Copyright All information contained in this manual is the property of Tait Electronics Ltd. All rights are reserved. This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, stored, or reduced to any electronic medium or machine-readable form, without prior written permission from Tait Electronics Ltd.
- Page 10 This alert is used to warn about the risk of equipment dam- age or malfunction. Note This alert is used to highlight information that is required to ensure that procedures are performed correctly. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
- Page 11 Short Data Message SINAD Signal, Noise and Distortion Tait Orca Portable Tait Radio Modem Transmit Transmit Data UART Universal Asynchronous Receiver-Transmitter Ultra High Frequency Video Graphics Adaptor Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
- Page 12 Abbreviation Description Very High Frequency VSWR Vertical Standing Wave Ratio Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 13: Introduction
Introduction The Tait Radio Modem (TRM) is intended primarily for data communications. It provides an interface to a standard Tait Orca Portable radio PCB, and operates with all current Tait Orca series programming applications. It has an RS-232 interface, line level buffering, power supply and an interface for a speaker/microphone. -
Page 14: Trm Configurations
These are: As a Radio Modem To use the Tait Radio Modem as a modem, connect the unit directly to any RS-232 computer terminal equipment, via the RS-232 port. There are two modes of operation available using this port:... -
Page 15: Specifications
European specification ETS 300-086. Details of test methods and the conditions which apply for type approval testing in all countries can be obtained from Tait Electronics Ltd. General Specifications Modulation Type Frequency Increment 5, 6.25kHz... -
Page 16: Receiver Performance
4 minutes receiving at max temp and voltage. Spurious Emissions: -36dBm (Conducted and radiated to 1GHz) Adjacent Channel Power: 60dBc Deviation Limiting: ±2.5kHz (narrow) ±5kHz (wide) Introduction Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 17: Software
VSWR 5:1 (all phase angles) Software Programming Software TOPCPA version 3.3.0. or later, except 3.6.1 Programming Firmware 2235A12x Note x denotes the version of the software or firmware. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Introduction February 2004 © Tait Electronics Limited... - Page 18 Introduction Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 19: Disassembly And Assembly
1M series resistor conductive rubber bench mat conductive wrist strap metal frame If in doubt, contact Tait Electronics Ltd or your nearest Tait dealer. Warning: Repairs attempted with incorrect equipment or by untrained personnel may result in permanent damage. - Page 20 Torx T6 driver. When replacing these screws, set the driver to 2 inch pounds. Pozidriv screws should be removed using a Pozi 1 driver. When replacing these screws, set the drive to 7 inch pounds. Disassembly and Assembly Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 21: Disassembly
The diagrams and table following provide information to assist disassembling and reassembling the Tait Radio Modem.The manufacturing process does not allow direct servicing access to components on the Tait Orca PCB. Service repairs are therefore limited to key mechanical devices associated with the main PCB. For information regarding the Tait Orca PCB, see the standard Tait Orca Service Manual. For information regarding the TRM PCB, see the PCB Information section of this manual. - Page 22 Disassembly/Assembly Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 23: Mechanical Parts
Cbl Auto 7/0.32mm Pvc Red 201-00050-10 Cbl Auto 7/0.32mm Pvc Blk 008-00014-81 LED 5MM Red/Grn Bicolor 030-53220-20 Res Flm 4x1.6 220e 5% 0.4w Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Disassembly and Assembly February 2004 © Tait Electronics Limited... - Page 24 Scrw M3*8MM P/P S/T Bz 353-00010-12 Wshr M3 Spring Bz Or Z/C 354-01041-00 Fsnr Scrw Lok Kit 4-40 345-40440-00 Scrw M3*6MM Csk Blk Disassembly and Assembly Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 25: Circuit Description
RF Platform The TRM RF Platform is based on the standard TOP PCB. Refer to the Tait Orca Service Manual for details on the RF circuitry. However, in the TRM there are several modifications made to the standard TOP PCB. -
Page 26: Rs-232 Interface
U8. This isolates the line audio section from the speaker/mic section, when a speaker/mic is plugged in. It is switched by SW4. Circuit Description Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... - Page 27 PCBs. Q13 forms an inverter for the external PTT, with LK1 selecting active high or low. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Circuit Description February 2004 © Tait Electronics Limited...
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Page 28: I/O Connections
Data from Radio Data to Radio Not used Ground Data set ready Request to Send Clear to Send 12-way top entry socket Connects to Tait Orca PCB via TOP Accessory Loom Function Description EXT-PTT EXT+SPKR SENSE-0 Connected to RTS EXT-SPKR... - Page 29 Not Connected Not Connected 5V supply 19 - 20 TX-AUDIO Audio to modulator - limited 4-way micromatch socket Connects to Tait Orca PCB via Channel Select Loom Function Description KNOB2 Channel select bit 3 KNOB0 Channel select bit 1 KNOB3...
