That sounds like a better solution. UnfortunTely the eBay 8 port USB to serial does not have a case. Thanks
-------- Original message -------- From: Matt Zilmer <[email protected]> Date: 06/11/2013 09:29 (GMT-05:00) To: Tom Blahovici <[email protected]> Cc: [email protected],[email protected] Subject: Re: [Elecraft] Serial Connection for K2 Hi Tom, I run a Win7Pro laptop with a ton of USB devices here in the shack. There is a single 16-port USB hub to the laptop. One of the peripherals is a 4-port Edgeport. I found that the only ferrite needed is at the laptop end of the A to B cable for that hub. Everything else is dead quiet. The hub is quite sturdy, with a metal chassis that I've connected to the shack ground. The above replaced a number of hub "chains" and several USB to serial adapters (plus the other peripherals chained onto inline hubs). For EMI issues, this was unmanageable and I replaced all this crazy USB cabling with a single hub because I had quite a time diagnosing the various RF noise sources (probably all were hub-based). The ferrite also protects the laptop against RFI. On certain MARS bands, 11 MHz in particular, high output transmissions could cause the laptop to reboot. Not so any more. Ferrite recommended is Laird Technologies, available from Digikey. 240-2508-ND is the DK part number. The largest core (19mm I.D.) can accept 3-5 turns of a USB cable with a Type A connector on the host end. Hope this helps your situation. 73, matt W6NIA On Wed, 06 Nov 2013 01:27:59 -0500, you wrote: >Hi, >I see ebay has some 8 port Edgeports for $50. >Im looking to cut down on computer generate noise in my shack. Currently I >have 6 or 7 usb to serial adapters. I reduced noise quite a bit as shown on >the P3 using some ferrite cores but the whole mess is now quite a sore sight. >Not only that you need longer cables to wrap through those cores. >So heres a few questions: is it better to run one high quality USB cable to a > device such as an edge port and then run serial cables from there or have >many usb to serial converters and extensions? >Anyone have a source for properly shielded USB cables? >Thanks > >On Nov 5, 2013, at 8:54 PM, Don Wilhelm <[email protected]> wrote: > >> Tom, >> >> Use a USB to serial adapter with an FTDI chipset - the Prolific c ______________________________________________________________ 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
