Take a look at this flow graph for some tips.
https://github.com/argilo/sdr-examples/blob/master/multi_tx.grc
https://github.com/argilo/sdr-examples
Ron
On 10/19/19 22:36, Matteo Campanella wrote:
Hello, I am trying to design a flow which implements a transmitter
with two sources (a signal generator or an audio source), two
modulator flows (nbfm and am) and a single sink (my hackrf device via
osmosdr block).
The idea would be to make the sources and modulators switchable via a
GUI drop down; since I noticed the select has been deprecated as
module, my idea was to use a matrix multiplier between sources and
modulators flows (2 inputs, 2 outputs) and a matrix multiplier (2
inputs one output) between modulator flows and sink.
I've noticed that this does not work. As long as I have one matrix
multiplier only, with the two flows never recombining again,
everything is fine; as soon as I add the output matrix multiplier, the
whole graph gets stuck.
I'm pretty sure it has to do with the synchronization of blocks, but I
can't find a solution... anyone has a hint of how to make things work?
The problem happens even if I swap the output matrix multiplier with
an adder.
here is the grc -
https://bitbucket.org/matteone/gnuradio/src/master/TX/HackRF-nbfm-am-Transmit.grc
best 73 de iz2eeq
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