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HVR2
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The HVR2 receiver is the high vibration
resistant version of the low cost RLC2 receiver. Its unique
local oscillator design makes the unit almost immune to
mechanical vibrations below 500Hz. This makes the HVR2 (with
the matching TLC2 transmitter) to be used in mechanically
troublesome areas such as crane and machine tool control,
and remote operated vehicles.
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Figure 1: HVR2-433-5/TLC2-433-5
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Conforms to
EN 300 220-3 and EN 301 489-3
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High performance
double superhet, PLL synthesizer with TCXO
- DDS local oscillator
- SAW front end filter
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Data rates up
to 5 kbps for standard module
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Usable range
over 500m
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Fully screened.
Low profile
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Feature-rich
interface (RSSI, analogue and digital baseband)
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Re-programmable
via RS232 interface
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Low power requirements
- Immunity to mechnical vibration up
to 500Hz
Applications
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Handheld terminals
- Heavy vehicle/machinery (e.g. crane)
controls
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EPOS equipment,
barcode scanners
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Data loggers
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Industrial telemetry
and telecommand
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In-building
environmental monitoring and control
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High-end security
and fire alarms
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DGPS systems
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Vehicle data
up/download
Technical Summary
- Operating frequency: 433.875-434.650MHz
- Any custom frequency on 433.05 - 434.775MHz
- 32 channels
- Supply range: 3.7-15V
- Current consumption: 30mA
- Data bit rate: 5kbps max.
- Receiver sensitivity -118dBm (for
12dB SINAD)
- Serial configuration by inverted RS232
at 3V CMOS level
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| Evaluation
Platform: Narrow
Band Evaluation Kit |
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Figure 4: HVR2 block diagram |
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Figure 5: HVR2 Footprint (Top view) |
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| Pin Description |
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Pin
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Name
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Function
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| 1 |
Vcc |
DC supply (3.7V to 15V, at
30mA). |
| 2 |
RSSI |
0.5V-2.5V DC; 60dB dynamic
range; 40kW output impedance |
| 3 |
0V |
Ground |
| 4 |
RXD |
Open collector digital data
output with internal 47kW pull-up
to Vcc |
| 5 |
AF out |
600mV pk-pk audio. DC coupled,
approximately 0.8VDC bias |
| P0/PGM |
Parallel channel select pins
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Channel select bit 0, True
logic (0V = low). Weak pullup to 3.5V
(also used for Serial frequency programming / configuration) |
| P1 |
Channel select bit 1, True
logic (0V = low). Weak pullup to 3.5V |
| P2 |
Channel select bit 2, True
logic (0V = low). Weak pullup to 3.5V |
| P3 |
Channel select bit 3, True logic (0V =
low). Weak pullup to 3.5V |
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NOTES:
1. Serial programming is by a 2400 baud inverted
'RS232' (3V CMOS levels) datastream applied to the P0 pin. If
connection to a true RS232 port is desired, then a suitable inverting
level shifter / buffer (MAX232 or NPN switch transistor) is needed.
2. Parallel channel select is by a 4 pin parallel input. 3V CMOS
levels should be used.
3. As supplied the frequency table is thus:
ch
0-15 433.875 - 434.625 MHz
(50KHz steps)
ch
16-31 433.9 - 434.65 MHz (50KHz steps)
Channels 00-15 cannot be accessed by the parallel
port , only by a serial GOCHAN command.
This format maintains compatibility with RLC2
radios (which are supplied with their P4 jumpers unfitted, therefore
accessing channels 16-31).
If no connection is made to the ports, the unit operates on channel
31 (434.65MHz).
