[Elecraft] K3 Utility fails to recognize K3

[Guido Tedeschi]

2Cents wrote:
> I can't get the K3 Utility to talk to the K3. When I test communications I
> get no dialog boxes at all, and it doesn't populate the "Installed in Radio"
> column.
Chuck,
    test the RS232 TXD output: in idle state should be at least at -5V.
If it is about 0V and goes negative when you increase the power supply 
to 14V, there would be a problem in the circuit that generates the 
negative voltage for RS232.
A friend of mine had this problem and, after receiving and installing a 
new KIO3 sent very quickly from Elecraft, I checked the faulty KIO3 and 
found that the value of R1 (1K) was too low: changing that resistor with 
2K2 made the oscillator working fine even with 10V of power supply.
73 de Guido, ik2bcp