Decoding Radiosonde tones

Archiver

I am trying to decode the signal from a surplus Radiosonde (RS80-15N)
for use in a weather station. The signal consists of a string of 6
audio tone bursts (250 ms) that repeat every 1.5 seconds. I am using
the PULSEIN function on a BS2. Although PULSEIN works well, a few
tones get left out (approx 1 every 25 bursts), most likely because
the synchornization is off.

Question: Since there is no IRQ on the BS2, is there a way of
ensuring consistent synchronization of the input signal?

Thanks

Archiver

Is there a sync tone? if so then put a pulsin in a loop and
look for the sycn then read the rest of the tones.

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Original Message

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From: <donald_desaulniers@h...>
To: <basicstamps@yahoogroups.com>
Sent: January 25, 2003 4:14 AM
Subject: [noparse][[/noparse]basicstamps] Decoding Radiosonde tones


: I am trying to decode the signal from a surplus Radiosonde
(RS80-15N)
: for use in a weather station. The signal consists of a
string of 6
: audio tone bursts (250 ms) that repeat every 1.5 seconds.
I am using
: the PULSEIN function on a BS2. Although PULSEIN works
well, a few
: tones get left out (approx 1 every 25 bursts), most likely
because
: the synchornization is off.
:
: Question: Since there is no IRQ on the BS2, is there a way
of
: ensuring consistent synchronization of the input signal?
:
: Thanks
:
:
: To UNSUBSCRIBE, just send mail to:
: basicstamps-unsubscribe@yahoogroups.com
: from the same email address that you subscribed. Text in
the Subject and Body of the message will be ignored.
:
:
: Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
:
:

Archiver

Larry

Thanks for the advice. Your suggestion is excellent.

However, I believe that four of the tone (Press, Temp1, R.H. and Temp2) can
vary within the range set between the High ref (K1) tone and the Low ref.
tone (K2). If per change one of the signals goes up or down to the either
endpoint, the algorithm could generate a false sync. On the other hand if
this should occur, it would be at the extreme operating range of the sensors
(T=-90C or +60 C) as far as weather conditions go.

Regards from Montreal Canada at -22C (-8F)








>From: "Larry Gaminde" <lgaminde@t...>
>Reply-To: basicstamps@yahoogroups.com
>To: <basicstamps@yahoogroups.com>
>Subject: Re: [noparse][[/noparse]basicstamps] Decoding Radiosonde tones
>Date: Sat, 25 Jan 2003 08:11:10 -0800
>
>Is there a sync tone? if so then put a pulsin in a loop and
>look for the sycn then read the rest of the tones.
>

---

Original Message

---

>From: <donald_desaulniers@h...>
>To: <basicstamps@yahoogroups.com>
>Sent: January 25, 2003 4:14 AM
>Subject: [noparse][[/noparse]basicstamps] Decoding Radiosonde tones
>
>
>: I am trying to decode the signal from a surplus Radiosonde
>(RS80-15N)
>: for use in a weather station. The signal consists of a
>string of 6
>: audio tone bursts (250 ms) that repeat every 1.5 seconds.
>I am using
>: the PULSEIN function on a BS2. Although PULSEIN works
>well, a few
>: tones get left out (approx 1 every 25 bursts), most likely
>because
>: the synchornization is off.
>:
>: Question: Since there is no IRQ on the BS2, is there a way
>of
>: ensuring consistent synchronization of the input signal?
>:
>: Thanks
>:
>:
>: To UNSUBSCRIBE, just send mail to:
>: basicstamps-unsubscribe@yahoogroups.com
>: from the same email address that you subscribed. Text in
>the Subject and Body of the message will be ignored.
>:
>:
>: Your use of Yahoo! Groups is subject to
>http://docs.yahoo.com/info/terms/
>:
>:
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/


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