UHF monitoring

GNU Radio
1

Hi,

I need to monitor usage of UHF bands (400-800MHz). I was wondering if
this
is possible to do using the gnuradio. For this, I was planning to do the
following steps:

  1. Buy an omni-directional discone antenna
  2. Hook it up with gnuradio daughterboard (TVRX)

I want to monitor channels with bandwidth 6Mhz. In particular, I want to
see
time-variant usage of channels in 400-800Mhz range. I do not really want
to
decipher down the signals. Can you please check if my method is correct
or
not.

Thanks everybody.
George

View this message in context:
http://old.nabble.com/UHF-monitoring-tp28209296p28209296.html
Sent from the GnuRadio mailing list archive at Nabble.com.

2

On Sun, Apr 11, 2010 at 08:01, schuler101 [email protected] wrote:

I want to monitor channels with bandwidth 6Mhz. In particular, I want to see
time-variant usage of channels in 400-800Mhz range. I do not really want to
decipher down the signals. Can you please check if my method is correct or
not.

Yes. The USRP1 or USRP2 and TVRX daughterboard will allow you to do
exactly this. You will need to write a GNU Radio application to
analyze the incoming samples and display the information you are
interested in, unless the existing spectrum or oscilloscope utilities
will give you what you want.

Johnathan

3

Thanks for reply. I had one more question, if I was just monitoring the
usage
of channel (it is being used or not at any moment), do I still need to
write
complex gnuradio scripts? My guess would be that it should be easy to
write
corresponding scripts since I am not trying to decipher received signal
as
such. Are such scripts already available in open-source? Thanks a lot
and my
apologies for not being very radio-literate :frowning:

George

Johnathan C.-2 wrote:

Discuss-gnuradio mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

–
View this message in context:
http://old.nabble.com/UHF-monitoring-tp28209296p28219151.html
Sent from the GnuRadio mailing list archive at Nabble.com.

4

On Mon, Apr 12, 2010 at 09:05, schuler101 [email protected] wrote:

Thanks for reply. I had one more question, if I was just monitoring the usage
of channel (it is being used or not at any moment), do I still need to write
complex gnuradio scripts? My guess would be that it should be easy to write
corresponding scripts since I am not trying to decipher received signal as
such.

You have two choices:

  1. Use an existing utility like usrp_fft.py to visualize the sample
    stream coming from the USRP in the time or frequency domains.

  2. Write your own GNU Radio application to process the sample stream
    to extract the information you desire.

It all depends upon what you mean by “just monitoring the usage of
channel”.

Johnathan

5

you don’t have to write a complex script. use the usrp_fft as your
starting
point. understand it and edit where needed. you don’t even have to write
a
new processing block =) good luck.

schuler101 wrote:

decipher down the signals. Can you please check if my method is correct

Discuss-gnuradio mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

–
View this message in context:
http://old.nabble.com/UHF-monitoring-tp28209296p28219210.html
Sent from the GnuRadio mailing list archive at Nabble.com.