osmo Fl2k TX filtering strategies?

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dial-a-monkey
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Joined: Sat Aug 25, 2018 4:17 am

osmo Fl2k TX filtering strategies?

Post by dial-a-monkey » Sat Aug 25, 2018 4:34 am

It's cool to be able to TX at a huge range of frequencies using the Fl2k dongle, but I can see (using my rtl-sdr) the harmonics are a big issue.

Can anyone suggest a good strategy for a flexible frequency (broadband) - bandpass filtering solution?

I wondered about switching in/out a range of discrete, ceramic,saw or crystal bandpass filters - a bit of a hassle to say the least.

I had also wondered if it might be possible to mix in an opposite phased signal in all but the desired frequency.

I wonder how this flexibility/broadband filtering is achieved in a analogue HF transceiver like a Icom 802?

Thanks for any ideas or input.

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