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Page 30: Connectors On Xa2235-02-Pcb Assembly
Interface Coupling PCB and pin signals do not correspond directly to the same pins on the audio port on the XA2235-01- PCB Tait Radio Modem PCB. Circuit Description Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 31: Installation And Setup
Installation and Setup This section describes installation and setup required before the Tait Radio Modem can operate. It includes: installation internal settings channel selection programming calibration Equipment Supplied Tait Radio Modem Power Lead Software application CD-ROM Precautions Mount the TRM on a vibration-free structure, conveniently for access and wiring. -
Page 32: Installation
The diagrams that follow show the three options. As a Radio Modem: As an RF Platform: As a Voice Radio (testing purposes only): Installation and Setup Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 33: Internal Settings
(pins 3 and 4) Presets Line In level adjustment Line Out level adjustment Balance between flat and emphasised audio (factory only) Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Installation and Setup February 2004 © Tait Electronics Limited... -
Page 34: Channel Selection
Switch 2 Switch 3 Switch 4 Selecting Channels Externally To select channels externally, set up the TRM using the diagram and instructions below. Installation and Setup Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 35: Programming
Your TRM may already be configured to your specifications, but if not, see the software configuration information in the Programming section. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Installation and Setup February 2004 © Tait Electronics Limited... -
Page 36: Calibration
Calibration The TRM operates with all current Tait Orca Portable series programming applications. However, if the radio requires re-calibration in the field, particular attention is needed to set the maximum volume in the calibration software. Note In a standard TOP radio, the number displayed on the screen (e.g. -
Page 37: Pcb Information
PCB Information This section contains all PCB information for the Tait Radio Modem. The following PCBs are documented: Main Top PCB Modifications only. For full PCB information, see your standard TOP service information. Radio Modem PCB XA2235-01 9-way D-range/MMatch Decoupling PCB XA2235-02. - Page 38 PCB Information Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 39: Xa2235-01-Pcb (Pcb Ipn 228-22351-04)
Cap 0603 100n 16v Y5v +80-20% 038-15100-00 Res 0603 10k 1/16w +-5% 018-14100-00 Cap 0603 1n 50v X7r +-10% 038-14100-10 Res 0603 1k0 1/16w +-1% Tait Radio Modem (TOPx271A-T0) Service and Operation Manual PCB Information February 2004 © Tait Electronics Limited... - Page 40 IC SMD ADM202 Rs-232 Con S0-16 002-10003-58 IC SMD LM358 Dual 0-Amp 002-12676-00 IC SMD LM2676 Adj Reg 3a T0263 002-19120-00 IC TS912ID Cmos R2R Opamp PCB Information Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 41: Non-Smd Parts List (Rev 19)
Skt 9W Drng Submin 4-40bus 240-02020-08 Skt Miniphono Stereo 2.5mm 240-02020-09 Skt Miniphono Stereo 3.5mm 319-30071-00 Spcr 5mm LED*6.4 Blk 228-22351-04 Tait Radio Modem Interface PCB Tait Radio Modem (TOPx271A-T0) Service and Operation Manual PCB Information February 2004 © Tait Electronics Limited... - Page 42 PCB Information Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 43: 228-22351-04 Pcb Top Side
228-22351-04 PCB Top Side Tait Radio Modem (TOPx271A-T0) Service and Operation Manual PCB Information February 2004 © Tait Electronics Limited... -
Page 44: 228-22351-04 Pcb Bottom Side
228-22351-04 PCB Bottom Side PCB Information Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... - Page 45 228-22351-04 PCB Circuit Diagram (page 1 of 1) Tait Radio Modem (TOPx271A-T0) Service and Operation Manual PCB Information February 2004 © Tait Electronics Limited...
