Differences

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--- attenuator [2024/02/06 15:41] – ei3jdb
+++ attenuator [2024/02/06 15:50] – ei3jdb
@@ Line 43: / Line 43: @@
  * Connectors and wire (I bought a pigtail that had a BNC at one end and an SMA at the other, and an N-type chassis mount with an SMA on the back)
- * Box that can sink the heat (I bent some 50mm x 3mm aluminium strip into half a box -- another piece of aluminium sheet can make a lid.)
+ * Metal box that can sink the heat (I bent some 50mm x 3mm aluminium strip into half a box -- another piece of aluminium sheet can make a lid.)
+You will also need things like a soldering iron, drills, spanners and screwdrivers to fit the connectors, and some way of measuring RF impedance.  I used a NanoVNA but any RF source coupled with a SWR meter should also work.
 ==Construction==
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+==Testing==
+Test that both the inputs produce the expected SWR measurements and impedance values (my NanoVNA said 49.something ohms and a few pF of capacitance in the 70cm band.) Also test that shorting out one port does not change the impedance values of the other by very much.
+If these tests pass, you have an attenuator.