Radiometrix
Hartcran House, Gibbs Couch, Watford, WD19 5EZ, England
Issue 3, 13 April 2001
Tel: +44 (0) 20 8428 1220, Fax: +44 (0) 20 8428
SILRX-UHF
UHF Radio Telemetry Receiver Module
UK version:
Euro version:
SILRX-418-5 / SILRX-418-10
SILRX-433-5 / SILRX-433-10
The SILRX-418-5 and SILRX-433-5 integrate a
complete FM superhet UHF radio receiver on a
small module. Together with the matching TXM-
418-5 or TXM-433-5 transmitter a one-way radio
data link can be achieved over a distance upto 200
metres on open ground
Typical features include:
•
PCB mounting, space saving SIL style
•
418 MHz SAW controlled wide band FM reception
•
Selective double conversion superhet
•
Sensitive typ. 0.5µV (-113 dBm) for 20 dB S/N
•
High data rates, 5kbps and 10kbps
•
Analogue and Digital data outputs
•
Carrier detect output
•
Fast enable time,< 3ms for duty cycle power save use
•
Wide supply range, 4.0V to 9.0V
•
Low current, 13 mA continuous, 130µA on power save (100:1)
•
The SILRX radio receiver and the matching DTI (RA) approved transmitter (TXM-418-5) are self
contained, PCB mounting modules capable of transferring analogue or digital data up to a distance
of 200m.
The SILRX receiver module is particularly suitable for battery powered portable applications where it’s
low power requirements and small size are of advantage. It may also be used as a lower cost option to
the RXM-418-10 in fixed applications where the higher data rates and signal strength output of the
RXM-418-10 are not required.
Typical applications include:-
Site paging receivers
Line powered telephone auto diallers
Guard patrol/lone worker protection
Mobile panic attack
Battery powered half duplex data networks
Lighting control, Garage door openers
Picture/antique protection alarms
Radiometrix Ltd, SILRX-UHF Data Sheet
left: TXM-418-5 transmitter right: SILRX-418-5 receiver
Paging car alarms
Domestic and commercial security
Medical Alert/Nurse Call system
Remote industrial process monitoring
Data transfer through hazardous environments
Fire alarms
Remote control, Access control
page 1
Brief description
The SILRX receiver is a double conversion FM superhet with a data slicer driven by the AF output.
Additionally a fast acting carrier detect signal is available to indicate to external circuits that a signal is
present. This signal is extremely useful when implementing duty cycle power save circuits (see fig 4) or
to indicate to external logic that a signal is being received. It is internally derived from the degree of
noise quieting due to the presence of a receive carrier.
The SILRX-418 is designed to work with the matching transmitter (TXM-418). With the addition of
simple antenna the pair may be used to transfer serial data up to 200m. The range of the radio link is
very variable and depends upon many factors, principally, the type of antenna employed and the
operating environment. The 200m quoted range is a reliable operating distance over open ground using
1/4 whip antenna at both ends of the link at 1.5m above ground. Smaller antenna, interference or
obstacles (e.g. building etc.) will reduce the reliable working range (down to 30m in extreme cases).
Increased antenna height, slow data or a larger receive antenna will increase the range (our best is
3km).
We recommend that the module evaluation kit, EVAL-418-A, can be used to assess the reliable working
range under the anticipated conditions of use.
The following figure shows the receiver’s block diagram.
figure 1: Block diagram
figure 2: Test cicuit
Radiometrix Ltd, SILRX-UHF Data Sheet
page 2
Pin Description
pin
pin
pin
1
2
3
RF IN
RF GROUND
DETECT
The receiver antenna connects to this input. It has nominal RF
impedance of 50Ω and is capacitively isolated from the internal circuit
This pin should be connected to any ground plane against which the
antenna works. It is internally connected to pin 4.
This pin may be used to derive a carrier detect to enable external circuits
when a signal is being received. If the detect function is not being used a
10 kΩ pull-up to pin 5 (Vcc) should be connected. Refer to applications
note for further details on the use of this pin.
Ground for supply.
Positive supply of 4V to 9V 13 mA. The supply must be clean (<2mV pp)
stable and free of high frequency digital noise. A supply filter is
recommended unless the module is driven from it’s own regulated supply.
