[GreenKeys] Demod Bds & some help

[epvgk at limpoc.com]

On Fri, Sep 02, 2011 at 10:23:42PM -0700, Norm wrote:
> Hi
> I just received two of Eric Volpe's demod boards, anxious to wire them up and try them. they really look professional.  I have a demod ckt now, is there anybody out there wanting to tackle a mod board, or has someone built some already?  I would be interested in one or two.  Could someone help me out on this, someone awhile back a month or two, mentioned he had some rectifiers for sale.  It sounded like they were on boards also.  I must have deleted that message ,because I don't have it in my files.  Thanks Eric you done yourself proud.
> 
> Norm
> WB7WEQ 

A mod board is not impossible... Would this be for radio use, or something
else? It seems like it's a little more complex than the demodulator. 

I had a couple of ideas on how to do it cheaply but I'm curious what people 
would be after in terms of features - I suppose we'd need adjustable center 
frequency, split, output level, mark/space swap? Anything else? I suppose 
also it would have to be able to adapt to whatever loop voltage/current you 
threw at it, as well, and put out a nice clean sine wave. 
What about more fancy features like sending nulls when there's no data 
coming, to keep receiver in sync? That would of course require receiving, 
retiming and retransmitting the signal. 

eric