[Elecraft] K3. 28MHz listen on 144MHz

[F4AAG]

to highlight the lack insulation between the connectors HF and VHF, I 
injected into the HF input a level of-70dBm. The carrier was then heard 
on 2 meters with a level S2. I am surprised that the insulation is not 
better on the K3. DH8BQA proposed disconnect the HF input when using the 
VHF band, which must be very efficient but not very practical. Has 
anybody there another solution.