[Elecraft] K3 Filter Plots

[Mike Downs]

Jerry wrote:

> After I used it, my K3 had been changed. Before, it was a 100 W unit.
> After, only 12. I had to restore an earlier K3 configuration file to
> restore it. There might have been other K3 changes also that I
> corrected by this config restore without even knowing they had
> occurred, so other users should watch for them.

When you begin the dBV Linearity or Filter Sweep procedure, the program 
records the K3's settings for AGC, Preamp, Attenuator, RF Gain, Mode, Power, 
VFO Frequency, Filter Number, and Filter Bandwidth. During the procedure the 
program turns off AGC, Preamp and Attenuator if they are on, and sets the 
Power to 0.0 watts (just in case). At the completion of the procedure the 
user can click the Reset K3 button to return their K3 to the state it was in 
before the procedure began, or when they close the form their K3 will be 
reset automatically. Of course, if the program is prematurely terminated by 
the user it will not have been able to reset the K3.

> Also, I had to reboot the computer to get the serial port back -
> K3FilterTools apparently did not release it when it exited.

This was a problem with the original program posted on the web site. If the 
program was terminated by using the File Exit command it would release the 
serial port, but not if it was ended by using the Control Box (my bad). This 
issue was fixed and the revised program uploaded to my web site on Thursday 
evening (1/15/09).

> Thankfully,  my K3 did not transmit into the signal generator -
> probably would have ruined the little Elecraft XG-2 and w8diz 10 MHz
> oscillator I was using.

Accidental transmits are the reason the program sets Power output to 0.0 
watts when the procedures are running. However, if the user has set Config 
Autoinfo to Auto 1, the K3 can be keyed when the user first connects to 
their K3. This problem has been fixed, but the revised program has not been 
uploaded to my web site yet. I plan to upload it this evening along with 
some other revisions I am working on.

Thank you for reporting the problems you had using the program. That way I 
can fix them.

Mike, KS7D