Dear Jim, Alan, Gerhard, LF, Agn tnx for your suggestions! OK, so my way to realise the filter was not too worse. Tomorrow i will play with a double LC filter, just as applied before the BF981, just
Alan Yes . your right , any 'Q' up front is a bad thing , ringing etc just go for the most expensive a/d you can afford and leave the rest to the dsp ... Simon Browns new sdr leave the filters in my
Dear Stefan, LF Group, The AADE utility will do the design calculations for you... the limitation of filters like this is that, in order to achieve a particular shape of frequency response, bandwidth
Hi Stefan I was surprised to see that message come though I thought I had had second thoughts and deleted it........ nevertheless the sentiment is still valid. If the signal from DLF overloads the in
Hi Stephan....why do you think you need a narrow filter at 12kHz?? Why not let the sound card sort it out? Provided you have killed the image (113kHz) there should not be a problem. If you use a narr
Hi Stefan! I wasn't following the discussion too closely yet but I had the best experience with pre-amplifiers when the very first stage is "passive" and not an active device as in your schematic. So
Thanks for all answers so far. Alan, i think that filtering is essential for me since DLF (153 kHz, 500kW) is just 40km distanced. I am afraid that the amplifier gets overdriven else. For DCF39, whic
