updated tap notes
[wikirepo] / notes / a_40-ish_dB_tap / index.mdwn
index 45b2272..6ba067f 100644 (file)
@@ -1,3 +1,86 @@
+I build the 40dB tap from the same QST article as my power meter:
+
 [[!img IMG_20190702_201621.jpg size=600x300]]
 
+To make it useful, I need to measure the coupling and insertion loss, so here
+goes.  S1 and S2 are the through ports, S3 is the tap.  It's pretty flat over
+7-433MHz, with a through loss of <1dB and a coupling of 34-35dB.
+
+<table border="1" class="dataframe">
+  <thead>
+    <tr style="text-align: right;">
+      <th></th>
+      <th>F [MHz]</th>
+      <th>S1S2 [dBm]</th>
+      <th>S1S3 [dBm]</th>
+      <th>S2S3 [dBm]</th>
+      <th>SRC [dBm]</th>
+      <th>loss S1S2 [dBm]</th>
+      <th>loss S2S3 [dBm]</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <th>0</th>
+      <td>7.15</td>
+      <td>4</td>
+      <td>-30</td>
+      <td>-30</td>
+      <td>4</td>
+      <td>0</td>
+      <td>34</td>
+    </tr>
+    <tr>
+      <th>1</th>
+      <td>10.00</td>
+      <td>4</td>
+      <td>-30</td>
+      <td>-29</td>
+      <td>4</td>
+      <td>0</td>
+      <td>33</td>
+    </tr>
+    <tr>
+      <th>2</th>
+      <td>29.00</td>
+      <td>5</td>
+      <td>-29</td>
+      <td>-28</td>
+      <td>5</td>
+      <td>0</td>
+      <td>33</td>
+    </tr>
+    <tr>
+      <th>3</th>
+      <td>50.50</td>
+      <td>5</td>
+      <td>-28</td>
+      <td>-28</td>
+      <td>5</td>
+      <td>0</td>
+      <td>33</td>
+    </tr>
+    <tr>
+      <th>4</th>
+      <td>145.50</td>
+      <td>4</td>
+      <td>-29</td>
+      <td>-29</td>
+      <td>5</td>
+      <td>1</td>
+      <td>34</td>
+    </tr>
+    <tr>
+      <th>5</th>
+      <td>433.00</td>
+      <td>3</td>
+      <td>-30</td>
+      <td>-31</td>
+      <td>3</td>
+      <td>0</td>
+      <td>34</td>
+    </tr>
+  </tbody>
+</table>
+
 [[!tag draft]]