Hi Leif! > > You might try the "SOUNDCARD TEST MODE" of Linrad. Send a single > carrier into your RF hardware and look at what the audio card > sends into the digital hardware. (Works as a two-channel oscilloscope) > You should see two sinewaves that are of the same amplitude and > shifted by 90 degrees. If you see something else, maybe just a single > sinewave, something is wrong and it should be fairly easy to trace it. > > You may download Linrad.exe that should run under any Windows system > that has properly installed drivers for the soundcard. > http://www.sm5bsz.com/linuxdsp/linrad.htm > > 73 > > Leif / SM5BSZ > I installed the software but couldn't get any signal on the screen, just noise. But ok, I just have to study the program :) These ASIO soundcards are driving me grazy, especially E-MU, the software is just too complicated. Btw, this was my first touch to Linrad. You have done some awesome work Leif!
Just a hypothetical question, what if my local oscillator signal isn't pure? I use 74AC74 as a /4 and am feeding it with a simple oscillator, which is basically a inverter (I think 7404) crystal oscillator (14.4MHz). Can this be the cause for my IQ balance error? Thank you really much! 73 de Janne, OH1GTF
