Jim, Yes good points , note the narrow front end ..looks good on a plot ..no use for s/n LC in front of the mixer = more noise , same argument over tuned/un-tuned rx antennas ... look at these min-wh
Hello all, I have been thinking about the recent debate wether a separate USA and European channel is a necessity. Looking at the quoted figures for signal levels the required dynamic range is a mode
John, Roelof, I feel that WSPR can be used 2 ways (on 137kHz / 500kHz): 1. using low power TX (let's say ERP< 100mW) for continental and occasional intercontinental reception 2. using high power TX (
Dear John, Roelof, LF Group, I think this problem and the discussion just reflects the fact that receivers are not really designed for use with digital modes, particularly ones that are very narrow-b
Hello John, What I tried to explain is that all the stages in the receiver needs to be linear with the AGC switched off, including the LF stage to cope with weak and strong signals present in the ban
Roelof, LF, Erudite points well put, as ever. One point keeps nagging at me. If Jay is correct, and the number of strong (high power/efficient antenna/high ERP/groundwave path) W stations is large en
Roelof, LF, Erudite points well put, as ever. One point keeps nagging at me. If Jay is correct, and the number of strong (high power/efficient antenna/high ERP/groundwave path) W stations is large e
