Do you have the subRX AUX antenna selected for 20 meters?
Enter BSET and tap ANT to switch between the main antenna and the AUX 
antenna.

73,
Don W3FPR

On 3/4/2012 9:27 AM, István Szabó wrote:
> Just observed that the subreceiver of my K3 does not work on 14 MHz
> only. When I tune the sub it looks like that the VFO changes its
> frekvency as I hear "spurr" while tuning. No signal heard coming from
> antenna input. This phenomena is on 20m only the rest of the bands are
> fine. No difference between modes. Where shall I start the diagnosis?
>
> 73'
> István Szabó
> HA4ZD
>
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