- Page 46 PCB Information Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 47: Xa2235-02-Pcb (Pcb Ipn 228-22352-01)
PLUG 9W DRNG 038-10000-00 RESISTOR 0603 0603 038-10000-00 RESISTOR 0603 0603 038-10000-00 RESISTOR 0603 0603 038-10000-00 RESISTOR 0603 0603 228-22352-01 PCB 9W DRNG to MICROMATCH Tait Radio Modem (TOPx271A-T0) Service and Operation Manual PCB Information February 2004 © Tait Electronics Limited... - Page 48 PCB Information Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 49: 228-22352-01-Pcb Top Side
228-22352-01-PCB Top Side 228-22352-01-PCB Bottom Side Tait Radio Modem (TOPx271A-T0) Service and Operation Manual PCB Information February 2004 © Tait Electronics Limited... - Page 50 PCB Information Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 51: Xa2235-02-Pcb Circuit Diagram
XA2235-02-PCB Circuit Diagram (page 1 of 1) Tait Radio Modem (TOPx271A-T0) Service and Operation Manual PCB Information February 2004 © Tait Electronics Limited... - Page 52 PCB Information Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 53: Main Top Pcb Modifications
Main TOP PCB Modifications In the Tait Radio Modem, the Main TOP PCB has been modified to support the TRM PCB. These modifications are described in the diagram and table that follow: 220E Modification Purpose 030-55100-20 10k and 220E resistors fitted to volume... - Page 54 PCB Information Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 55: Testing
Testing The tests described here are for testing and adjusting the XA2235-01-PCB PCB only. For testing and adjusting the Tait Orca Main PCB, see the standard TOP Service Manual. Note Calibration is factory set and should not need to be adjusted dur- ing servicing. -
Page 56: Test Rx Audio
Adjust RV3 to read -10dBm. Test Tx Audio Set Test Set to TX with the following settings AF Gen Freq: 1kHz AF Gen 1 level -10dBm Testing Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 57: Test Channel Selection
Reduce power supply voltage to below 8V Check that TRM shuts down (NOTE: Rx Audio stops) Increase voltage to 9V Check that TRM powers up (NOTE: Rx Audio is on) Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Testing February 2004 © Tait Electronics Limited... -
Page 58: Using The Voice Radio For Testing
Use it to listen to incoming data, regardless of the mode the TRM is operating in. Note During voice operation all standard Tait Orca features including Selcall and DTMF are available. See the online help in the pro- gramming software for more information. -
Page 59: Programming
Programming The programming application PGM S/W:TOPCPA provides an easy way of changing the Tait Radio Modem settings using a PC. Some settings are user-selectable and some are fixed. Minimum System Requirements The software application requires the following minimum configuration: an IBM-compatible PC with an 80486 microprocessor... -
Page 60: Installing The Software
Set up the TRM for programming according to the diagram in “Equipment Setup” on page 59. You will need to fill out the Channels form and the Data Parameters form described below. Programming Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 61: Economy Mode
8 channels. In Command mode the maximum number of channels is 510. Note The maximum number of channels possible is affected by the number of Selcall systems programmed. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Programming February 2004 © Tait Electronics Limited... -
Page 62: Channel Id
Once subaudible signalling has been assigned for a channel, if you wish to change the signalling type to CTCSS or DCS, first set either Rx or Tx field to NONE, then selected the required type of signalling. Programming Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 63: Tx Deviation
Selcall channels, for the duration of the SDM Wait of Acknowledgement. During this time FFSK data in the form of Short Data Messages can be decoded. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Programming February 2004 © Tait Electronics Limited... -
Page 64: Dtmf Id (Tx Only)
If this field is enabled, the TRM will power up in Transparent mode. If it is not enabled, the TRM will power up in Command mode. Programming Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 65: Transparent Mode Baud Rate
Inhibit CTS field should be unchecked. For more information see "Applications for RTS and CTS Signalling" the online help. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Programming February 2004 © Tait Electronics Limited... -
Page 66: Applications For Rts And Cts Signalling
When this field is enabled the TRM can send and receive short data messages (SDM) in Command mode. using the CCDI protocol. In Transparent mode the Tait TRM can receive, but not transmit SDMs. SDM Auto Acknowledge When this field is enabled, the TRM sends an auto acknowledge when it receives SDM messages. -
Page 67: Sdm Wait For Acknowledgement
When it is enabled, all incoming data transmissions are processed regardless of subaudible signalling. When disabled, the TRM only processes incoming FFSK data for which the subaudible signalling is valid. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Programming February 2004 © Tait Electronics Limited... - Page 68 Programming Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 69: Radio Modem Operation
Radio Modem Operation With both RS-232 and Audio Port interfaces, the Tait Radio Modem can operate in three configurations. These are: as a radio modem as an RF platform (see “RF Platform Operation” on page as a voice radio - used for testing only (see “Using the Voice Radio for... -
Page 70: Before Operating
Data flow is controlled either by the customer’s embedded computer system or by a PC running a data-sending application such as Hyperterminal. Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 71: Transparent Mode
