[Hackrf-dev] Transmitting test signals

[Chuck McManis]

Hi Doug,

The simplest way to do this is to generate an IQ data file with your C code
and then set up a GRC flowgraph which uses that file as a source and the
HackRF as a sink.

If you look at the web site where Mike talks about recording a signal and
then playing it back, it has all the elements (except you're generating the
signal not recording it)

As for the receiver side being 8 bits only, that is ~ 48dB of SNR. That is
fine for many many receivers. I'd say don't knock it until you try it :-).

--Chuck


On Fri, Oct 30, 2020 at 5:57 AM McDonald, J Douglas <jdmcdona at illinois.edu>
wrote:

>
> Right at the first I bought a HackRF. It sort of worked.
>
> But I never succeeded in getting it to, usefully, do what I bought it for,
> transmitting test signals of my own design.
>
> What I want to do is trivial: generate an array in memory using a
> straightforward C (hopefully NOT the cumbersome C++) program, then either
> repeatedly and seamlessly send it to the
> HackRF. Seamlessly means that to runs over and over forever, the end
> connecting seamlessly
> to the start of the file. I would like to get at least 8 MHz of unaliased
> spectrum, though 10 would be better.
>
> I never got it to work seamlessly.
>
> This would NOT use any oddball stuff like Python or Linux, just plain
> ordinary C on a plain ordinary Windows 10 PC.  I tried on Linux with the
> sort of "system" that uses Python and its hoplelessly klunky. Especially
> since there is no documentation.
> If I am forced to communicate with a "driver" I need good documentation,
> otherwise, its magic which I don't seem adept at.
>
> It tried lots of things including a Windows device driver I found, but
> while it sort of worked,
> for a while, it always started stuttering.  I can get receive to work in
> the same bandwidth
> no problem. But I never expected the HackRF to work as a receiver with
> only
> 8 bits ... not enough dynamic range. 8 bits is of course perfectly fine
> for test signals.
>
> Its been a while since I sent a message like this. Advice is needed in
> email, at least how to
> contact this help group and its archives if there are answers already.
>
> Doug McDonald
> jdmcdona at illinois.edu
> _______________________________________________
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> HackRF-dev at greatscottgadgets.com
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>
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