Hello!
Some day ago I released verision 1.0 of TLMRS17 and I wrote:

>I'm very glad to hear Sputnik 40 (or RS17 if you prefear) and so I'we tried to
>decode its simple telemetry.
>It was too difficult to syncronize frequency meter and get a reliable reading, I
>could try to use Lissajus figure but it did seems to me an old time method.
>More I've never used DSP technique to solve any problem, so the program TLMRS17
>is my first attempt to use DSP on a PC.

This is still true, minor changes has be done and a Linux porting added, so here
is the new description, but before of this I apologize to forgot this before:

********************************************************************************
                              ACKNOLEDGEMENT
********************************************************************************
      This code use the FFT routine by Philip VanBaren, I found it within
      an FFT based program called:
      "Freq, a spectrum analyzer program for DOS, Linux, Linux/X, and Sun"
      the autor precise that:

      "This program is free software; with the exception of the sound card
      sampling routines, which are copyright by their respective authors,
      you can redistribute it and/or modify it under the terms of the GNU
      General Public License as published by the Free Software Foundation;
      either version 2 of the License, or (at your option) any later version."

      So I'm very thank to him releasing source code. The very intersting
      program can be found in a packet called FREQ51.ZIP and the autor signed
      the doc as "Philip VanBaren   Internet:    phillipv@eecs.umich.edu"

********************************************************************************
********************************************************************************






      Sputnik-40 (RS17)       Telemetry Decoder  v1.1           IK5NAX
      ================================================================

This program is free: This program is absolutely free: copy, spread elsewere you
====================  like, I'd like no charge will be added. I don't furnish
                      source code only because I'm working on a larger program
                      based on the same routine that will be released in the
                      (I hope next) future, this time with all source and
                      description, so be patient a while (See below for Linux).

How it work: TLMRS17 perform a fft on the .wav input file and then calculate snr
===========  on each chunk of data (half fftlen) to find a dominant frequency.
             If snr is above the user defined trheshold then the dominant
             frequency is printed in the TLM.OUT output file with the relative
             temperature, more snr is printed and chunk number.

Read the output: The following examples is obtained from a sample of passage of
===============  Mon 17/11/97 at about 0711UTC at my home QTH (JN53OT) with a
                 fully stearable 6x6el yagi.

                 Sputnik 40  (RS-17)          Telemetry decoder   v1.1   IK5NAX

                 Filename: s1711c        FFTlen 256 points       SNRthr 15 dB

                         Freq[Hz]        Temp[C]        SNR[dB]      Chunk

                 Beep #1
                         1248.9          20.54           17.8            #1
                         1248.9          20.54           18.4            #2
                         1248.9          20.54           16.9            #3
                         1248.9          20.54           17.5            #4
                         1248.9          20.54           18.9            #5

                 Beep #2
                         1248.9          20.54           18.1            #30
                         1248.9          20.54           19.3            #31
                         1248.9          20.54           19.5            #32
                         1248.9          20.54           20.6            #33
                         1248.9          20.54           19.0            #34
                         1248.9          20.54           19.1            #35

                 Beep #3
                         1248.9          20.54           20.6            #60
                         1248.9          20.54           21.3            #61
                         1248.9          20.54           21.6            #62
                         1248.9          20.54           21.6            #63
                         1248.9          20.54           21.0            #64
                         1248.9          20.54           21.1            #65
                         1248.9          20.54           15.4            #66

                 Beep #4
                         1248.9          20.54           20.1            #90
                         1248.9          20.54           20.8            #91
                         1248.9          20.54           21.1            #92
                         1248.9          20.54           21.4            #93
                         1248.9          20.54           20.3            #94
                         1248.9          20.54           21.8            #95
                         1248.9          20.54           21.3            #96

                  From this you can see that this new version try to number
                  beeps, but wave file chunk number are again showd. When the
                  SNR is low is possible that the same real beep will be divided
                  into more beep# but you can realize it looking at chunk#.
                  Decimal number are reduced (they are too many yet!) since they
                  weren't meaningfull.

                  For freq to temp conversion I've used this function
                  t=2.655e-7*f^3-6.242e-4*f^2+.5321*f-187.6 that has been
                  obtained interpolating a table found on a packet message.

Linux porting: For the reason I've said before I don't release the source code,
=============  since some OM asked me it to port under Linux I've tried to
               compile it (I'm not skilled with linux) hoping this could run on
               other system than mine. If this not write me, I'll try to make
               all possible. The executable included with this package is called
               TLMRS17B.LNX.

Hope this help you to make TLMRS17 working. Thank to everybody who contact me in
this day about this program, sending me suggestion and decoded data too, I'll be
interstes in knowing your experience with it again.

If you want to contact me:
      Lapo Pieri IK5NAX   via A.dei Corbizi 9   I-50127  FIRENZE ITALY
      ik5nax@ik5ckl.#po.itos.ita.eu
      lapo@p6boss.iroe.fi.cnr.it (I read it once a week no more!)
      phone  +39 55 410209

73 de Lapo IK5NAX
