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Re: Decoding SAFIR-1 from TRACE ON



Andy,

Give this page a try:  http://www.columbiaara.org/h2a.php.  Enter your hex
string (i.e.: 20 40 6F) into the top box and click on the "Convert" button,
the results of the conversion will be returned in the bottom box.  Hex
values above 7F will be divided by two before conversion.  Hex values that
convert to non-display character are replaced with a period.  You can then
copy the results to your clipboard.  This should be better then doing one
character at a time.

Best regards,
Bernie, K3BAZ

----- Original Message -----
From: "A Thomas" <70374.440@compuserve.com>
To: "Woodware LLC" <woodware@usa.net>; "amsat-bb" <amsat-bb@AMSAT.Org>
Sent: Wednesday, January 01, 2003 5:02 AM
Subject: Re: [amsat-bb] Decoding SAFIR-1 from TRACE ON


> Message text written by "Woodware LLC"
> >
> Help me with how you figured this out. According to what I remember about
> ASCII/HEX and DECIMAL and verified by
> http://www.fosh.com.au/Fosh/Support/hextoascii.htm
>
> D = 44 hex or 68 decimal
> A = 41 hex or 65 decmial
> T = 54 hex or 54 decimal
> A = 41 hex or 65 decimal
> 1 = 31 hex or 49 decimal
>
> 73's
>
> Don Woodward
> KD4APP
> AMSAT 33535
> kd4app@amsat.org
> http://kd4app.webhop.org
>
> <
> Don
>
> Sorry for any confusion. I typed this just over the New Year midnight and
> gremlins crept in, sorry!
>
>  i forgot to say that sometimes the decimal needs to be divided by 2 (I
> don't know why)
>
> The correct opening sequence is:
>
> D = 88 hex to dec /2
> A =82 hex  to dec/2
> T = a8 hex  to dec /2
> A = 82 hex   to dec/2
> 1 = 62 hex   to dec/2
>
> Convert these hex to decimal, divide by 2 and enter as ascii.
>
> I just put in a sequence to identify it not to decode it. For me the key
> hex is the sixth, 62, in a sequence of that length.
>
> You can also identify MH, INFO, DP0AIS etc in the early sequences this
way,
> but it is laborious. have a look at my early postings.
>
> You might also be interested in these thoughts  which i have sent onto my
> friend Rob G8ATE:
>
> COPY:
>
> From the AATIS website it is clear that there are many other functions
> onboard:
>
> a) a digital voice module, up to 60 seconds repeated every 2 minutes,
> commanded from the Ground station
>
> b) In orbit programming of the conrtol PIC
>
> c)A Cosmic ray test using a flash eeprom - I think this must be loaded
with
> zeros and continually scanned, the idea being to find a change due to a
> proton hit.
>
> d) telemetry - see below
>
> e) data beacon including cosmic ray tests
> f) M Heard of all uplinks heard
>
> g) it's planned to change the data beacon on 145825 to and from 1200 and
> 9600.
>
>
> Data thoughts
>
> looking at my and G8ATE's  decodes I think the data format of the 20 hex
> numbers (loaded into the program) is:
>
>
> 0
> 012345
>
> For the cosmic ray experiment?
>
> 0
> 67
> Temperature Board degrees C
>
> 0
> 89
> Temperature Board decimal degrees C
>
> 1
> 01
> Temperature PA
>
> 1
> 23
> Accu Volts
>
> 1
> 45
> Volts [5,5v]
>
> 1
> 67
> Volts{3.3}
>
> 1
> 89
> Bit Error
>
>
> However i think the telemetry may be useless as they report on their
> website that  the PIC controller has the least significant bit stuck on
0 -
> this they say applies to the "external memory" which gives false reading
on
> MH (Ithink it is giving  a false reading on the beacon as well).
>
> Between my two beacons (approx 1 day)
>
> NO CHANGE
>
> 0                          1
> 012345      89   456789
>
> CHANGE TO NIL
>
> 0
> 67
>
>
> UNBELEIVABLE CHANGE
> 1
> 0123
>
>
> So it doesn't look good for the beacon!
>
> Any thoughts??
>
> END
>
> Don,
> Sorry about any errors, please treat this as work in progress, as I have
no
> connection with AATIS! But what I am saying is that if you take TRACE ON
> and decode the hex, dividing by 2 if necessay, there seem to be good
> results. I'd be very interested in your results.
>
>
>
> andy g0sfj
> ----
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> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

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