Also, if you have gnuplot installed you can redirect the output of run_hackrf
to a file and plot it using the attached perl script.
Thanks,
--Patrick
From: [email protected]
To: [email protected]; [email protected]
Subject: RE: [Hackrf-dev] Retune time for the hackRF One
Date: Wed, 27 Apr 2016 17:59:03 -0700
Hi Mike,
I have attached the tar/zipped file of my scanner source. It includes a
Makefile to build it and a shell script 'run_hackrf' that runs it how I usually
do.
To explain the design a bit: There is a SignalSource class of which
HackRFSource is a subclass. This class has the rx_callback method invoked by
your library. It also has ThreadWorker method running on a separate thread
which together with the callback implements a state machine with 3 states:
Streaming, DoRetune, Done. The rx_callback queues the received samples if the
state is Streaming and then it switches state to DoRetune. The ThreadWorker on
state DoRetune does the retune, sets a counter to the number of packets to
drop, and changes the state to Streaming. The rx_callback decrements the
counter when the state is Streaming until it hits 0 and then enqueues the
samples and repeat. It is the discard counter (m_dropPacketCount) that I had to
increase from 1 until I hit the value where the spectrum looks OK. The state
variable is implemented using std::atomic.
Even if you are not able to build/run it could you please take a look at the
initialization, callback, and ThreadWorker methods to see if it is OK.
Thanks much for the help,
--Patrick
> Date: Tue, 26 Apr 2016 19:15:29 -0600
> From: [email protected]
> To: [email protected]
> CC: [email protected]
> Subject: Re: [Hackrf-dev] Retune time for the hackRF One
>
> On Tue, Apr 26, 2016 at 05:46:01PM -0700, Patrick Sathyanathan wrote:
> >
> > BTW, the ANT500 I received from NooElec does not have the rotating
> > collar I expected from the description.
>
> It can be a bit stiff, especially at first. That is a good thing. It
> means it won't start falling over after you use it for a while.
>
> Try this: Fully collapse the telescopic section. Set the elbow so it is
> at a right angle. Then use one finger near the end of the antenna (so
> you have some leverage) to rotate the antenna clockwise.
>
> Mike
use File::Temp;
sub get_temp_filename {
my $fh = File::Temp->new(
TEMPLATE => 'tempXXXXX',
DIR => '.',
SUFFIX => '.dat',
);
return $fh->filename;
}
my $filename = get_temp_filename();
open my $fh, ">", $filename
or die "could not open $filename: $!";
my $line = "";
while ($line = <>) {
if ($line =~ /freq ([0-9]+) power\_db ([0-9]+\.[0-9]+)/) {
print $fh "$1 $2\n";
}
if ($line =~ /Start scan/) {
# print $fh "replot\n";
}
}
exec("gnuplot -p -e \"plot \'$filename\' using 1:2;\"");
close $fh;
unlink $filename;
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