This is the FM demodulator output. It has an standing DC bias of
approximately 1.4V and may be used to drive analogue data detectors
such as modem chips or DTMF decoders. Load impedances as low as 2 kΩ
and up to 100 pF can be driven
This digital output from the internal data slicer is a squared version of
the signal on pin 6 (AF) This signal is used to drive external digital
decoders, it is true data (i.e. as fed to the transmitters data input). Load
impedances as low as 1 kΩ and up to 1 nF can be driven
pin
pin
4
5
0 volt
Vcc
pin
6
AF
pin
7
DATA
.
figure 3: Mechanical Dimensions:
Radiometrix Ltd, SILRX-UHF Data Sheet
page 3
Performance data SILRX-418-5 and SILRX-433-5
ambient temperature: 20°C
supply voltage:
test circuit:
+ 5 Volt
fig. 2
Parameter
Operating voltage range (Vcc)
Supply current
Receive frequency
Overall frequency accuracy
Sensitivity for 20 dB S/N
Carrier detect, threshold
RF input impedance
IF bandwidth
AF output level
AF bandwidth
Frequency/voltage conversion
pin 6
pin 6
pin 6
pin 1
pin 1
pin 1
pin 5
pin 5
Min.
4.0
11
-
- 100
-
-
-
-
-
DC
-
Typical
5.0
14
433.92
0
0.5
0.5
50
250
500
-
10
Max.
9.0
17
-
+ 100
1.0
2.0
-
-
-
5
-
Units
V
mA
MHz
kHz
µV
µV
Ω
kHz
mV
pp
kHz
mV/kHz
Notes
-
-
-
1
2
-
-
3
2, 3
3
-
Data output, Logic low
Logic high
Data bit duration
Data Mark:Space
Data settling time
(minimum preamble duration)
Enable time
Signal detect time
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
pin 7
pin 7
0
4.0
0.2
20 %
0.2
4.5
-
-
-
0.8
5
20
80 %
15
V
V
ms
4
5
6
7
pin 7
-
ms
8
pin 3
pin 3
over supply and temperature range
±25kHz
deviation, 1 kHz tone
3µV input
1mA sink
1mA source
time between transitions
-
-
-
-
2.5
0.5
ms
ms
3, 9
3, 9
(time high / time low) * 100 %, averaged over any 20 ms period
time from valid carrier detect to stable data output
from application of supply to carrier detect low (active)
from application of signal to carrier detect low (active)
Absolute maximum ratings:
Supply voltage Vcc, pin 5
Operating temperature
Storage temperature
RF input, pin 1
Any input or output pin
- 0.3
- 0.3
- 10°C
- 40°C
to
to
to
0 dBm
to
Vcc V,
±10
mA
+ 10
+ 50°C
+ 100°C
V
Radiometrix Ltd, SILRX-UHF Data Sheet
page 4
Performance data SILRX-418-10 and SILRX-433-10
ambient temperature: 20°C
supply voltage:
test circuit:
+5V
fig. 2
Parameter
Operating voltage range (Vcc)
Supply current
Receive frequency
Overall frequency accuracy
Sensitivity for 20 dB S/N
Carrier detect, threshold
RF input impedance
IF bandwidth
AF output level
AF bandwidth
Frequency/voltage conversion
pin 6
pin 6
pin 6
pin 1
pin 1
pin 1
pin 5
pin 5
Min.
4.0
11
-
- 100
-
-
-
-
-
DC
-
Typical
5.0
14
433.92
0
1.0
2.0
50
250
500
-
10
Max.
9.0
17
-
+ 100
2.0
4.0
-
-
-
20
-
Units
V
mA
MHz
kHz
µV
µV
Ω
kHz
mV
pp
kHz
mV/kHz
Notes
-
-
-
1
2
-
-
3
2, 3
3
-
Data output, Logic low
Logic high
Data bit duration
Data Mark:Space
Data settling time
(minimum preamble duration)
Enable time
Signal detect time
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
pin 7
pin 7
0
4.0
0.05
20 %
0.2
4.5
-
-
-
0.8
5
2
80 %
5
V
V
ms
4
5
6
7
pin 7
-
ms
8
pin 3
pin 3
over supply and temperature range
±25
kHz deviation, 1 kHz tone
3
µV
input
1mA sink
1mA source
time between transitions
-
-
-
-
1
0.3
ms
ms
3, 9
3, 10
(time high / time low) * 100 %, averaged over any 20 ms period
time from valid carrier detect to stable data output
from application of supply to carrier detect low (active)
from application of signal to carrier detect low (active)
Absolute maximum ratings:
Supply voltage Vcc, pin 5
Operating temperature
Storage temperature
RF input, pin 1
Any input or output pin
- 0.3
- 0.3
- 10°C
- 40°C
to
to
to
0 dBm
to
Vcc V,
±10
mA
+ 10
+ 50°C
+ 100°C
V
Radiometrix Ltd, SILRX-UHF Data Sheet
page 5
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