| 145.00 | -18 | -14 |
| 435.00 | -22 | -8 |
-The directivity doesn't match the datasheet, even at low frequencies, but I
-might blame the 50R termination as any reflected power will be seen in this measurement, see below:
-
-[[!img notes/Characterising_a_coupler/IMG_20180930_203828.jpg size=300x300]]
-
The directivity doesn't match the datasheet, even at low frequencies, but I
might blame the 50R termination...
Repeating the measurement with the better 50R terminator shows much improved
directivity (shock horror!).
-| | Directivity [dB] |
-| |------------------|------------------|
-| Frequency [MHz] | Poor termination [db] | Good termination[db] |
+| | Directivity [dB] ||
+|
+| Frequency [MHz] | Poor termination [dB] | Good termination [dB] |
|-----------------|------------------|------------------|
| 1.80 | -44 | -54 |
| 5.36 | -40 | -52 |