On 20/05/2013 08:32, g3zjo wrote:
On 20/05/2013 07:56, Hans Summers wrote:
I think that at 80m, some of what you observe is just features of the
decode process on such a strong signal. Can you put in some
attenuation so that the line is thinner?
I think the tone spacing is probably Ok on 80m, once you do that. The
problems come in, at the higher bands where too much precision is lost.
Hi Hans
The wide line is due to the resolution which I have pushed up, to make
it clearer in fact. Yes there is some inevitable spread. Of course I
will add some attenuation for you and see what I can do.
However please observe and consider:-
I have increase the requested steps to 10 Hz total
There are 12 steps in the message
Only 8 discreet steps are present
The total pattern does not achieve the 10Hz expected
Each step will be 0.833Hz
The shift achieved is around 6Hz
8 steps times 0.833 equals 6.666Hz
I am glad I did the test then I was not sure at what stage you were at
in the solution.
73 Eddie
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Hans, Eddie
Are you running out of resolution in step size here? What's the actual min resolution the DDS can give with a 125MHz xtal?
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73
Barry, G8AGN
