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LF: WOLF test results, soundcard trouble

To: [email protected]
Subject: LF: WOLF test results, soundcard trouble
From: "Talbot Andrew" <[email protected]>
Date: Tue, 24 Apr 2001 16:28:56 +0100
Reply-to: [email protected]
Sender: <[email protected]>
An alternative to the SD interface is my PIC based one, which is
directly compatible and uses just two ICs one of them an op-amp.

Andy  G4JNT
Rik's idea of bypassing the card is another good solution.
One alternative that already exists is the VE2IQ interface.  See and download SDPCX.ZIP .
This is a home brew Sigma-Delta A/D which drives a serial port.
Many PSK and CCW programs can use it, and it has also been used with WOLF.
You can buy kits from Bill for US$54, or build your own from scratch.
Sample rate is a precise 7200 Hz.  Resolution is only 8 bits,
but IMO that is plenty, unless the audio signal is dominated
by a strong interfering carrier.  If most of the audio power is
random noise and/or static crashes, then even 1 bit is pretty good!
Steve VK2ZTO has shown impressive results sampling this way.

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