I was working POTA stations in the upper reaches of 40 meters, and you wouldn’t believe how rough the copy was … or actually, maybe you would. Summertime is here … terrible deadly thunderstorms in the Midwest … the general elevated noise levels in our normal environment … all combine to raise the noise floor on the lower bands to the point where many signals are on the cusp of being unreadable. Quite a few of the stations are using low power and compromise antennas. That, coupled with the heterodynes from AM broadcast stations, drive you to distraction. The QSB tantalizes you by raising the signals above the noise and then just when you’re ready to copy something critical, dashing them down into the mud. Life is hard 😀 !
But … help is available! Today’s SDRs really have the capability of pulling some of them out of the hash (I have an IC-7300). Yesterday, I resorted to using all of the bells and whistles I could … auto notch, noise reduction, twin passband tuning, RF gain, tone controls … even the outboard audio filters in my speaker enclosure. All helped to give me just enough of an edge to copy some of those “unreadable” stations. DSP RULES!
So, what’s the moral of this story? Use all the tools that you have available! Yes, many of the older radios have beautiful sounding audio and great sensitivity, but today’s modern radios offer many tools that were not even dreamed of when those radios were designed and built. We truly live in amazing times!!
73 de Dick N4BC