[Elecraft] K3: Are the birdies really birdies

[James Sarte (K2QI)]

Hi Mike,

They're not birdies, but real signals.  See what happens when you disconnect
your antenna.  If they were birdies, therefore originating from within the
radio, you'll still hear them.

I have two routers in my house, and both wreak havoc for me!  I still
haven't found a good way to minimize their impact.

73,
James K2QI

On Tue, Nov 16, 2010 at 6:02 PM, Mike K2MK <k2mk at comcast.net> wrote:

>
> There's a very interesting item in December's QST "The Doctor is In"
> feature
> (page 48 right column). Receiver birdies turned out to be caused by a noisy
> router. I have learned to live with 10 meter birdies on my K3. But lately
> I've been active on 12 meters and there is an S5 birdie at about 24900KHz.
> So after reading the article I started unplugging cables on my wireless
> router (which is in another room from my K3). Whoa, what's this? Birdies
> come and go as I unplug the router power line or unplug the CAT 5 cable
> going to the shack. Ditto in the shack. If I unplug the CAT 5 from the wall
> or from the PC the birdie on 12 meters disappeared. Moving on to 10 meters
> I
> discovered that all of the prominent birdies also disappeared. I haven't
> done a thorough investigation but I suspect they might all be gone.
>
> Of course that was only step one. I still need an internet connection on my
> shack PC so I'm currently experimenting. Snap-on ferrite cores had no
> effect. Moving the shack CAT 5 cable away from other radio related cables
> is
> having a positive effect. Next I'm going to try a shielded CAT 5 cable from
> the wall to the shack PC. But of course the cable wiring in the wall to the
> router is not shielded so I don't have high hopes of solving it in this
> way.
> But at least I'm on the right track and I'm sure I'll find something that
> works eventually.
>
> 73,
> Mike K2MK
> --
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-- 
73 de James K2QI
President UNARC/4U1UN