[Elecraft] lsb usb different in spetrogram- why ?

[Wolf-Ruediger Juergens]

Hello Don,

> You might want to re-check the setting of L34 - it will have an effect on
> the flatness of the passband.  Also check the component values of the 2nd
> filter flattening mod - (either the original 120 pf capacitor or the 
> later
> 100 pf capacitor AND 5600 ohm resistor across the product detector 
> output).

I exchanged the 120pF with the 100pF and did a new alignment of L34. Now 
its better and the difference is less than 5dB. Thanks for the hint, I had 
forgotten that the 100pF affect the spectrogram also.


> Were you using the headphone output or the external speaker output to 
> drive
> the soundcard.

I use the phone output from the K2DSP. A 470nF from pin 6 of J2 direct to 
the microphone jacket. I found a hint of using this output for digital 
modes in a posting from Lyle here.


72 Wolf, DL2WRJ