开云体育

I understand with the existing hardware we cannot implement an WSPR transmitter.

How about an QRPp CW Beacon?

(an QRPp CW transmitter I can do it by connecting the output to the antenna through an straight key :P)

LPF is in our responsibility of course?

very cheap ones from

frequency will shift a little bit of course

?

Why? A couple of 2N3904s or 2N2222s and a small MCU would require less effort and give better performance.

Design a 3rd order Cauer filter with Elsie for the LPF. IIRC I got 60dB suppression of the 2nd and 3rd harmonics.

Have Fun!
Reg

HI,

I have already forgotten about WSPR ;)

73,

Bill KU8H

bark less - wag more

Not sure why I didn't think to mention this before. There is a very low cost, multimode (IBP, SPB, CW, FST4, FST4W, FT4, FT8, JS8, JT9, ModeX, PI4, WSPR, …) beacon already available:



Price is about the same as a tinySA and it includes a GPS module.

Have Fun!
Reg