I do not have a strong foundation in RF. I have been doing some research but I still do not properly grasp what it means if a receiver/antenna can do DC to X Hz. For example this Funcube Upconverter, http://www.ct1ffu.com/site/hf-converter.pdf, can do from DC to 1700 MHz.
When they say DC do they really mean 0.0 Hz? Or would it be more precise to say 1 MHz for example?
I ask because I am interested in purchasing or assembling an SDR that can do LF (~100kHz) as well as higher frequencies. Obviously there is a big difference between 100kHz and 1MHz and I am wondering what exactly it means when the range goes from DC up to some value.
Is it a hard-value or a vague/fuzzy value/term?
Out of further curiosity, if it's synonymous with 0.0 Hz by don't list a raw number like "0.0" instead of "DC" - is there some other significancy? Is it because it doesn't radiate (i.e. technically it's not RF) - it requires a conductor like a wire?