That was done by
measuring the "strength" of the tone when analysing the wav files with Spectrum
Lab. The receiver AGC made the peak noise level the same I could read off
the difference in tone level (in a tiny bandwidth) .
The S meter on the
receiver has gone from about S3 to S7 which would indicate a much worse
degredation but who believes S meters?
I would very much doubt
that there's any effect on LW BC band, that extra 20kHz will make a big
Note to David:
put the aerial back up and made the comparison recording and it
that the background is about 13dB higher here with Rubgy on. The
signal is now a good deal more difficult to copy! I will send
recording is you need them.
73 and clackety-clack from Dave
Only 13dB is quite a surprise. That's about 2 S points up from the
background. Are you measuring in a reasonable bandwidth. 500Hz or above.
Apparently the output at 136kHz is only 48dB down on level at
Is there any sign of interference to 153 or any LF broadcaster?