On 15/02/17 09:51, Ralph Mowery wrote:
In article ,
says...
Have you tried Software Defined Radio? Free software and under $10
for the USB based hardware will get you started.
I have been playing with them for about 2 years. They seem to work very
well and depending on the one you actually use, they go from about 25
MHz to 2 GHz. The sensitivity for them is about 1/2 of a microvolt for
FM. The things that can be done and free software is amazing to me.

The do all the common modes of ssb, am,fm, cw, and some other things
such as decoding pagers and even the transponders on airplanes.

Here is a link to some more info on them.

http://www.rtl-sdr.com/about-rtl-sdr/

Look for some software called sd sharp while you are at it.

The weaknesses are intermodulation due to insufficient RF band-pass
filtering, and quantization noise due to insufficient resolution in the
A/D converters. RTL2832 has ENOB of around 7... hopeless.

There's no escaping the need for a proper RF front-end for any serious work.