GNURadio Amplitude Modulation

[@sanjaybhatikar]

Extremely useful! Thank you!

[@andremartins9799]

Excellente stuff! Thank you sir, could I ask, how have you managed to control the bandwidth?

[@VE6EY]

You will notice various FIR filters in the processing chain. But in particular, the AM Demod component has a passband filter set to 10 kHz.

[@qalibalili]

@VE6EY Hi! Could you please explain why there is multiply by 1 block between AM Demod and Audio Sink blocks? I have seen it also in digital transmissions, but still could not figure it out why.

[@VE6EY]

Hi Qalib. That's the volume control.It's controlled by the Volume slider in the display window. Cheers, John.

[@singlehanded12]

Awesome work.

[@scrambledmandible]

So this may be a dumb question, but how would you connect this to a proper SDR sink? My initial thoughts would be taking Multiply->Rational Resampler(Int:25 Dec:6 Float->Complex to get a sample rate of 2M) -> SDR Sink I also wish to broadcast at 1.7MHz (empty broadcast AM freq), to see if my radio will take the signal, would it just be a matter of editing the carrier?

[@cesaraugusto3554]

hi, do you have the diagram in gnuradio with DSSS modulation? Gretring frim colombia

[@sohilahisham3547]

i have problem with lables name (SC , TC) is not defined & notbook lables are not defined also ??

[@VE6EY]

Hi Sohila. SC=suppressed carrier TC=transmitted carrier.

[@nazli-p6r]

Hi Why i miss WX GUI in m'y GNU radio installation (on ubunto20.04.2.0)

[@rawalsaeedawan5134]

Can you plz provide me with the GRC file because i am unable to locate it on the website that you have posted in description.

[@VE6EY]

Download from here: play.fallows.ca/wp/radio/software-defined-radio/gnuradio-amplitude-modulation-receiver/

[@elyaserbenguno5464]

@@VE6EY Sorry sir, do you have another link? because I can't access it. Thank you in advance

[@VE6EY]

@@elyaserbenguno5464 I just tested the link and it works.

[@narongrittasingkham2569]

How I find files in the "WAV File Source" ?

[@VE6EY]

I did not post them. Just record some yourself.

[@andremartins9799]

Is there a reason to use the block 'Add Constant' in this AM scenario? I have already seen this use on carrier signal aswell before the multiply block. But haven't really found the reason why? Thanks in advance and a happy new year.

[@VE6EY]

Hi Andre. You add a constant to make sure the modulation never drops below zero, i.e. remains positive.

[@andremartins9799]

@@VE6EY Thank you!

[@fildharidhia2307]

thank you so much, can i use this for my assignment?

[@VE6EY]

Sorry for late response. Yes.

[@notchippy]

do you know how to make an am stereo? i already have the TX and the RX

[@VE6EY]

Sorry, no cris. Should be possible as GNR makes it easy to work with quadrature signals (QAM etc.)

[@bart10pont]

could you make it more complicated

[@Theoo000]

There is always a bigger fish