Re: Re: Re: LF: GRABBER

[uwe-jannsen@kabelmail.de]

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

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

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I think we have developed similar hardware with different processors:

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

 

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

 

Andy

G4JNT

 

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

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

negative: the resolution (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. so it can generate near 8970,000Hz:  8970,022xHz or 8969,959xHz.