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Hi Andy,

 I do use a homebrew version of the famos ZL1BPU lf exciter.
 pse see:

 http://www.qsl.net/zl1bpu/MICRO/EXCITER/Index.htm

 regards
 Uwe/dj8wx

  Von: rsgb_lf_group@blacksheep.org
 Gesendet: 10.03.2011 16:42
 An: rsgb_lf_group@blacksheep.org
 Betreff: Re: Re: LF: GRABBER

I think we have developed similar hardware with different processors:=20

http://www.g4jnt.com/PIC_DDS.pdf=20

What size A/D and sine lookup table do you use ?=20

Andy=20

G4JNT=20

no divider in use. the accurate sine wave is generated by the high speed=
 microcontroller AT90S2313followed by a R matrixc and a =A0lowpass filter=
 cutqrg 10kHz..=20

the phase is GPS sychronized. the time is locked to GPS 1pps.=20

negative: the resolution (step size) is 0,3mHz (32-bit). theoretically. re=
ally: 63xmHz. the eeprom doesnt take any notice of the last two signs of=
 the HEX group.=A0so it can generate near 8970,000Hz: =A08970,022xHz or 89=
69,959xHz.

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<span style=3D"font-family: Arial; font-size: 13px;">Hi Andy,<br />
<br />
I do use a homebrew version of the famos ZL1BPU lf exciter.<br />
pse see:<br />
<br />
http://www.qsl.net/zl1bpu/MICRO/EXCITER/Index.htm<br />
<br />
regards<br />
Uwe/dj8wx<br />
<br />
<br />
<hr />
Von: rsgb_lf_group@blacksheep.org<br />
Gesendet: 10.03.2011 16:42<br />
An: rsgb_lf_group@blacksheep.org<br />
Betreff: Re: Re: LF: GRABBER<br />
<hr />
<br />
<div>I think we have developed similar hardware with different processors:=
</div>
<div><a href=3D"http://www.g4jnt.com/PIC_DDS.pdf">http://www.g4jnt.com/PIC=
_DDS.pdf</a></div>
<div>&nbsp;</div>
<div>What size A/D and sine lookup table do you use ?</div>
<div>&nbsp;</div>
<div>Andy</div>
<div>G4JNT</div>
<div><br />
<br />
&nbsp;</div>
<div class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid #cccccc;=
 margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"><span style=3D"font-family=
: arial; font-size: 13px;">
<p style=3D"margin-bottom: 12pt;"><span lang=3D"EN-GB">no divider in use.=
 the accurate sine wave is generated by the high speed microcontroller AT9=
0S2313followed by a R matrixc and a &nbsp;lowpass filter cutqrg 10kHz..</s=
pan></p>
<p style=3D"margin-bottom: 12pt;"><span lang=3D"EN-GB">the phase is GPS sy=
chronized. the time is locked to GPS 1pps.</span></p>
<p style=3D"margin-bottom: 12pt;"><span lang=3D"EN-GB">negative: the resol=
ution (step size) is 0,3mHz (32-bit). theoretically. really: 63xmHz. the=
 eeprom doesnt take any notice of the last two signs of the HEX group.&nbs=
p;so it can generate near 8970,000Hz: &nbsp;8970,022xHz or 8969,959xHz.</s=
pan></p>
</span></blockquote></div></span>

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