Hi Kyeong,
First, sorry about the double transmission of my message. I did not
attach [discuss-gnuradio] to the first one and when I did not see it, I
figured it got lost and so resent with the correct subject line.
I have checked my board and it does seem to work down to 90 MHz. I need
to run more detailed tests with a signal generator to get exact
sensitivity numbers, but it should be good enough.
I tried making the changes to sample rate and other things that you
suggested, but it still does not demodulate FM broadcast signals. I have
to admit that the RTL-SDR devices never did a very good job, either, but
I attributed that to relatively poor sensitivity, although I have some
pretty good ones, as far as they go. I also tried to lower the gain, but
that did not seem to work, either.
If anyone has had success getting the Pluto to work with FM broadcast
signals, perhaps they could publish the grc file?
Regards,
Ed
On 12/15/2017 8:33 PM, Kyeong Su Shin wrote:
Dear Ed Troy:
I don't have the PlutoSDR with me right now, so I cannot test it now,
but a few things to check:
-Make sure that your Pluto can go down to 90MHz alright; it is only
rated to operate on 325MHz - 3.8GHz, and not guaranteed to behave well
on such frequencies (even when you did made the changes).
-Try lower sampling rate; like 2MS/s. PlutoSDR is known to drop
samples at relatively high sampling rates (and yes, I do mean that
5MS/s is too high).
-Try lowering gain; FM signals can easily overload the frontend of
such devices.
If I replace that PlutoSDR source block with an Osmocom source block,
change the carrier frequency to my local station, and attach a
different radio, it works. (Can't test on a PlutoSDR now, as I do not
have one with me now).
Regards,
Kyeong Su Shin
On Fri, Dec 15, 2017 at 4:12 PM, Ed Troy <et...@aeroconsult.com
<mailto:et...@aeroconsult.com>> wrote:
Hi,
I have been trying to get my Pluto to work with WBFM, but I am not
having any luck. I am attaching a grc file that I am pretty sure
should work, but it does not. It just generates sporadic noise. I
did the changes recommended to get the Pluto to work over a wider
frequency range, and the results indicated that the changes
worked. And, I have tried using the Pluto at higher frequencies to
detect a WBFM signal, and it still does not work properly. So, I
know it has to be something with my grc file.
What am I doing wrong?
Ed
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