When switching my K3 from RX to TX 100W FM, I measured these voltage drops:

0.03V directly at the Astron RS-35M's output
0.25V at an unused output of a WMR RIGrunner, connected to the RS-35M by a
2ft cable
1.00V as indicated by the K3, connected to the RIGrunner by a 4ft cable

By cable I mean the type supplied with the K3.

Certainly not as good as the 400mV reported by Guy K2AV.
Still better than the 1.7V reported by Harris K9RJ.
Corresponds to the 700mV reported by Joe W4TV (direct connection, no
RIGrunner)

Guess the major problem resulting from voltage drop is a reduced efficiency
of the KPA3.

73, Markus HB9BRJ
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