9 Jun
2018
9 Jun
'18
1:47 a.m.
Hello,
I have a question about osmo-fl2k,
the generated binary file using the fl2k grc transmission flow graphs, contains the
carrier frequency,
the fl2k_file stream the file to the device, so how the device can transmit these data in
that frequency.
I mean how it recognize the frequency to transmit on.
Thank you.
9 Jun
9 Jun
1:05 p.m.
These files just contain raw samples.
The fact that the signal then isn't around 0 Hz is simply because it
1. (optionally/depends on example you're referring to) was mixed, in
the generating GNU Radio script, onto a carrier frequency within the
first Nyquist zone and
2. on the fact that DACs introduce *images* in spectrum at multiples of
the sampling rate, and you exploit these to have a copy of your signal,
shifted by a multiple of the sampling rate. You should filter out all
the other copies.
Terms to google for: reconstruction filter, band-pass undersampling
Best regards,
Marcus
On Sat, 2018-06-09 at 00:47 +0100, Fred Neich wrote:
Hello,
I have a question about osmo-fl2k,
the generated binary file using the fl2k grc transmission flow
graphs, contains the carrier frequency,
the fl2k_file stream the file to the device, so how the device can
transmit these data in that frequency.
I mean how it recognize the frequency to transmit on.
Thank you.
2155
days inactive
2156
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2 participants
participants (2)
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Fred Neich -
Marcus Müller