HBC radiomatic TC695 Transceiver Module User Manual UM TC695 V1 0
HBC-radiomatic GmbH Transceiver Module UM TC695 V1 0
User Manual
User Manual
Transceiver Module TC695
UM-TC695-V1-0.DOC [ Word 2000 ] sedh/dous Page 1 / 6
HBC-radiomatic GmbH • 74564 Crailsheim • Germany
Information and specifications subject to change without notice. 2004-12-15
www.hbc-radiomatic.com
HBC – Transceiver Module
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User Manual
Transceiver Module TC695
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HBC-radiomatic GmbH • 74564 Crailsheim • Germany
2004-12-15 Information and specifications subject to change without notice.
www.hbc-radiomatic.com
Manufactured by: HBC-radiomatic GmbH
Haller Strasse 47 – 53
74564 Crailsheim, Germany
Telephone: +49 ( 0 ) 79 51 – 3 93 – 0
Fax: +49 ( 0 ) 79 51 – 3 93 – 50
E-mail: info@radiomatic.com
http://www.hbc-radiomatic.com
HBC-radiomatic GmbH is not liable for any misprints or errors! – All rights reserved.
™ HBC-radiomatic is a registered German trademark.
© 2004 – 12 , HBC-radiomatic GmbH , 74564 Crailsheim , Germany
No part of any software or of the present document may be reproduced in any manner whatsoever without the expressed
written permission of HBC-radiomatic GmbH.
User Manual
Transceiver Module TC695
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HBC-radiomatic GmbH • 74564 Crailsheim • Germany
Information and specifications subject to change without notice. 2004-12-15
www.hbc-radiomatic.com
Table of Contents
Warnings ........................................................................ 4
Function description of the TC695................................. 5
Technical Data................................................................ 8
Appendix:
Block diagram
User Manual
Transceiver Module TC695
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HBC-radiomatic GmbH • 74564 Crailsheim • Germany
2004-12-15 Information and specifications subject to change without notice.
www.hbc-radiomatic.com
Warnings
This device complies with part 15 of the FCC rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference and (2) this device
must accept any interference received, including interference that may cause undesired
operation.
Caution: Any changes or modifications by the user could void the user’s authority to
operate the equipment!
NOTE: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate frequency energy and, if not installed in
accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
User Manual
Transceiver Module TC695
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HBC-radiomatic GmbH • 74564 Crailsheim • Germany
Information and specifications subject to change without notice. 2004-12-15
www.hbc-radiomatic.com
Function description of the TC695
UHF transceiver for data transfer.
Consisting of:
1 General
2 First receiver
3 Second receiver
4 Transmitter
1 General:
The TC695 is a UHF transceiver with fast transmit-receive switchover and 2 independent
receivers. The frequency range is 902 – 917 MHz, according to the hardware version.
The operating voltage is 5.6-7.2 Volts for battery-operated units with five 1.2V cells. Two
internal stabilized voltages of 3 V via U3 and 5 V via U9 are generated from the input
operating voltage. After switching on (operating voltage supplied) the transceiver can be
changed between 2 operating modes. Multipoint connector ST2 Pin 9.
Mode 1 Manual: In this mode the transceiver can be changed over manually between
transmitting and receiving, as well as 128 frequencies via the address lines A0-A6. This
mode is preferred for alignment and testing purposes.
Mode 2 Auto: In this mode all settings from manual mode can be carried out serially via
SPI (Multipoint connector ST2 Pins 5-7). The transmission protocol can be found in the
alignment instructions.
The transmit-receive switchover (PTT) can be carried out at ST2 PIN 8 in manual or
automatic mode with a normal switch or TTL level.
2 Receiver 1 (user data receiver):
2.1 Preamplifier
The receiver operates according to the double superheterodyne system. The transceiver
has a switching bandwidth of about 5 MHz. After the antenna jack (ST1) the received
signal arrives in a 2-circuit band filter for the management of the preselection. Via the
antenna changeover switch U2 the received signal arrives at the entry to the preamplifier
U7, which amplifies the input signal by about 22dB. At the output the received signal
passes via the transmit-receive switch U5 to a further preselection by means of a 4-pin
spiral circuit filter FI1 and FI2.
2.2 First mixer
The input signal coming from the preamplifier arrives at the input (RF) of the first mixer
MI1. The oscillator is fed with a power of about 6dBm at the input of MI1 (LO). The first
oscillator (LO) generates from VCO 1 a frequency which is below the input frequency
(45 MHz) by the difference of the first IF.
