Date: Thu, 12 Nov 2015 19:34:52 -0330 (NST)
From: jcraig@mun.ca
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <5644DC3A.6060901@abelian.org>
Message-ID: <Pine.LNX.4.64.1511121923120.10833@plato.ucs.mun.ca>
References: <8D2EABAF0379B74-9084-3D874@webmail-vd017.sysops.aol.com>
 <8D2EB5632CCBBF3-2188-4C745@webmail-vd012.sysops.aol.com> <5644DC3A.6060901@abelian.org>
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Subject: Re: LF: VO1NA frequency
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Hi Paul,

Problem solved! I really messed up the encoded file but ebnaut
still gave the callsign and cat's name.  Amazing, isn't it!

I'll be on 477.7 for the next 2  days and will get back to work
on this with the tips from you and Markus.

73 & TNX
Joe VO1NA

PS the Rpi B takes forever to decode an uncorrupted file.
The university unix machine took several seconds.

On Thu, 12 Nov 2015, Paul Nicholson wrote:

> Joe VO1NA wrote:
>
>> I had to put in arguments for -S and -r which I chose at
>> random ...
>
> Thanks, that's a bug - it shouldn't need -S or -r when
> sending or receiving unmodulated symbols as text.
>
> Fixed now in version 0.2
>
> http://abelian.org/ebnaut/ebnaut.c
>
> Now you can do, for example
>
> echo 'TEST MESSAGE' | ebnaut -et -N12 -p 4K19A  > test.txt
> ebnaut -dt -N12 -p 4K19A < test.txt
>
> just to exercise the encoder and decoder without modulation.
> Have fun with a text editor scrambling the 1's and 0's in
> test.txt and watch the decoder fix the errors.
>
> On an Intel PC you can run the Windows ebnaut-tx.exe which
> works ok with wine.  This program drives the RS232 modem
> control outputs.
>
> For other computers you'll have to rig something up to read
> that file of 0's and 1's and use it to drive DTR and/or RTS
> on a serial port, or any of the parallel port bits, or a GPIO
> pin if the computer has one (eg RPi).
>
> If that's giving you an obstacle I can quickly rustle up a
> program to do it which will work on PC and RPi.
>
>> I send a long carrier with a phase inversion every time a 1
>> is encountered,
>
> That's a bit ambiguous, it could be taken to mean sending
> differential PSK.  To be clear: send one phase for a symbol
> period when the input is a 0, send the opposite phase for a
> symbol period when the input is a 1.
>
> With a transformer and a relay or diode ring, sending BPSK is
> hardly any more difficult than amplitude keying.
>
> --
> Paul Nicholson
> --
>
>