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releasing new daily build of firmware version 2.12.2
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@df8oe
df8oe committed Nov 6, 2021
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2 changes: 1 addition & 1 deletion mchf-eclipse/src/uhsdr_version.h
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#define UHSDR_VER_MAJOR "2"
#define UHSDR_VER_MINOR "12"
#define UHSDR_VER_RELEASE "1"
#define UHSDR_VER_RELEASE "2"

#define UHSDR_BOOT_VERS "5.0.4"

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8 comments on commit dcbebe5

@Radiohr
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@Radiohr Radiohr commented on dcbebe5 May 7, 2023

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Does any version support si5351 on mchf

@df8oe
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@df8oe df8oe commented on dcbebe5 May 7, 2023

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I have experimented with SI5351 for some time years ago. Firmware does support SI5351 - but there are some "hardware specials" which must be in focus:

  1. SI5351 is used as "quadrature output". You have to modify the hardware to use the two quadrature outputs directly - no division after SI5351 neccessary! Please look at the code which outputs we used - I cannot remember. It is too long ago.
  2. quadrature output does not work on the complete working frequencies. As I remebger starting with 80m and below that again you need divider to get quadrature signals. So there must be hardware which is capable to select the correct signal switching.

I have stopped working on mixing concept of mcHF years ago as I noticed that getting advantages in signal specs is bundled with an enourmous hardware (and firmware) work, so I switched to DUC/DDC concept which is WIP (but at the moment stopped because of semiconductor availability).

@Radiohr
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@Radiohr Radiohr commented on dcbebe5 May 7, 2023

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I was trying to get medium wave on mchf..inducted si5351 4x output at input of 74hc74...it's producing quad signal at output. But as i change the si5351 frequency the waterfall doesn't move..if i dial 819 kz which is strongest statin here, si570 is still there but i removed it's connection to 74hc74 and inserted there 4x signal from si5351, rf i got prom loop antenna tuned to 819 but no station appearing...after 74hc74 m getting 819 kz quad signal. Is it due to rf filters which are stopping rf to move to mixer.. in mchf software i see si5152a written in some menu...if i cut si570 altogether and put si5351 will it auto detect si5351 and will work as usual ?

@df8oe
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@df8oe df8oe commented on dcbebe5 May 7, 2023 •
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SI5351 is auto detected. But again: The use of SI5351 needs big hardware modification - no "drop in" possible! Above a magic frequency (as I remember it is ~4MHz) you must use two osc outputs of SI5351 directly connected to the mixer LO inputs. NO 74x74 between! Below the magic frequency you MUST fed the signal via 74x74 to LO mixer inputs. The reason is that SI5351 cannot produce 90° signals in the whole working space. It works for all frequencies above a "magic frequency" - up to 200MHz. And below this frequency you must divide by 4. It is very long ago so I am not 100% sure: SI5351 has three outputs. One (the first??) has a signal when working frequency is below magic frequency. If there is a signal you must divide this by 4 and fed 0/90 to mixers. If this output does not have signal you must switch the remainig two outputs to mixers directly (without dividing by 4) because of these two outputs already have 0/90° signal. NO DROP IN POSSIBLE.

EDIT:
SI5351 was implemented to get higher working frequencies (2m...) - NOT as a 1:1 replacement for SI570. I know there are clones which use the SI5351 with a divider behind at whole working space - but this is modified firmware. UHSDR does not support the "drop in mode" for SI5351.

@Radiohr
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@Radiohr Radiohr commented on dcbebe5 May 7, 2023

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Thank you very much for you time and so prompt response.. what if i put another 74x74 and can work si570 down to 500khz...will it be easy to modify the firmware to display the correct frequency ( now it's si570 output divided by 16). I tried rf upconverison of 2 MHz but it was not very clear.

@df8oe
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@df8oe df8oe commented on dcbebe5 May 7, 2023

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Sorry - I cannot give you any further hints or information. I have left mixing concept about 7 years ago, since then I am working on direct sampling concepts where no oscillators are needed. Firmware is Open Source and we have commented the blocks we have modified so that you can dig into the code and understand / modify what you need.

@Radiohr
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@Radiohr Radiohr commented on dcbebe5 May 7, 2023

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Ok I understand. UHSDR had it's youth and old age under you. It's time to move on and we the followers always wait for the next magic you brings in..

@df8oe
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@df8oe df8oe commented on dcbebe5 May 7, 2023

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I hope semiconductor crisis will left us this year AND I hope there will join contributors who have big experiences in Quartus FPGA developing. I have joined this 2018 and was interrupted by Corony crisis and other stuff so it would be helpful if it will change in future...

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