AVR-Chat

Zack Widup wrote:
> On Tue, 29 Mar 2005, Ralph Hilton wrote:
> 
> 
>>On Mon, 28 Mar 2005 18:08:20 -0000 you wrote:
>>
>>
>>>Hi,
>>>   There are groups for AVR and ATMega which I would like to share
>>>with all.
>>>
>>>http://groups.yahoo.com/group/AVR_Microcontroller
>>>http://groups.yahoo.com/group/ATMega_Microcontroller
>>
>>Too many groups get to be a pain!
>>--
>>Ralph Hilton
> 
> 
> Yes, that's for sure.  I recall when I started using AVR's I looked for 
> groups on Yahoogroups and came up with half a dozen or so.  I picked a 
> couple and joined them.  I eventually ended up on this group, which is the 
> only one with much activity.
> 
> There is another one, AVR-DEV, set up by Diz W8DIZ of Parts and Kits 
> (http://www.partsandkits.com).  He has been trying to develop a ham radio 
> transceiver called the MultiPIG with an AVR controlling an AD9850 DSP 
> chip.  
> 
> The last I heard from Diz, he had all but given up on the AD9850 for 
> wide-frequency use because the unwanted spurs on the output were causing 
> all sorts of intermod and noise floor problems and he wasn't getting the 
> desired result.  
> 
> I've used the AD9850 in a very narrow-band receiver with a narrow filter 
> on the output (500 kHz wide at 12 MHz) and it seemed to do a lot better, 
> but if you're trying to use the 9850 as the LO for the entire shortwave 
> spectrum this becomes a big problem.
> 
> So I haven't seen a posting to that group in months, either.
> 
> This is the best AVR group as far as I'm concerened.
> 
> Zack W9SZ

Multiple groups thin out the expertise. I could have told yas years ago
about receiver design, dds spurs, and what to do with'em.