(no commit message)

[wikirepo] / notes / Characterising_a_coupler / index.mdwn

diff --git a/notes/Characterising_a_coupler/index.mdwn b/notes/Characterising_a_coupler/index.mdwn
index b208105..190f174 100644 (file)
--- a/notes/Characterising_a_coupler/index.mdwn
+++ b/notes/Characterising_a_coupler/index.mdwn
@@ -3,7 +3,7 @@ cheap at a rally.  I'm interested to see how it matches up to the spec.
 
 The datasheet claims 0.3dB insertion loss, -19.3dB coupling (forward), and 50dB
 directivity at 1MHz.  Right now, I'm interested in results at 5MHz, but that's
-the nearest point fro m the spec.
+the nearest point from the spec.
 
 I've no hope of measuring insertion loss to 0.3dB, so lets look at directivity
 and coupling instead.  Tools available are an FT817, and my W7ZOI [powermeter]().
@@ -13,6 +13,7 @@ using the tune tone from wsjt-x and adjusting the audio drive to control
 power.
 
 To measure coupling:
+
  1. Terminate the *cpl* port in 50R
  2. Connect the rig to the *in* port
  3. Connect the power meter to the *out* port
@@ -22,6 +23,7 @@ To measure coupling:
        the power meter to *cpl* and record the reading, that's coupling.
 
 To measure directivity:
+
  1. Terminate the *out* port in 50R
  2. Connect the rig to the *in* port
  3. Connect the power meter to the *cpl* port
@@ -29,16 +31,16 @@ To measure directivity:
        0dBm forward power on the meter
  5. Reverse the *in* and *out* ports and measure power, that's directivity.
 
-+----------------------------------------------------+
+
 | Frequency [MHz] | Coupling [dB] | Directivity [db] |
-+----------------------------------------------------+
+|-----------------|---------------|------------------| 
 | 1.80            | -18           | -44              |
 | 5.36            | -18           | -40              |
 | 10.11           | -17           | -38              |
 | 50.00           | -17           | -25              |
 | 145.00          | -18           | -14              |
 | 435.00          | -22           | -8               |
-+----------------------------------------------------+
+
 
 [ZDC-20-3]: /notes/Characterising_a_coupler/ZDC-20-3.pdf
 [powermeter]: /notes/W7ZOI_Power_Meter