Re: [Discuss-gnuradio] [USRP-users] best transmitter/receiver setup for large coverage

[dilip thapa]

Marcus,

As in a document the antennas are tri-band 144/430/1200MHz omni-directional.

Can you please explain in a little more detail, how can I check (scriptedly) with different frequencies, and find the best frequency, what will be criteria to determine the better frequency, is that can be distance only?

If we have open environment then can you provide any good reference.

~Dilip

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Date: Thu, 15 Aug 2013 14:44:42 +0200
From: address@hidden
To: address@hidden
Subject: Re: [USRP-users] best transmitter/receiver setup for large coverage

Find out what antennas are used; antennas work better for different frequencies.
However, to really find out what works best in your particular environment, the best (and fastest way) is most propably to (scriptedly) try out different frequencies.
Best SNR is, of course, achieved when you transmit with maximum transceiver and maximum receiver gain, note, however, that especially for the transmitting part, clipping of signal has been observed. So basically, try different frequencies with a medium gain, and when you find one or two good frequency ranges, try different gains.

Greetings,
Marcus


PS: I've taken discuss-gnuradio from the receiver list, as this is not a discussion that is very related to GNU Radio

Lin,

As I am aware, daughter-board used are https://www.ettus.com/product/details/WBX. and site is not updated.
And we can use WBX 50-2200. So If we replaced the daughterboard. how can I achieve the best SNR with above environment.

~Dilip

Date: Thu, 15 Aug 2013 20:21:16 +0800
Subject: Re: [USRP-users] best transmitter/receiver setup for large coverage
From: address@hidden
To: address@hidden
CC: address@hidden; address@hidden

Dilip,

So you just use CORNET remotely. Well, I think you should try different parameters... 

They use Custom developed USRP2 daughterboard based on the Motorola RFIC4. I didn't find "specifications on the "custom daughterboard"" in the FAQ.

Lin

2013/8/15 dilip thapa <address@hidden>

Lin,

actually it is under the building please check here CORNET.

~Dilip

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Date: Thu, 15 Aug 2013 19:49:38 +0800
Subject: Re: [USRP-users] best transmitter/receiver setup for large coverage
From: address@hidden
To: address@hidden
CC: address@hidden; address@hidden

1 km is a long distance, so the lower frequency, the less pathloss. Use maximum tx gain and rx gain. 

And the distance may highly depend on the environment. Is there buildings, trees, or just a blank space?

Lin

2013/8/15 dilip thapa <address@hidden>

Hi,
 
I am using usrp2 and gnuradio 3.3.0.
I want to use benchmark_tx.py as transmitter and benchmark_rx.py as receiver.
so that multiple receiver at distance of around 1 KM should get good signal strength.
 
So could you please let me know the best options for tx and rx waveform, so I could get the maximum range of coverage.
best options means:

transmitter frequency, tx gain, tx amplitude and rx-gain, if there is any other then let me know.
 
I need this to do spectrum sensing with energy detection.
 
with Thanks,
Dilip

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