[aprssig] Si1000 direct modulation mode

Jason Rausch jason at ke4nyv.com
Wed Oct 17 18:18:33 EDT 2012

The YagTracker (http://www.rpc-electronics.com/yagtracker.php) uses an SI3000 codec IC for doing both generating and decoding 1200 baud packets.
Jason Rausch - KE4NYVRPC Electronics, LLCwww.rpc-electronics.com

--- On Wed, 10/17/12, Greg Clark <k7rkt at bigredbee.com> wrote:

From: Greg Clark <k7rkt at bigredbee.com>
Subject: [aprssig] Si1000 direct modulation mode
To: "TAPR APRS Mailing List" <aprssig at tapr.org>
Date: Wednesday, October 17, 2012, 5:54 PM

I'm trying to make my Si1000 development board  transmit direct tones with the hope of being able to generate APRS data packets.
has anyone tried this?  I'm trying to modify the TxTone example and toggle one of the output ports at 1200 hz and route it to one of the GPIO pins that's setup for direct modulation. I do see the I/O pin toggling, however all I get is a constant carrier, no tone.

Has anyone else done this?
Greg K7RKT

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