Am 10.03.19 um 15:54 schrieb jimlux:
True.. but there are a plethora of the USB 5V power blocks around - in
general, there are lots of USB 5V (noisy, I'm sure), e.g. Cars now
have 5V USB jacks, so I was thinking about designing with that in mind.
The question is really more one of "how much filtering do I need to
design into the downstream power supply circuits"
It should not be too hard since there are no ground loops involved.
<
https://www.flickr.com/photos/137684711@N07/39972841815/in/album-72157662535945536/
>
The squares on the paper are 5mm.
Noise density is better than 1nV / rtHz above 100 Hz. You definitely
need a fuse. Ishort is >> 30A.
BTW, the next picture to the left is the noise of 2 cells = 8Vdc.
14 dB below 1 nV. The steep rise below 30Hz is the too small coupling
capacitor.
for all practical purposes any legitimate 18650 sized Li-ion cell is
around 3.5 Ah.
yes. the really good ones.
(who thinks about using a dozen of these for portable EME tests on
432 :-) )
You're going to run your kilowatt amp off 36 cells in series? Why not..
No, 100W from a GaN FET at 48V and <= 10 element antenna is more than
enough.
The rest is mostly a Dell XPS13 notebook and a Red Pitaya + up/down
converter. Lunchbox size.
< https://www.redpitaya.com/ >
It is easy when your partner station looks like this:
< http://dl7apv.darc.de/Neue%20Antennen/Neue%20Antennen.htm >
To be more on-topic, two Red Pitayas can be synced and should easily
provide the hardware for a Timepod work-alike. That would be 4 125 MSPS
14 Bit ADC channels,
two FPGAs and ARMs with Linux and web server.
(and with dual use as VNA, Bode plotter, signal generator...)
regards, Gerhard
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