[Elecraft] RFI, KUSB - outcome

[Ignacy]

I checked KUSB (bought 1.5 years ago) and the shield was not connected to the
RS232 plug. After grounding, the white noise decreases dramatically but some
noise still remains. Below the band noise on 160m noise with a  vertical and
above the noise with K9AY.

The other USB adapters that I tried have the grounding and have very low or
no noise. Unfortunately they do not come back from hibernation like KUSB
does.

Elecraft support pointed to a grounding  modification of KIO3. My K3 was
supposed to have all the mods done when in Aptos earlier this year. I will
find out later whether KIO3 was modified. 

Ignacy

     



 > Can KUSB be damaged to produce RFI yet be functional as an adapter?

*ANY* USB adapter will generate a lot of RFI and continue to work
properly if the shield of the USB cable is open or the shell of
the motherboard USB connector is not properly bonded to the circuit
board groundplane.

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