Re: Spyverter R2 with USRP B210 #shortwave


On Sun, Feb 17, 2019 at 08:00 PM, <erik@...> wrote:
Now, I'm not expecting any signals <120MHz.
Not sure if you fully understand how converters (or any RF mixers) work, but that's perfectly expected. The signals are mixed with a 120 MHz LO. The positive image falls between 120 and 180 MHz, and the negative (inverted) image falls between 60 and 120 MHz. OTOH, the BPF at the output is optimized to attenuate the harmonics, not the negative image.

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