User Manual
Transceiver Module TC695
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HBC-radiomatic GmbH • 74564 Crailsheim • Germany
2004-12-15 Information and specifications subject to change without notice.
www.hbc-radiomatic.com
2.3 Oscillator and frequency synthesizer
The VCO1 generates the first oscillator frequency with a power of about 0 dBm. With Q1
the signal is amplified to about 6dBm. A portion of the amplitude of the oscillator signal
is led back to the double synthesizer U8 via the voltage divider R29-R32 for reference
voltage formation. The synthesizer U8 is fed with 12.8 MHz via a highly stable (+-2ppm -
30/+70 deg. Celsius) clock source (TCXO1). The control voltage thus generated is led to
the oscillator VCO1 via the loop filter at the output of U8 (D01) and hence determines
the frequency stability of the VCO. The frequency setting is carried out with the help of
the microcontroller U14. The frequency data is read in via the lines DATA, CLOCK and
LE.
2.4 First IF 45 MHz
From the mixer output MI1 (IF), the input signal, which is now mixed to 45 MHz, passes
via the transmit-receive switch U6 into the first IF amplifier Q8 . The 4-pin quartz filter
XF2 located at the output of Q8 generates the channel selection with a bandwidth of
25kHz. The received signal then continues to the input of the 2nd mixer and the 2nd IF
preamplifier U12.
2.5 Second IF 455 kHz and RSSI
The received signal travels via the input RFin to the second mixer and is mixed with the
internal quartz oscillator XT4 44.545 MHz to the second IF of 455 kHz. Here the
receiving signal is further amplified and selected with 2 further band filters (FI5 and FI7).
The IF signal is demodulated with the demodulator circuit L10 and the integrated
quadrature demodulator and is then available as a LF signal and AFout of U12. At the
RSSIout output of U12 a voltage value RSSI (Radio Signal Strength Indicator) is issued,
similar to the input field strength, which goes into microprocessor U14 via RE2 for
further processing.
2.6 LF signal
After removing the HF residues (455 kHz) through a passive low-pass filter (R63, C132,
R51 and C115) the LF signal still travels through a digital low-pass filter to be amplified
again in U13. The max. LF pass frequency is 5 kHz. This LF output signal is now
available at Pin 18 (AF-out) on multipoint connector ST2 of the transceiver with an
adjustable voltage of 0.2 – 2 Volt (RE5).
3 Receiver 2 (scanner receiver):
3.1 The function of the 2nd receiver largely corresponds with that of receiver 1, 2.1-2.6,
with the difference that the second IF 21.4 MHz and the VCO2 frequency vary by the
difference of the 2nd IF above the input frequency. During reception, the second receiver
searches for the occupancy data of the frequencies. The 2nd receiver requires about 3
seconds for the process of scanning 67 frequencies. The field strength data for each
respective HF channel is issued via the Pin RSSIout, U11 for further processing on the
microprocessor. The field strength data on the frequencies is available via RS232 at St2
PIN 1 (TXD) for further processing (e.g. TC6X5 spectrum monitor)
User Manual
Transceiver Module TC695
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HBC-radiomatic GmbH • 74564 Crailsheim • Germany
Information and specifications subject to change without notice. 2004-12-15
www.hbc-radiomatic.com
3 Transmitter:
3.1 Transmission oscillator
The transmitter operates according to the mixing principle. Transmission oscillator Q10
generates the frequency 45 MHz with the quartz oscillator XT3 and is amplified via Q5
and Q6 to about 10 dBm and then travels via the transmit-receive switch U6 to the mixer
MI1
3.2 Mixer
Mixer MI1 operates in reverse mode (all ports RF, IF and LO can be operated in reverse)
and generates from the oscillator frequency of 45 MHz and the VCO1 (LO) frequency the
mixed product of the end frequency (e.g. 902…MHz) and in the case of transmission is
available with about 1dBm at port RF (MI1) for further amplification.
3.3 Transmission amplifier and output stage
The transmission signal is led via the two spiral circuit filters FI1 und FI2 to the transmit-
receive switchover U5. Here the transmission signal is amplified with U 3 and U1 to
about 16dBm and then travels via the antenna changeover switch U2 and the spiral
circuit filters FI 4 to the antenna connection ST1.
