[Elecraft] Glitches in K3 Filter response

[Jack Smith]

I went back and looked at the response data I took in August using my 
version of the self-test bandwidth program and see the same artifacts.

I work very little SSB and did not pay as much attention to the SSB 
filter plot as I should have - with the narrower filters for data and 
CW,  the artifact seems either invisible or greatly attenuated.

It's not related to input filter switching. Sorry about any confusion.

Jack K8ZOA


AD6XY wrote:
>
> Jack Smith-6 wrote:
>   
>> As I understand it, the K3 switches to a different input bandpass filter 
>> at 10.000 MHz which I believe is the source of the artifact. You will 
>> get a cleaner response with K3 Filter if the test signal is not at 10 MHz.
>>
>>     
>
> 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.
>
> 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 noticed that the K3 audio into the loudspeaker does distort very
> badly indeed but stopping the important controls working was a surprise.
> Power off should do just that, always, no delay no debate. 
>
> Mike
>