C

ar Radio Optical Link
The unique replacement for Coaxial cable in Automotive EMI Applications
Low Loss/Noise ● High Dynamic Range ● Single or Eight Channel
The RadiLink® system is typically used to replace coaxial connections in RF
measurements. Where coaxial cables introduce losses that increase with
frequency and length of the cable, the RadiLink® provides a stable RF-link
with little frequency response. Furthermore common mode currents, running
through shields of coaxial cables, are eliminated by the use of a fibre system.
The Car Radio Link is a special version designed for Automotive emission
measurements of car antennae signals.
One- or Eight channel Car Radio Link
The Car Radio Link system consists of two parts; a RadiLink® plug-in card for
the RadiCentre® system that acts as a receive unit. The Car Radio Dummy
(remote) unit is mounted in a ruggedized aluminium enclosure. This Car Radio
Dummy is available as a single input or eight inputs version. The eight channel
version has a build-in 8 channel RF-switch which allows automatic selection of
different measurement antennae in the car. Each channel can deliver up to
200mA of bias current to power active antennae. In addition the Car Radio
Dummy is equipped with two DC-inputs to measure the switched supply
(Radio) and the ignition signal from the car.
CISPR 25 Compliant
The Car Radio Optical Link is compliant to the CISPR25 standard version 3
paragraph 5 ‘measurement of emissions received by an antenna on the same
vehicle’ and has a frequency range of 9 kHz to 3 GHz covering different
antenna signals including AM broadcast (150 kHz to 6.2 MHz), FM broadcast
(76 MHz to 108 MHz) and mobile services (26 MHz to 2.5 GHz).
High Dynamic Range
With regular fibre links the dynamic range is often too low for use in CISPR 25
EMI applications. The Car Radio Optical Link provides an unprecedented 80
dB dynamic range. In fact the high dynamic range in combination with the low
loss makes most measurement receivers perform much better.
Low Noise
The Car Radio Optical Link has an extremely low noise figure, resulting in a
noise floor of typical -10 dBµV @ 9kHz RBW. This enables the engineer to
measure peak and quasi peak measurements in the same set-up.

Dijkstra Advice, Research & EMC Instruments B.V.
Vijzelmolenlaan 7 – NL-3447 GX Woerden
The Netherlands
Tel: +31(0)348 41 65 92
Fax: +31 (0348) 49 97 32
Internet: www.dare.nl
E-mail: instruments@dare.nl

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and Training in EMC and Product Safety

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Cover great distances
Unlike coaxial cables fibre cables provide almost no loss. The Car Radio
Optical Link has an internal circuit allowing compensation for very long lengths
(to 100 m). This makes it the perfect product for laboratories with large
distances between the control room and the antenna in the anechoic chamber.
Emission applications
Emission applications have typically low signal strengths. By applying the
receiving side to the antenna the maximum signal is converted in to light and
transferred to the measurement receiver without loss.
Options
The Car Radio Dummy can be delivered with an optional Li-Po 12VDC battery
for standalone operation. The single channel version optionally can be delivered
with an N-type connector instead of the SMA-type connector.