I was experiencing broadband noise on the spectrum generated from my RX I/Q port when the KX 3 ACC port was connected via USB to my laptop. I tried grounding, different USB adapters and cables, and ferrite toroids without any success. All the gear is powered by battery.
I suspected a ground loop as the noise was uniformly distributed around the tuned frequency. I ordered an Adafruit part number 2107 USB Isolator for $35 from Adafruit.com. This board isolates both the power and data on the USB connection to eliminate ground loop problems which can plague USB test equipment as well as ham gear. Plugging it between the laptop and the ACC port USB cable removed the noise completely.
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.htmlMessage delivered to
[hidden email]
Locked
