To my way of thinking, "C1" "C1.2" "C3.2" are to confusing to keep track of without major effort. I created "MX-E" "RF2-B" and so on to replace them. The letters "-A" "-B" and so on are unique. The "RF1" "MX" and so on just identifies the module. Use the picture below to correlate the two systems with the hardware.
The small green designators correspond to the identifiers on the SX-28 manual snippit at top.
To measure or inject signals into V2 pin 4, connect to RF2-C.
To measure or inject signals into V3 pin 8, connect to MX-E.
To measure or inject signals into V1 pin 4, connect to RF1-A. Connection is through a 10 ohm resistor.
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Last modified: Friday, 15 May 2026