THANK YOU to everyone who posted replies to my question. An awful lot of info to digest and research.
Most everyone knows that when it comes to radio equipment, I’m an old school guy. I like the older equipment because there is plenty of space inside for modifications, it’s easy to work on, and, most importantly, a schematic is available.
I bought my Cobra 139Xlr new in 1978. The two areas that are really lacking are an SDR panadapter display and effective noise reduction for single sideband operation. I purchased an SDR-RTL dongle and transplanted it inside the 139XLR. The display options with this setup are numerous, but I utilize a spectrum and waterfall display most of the time.
I researched the DSP units recommended by forum members, and was impressed. Hate to say this, but too overpriced ($300 -500 dollars) for me. Or, like the Timewave DSP, Radio Shack DSP40 or MFJ DSP, are no longer available new.
After a lot of research, I settled on the
SOUNDFY 2.8 SSp Digital Crossover and Equalizer. This piece of gear does everything the member- recommended units do and much more. Only $60.00 too.
Unbelievable number of features, menu programmable. Eight individually selectable outputs. I daisy-chained the outputs so I can change my noise reduction at the push of a button. Still have a lot to learn about this unit. But for now have programmed eight slightly different bandpass configurations so I can select the best one for changing conditions. Connected between the 139’s AM/SSB detector output and the input to the audio amp. Now have hash and static-free receive at the push of a button. My temporary setup is a kluged mass of wiring. I’ll have a neater finished setup (and photos) in a few days. For now, it works and that’s the bottom line.
Thanks again for all the help guys. I owe you all one.
- J.J. 399