[Elecraft] WSJT-X K3/K3s hanging as Tx

[Don Wilhelm]

Richard and all,

The proper place to cure "RF in the shack" problems is in your antenna 
system.  A good common mode choke (many call it a balun) in the antenna 
feedline and running the feedline at right angles to the radiator 
(assuming a dipole) to keep the feedline from picking up radiation from 
the radiator.  If that physical configuration cannot be avoided, then an 
additional common mode choke at the shack entry point can help.

In the case of off-center fed antennas and end-fed antennas, often the 
common mode current on the feedline can be difficult to cure.  Use of 
one or more of the effective "baluns" described by Jim Brown K9YC at 
http://audiosystemsgroup.com/RFI-Ham.pdf will help.

With effective common mode chokes on the antenna and feedline, you 
should not have to use ferrites on every cable in the shack - a much 
more sane answer IMHO.

73,
Don W3FPR

On 11/13/2017 5:46 PM, Richard Lamont wrote:
> On 13/11/17 19:12, Gary Smith wrote:
> 
>> For those using WSJT-X, sometimes I find
>> the K3s is locked as transmit but there is
>> no RF being sent and no Rx from the K3.
>>
>> Anyone experience this and figure out how
>> to prevent it?
> 
> I've seen this occasionally too. I've had a number of odd malfunctions
> of USB-connected devices in the presence of RF. I now have fitted
> ferrite rings, with as many turns of the cable as would fit, at the
> computer end of the all the USB cables going into the PC.