Fwd: Frequency Xlating Fir Filter issue passing message

[Vitt Benv]

Sorry, this is for the list... replayed only to Marcus ....

---------- Forwarded message ---------
Da: Vitt Benv <address@hidden>
Date: sab 21 mar 2020 alle ore 16:11
Subject: Re: Frequency Xlating Fir Filter issue passing message
To: Marcus D. Leech <address@hidden>

Good afternoon,

yes Marcus, just a "quick look"!

It's clear to me how freq.xlatinf.filter works, and I'm quite shure that I'm working on BB signal...

But it's my mistake, I want to apologize to the list: I was passing on the output port the wrong type ( int vs float) and (worst, shame on me) the wrong variable... acc, this "social containment" for the COVID19 has bad effects!

So, anyway, tnx for ur replay and, again sorry for the noise ;-)

Vittorio

Il giorno ven 20 mar 2020 alle ore 22:49 Marcus D. Leech <address@hidden> ha scritto:

On 03/20/2020 05:10 PM, Vitt Benv wrote:

Good evening,

I'm trying to make a multimode receiver using a PlutoSDR; all the demodulation and visualization parts work correctly.
Now I would like to use a click'n-point tuning and as a result I have tried to understand something more about the use of controlports.
I followed some tutorials and made a custom block (myblock.py "Message splitter") which receives the message generated by double clicking on the waterfallas an input and
generates a message to be sent to the Frequency Xlating Fir Filter block, which consists of an offset between the center frequency (fx) and the frequency generated by the double click.
I state that by controlling this block with a slider (fx_tune) everything works correctly, but using the outgoing message the set frequency is completely incorrect.
In the embedeed block I perform an output of the variables involved directly on the console and everything "apparently" is correct.
Any ideas / suggestions?
Attached is the .grc file, the source of the "Message splitter" block and a printscreen of the blocks (I have eliminated what is unnecessary and already functional).
Thanks in advance,

Vittorio, I3VFJ

Quick look suggests that you're confused about how the freq-xlating-filter works.  The center frequency is the *baseband* frequency, not
  the RF frequency that your hardware is tuned to.  Gnu Radio, internally, deals with basebanded signals, typically, and the RF frequencies
  are purely hardware-on-the-outside thing.