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Author: Subject: do-it-yourself nuclear magnetic resonance spectroscopy
Rainwater
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[*] posted on 25-1-2023 at 01:37


True.

Rf switches have come a long way.
SKY12212-478LF for example
$10usd
100w power
.6db tx/rx loss
46db rx/tx isolation

Would be better than tuning for each frequency.
But present its own problems.
Limited stopping power.
Can be in series with each other if isolation is not enough.

Signal generation will no longer be a problem with many ic operating over 100mhz clocks
You can generate a 80mhz signal with an esp32 and control it with nanosecond timing,

Recreating oscilloscopes level resolution and memory depth still remain a challenge but the ic chips are here now if not expensive
I/q modulation might be well suited and has come along way as well




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Rainwater
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[*] posted on 28-1-2023 at 16:28
I love living in the future


Read this thread 3 times and there seems to be a big controversy on
Well. Every aspect of a design and what is required.

I would like to try to nail down exactly what we need to make the hardware do

Will the following parameters provide a sufficient starting point for.

Receiving and recording the signals generated
Generating the transmission signal. (Not powering it)

0.2 seconds of recording.
200msps data capture at 12bit (4096 increments)
Good for detailed analysis less than 50mhz
Poor spectrum analysis at 100mhz

An 860mhz 50% duty cycle PWM generator or
360Mhz iq modulator, basically generates any waveform you can dream up.
Higher frequency, less control

All with already written and vested software from the open-source community
DAC, Modulators, ADC readers. It's all been written and licensed under open source
It just has to be cut and pasted together

a setup with a custom board a
Adc - TI ADS4128 200msps (Link)
And a nano 9k FPGA (Link)
can do all this. And it's cheap like $50usd


[Edited on 29-1-2023 by Rainwater]




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19-11-2023 at 09:51
Rainwater
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[*] posted on 31-5-2024 at 19:15


15 months ago, i started down this road. By far the most difficult part is the digital RF receiver. Been having so much trouble figuring this out im taking my bsee and getting it upgraded to a MSEE in rtl design and digital signal processing. It will defendanty be cheaper to buy one, but there is no fun in that!



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