14sep16: RF couplers



    The rf couplers sample the transmitter output and reflected power. There are a set of couplers for each transmitter band.

    Each coupler set has:

    Since  the 5.15 and 8.175 MHz couplers have different frequencies ranges, they need to be calibrated separately.
We looked at multiple 5 MHz couplers and their values were similar.

    We use the forward power couplers to log the transmitted power (using the rf port switch and the anritsu spectrum analzyer). For accurate recording, we need to the the coupling coefficient and well as the loss in the cable from the coupler to the anritsu.
     These measurements give the coupling coefficient. The cable loss was measured separately.

Measuring the coupling coef..

   The setup:

Plots of the coupling coefficients:

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