Message-ID: <004c01c07328$9e15f8a0$1a8701d4@g4jnt>
From: "Andrew Talbot" <G4JNT@thersgb.net>
To: rsgb_lf_group@blacksheep.org
Subject: LF: Re: New Years wish
Date: Sun, 31 Dec 2000 12:53:04 -0000
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The EVM56002 is obsolete anyway, they are like gold dust now !!
Motorola do an updated one with the 56300 (??) but it is very expensive and
will need EVM software to be modified.

Is 16 bits essential ?  This makes interfacing a bit complex.

Interfacing via the parallel port is easy enough in DOS and WIN 3.1 but in
WIN9x it is a bit hit and miss depending on the ports implementation.
16 bits via the serial port beeds really three bytes per sample.   It can of
course be sent directly as two 8 bit words, but there is no way of keeping
in sync and knowing which word is high / low etc.   By transmitting the 16
bits over 3 words, check bits can be included to positively identify which
word is which out of the frame of three.

However, by using 14 bits of data per sample (still well over 80dB dynamic
range) two 8 bit samples are possible, allowing one bit per word to identify
high/low data.

Andy  G4JNT


-----Original Message-----
From: Larry Kayser <kayser@sympatico.ca>
To: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
Date: 31 December 2000 03:44
Subject: LF: New Years wish


>Greetings:
>
>Simple and succinct.  A 16 bit A to D converter board that Alberto di Bene,
>Bill de Carle can make their software work with so we can go to the next
>level of digging in the noise.  With the return of AMSAT big bird there
will
>not be a large number of EVM56002 protoboards available at low cost so the
>need for an A to D board for general DSP is needed..
>
>Board could work with either a Serial port or a Parallel port.
>
>Happy New Year to all.
>
>Larry
>VA3LK
>
>
>
>
>