Based on the description of your rig, you have the original synthesizer(s).
The noise mod involved adding some resistors and diodes to the K3 main board at
specific spots and making some firmware adjustments.
On the assumption that you have the resistors and diodes already, per your
description of your K3 vintage, here are the firmware comments from the mod
instructions:
**************************
IMPORTANT: You must install the resistors and diodes as described above before
changing the bus
clock rate. Failure to do so will result in erratic behavior of your K3.
1. Download and install firmware revision 3.24 or later. Refer to the K3
software page for instructions.
2. IMPORTANT: Locate the CONFIG:VCO MD menu entry, and tap the 1 keypad switch
until you
see SPI 2; this selects the new bus clock rate. (The default setting is SPI 1.)
*************************
I will email you the mod instructions separately so that you can see where the
resistors and diodes should be (although Elecraft may have relocated them in
later production). Then you can proceed with the CONFIG setting.
73, Paul W8TM
[Elecraft] K3 Problem, VFO Noise While Rotating On 10 Meters
Randy w9zr at aol.com
Wed May 19 06:46:18 EDT 2021
When I tune the VFO knob on 10 meters I hear a scratching type noise. This
problem only occurs on 10.
There was an Elecraft mod that addressed this issue for early serial number
K3's but my K3 is a later unit with the mod built in at the factory during
production. Can anyone shed some light on this issue? I assume that this is
not normal operation. 73 Randy
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