Re: [Elecraft] Noise with KUSB

2009-08-05 Thread Mike Harris
5:54 AM Subject: Re: [Elecraft] Noise with KUSB Hi Mike. Thank you for answering! I have the KUSB adapter from Elecraft. Do you suggest that I make a short cable like you did between the K3 and the KUSB? The noise is specially irritating on 6 m. I don't have a preamp yet, but building one

Re: [Elecraft] Noise with KUSB

2009-08-05 Thread Gary Hinson
K3 KUSB PC communicating with K3: +10dBV K3 RS232 cable KUSB PC communicating with K3: +0dBV I wonder if physical proximity of the USB-serial adapter to the rear of the K3 is the cause of the problem? Maybe a magnetic coupling into the RX?? I'm guessing. 73 Gary ZL2iFB

[Elecraft] Noise with KUSB

2009-08-04 Thread Svend Spanget
I recently discovered the source of a very annoying noise in my K3. When unplugging the USB cable from my USB hub the noise in the receiver disappears. How do I get rid of this? I am using HRD, so a connection to my PC is really needed... 73's Svend, OZ7UV

Re: [Elecraft] Noise with KUSB

2009-08-04 Thread James Sarte
Svend, have you tried isolating the K3 and USB hub by using chokes on all of the K3's inputs and outputs and the USB hub's outputs plus power adaptor input? 73 de James K2QI On Tue, Aug 4, 2009 at 6:38 AM, Svend Spanget span...@privat.dk wrote: I recently discovered the source of a very

Re: [Elecraft] Noise with KUSB

2009-08-04 Thread Paul Christensen
I recently discovered the source of a very annoying noise in my K3. When unplugging the USB cable from my USB hub the noise in the receiver disappears. I had posted on this topic a couple weeks ago. I didn't discover my own noise problem until I was looking at the noise floor with a SDR-IQ

Re: [Elecraft] Noise with KUSB

2009-08-04 Thread Rick Tavan N6XI
You've found the noise source; now find a way to eliminate or replace it. Does your USB hub use a wall-wart power supply? Some of these are noisy. Maybe you have another USB port on your computer to which you can connect the KUSB directly, bypassing the hub? Also, some USB hubs work OK with the PS

Re: [Elecraft] Noise with KUSB

2009-08-04 Thread Joe Subich, W4TV
On Tue, Aug 4, 2009 at 6:38 AM, Svend Spanget span...@privat.dk wrote: I recently discovered the source of a very annoying noise in my K3. When unplugging the USB cable from my USB hub the noise in the receiver disappears. How do I get rid of this? I am using HRD, so a connection

Re: [Elecraft] Noise with KUSB

2009-08-04 Thread Svend Spanget
Thanks for the replies, all. I'm using a laptop PC with 3 USB ports. With mouse, keyboard, harddisks and other devices I am using 3 USB hubs Plugging the cable from the K3 directly into a USB port on the PC does not remove the noise. The hub doesn't have a PSU, but there are a lot of small