[Elecraft] K3 birdies - question?

[Joe Planisky]

I find a portable (i.e. battery powered) short wave receiver very  
useful for tracking down local sources of EMI.  When I hear EMI that  
goes away when I remove the antenna on my K3, I get out my SWL  
receiver and tune it to the same frequency so I can hear the EMI on  
it.   With the telescoping whip antenna partially extended, I walk  
around the house, placing the tip of the whip near suspected devices.   
It's usually very obvious when you find the emitter as the signal  
rapidly gets louder as you get close.  I then make a note in my  
logbook of the frequency and the offending device so I know exactly  
which gadget to turn off if the need arises (assuming I can't easily  
fix the device.)

It's a little less disruptive than switching off circuit breakers.

73
--
Joe KB8AP


On Mar 4, 2009, at 10:35 AM, KC2UEE wrote:

> Aha!  I think you're on to something here Bill.
>
> My RG-8 actually snakes its away around one of my entertainment  
> centers
> where I happen to have a cable modem, network switch, and seperate  
> wireless
> router all in the same spot.  I have a PS3, Xbox360, and an Onkyo TX- 
> NR905
> receiver all wired by CAT-5 into the switch, plus the wireless  
> router also
> wired into the switch is only a few inches away.  The RG-8 runs  
> behind all
> of that stuff, and if I recall, I simply have the cat5 cable laying  
> loosely
> around it.  There also happens to be several wall-wart transformers  
> behind
> the entertainment center, which I'm sure aren't helping the situation.
>
> When I get home, I'll try and turn off the network devices and see  
> what
> happens.
>
> Like you, I'm also a computer geek hihi.  I've got 2 home built  
> PC's, a
> Mac tower, and 3 laptops floating around the house all networked  
> wirelessly.
>
> It never crossed my mind to check the network for EMI... thanks  
> again for
> the suggestion!
>
> 73,
> James KC2UEE