On Sun,9/11/2016 1:46 PM, tomb18 wrote:
My edgeport mutiserial port usb device will lock up as well as any software when I transmit at over 100w on 160 and 80m. The only thing that will restore things is to do a power down. Its possible that you may have an rfi issue. Check any usb hubs too.
Study k9yc.com/RFI-Ham.pdf for reliable cures for RFI problems, including this one. I have three specific recommendations for you. 1) wind at least 12 turns of the USB cable through a Fair-Rite #31 2.4-in o.d. ferrite core. Do the same with each serial cable. 2) If that does not fix the problem, replace each serial cable with one you have built yourself with CAT5 cable and DB9 connectors. See detailed instructions for the cable in http://k9yc.com/GroundingAndAudio.pdf -- Slide #184. 3) Bond from chassis to chassis of all the gear in your shack with short, fat copper. Study that same set of slides.
I experienced exactly this problem when I lived in Chicago, where my primary antenna for 80 and 160 was a Tee-vertical that I loaded as a long wire, using a big wrought-iron fence as a counterpoise. This put a big current peak in the shack, which coupled magnetically into the serial cable. As little as 14W caused the serial port to lock up. When I replaced the serial cable between the computer and my K2/100 with a cable that I built from CAT5, I was able to run my Ten Tec Titan amp at legal limit without interference.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
