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Re: Re: LF: GRABBER

from [Andy Talbot] [Permanent Link][Original]
To: [email protected]
Subject: Re: Re: LF: GRABBER
From: Andy Talbot <[email protected]>
Date: Thu, 10 Mar 2011 16:42:49 +0000
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I think we have developed similar hardware with different processors:
 
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.

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