Receiver antennas for synchronized watches and ripple control applications

PREMO enhances its receiver antennasrange with the new RCA-ROD series (radio clock antenna), an antenna forsynchronized clocks and ripple control (tariff switching, public lighting control, smart metering,etc.), which consist into a parallel resonant tank.

The ferrite corestandard dimension is 10x40mm. Other antenna dimensions are available underrequest.

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

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

These long wavetransmitters use FSK modulation with frequency precision of +/- 107 Hz andsignal speed of 200 Bd.

In a precisionreceiver antenna design configured with a resonant tank is very important thequality factor of the circuit, which is a combination of the "Q" ofthe coil and "Q" of the capacitor.

The higher is thequality factor, the more sensitivity will have the signal reception of theantenna. (f.e.m will be increased in the tank), but on the contrary, thebandwidth of the resonant circuit becomes narrower. So, small variations in theinductance (L) or capacity (C) could cause a shift in the operating frequencyand therefore a significant loss of receiving signal; thus compromise isestablished of quality factor "Q" to assure the proper operation of theantenna: 60-90.

Receiver antennas for synchronized watches and ripple control applications_A