Thanks for the help! > New information!
Thanks for the help guys! Problem solved! Special thanks for Aberto and Leif. Linrad was the most useful tool in searching the problem and Winrad will be my no 1. choise for RX, like it a lot! There was three issues. 1st, the soundcard I use (E-MU) indeed has a quite huge delay on the other channel which made the finding other faults a bit difficult. 2nd, my QSD was a bit unlinear. The cause for this was bad sampling capacitors (bad match) and I also did small modifications for the components surrounding the LT1115 opamps (feedback capacitors etc). And the 3rd one, I needed more RF isolation between the QSD bias and the minicircuits wideband transformer. This removed the amplitude problems which was quite a surprise! I can now achieve (still with E-MU) over 50db to 55db image rejection on 48kHz spectrum. Happy happy :D 73 de Janne Pulkkinen, OH1GTF
