CHEMANDY ELECTRONICS

FLEXI-BOX Termination Box

   The Termination Box is built in a FLEXI-BOX on a dedicated PCB. The  connectors can be selected from BNC, N and SMA. The box contains Short, Open and Load. It is intended as a lab aid and is also part of the Chemandy Standing Wave Demonstration Kit. The Load is selected at 50Ω and the Short and Open terminations are approximately equal in electrical length (within + 1.0 mm).

We can build and test these at Chemandy with a Load return loss of better than 30 dB up to 300 MHz for Zo=50Ω. The 50Ω Load is rated at +24 dBm maximum input power.

RESISTORS

A resistor has series inductance and this affects high frequency performance. The method used to overcome this problem in the  termination, is to put resistors in parallel. The graph above shows the progressive addition of resistors and the effect on return loss.

  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.

Pricing

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