Hello Bill,
---
- We humans have the capability to do amazing things if we work together.
- Nós seres humanos temos a capacidade de fazer coisas incríveis se
trabalharmos juntos.
On Thu, Feb 19, 2015 at 11:21 AM, Bill Somerville <g4...@classdesign.com>
wrote:
>
> I would like insert some code on WSJT-X to interface it with a software
> that will drive the DDS. For this I am thinking of writing the TX symbols
> to a file and have the file monitored. When a change to the file is
> detected the driver software reads the symbols and activate the TX.
>
> While it might be very easy to convert the symbol stream directly to MFSK
> output, I would have thought that the extra work to accept a generic 16-bit
> LE sample stream would be of far greater use in many applications? Do you
> gain anything in performance by direct synthesis from symbols as opposed to
> modulating from a sample stream?
>
>
> Consuming the raw samples would make things unnecessarily complicated. All
that I need is the 85 symbols. I read each symbol one-by-one and map each
one to the correct DDS frequency word for direct RF synthesis. This will
generate a very clean RF signal.
> Do you think it would it be of interest to have the changes committed to
> WSJT-X repository? The only addition will be the creation and update of one
> file when the TX is activated. No other changes will be necessary.
>
> How are you going to maintain the required time synchronization?
>
>
>
There will be a very small delay between the TX event in WSJT-X and reading
the file and triggering the actual TX. But I expect this to be in the order
of a few milliseconds. I don't think this will have any significant impact.
The important sync work will be done by the QFIleSystemWatcher class in Qt.
I intend to perform some instrumentation to measure the actual times.
73, Edson PY2SDR
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