Hello Reiner,
Did you use all the values of the low band LP filter 20/30 for HB-QDX?? Were you able to look at the harmonics from this modification?? I did not make any changes to my HB lpf and the second harmonic did not meet FCC requirements on 30m.? I have been toying with changing out the filter, but wasn't sure it was worth the effort.
.Andy W3SW
