[Elecraft] K3 RF Feedback Problem

[Paul Christensen]

> I just added a jumper around (well, actually over) my L4. No need to risk
> possible PCB damage by completely removing the RFCs.

Unless the RFC begins to move under heat and begins bridging to an adjacent 
pad or trace.  Even when being careful, SMT/SMD parts can slightly shift on 
the PCB.

Just my $0.02, but I prefer the removal of the RFC and short the pads with 
0-ohm resistors, or fine magnet/buss wire.  Removal of surface-mounted 
components is generally easier than that of through-hole components.  Also 
important is that owing to packaging density, some of the pads and traces in 
the K3 are extremely delicate and it does not take much lateral pressure on 
some SMT/SMD components to accidentally remove a pad or trace.  No matter 
what style of component work-around you use, treat the pads and traces with 
utmost respect..

Also, as Lyle pointed out, L4 and L7 in question are on separate PCBs (Main 
DSP Board and KIO3).  Anyone contemplating the mod should first familiarize 
themselves with the schematics or they may be removing the wrong component 
since identical component designators are used in the K3 across multiple 
PCBs.

Paul, W9AC