User Manual
Transceiver Module TC695
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HBC-radiomatic GmbH • 74564 Crailsheim • Germany
2004-12-15 Information and specifications subject to change without notice.
www.hbc-radiomatic.com
Technical Data
Common data (RX+TX):
Frequency range: 902.025 ... 918.000 MHz
Operating voltage: 5.6 ... 7.2 V
Channel pattern: 25 kHz
LF transmission bandwidth: 150 Hz .... 4.8 kHz
Modulation type: F9D
Operating temperature range: -30 ... +70 °C
Transmitter:
Output power: +10 dBm
Frequency deviation: +/- 5 kHz
Current consumption when transmitting: 140 mA
Switch-over time (RX-TX): < 300 µs
Receiver 1 (traffic channel receiver):
Sensitivity: -107 dBm (20dB S/N)
First IF: 45 MHz
Second IF: 455 kHz
Current consumption when receiving: 75 mA
Switch-over time (TX-RX): < 300 µs
LF output voltage: 150 mV RMS at +/-5 kHz deviation
Receiver 2 (scanner receiver):
Sensitivity: -107 dBm (20dB S/N)
First IF: 21.4 MHz
Second IF: 455 kHz
Current consumption: 20 mA
Measure channel changeover time with field strength < 30 ms
Transceiver operating modes:
Manual
After applying the operating voltage the frequency can be set with the address lines
A0 ... A6 and the unit can be switched over from receive to transmit with the PTT line.
The field strength data of all scanned RF channels is available at TXD (RS232) (can be
displayed with the PC program: Database field strength, dwell time, stored maximum
field strength for each RF channel, installation software on HBC
G: HFE/TC695/TC695.EXE).
Automatic
After applying the operating voltage the transceiver issues its identity code, consisting of
an 8 byte string, every 30 msec to the SPI (MOSI, SS and CLK). The default data
transmission rate is 125 kBit/sec (adjustable up to 1 Mbit/s SW). The default data
receiving rate is up to 1 Mbit/sec. After the first valid response to the cyclic transmission
of the ID code the transceiver only reacts to a request from the other end. Time between
request and response to the SPI about 300 µSek.
User Manual
Transceiver Module TC695
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HBC-radiomatic GmbH • 74564 Crailsheim • Germany
Information and specifications subject to change without notice. 2004-12-15
www.hbc-radiomatic.com
Request options at TC695:
1. Byte: IdentByte = h72 (ID code for TC695 transceiver)
2. Byte: Number of bytes in this string (HBC protocol agreement) = h07
3. Byte: Operating RF channel = 0xx ( up to max. h7F)
4. Byte: State what should be contained in the next string? h00 = Request for IniString
every 30 msec, h01 = Request for no answer, h02 = Request for 8 byte string (standard
string with field strength of traffic channel), h03 = Request for 74 byte string (standard
string with field strength of traffic channel + field strength values of all RF channels in
the block – ReNEW time of data for 67 channels approx. 2.5 sec)
5. Byte: Not used yet
6. Byte: Block check (sum)
Request responses from TC695:
1. Byte: IdentByte = h72 (ID code for TC695 transceiver)
2. Byte: Number of bytes in this string (HBC protocol agreement) = h07 (without block
check byte).
3. Byte: RF block
W4 (h09) Block 902.025 – 905.200 MHz maximum number of channels = 128
W5 (h0a) Block 905.225 – 908.400 MHz maximum number of channels = 128
W6 (h0b) Block 908.425 – 911.600 MHz maximum number of channels = 128
W7 (h0c) Block 911.625 – 914.800 MHz maximum number of channels = 128
W8 (h0d) Block 914.825 – 918.000 MHz maximum number of channels = 128
(6LSB) = h06 and channel pattern (2MSB) default 25kHz channel pattern = b00xxxxxx
4. Byte: Maximum number of channels in block = d128 h7F (128 channels)
5. Byte: Momentary traffic channel = hxx (max h7F)
6. Byte: Status (request status) h00 = Cyclic inistring, h01= No response, h02= Short
response (includes field strength of traffic channel) h03=Long response (includes field
strength of traffic channel and all channels found in the block). The status byte is reset
to h01 after receipt and execution of the commands. Frequency changing is possible
with all requests.
7. Byte: Field strength of traffic channel = hxx
8. Byte: 8 bit block check (sum)
User Manual
Transceiver Module TC695
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HBC-radiomatic GmbH • 74564 Crailsheim • Germany
2004-12-15 Information and specifications subject to change without notice.
www.hbc-radiomatic.com