Sure, just do the Zeta SDR schematic in reverse, but like others have said you'd have to figure out the rest of the chain as well as a ton of filtering. I've transmitted with direct digital synth chips as well as rpitx which is literally bit-banging RF off of a pin on a raspberry pi with NTP sync even. Again, still had to do a lot of filtering, but with wsprrypi I was able to be heard one time in New Zealand from Ohio, USA without any amplification.
> Again, still had to do a lot of filtering, but with wsprrypi I was able to be heard one time in New Zealand from Ohio, USA without any amplification.
Hope you got a QSL card out of that kind of DX effort. What antenna did you use?
Yes WSPR ... The acknowledgement of contact was online. I had an MFJ antenna tuner but it was just a long strand of wire lying over the roof maybe 14 gauge? Slim. Something like 100mw output power? 200mw Maybe? It ran for a couple years unattended and was regularly heard east of the Mississippi and sometimes with some regularity in Europe.
