[time-nuts] broadband MPX signal stereo

Bob Camp lists at rtty.us
Thu Mar 15 21:06:51 UTC 2012


Hi

I think you will find that the 2020 is a bit noisy above 20 KHz...

Also there are a lot of chips that drop in a ~40 KHz low pass filter when
sampling at 196 KHz. It's a brick wall, so you get near nothing above the
cutoff frequency. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of ehydra
Sent: Thursday, March 15, 2012 2:44 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] broadband MPX signal stereo

I heard a broadband sound-card like EMU0202 should work.

I asked because of the various people on the list with expensive test
equipment one should be able to record a good sample.

Looks there is no interest.

- Henry


Azelio Boriani schrieb:
> Are you sure that a .WAV file can support the full MPX stereo and RDS
> signal? I suspect that you need raw samples that a sound card can't
handle.
> The output of a FM stereo and RDS radio discriminator are beyond the usual
> audio bandwidth. The output of the discriminator full bandwidth is first
> used by the RDS decoder and then (partially filtered) by the stereo deMPX
> and then by the audio processor.
> 
> On Thu, Mar 15, 2012 at 2:08 AM, ehydra <ehydra at arcor.de> wrote:
> 
>> Hi!
>>
>> I'm looking for a sampled wave-file from a radio receiver MPX-signal
>> including the RDS frequency band around 57KHz. I searched the Net but
found
>> just nothing that worked.
>>
>> So I ask here. Maybe someone has the possibility to sample a couple of
>> seconds.

-- 
ehydra.dyndns.info

_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.




More information about the time-nuts mailing list