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Serial interface commands
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| HVR2 frequency/channel
can be serially configured using HyperTerminal or any other terminal
program configured with following setup: |
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| 2400 baud RS232, 8
bit data, no parity, 1 start bit, 1 or 2 stop bits. No flow control |
| Serial data is sent
to the unit on one of the parallel channel select pins (P0). It
is very important that the unit does not 'decode' switch bounce
in ordinary operation as a command string, or spurious re-writing
of the EEPROM will result. For this reason the user must send the
16 character string ENABLESERIALMODE to fully enable the serial
command mode before sending any of the command strings listed below.
Command mode is disabled on power down, or on reception of a # character. |
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Owing to the complex nature of
the DDS programming in the HVR2, the user does not have direct access
to the synthesizer registers (as is the case in the simpler RLC2).
Instead, the user has a table of 32 channels (accessible by parallel
port, or by the GOCHAN command). Each of these channels can be assigned
to one of the HVR2's pre-set frequencies (433.05 - 434.775MHz)
(note: the parallel port accesses the higher 16 channels, from 16-31,
as if a '5th parallel select bit' is always high). |
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| GOCHAN aa |
Serial select
of channel aa (0 to 31) (stored in non-volatile EEPROM) |
| HOPPER nn |
Temporary select of frequency
number nn (0 to 69) |
| LOAD aa nn |
Set a frequency (nn) for channel
aa (channels 0 to 31) |
| RVALUE rrrr |
Set value for R register |
| SETPAR |
Channel selected
by 5 bit parallel inputs (4pins P0-P3 + P4 always high) |
| SETSER |
Channel selected by most recent
GOCHAN operation |
| <cr> |
Process entry |
| / |
Clear all buffers |
| # |
Disable command mode |
aa = a two digit channel
number from 00 to 31 (values 00-15 can only be selected by a GOCHAN
command)
nn= abstract 'frequency number' relating to one of the pre-set
operating frequency
Channel frequency = 433.05 + (nn x 0.025) MHz
For example:
nn = 01 relates to a channel frequency of 433.075MHz, and the
commnd:
LOAD 00 01 will set channel number 0 to 433.075MHz
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Notes:
A pause of at least 25ms must be allowed between command strings
(EEPROM programming time).
The HVR2 has no equivalent to the RLC2 'SINGLE' command. The 'HOPPER'
command provides some similarity, but on power up (or SETPAR,
SETSER or GOCHAN command) the radio reverts to ordinary operation.
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Condensed specifications
| Frequency |
433.05 - 434.775MHz
Custom variants on 433-435MHz |
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Frequency
stability
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+/- 1.5kHz |
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Channel
spacing
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25kHz |
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Number
of channels
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32 channels controlled via RS232 interface
or 16 channels by parallel port
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| Operating temperature |
-10 to +60 °C (Storage
-30 to +70 °C) |
| Spurious radiations |
Compliant with ETSI EN 300
220-3 and EN 301 489-3 |
| Interface user |
5pin 0.1" pitch molex |
Channel
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4pin 0.1" pitch molex |
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RF |
2pin 0.1" pitch molex |
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| Sensitivity |
-118dBm for
12 dB SINAD |
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-112dBm for 1 part per 1000
BER |
| image / spurious |
better than
-55dB |
| blocking |
better than -85dB |
| LO re-radiation |
-60dBm |
| adj. Channel |
better than -55dB (Tested
per. ETSI EN 301 489-3) |
| Supply |
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| Voltage |
3.7V - 15V |
| Current |
30mA |
| outputs |
RSSI, audio,
digital data |
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| Power on to
valid AF |
<10ms |
| Power on to
stable RXD |
<10ms
(for 50:50 mark / space) |
| Intended approval |
ETSI EN 300 220-3 (radio)
and EN 301 489-3 (EMC) |
| Notes: |
1. The data slicer cannot be depended upon for data
waveform frequencies below 250Hz
2. When RX is on and a transmitter keys up, again a 10ms
period is required to stabilise data output mark/space.
