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Re: Re: Re: LF: GRABBER

from [uwe-jannsen] [Permanent Link][Original]
To: [email protected]
Subject: Re: Re: Re: LF: GRABBER
From: [email protected]
Date: Thu, 10 Mar 2011 18:32:39 +0100
Reply-to: [email protected]
Sender: [email protected]
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: [email protected]
Gesendet: 10.03.2011 16:42
An: [email protected]
Betreff: Re: Re: LF: GRABBER

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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