When I looked into the attached graphical flowgraph in the first email, the
signal was multiplied by zero (constant multiplier) before feeding into
file sink and audio sink. In this case what you get was probably amplified
noise.
Was it zero or something else?
On Fri, Apr 25, 2014 at 11:54 PM,
This, is a squelch, variable changes between 0 and positive gain value.
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On Mon, Apr 28, 2014 at 1:24 PM, Activecat active...@gmail.com wrote:
When I looked into the attached graphical flowgraph in the first email,
the signal was multiplied by
On Fri, Apr 25, 2014 at 04:14:30PM +0400, Anton Komarov wrote:
Hi, you can find in attach AM demodulator grc file. Everything is
straight forward with demod but audio file generated looks weird. Only
positive values of amplitude.
The particular definition of amplitude adopted by GNU Radio
But when we have only positive values that means in fact we have 0.5 DC
offset, and that is bad. Moreover i've made test recording with GQRX -
waveform is fine! Looking into the code, nothing special, am
demod-low-pass-wav-sink.
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public PGP key
http://pastebin.com/dqZqgyVE
On Fri, Apr 25,
On Fri, Apr 25, 2014 at 05:25:54PM +0400, Anton Komarov wrote:
But when we have only positive values that means in fact we have 0.5
DC offset, and that is bad. Moreover i've made test recording with
GQRX - waveform is fine! Looking into the code, nothing special, am
demod-low-pass-wav-sink.
Thanks a lot. It does work!
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public PGP key
http://pastebin.com/dqZqgyVE
On Fri, Apr 25, 2014 at 5:41 PM, Michael Ossmann m...@ossmann.com wrote:
On Fri, Apr 25, 2014 at 05:25:54PM +0400, Anton Komarov wrote:
But when we have only positive values that means in fact we have 0.5
DC
An AM demodulator is a squaring function. It can only *ever* produce positive values. You can remove DC offset by using a high-pass filter after it.
on Apr 25, 2014, Anton Komarov anton.koma...@gmail.com wrote:
But when we have only positive values that means in fact we have 0.5 DC offset,
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Actually I'm a little confused - Is seeing an AGC in an AM demodulator
something you usually do?
Especially the feedforward AGC should be rather err jumpy with a scope
of but 256 samples, unless I'm missing something; f_sample seems to be
1024ksps,
Marcus, w/o AGC audio sometimes is creapy. I have tested AGC2, tried to
play with attack and decay, but at last when there is a plane in the
vicinity dongle overloads and sound become very loud. Then i tested FAGC
and it fits well! 1024M/64 gives 16k and 256 samples equals - 62 ms of
signal. Works
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A shoot, I overlooked the 64 decimation rate... Sorry about that.
On 25.04.2014 17:36, Anton Komarov wrote:
Marcus, w/o AGC audio sometimes is creapy. I have tested AGC2,
tried to play with attack and decay, but at last when there is a
plane in
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