i.e. allow at least 10ms of preamble
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The
high vibration resistant HVR2 receiver differ from the Low Cost
RLC2 receiver in the following key features:
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HVR2 |
RLC2 |
| Frequency band |
433.05 - 434.775 |
433 - 435 MHz |
| Channels |
32 serial or 16parallel |
32 parallel/serial |
| Parallel channel select |
4 pins |
4 pins (and 1 jumper link) |
| Supply |
3.7-15V, 30mA |
3.7-15V, 18mA |
| Image / spurii / adj. chan |
<-55dB |
<-60dB |
| Ultimate S/N |
25dB (min), 30dB (typical) |
35dB (min), 40dB (typical) |
| Start up time (preamble) |
<10ms |
50ms |
| Channel to channel hop |
<5ms |
25ms |
| Reprogramming (frequency) |
Limited |
Full |
| Vibration resistant |
High, up to 500Hz |
Limited |
| Local Oscillator |
Direct Digital Synthesiser (DDS) |
Voltage Controlled (VCO) |
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| Antenna
requirements
Three types of integral antenna are recommended
and approved for use with the module:
A) Whip: This
is a wire, rod, PCB track or combination connected directly to
RF pin of the module. Optimum total length is 16cm (1/4 wave @
433MHz). Keep the open circuit (hot) end well away from metal
components to prevent serious de-tuning. Whips are ground plane
sensitive and will benefit from internal 1/4 wave earthed radial(s)
if the product is small and plastic cased
B) Helical:
Wire coil, connected directly to RF pin, open circuit at other
end. This antenna is very efficient given it's small size (20mm
x 4mm dia.). The helical is a high Q antenna, trim the wire length
or expand the coil for optimum results. The helical de-tunes badly
with proximity to other conductive objects.
C) Loop:
A loop of PCB track tuned by a fixed or variable capacitor to
ground at the 'hot' end and fed from RF pin at a point 20% from
the ground end. Loops have high immunity to proximity de-tuning.
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A
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B
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C
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Whip
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Helical
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Loop
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| Ultimate performance |
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| Easy of design set-up |
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| Size |
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***
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| Immunity proximity effects |
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***
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| Range open ground to similar
antenna |
500
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200
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100
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| The antenna
choice and position directly controls the system range. Keep it
clear of other metal in the system, particularly the 'hot' end.
The best position by far, is sticking out the top of the product.
This is often not desirable for practical/ergonomic reasons thus
a compromise may need to be reached. If an internal antenna must
be used, try to keep it away from other metal components, particularly
large ones like transformers, batteries and PCB tracks/earth plane.
The space around the antenna is as important as the antenna itself. |
Figure 6: Antenna types
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| Ordering
Information |
| Part No. |
Description |
Frequency
band (MHz) |
| TLC2-433-5 |
UHF multi channel narrow band
FM transmitter |
433.875 - 434.650 |
| HVR2-433-5 |
UHF multi channel narrow band
FM receiver |
433.875 - 434.650 |
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Limitation of liability
The information furnished by Radiometrix
Ltd is believed to be accurate and reliable. Radiometrix Ltd
reserves the right to make changes or improvements in the design,
specification or manufacture of its subassembly products without
notice. Radiometrix Ltd does not assume any liability arising
from the application or use of any product or circuit described
herein, nor for any infringements of patents or other rights
of third parties which may result from the use of its products.
This data sheet neither states nor implies warranty of any kind,
including fitness for any particular application. These radio
devices may be subject to radio interference and may not function
as intended if interference is present. We do NOT recommend
their use for life critical applications.
The Intrastat commodity code for all our modules is: 8542 6000.
R&TTE Directive
After 7 April 2001 the manufacturer can only
place finished product on the market under the provisions of
the R&TTE Directive. Equipment within the scope of the R&TTE
Directive may demonstrate compliance to the essential requirements
specified in Article 3 of the Directive, as appropriate to the
particular equipment.
Further details are available on The Office of Communications
(Ofcom) web site:
Licensing
policy manual
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