[Elecraft] K3S oscillation issue

[Fred Jensen]

As Guy says, "... it almost never involves something wrong with any 
transceiver." At former QTH, my 70' tower/tribander was out back on 5 
acres, about 200 ft from the shack.  I was running RTTY then with my 
K2/100, and to aid in cooling, I mounted a computer muffin fan on top of 
the heat sink.  It made a huge difference.  On 15, only, with the beam 
pointed over the shack, every time the TX came on the fan stopped. The 
suspended coax from the tower to the shack was along that same azimuth, 
the antenna wascreating common mode currentswhen pointed in that 
directionand for some reason, the brushless fan motor was sensitive.  A 
common mode choke at the shack entrance fixed the problem.

73,

Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn

On 5/31/2017 10:05 AM, Guy Olinger K2AV wrote:
> Talking to the masses as well as the original poster.
>
> Many of us, this writer included, have experienced RFI, and it almost
> never involves something wrong with the K3, or any transceiver, for
> that matter. It was lack of bonding and/or grounding, loose leads,
> plugs only halfway in, PL259's or BNC's not fastened down all the way,
> broken or unsoldered or untightened shield connections, some
> unfortunate wide-open physical path into the shack, an RF open barn
> door, and more, a long list, sometimes humorous, but all physical,
> physical, physical.
>