HackRF?

[Marcus D. Leech]

Has anyone on this list had any extensive experience with the HackRF One
for radio astronomy at 21cm?

I'm doing some budgeting for upcoming projects, and there are
availability issues on "other choices" in this space, so, looking at
  alternatives...

[Raydel Abreu (CM2ESP)]

Not specifically for radioastronomy but I have used it for satellite work at L-Band.

In general I can say it has relatively low sensitivity at L-Band, although it has selectable bandwidth filters very useful for nearby not so strong interfering signals.

I did some attempts also for decametric observations in HF and depending of the antenna and frequency band it was easily overloaded due to the limited dynamic range and once signal gets clipped get ready to all sort of weird things and birdies.

But excluding that minor issues I must say I was satisfied with mine.

Unfortunately two days ago I accidentally injected 12V to the antenna port due to reversed bias tee and now its damaged, I removed a burn MOSFET and apparently it works in RX and TX but just for a couple of minutes because its internal 3.3V and 1.8V PSU gets very hot. So no more HackRF for me... very sad now 😕😔 Although I am hoping I can have it fixed as long as it is only the PSU, fingers cross...

Regards

Raydel, CM2ESP

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[fasleitung3]

Hi Marcus,
We have used the HackRF quite a bit for spectral observations until
some day it died for unknown reasons. We could not identify any mistake
from our side.
We measured some characteristics, please have a look at
https://astropeiler.de/sites/default/files/Hydrogen_3.pdf
You will also find results from a clone of the HackRF as well as from
other SDRs. For some time the ADALM Pluto was our favorite due to its
gain stability. We could live with the ripple on the passband for our
purposes, however it is a nuisance for wide spectra like spectra from
other galaxies. The ADALM Pluto, however, is useless for pulsar
observations as it starts to lose samples at fairly low sample rates.
Since the article was written, we have also used a Lime SDR, a RSP2pro
and most recently an Airspy. A new, detailed test of all these SDRs has
still to be done.
In conclusion, all of these SDRs will work for Hydrogen observations.
If only galactic Hydrogen lines are the subject of interest, then IMHO
the ADALM Pluto is the best due to its gain stability. When other
things are on your agenda, then the devil is in the detail.
Cheers,
Wolfgang

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