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Receiver Antennas for Synchronized Watches and Ripple Control Applications

Fri, 06/11/2010 - 7:39am
PREMO enhances its receiver antennas range with the new RCA-ROD series (radio clock antenna), an antenna for synchronized clocks and ripple control (tariff switching, public lighting control, smart metering, etc.), which consist into a parallel resonant tank.

The RCA-ROD antenna can be set and tuned in different frequencies from 40kHz to 139kHz, for clock applications (synchronization with atomic clock, 40 and 60 kHz in Japan, 77.5 kHz in Germany, etc.) and power control and management applications (tariff switching and load management), lighting controls, smart metering, etc.

There are several clock signal and long wave transmitters for the power control (radio ripple control): DCF77-77.5 kHz(Germany), HBG-75 kHz (Switzerland), MSF-60 kHz (United Kingdom), JJY-40&60 kHz (Japan), WWVB-60 kHz (USA), DCF49 (Germany): 129,1 kHz (Mainfligen transmitter, 100 kW), y 139 kHz (Burg transmitter, 50 kW), 135,6 kHz (Laikhegy, Hungary, transmitter 100 kW) to cover different zones.

These long wave transmitters use FSK modulation with frequency precision of +/- 107 Hz and signal speed of 200 Bd.

In a precision receiver antenna design configured with a resonant tank is very important the quality factor of the circuit, which is a combination of the "Q" of the coil and "Q" of the capacitor. The higher is the quality factor, the more sensitivity will have the signal reception of the antenna. (f.e.m will be increased in the tank), but on the contrary, the bandwidth of the resonant circuit becomes narrower. So, small variations in the inductance (L) or capacity (C) could cause a shift in the operating frequency and therefore a significant loss of receiving signal; thus compromise is established of quality factor "Q" to assure the proper operation of the antenna: 60-90.

100% of PREMO antennas are tuned in the manufacturing chain in the required operating frequency, with a bandwidth around +/- 500 Hz. They use as ferrite cores as capacitors highly stable in temperature with low noise factor, so the antenna maintains its parameters between -40ºC and +70ºC.

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