--- In [email protected], Philip Pemberton <[EMAIL PROTECTED]> wrote:
>
> Does anyone have a recording, either in WAV or MP3 format, of a
> minute or so of an AM broadcast (preferably in English -- I usually
> use Virgin Radio on 1215kHz MW, or Radio 4 on 198kHz LW), recorded
> at the output of the 12kHz downconverter?
>
Phil,
I don't have such a recording, but have tried to synthesize one.
I made a 2 minute I/Q recording of AM spectrum received with Perseus,
centered at 1122 kHz, at a sampling rate of 125 kSamples/sec, 24-bit
integers. At 12 kHz from that center frequency, i.e. at 1134 kHz there
is Voice of Croatia, which in that moment was transmitting music.
Then, using Adobe Audition, I resampled that recording down to 48
kSamples/sec, 16-bit integers.
I have uploaded it to http://sundry.i2phd.com/VoiceOfCroatia.wav
It is a 25+ MB file
Then, just to let you listen at how it should sound, I played it
through Winrad tuned at 1134 kHz, ECSS mode, and made a shorter (about
1 minute) recording of the demodulated audio, compressed to mp3.
I uploaded it to http://sundry.i2phd.com/VoiceOfCroatia_demod.mp3
It is a 200 kB file.
I hope they are useful for your tests.
73 Alberto I2PHD
