Re:Tiny Ten DSP-Based HF Transceiver
by th0ma5 on Thursday March 06, 2025 @02:53AM
(#43277587)
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.
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Re:Tiny Ten DSP-Based HF Transceiver
by mschuster91 on Thursday March 06, 2025 @04:12AM
(#43278080)
> 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?
I would imagine he was talking about running WSPR.
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.