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Topic: poor sideband suppression (Read 3690 times)
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S53DZ
schon länger dabei
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Posts: 58
Ich liebe dieses Forum!
  
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Re:poor sideband suppression
« Reply #16 on: 08. September 2018, 09:53:56 »
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Andreas,
Just for brainstorming:
What was behind my unhappiness with your balancing the audio level to RF level, was the thought that by suppressing the "artificial birdy" in audio signal, we know (should know) the precise position on the audio frequency scale --> hence, we can use this information to calculate-back the precise position of this suppressed signal on the RF scale (IQ signal) and "repair" the data there to reflect the down the stream Hilbert audio compression. This way the spectrum could be cleared also, ... So, no big block calculation needed, but I suppose I am wrong here and such calculation is not easy or even not possible.
I said it complicated, I hope the idea can still be seen, hi. 
73 Bojan
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DD4WH
positron
alter Hase
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Re:poor sideband suppression
« Reply #17 on: 08. September 2018, 11:03:03 »
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Hi Bojan,
thanks for your brainstorming!
At the moment I am a little confused about "signals that can be seen, but not heard".
Could you explain in which circumstances you can see signals that you cannot hear? I am confused about that, because I do not encounter that on my machine.
73 Frank
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-----------------------------------------
Teensy Convolution SDR
https://github.com/DD4WH/Teensy-ConvolutionSDR
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S53DZ
schon länger dabei
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Re:poor sideband suppression
« Reply #19 on: 08. September 2018, 12:46:35 »
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Hi both,
no, please check the two pictures of the UI scope display showing the two signals. It is not in the level of the nearby signal. It is the signal displayed inside the RX window. The very same two that exhibit -50 dBc.
The input signal is 10.100 MHz at -53 dBm.
73 Bojan
PS: LCD is still covered with plastic foil so the picture quality is not good.
EDIT:
ok, only one picture at a time!?
EDIT2:
This signal is "you can see, but you can not hear"!
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 10M1-LSB.jpg
« Last Edit: 08. September 2018, 12:58:39 by S53DZ » |
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S53DZ
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Re:poor sideband suppression
« Reply #21 on: 08. September 2018, 13:35:16 »
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Hm, Andreas,
I think it is the same kind of signal (the same level, same bahavior) as you can see in Zoom = 1, but this time 2 x 12 kHz across. Guessing.
73 Bojan
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Most of my commercial rigs are not satisfying in this point, too. Levels of weak signals are torn down when a very big signal is close to the wanted signal...
