The RF Trap With Attenuators is built in an Original size FLEXI-BOX on a dedicated PCB. These units can be supplied ready built and tested from Chemandy with a trap frequency of 400 KHz to 1.0 GHz. The nominal attenuation is 16.5 dB ± 0.5 dB over the 300 KHz to 3.0 GHz range, with a notch of a further 30 dB ± 3 dB at the required trap frequency and a gentle downward slope at the higher frequencies which is dependant on the capacitor value used. The input and output connectors can be selected from BNC, N and SMA. The maximum continuous input power level is +22 dBm. The following figures show the response with a trap frequency of 450 MHz.
A detailed circuit description of the RF Trap With Attenuators is available together with a calculator for resistor values. If you wish to build this unit, the filter frequency can be selected as required using the resonance calculator.
This test aid is available Ready Built or in Kit form. The Kit contains the hardware only; i.e. box, pcb, connectors, screws etc. Components are not included because they are surface mount and it is impossible to supply the correct amount because of the 'ping' factor. Anybody who has fitted surface mount components will know that when a component is being placed with a pair of tweezers there is often a 'ping' and the component disappears into thin air. We would have to supply at least two of every component thus doubling the cost.
A selection of escutcheon drawings are available for downloading as .zip or .bmp files.
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