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NFM de-emphasis #4

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esplien opened this issue Jul 5, 2021 · 8 comments
Closed

NFM de-emphasis #4

esplien opened this issue Jul 5, 2021 · 8 comments
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enhancement New feature or request

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@esplien
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esplien commented Jul 5, 2021

As most amateur VHF/UHF FM transceivers uses a pre-emphasis with 750us characteristic, it is of interest to be able use the corresponding 750us de-emphasis in Qirx NFM to achieve a "flat" response of tx/rx and better S/N-ratio. Selectable of course.

@softsyst softsyst added the enhancement New feature or request label Jul 5, 2021
@softsyst softsyst mentioned this issue Jul 6, 2021
@softsyst
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softsyst commented Jul 8, 2021

Espen,

I made a test implementation of the de-emphasis, in the NFM demodulator. I'll send you a PM.

73,
Clem

@esplien
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esplien commented Jul 8, 2021 via email

@softsyst
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softsyst commented Jul 8, 2021

Espen,

Problem #1 is normal behaviour, because this one has the same version as the already installed one. This will not change, because I'll not give such interim builds a new version.

Obviously, I had made a debug build necessitating the dll's you mentioned. Maybe you can download them from somewhere. I'll make a release build for you in any case, not sure if I manage today.

73,
Clem

@esplien
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esplien commented Jul 8, 2021 via email

@softsyst
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softsyst commented Jul 8, 2021

I'll probably not be able to rebuild the rtl_tcp tomorrow, due to other project obligations. You could take it from an older release and copy it into your current install directory, and test the de-emphasis.

I'll get back to you if I found the time to do it.

73,
Clem

@esplien
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esplien commented Jul 9, 2021 via email

@esplien
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esplien commented Jul 9, 2021 via email

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V 3.1.5 implements the NFM deemphasis.

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