RPC-418-5 RADIOMETRIX [Radiometrix Ltd], RPC-418-5 Datasheet - Page 9

• Manufacturer Part Number: RPC-418-5
• Description: UHF Radio Telemetry Receiver Module
• Manufacturer: RADIOMETRIX [Radiometrix Ltd]

AF output
This output is the FM demodulator’s output after buffering and filtering. Since it is taken before the
data slicer in the module, it may be used to drive external data slicers / demodulator’s in cases where
the internal data slicer is not suitable. This is the case where an analogue subcarrier is being employed
e.g. 2 tone AFSK or DTMF tones. In these cases the AF output is used to drive the FSK / DTMF decoder
directly.
The AF output is also a very useful test point for monitoring signals or interference. The AF output is
DC coupled to the FM demodulator thus the DC level Varies with the frequency of the incoming signal.
Supply requirements
The module requires a clean supply. Noise and ‘hash’ in the 5 to 500 kHz band and 16 MHz ±1 MHz
must be less than 2 mV, We recommend a 10 µF capacitor to ground on pin 5 (Vcc) and a 10Ω series feed
resistor in cases where the cleanness of the supply is in doubt.
.
Additional Reading
BS 0799
BS 4737
MPT1340
Trade
ARRL Handbook
ARRL Antenna Book
Radiometrix Ltd, SILRX-UHF Data Sheet
Warning:
Don’t be tempted to adjust the trimmer on the module, it controls the receive
frequency and can only be correctly set-up with an accurate RF signal generator!
British standard for Wire-free intruder alarm systems
British standard for intruder alarm systems in buildings from British standards
institution - Tel. [phone]
DTI type approval specification for 418 MHz Telemetry from department of
and Industry - 44 171 211 0502/0505
Excellent radio engineering text
Practical antenna design book
page 9