Hi Patrick, I did the same mod when I bought my SPR-4 back in 1979 - and the audio quality was just as awful. In fact the audio quality was the main reason I and the SPR-4 parted some 15 years later. Maybe a highpass audio filter might be helpful - I assume if you can clean up the lowest 2-300 Hz the audio quality should improve. Should have steep edges though.
-- From The World's Northernmost DX-er Bjarne Mjelde Berlevag, Arctic Norway www.kongsfjord.no weblog: mjelde.blogspot.com På Mon, 28 Nov 2005 10:28:11 -0800, skrev Patrick Martin <[EMAIL PROTECTED]>: > Greetings everyone, > > Recently I got the mod done on my Drake SPR4 so the 2.3 crystal filter > will work on AM. The filter is very good. In some cases comparing the > R/C filter, also 2.3 khz on the R8, the SPR4 does better. It is amazing > hearing the difference. But the problem I now have is the audio on the > SPR4 is so muddy that understanding is hard to do in many cases. In > comparing the 2.3 khz crystal filter in the old SP-600 I had, the audio > could be adjusted with the crystal phasing, which the SPR4 does not > have. The notch filter helps a bit. I do have an old Radio Shack graffic > eq that I could run the audio through. Any suggestions on cleaning up > the SPR4 audio? Thanks. > > 73, > > Patrick > > Patrick Martin > Seaside OR > KAVT Reception Manager > > ---[Start Commercial]--------------------- > > World Radio TV Handbook 2006 is coming out. > Order yours from > http://www.amazon.com/exec/obidos/ASIN/0823059367/hardcoredxcom/ > > ---[End Commercial]----------------------- > ________________________________________ > Hard-Core-DX mailing list > Hard-Core-DX@hard-core-dx.com > http://arizona.hard-core-dx.com/mailman/listinfo/hard-core-dx > http://www.hard-core-dx.com/ > _______________________________________________ > > THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed > and/or modified under the conditions set down in the Design Science > License > published by Michael Stutz at http://dsl.org/copyleft/dsl.txt ---[Start Commercial]--------------------- World Radio TV Handbook 2006 is coming out. Order yours from http://www.amazon.com/exec/obidos/ASIN/0823059367/hardcoredxcom/ ---[End Commercial]----------------------- ________________________________________ Hard-Core-DX mailing list Hard-Core-DX@hard-core-dx.com http://arizona.hard-core-dx.com/mailman/listinfo/hard-core-dx http://www.hard-core-dx.com/ _______________________________________________ THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed and/or modified under the conditions set down in the Design Science License published by Michael Stutz at http://dsl.org/copyleft/dsl.txt