Recently I found AN-691 (using RF Detector products at low frequency) at: http://www.analog.com/static/imported-files/application_notes/AN-691.pdf
What I'm looking for the equivalent for SDR products.
While there are plenty of chips and designs that work in the hundreds of megahertz - even gigahertz - I am looking for solutions that work in the traditional HF bands, ie. 1 - 50 MHz.
Which products are capable of working at these lower frequencies?
What performance issues can I expect, as a result of working outside specified operating range?