Koellner, Guenter wrote:
> Hello Tobias,
>
> just a question, maybe I am simply missing something from the user manual:
> How do you change
> Winrad L.O. frequency by, e.g. 25kHz. I only found the method of tuning with
> the mouse wheel,
> while havign the mouse pointer above the digits of the L.O. display. So one
> can change by 10kHz,
> but this will be rounded down and so no actual change will happen. Maybe I
> have missed some possibility.
>
> 73, Günter
Günter,
Tobias is right. You change with the mouse wheel by 10 kHz the LO, then
Winrad sends the new frequency to the DLL.
The DLL instead changes the PLL frequency by its minimum step, i.e. 25 kHz.
BUT, it then alerts Winrad of an LO
frequency change, by using the callback function with code 101, which means
that a LO frequency change, originated by
the DLL, has taken place. At this point Winrad asks the DLL about the actual LO
frequency, by using the GetHWLO call,
and uses the returned value for the screen display and for the computation of
the actual reception frequency, combining
that value with the value of its internal NCO. Looks simple and does not
require any change of the DLL interface
specifications.
73 Alberto I2PHD
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