[Elecraft] Glitches in K3 Filter response

[Mike Downs]

Mike AD6XY wrote:

> I don't know about this but I find my K3 switches the filter and band at
> 9MHz. I tried using 9MHz just now to verify this. The mode changed as I
> moved from 9MHz to just above. I don't understand why but the mode changed
> from USB just below 9MHz to TX data just above it. Odd. This does not 
> happen
> when you spin the dial so perhaps a bug in Mikes program.

9 MHz is the transition between two bands (40 M & 30 M) on the K3. When you 
used K3 Filter Tools to cross the 9 MHz boundary the mode will automatically 
be switched from the last mode used on 40 M to the last one used on 30 M. 
Thus, your mode automatically changed from SSB to Data. Users should be 
aware of these transition boundaries between the bands when they are using 
K3 Filter Tools.

> I also found another bug. The AGC was turned off and I was supposed to set
> the centre frequency. The audio was so loud that it was distorted badly 
> and
> the volume would not decrease with the pot, even the radio power off 
> switch
> failed to work. I had to cut the signal to regain control.

I have not been able to reproduce this problem, but it is not a bug in the 
program. K3 Filter Tools does not control the AF gain control at all, but it 
does turn off AGC. I am modifying the program to turn down the AF gain just 
before it turns off AGC. That will prevent the loud, annoying burst of sound 
users are experiencing.

Thanks for your comments.

Mike, KS7D