Swing Kit Vs. NPC (ept3600)

It depends on the pc board in question, on a DX66V (ept360014) a swing kit is 1N4001 diode added in series with R238, sometimes hackshops just remove the resistor and install a diode in place of R238, then they cut the AMC resistor.
This allows the radio to swing to near max p.e.p. from any dead key, it looks rough on the scope.


NPC...

Swing Kit Vs. NPC (ept3600)