[Elecraft] KX3/PX3/KXPA100 USB control harness noise

[David Anderson]

Jack,

Are you using the Elecraft USB adaptor lead? I ask because initially I was intending to use a built in USB to serial COM port in my Digimaster Pro interface box for CAT with my KX3, but got terrible noise from its polling. 

Moving to using the Elecraft USB adaptor instead cured that. As a reference point I only have the Laptop USB connected to a PX3 and from there to the KX3 and am using only 144 MHz with an external transverter from 14 MHz.  I didn't need any ferrite on that port. I did need some on other USB leads and HDMI leads however. 


73

David Anderson GM4JJJ 

> On 31 Oct 2015, at 18:44, Jack Spitznagel <sancho at frawg.org> wrote:
> 
> I am seeing see about a 1 S-unit jump in this noise above the floor in quiet band conditions when I use rig control (any program) on a Dell laptop. Rig power supply is quiet.
> 
> Before I spend a lot of time reinventing things... and trying to figure out how to search the archives for something this specific:
> 
> Is there someone who has used ferrites to kill hash noise that only occurs with this combination of rig, panadapter, and amp setup when the Elecraft Utilities or a rig control program is running?
> 
> If so what type of ferrite(s) did you use and where did you place them?
> 
> Observation: I can knock the noise down by half by putting a "medium sized" clip over ferrite (sorry, it says TEAC on it... no model number) right at the box on the KXPA100 to KX3 adapter cable.
> 
> That may be the best I can do - if so thanks for reading this and not telling me to search the archive...
> 
> Jack - KD4IZ
> 
> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to gm4jjj at yahoo.co.uk