EVAL-418-A Просмотр технического описания (PDF) - Radiometrix Ltd

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EVAL-418-A

UHF Radio Telemetry Receiver Module

Radiometrix Ltd 

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

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