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Diskussions- und Newsboard des DARC-Ortsverbandes I40  |  allgemeine Kategorie  |  UHSDR Firmware (Moderators: DF8OE, DL1PQ)  |  Topic: STM32H7 series revision: Beware of the changes! <- zurück vorwärts ->
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SP3OSJ
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Re:STM32H7 series revision: Beware of the changes!
« Reply #30 on: 13. September 2019, 17:39:23 »

Yes
I wanted to show how much power is in this small processor when the program is optimized well.
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DF8OE
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Re:STM32H7 series revision: Beware of the changes!
« Reply #31 on: 13. September 2019, 18:57:17 »

Where is the anti aliasing filter which is included in WM? I am sure it works - but I am sure it cannot perform (signal quality) like F7/H7 with better filter coefficients (more taps). I think it is designed for "very inexpensive production" with "impressive optics". But if you compare rf signal quality with mcHF design I think mcHF design will win.

EDIT:
And - of course - it is NOT DUC/DDC. It is "mixing concept". A/D converter of STM has a maximum sample rate of ~1.5MHz (I am not sure and do not want to dig into the datasheet now but I remember it was below 2.5MHz)

vy 73
Andreas
« Last Edit: 13. September 2019, 18:59:57 by DF8OE » Logged

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SP9BSL
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Re:STM32H7 series revision: Beware of the changes!
« Reply #32 on: 13. September 2019, 20:30:22 »

Quote from: SP3OSJ on 13. September 2019, 17:39:23
Yes
I wanted to show how much power is in this small processor when the program is optimized well.

with this statement you suggest the we should step back and stay with F4? Or the UHSDR is not properly optimized? Believe me or not it is at the best level we can... Anyway, it's your choice to use the UHSDR or not. Beside the intention of suggestion is positive or not, DDC/DUC is a concept where is NO local oscillator!

@Andreas: 2MSPS for one ADC, ~4MSPS for two and 6MSPS for 3 in interleaved mode. But all then stucks at the 12 bit resolution and ADC dynamic... I've tried high bin count FFT (large processing gain) and the high input noise causes that the MDS is at the level of ~-70dBFS.
« Last Edit: 13. September 2019, 21:18:34 by SP9BSL » Logged

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Diskussions- und Newsboard des DARC-Ortsverbandes I40  |  allgemeine Kategorie  |  UHSDR Firmware (Moderators: DF8OE, DL1PQ)  |  Topic: STM32H7 series revision: Beware of the changes! <- zurück vorwärts ->
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