Command mode is specified. If the TRM defaults to Transparent mode at power-up, the escape character is set to the default value of ‘+’. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Radio Modem Operation February 2004 © Tait Electronics Limited... -
Page 72: Transparent Mode Packetisation
..HEADER FFSK data Lead- 6 bytes max 46 bytes 2 bytes 6 bytes max 46 bytes 2 bytes (00) (00) Delay Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 73: Effective Data Rate
Data rate varies depending on the quantity of data. For example, assuming 460 byte data is being sent, with a Lead-In Delay of 100ms and Lead-Out Delay (tait Time) of 20ms, the effective data rate is calculated below. Note that these calculations are theoretical only as there are other real-life factors not being considered. - Page 74 Base Stations that need to be activated before any data is sent. Note The Lead-In Delay must also allow for subaudible signalling decoding, if it is enabled, when used in conjunction with FFSK data. Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 75: Command Mode
Command Mode Command mode uses Tait proprietary Computer Controlled Data Interface (CCDI), a command protocol embedded in the radio firmware. It is accessed using the RS-232 serial lines from the PC. The Command mode baud rate is fixed at 9600 bps. - Page 76 When the PC receives +++p0202CC in Transparent mode, “p0202CC’ is recognised as a message from a TRM but the TRM remains in Transparent mode. Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 77: Ccdi Command Format
CCDI Command Format The Tait Computer Controlled Data Interface (CCDI) protocol provides the means of controlling a TRM from a PC, to allow either a semi or fully automatic communications system. CCDI is embedded in the radio software, and accessed via the serial lines on the programming lead between the PC and the TRM. -
Page 78: Calculating The Ccdi [Checksum]
26h = 0010 0110 two’s complement = 1101 1010 Convert the binary number into two ASCII hex digits, MSD first. 1101 1010 = DA Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited... -
Page 79: Ccdi Commands To The Tait Radio Modem
PC after the TRM completes the current transaction, to signify that another may begin. If an error arises, the PC is notified with an appropriate ERROR response. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Radio Modem Operation February 2004 © Tait Electronics Limited... - Page 80 Selcall dialling of the number 1 2 3 4 5. d0611234506 a command to initiate DTMF dialling of the number 1 2 3 4 5. Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
- Page 81 SDM. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Radio Modem Operation February 2004 © Tait Electronics Limited...
- Page 82 “activate transmitter” command. Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
- Page 83 TRM be put into Transparent mode. The “escape” character specified here is “z” (ASCII code = $7A). Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Radio Modem Operation February 2004 © Tait Electronics Limited...
- Page 84 Lead-In Delay through current channel. s0CFF12345678Hi39 This message transmits data identity “12345678” and SDM data “Hi” with 5.1 sec Lead-In Delay through current channel. Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 85: Ccdi Commands From The Tait Radio Modem
In all cases, the prompt character ‘.’ will be sent after the TM8100 message, to terminate the transaction and signify that another may begin. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Radio Modem Operation February 2004 © Tait Electronics Limited... - Page 86 “.” is sent from TRM. Communication Failure Communication failure errors encompass all low level mechanisms, i.e. framing error, overrun error, parity error etc. Fatal system error - contact Tait Techncial Support (Sytsem Error) An example of the ERROR response message is: e03003A5 This message indicates that the parameters of current received message are incorrect.
- Page 87 TOP Orca Mobile conventional unit [RUTIER] is a single character representing the tier of the TRM. Char Function Tait Orca Elan radio (standard unit used in TOP Orca Conventional) Tait Orca Excel radio Tait Orca Eclipse radio Tait Orca 5010/5011 radio...
- Page 88 [CALLER_ID] part is missed or not. An example of a RING response message is: r0714000FFA6 This message indicates that the received call is an SDM call. Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
- Page 89 The PTT has been released. This message will be sent whenever the PTT is released after attempting to transmit. 09 - 15 Reserved for trunked radios Selcall Retry Radio Stunned Radio Revived Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Radio Modem Operation February 2004 © Tait Electronics Limited...
- Page 90 An example of a PROGRESS response message would be: p0202CC This message sends the progress message to say that Tx has been inhibited. Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
- Page 91 This message indicates that the TRM has no SDM data available. s02Hi7A This message indicates that the TRM has a valid SDM data “Hi”. Tait Radio Modem (TOPx271A-T0) Service and Operation Manual Radio Modem Operation February 2004 © Tait Electronics Limited...
- Page 92 Radio Modem Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...
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Page 93: Rf Platform Operation
RF Platform Operation Before Operating By connecting an external radio-configured modem to the audio port, the Tait Radio Modem can be used as an RF platform to transmit FFSK signalling. Before operating, set the following: Either flat or pre/de-emphasised audio at -10dBm Select via SW1 DIP Switches. -
Page 94: Timing
TRM and recovered audio and Rx Gate on a receiving TRM. FM Noise Recovered flat audio Rx Gate t =0 ¹ t 45ms £ ² t £85ms RF Platform Operation Tait Radio Modem (TOPx271A-T0) Service and Operation Manual February 2004 © Tait Electronics Limited...