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| To: | [email protected], David GM6BIG <[email protected]> |
|---|---|
| Subject: | LF: Updated PIC LF DDS |
| From: | Andy Talbot <[email protected]> |
| Date: | Sat, 5 Mar 2011 21:42:21 +0000 |
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The PIC DDS design useful for generating frwquencies up to a round 10kHz , mentined here earlier and which can be found at
http://www.g4jnt.com/PIC_DDS.pdf and http://www.g4jnt.com/PIC_DDS.zip has been updated.
It now includes an additional version using a 16F870 PIC that generates a dual channel I/Q output for direct image cancelling RF upconverters. It offers two-tone FSK switchable between coherent Frequency Exchange Keying (recommended for VLF allowing ultra narrow band detection of one of the tones in bandwidths << keying rate) or normal phase-continuous mode.
Andy
G4JNT
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