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Date: Sat, 5 Mar 2011 21:42:21 +0000
Message-ID: <AANLkTinJbSX+dhBsQqgq=oW74yi_HXgMH1ykjzQHj5tw@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org, David GM6BIG <freevil@tiscali.co.uk>
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Subject: LF: Updated PIC LF DDS
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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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<div>=A0</div>
<div>The PIC DDS design useful for generating frwquencies up to a round 10=
kHz , mentined here earlier and which can be found at </div>
<div><a href=3D"http://www.g4jnt.com/PIC_DDS.pdf" target=3D"_blank">http:/=
/www.g4jnt.com/PIC_DDS.pdf</a>=A0=A0=A0 and=A0=A0 <a href=3D"http://www.g4=
jnt.com/PIC_DDS.zip" target=3D"_blank">http://www.g4jnt.com/PIC_DDS.zip</a=
>=A0=A0 has been updated.</div>

<div>=A0</div>
<div>It now includes an=A0additional =A0version using a 16F870 PIC that ge=
nerates a dual channel I/Q output for direct image cancelling RF upconvert=
ers.=A0 It=A0offers two-tone FSK switchable between coherent Frequency Exc=
hange Keying (recommended for VLF allowing ultra narrow band detection of=
 one of the tones in bandwidths &lt;&lt; keying rate) =A0or normal phase-c=
ontinuous mode.</div>

<div>=A0</div>
<div>Andy</div>
<div>G4JNT</div>
<div>=A0</div>
<div>=A0</div>
<div>=A0</div>

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