[Elecraft] K3 on 50 MHz - noise and possible harmonics

[Steve Lund]

I have all these spurious signals in my K3, too.

They are caused by my wireless router. But are the result of using wired
connections to my office computers. When I remove the LAN cables these
signals disappear, along with many on the hf bands.

I have received the ferrites recommended by K9YC. The plan is to install
them on Wednesday. I have both the #43 and #61 material.

Steve, K6UM

On Mon, Jun 29, 2015 at 7:43 PM, Chris Hallinan <challinan at gmail.com> wrote:

> I've been playing around with 50 MHz USB/CW down at the low end of the band
> with a plain ol' dipole.  I'm curious about noise and birdies and other
> people's experience, as I really don't know what to expect.
>
> I have a steady S3/4 noise level at all frequencies with the preamp off,
> jumping to solid S5 with the preamp engaged.  I have several strong signals
> (probably harmonics of some interference??)  as follows listening in USB
> mode, preamp off:
>
> 50.026: S4
> 50.057: S6
> 50.087: S5
> 50.117: S6
> 50.148: S6
> 50:178: S4
> and more as I tune up. Notice the 30KHz spacing.
>
> These are all steady 2-tone signals with perhaps a couple hundred hertz
> difference in the two tones.  No variation with day/night or propagation as
> far as I can tell.  They all disappear when the antenna is disconnected.
>
> First, is my background noise level local or should that be expected on 50
> MHz?  And what are these signals spaced every 30 KHz or so?
>
> Could this be broadcast overload way up here on 50 MHz?  I do have a fairly
> close 1580 KHz AM station broadcasting 1100 watts during daytime, and 110
> at night, but I use an Array Solutions BCB filter.
>
> What have others experienced?
>
> Thanks and 73,
>
> Chris
> K1AY
>
>
>
>
> --
> Life is like Linux - it never stands still.
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