Re: [Discuss-gnuradio] HELP: USRP1+WBXv3 "Overflow"

[Marcus Müller]

Hello SKA15,

well, I'm pretty sure there is some way to do this in GRC; but honestly, this sounds like something that would be very little lines of code in python; I recommend going through the guided tutorials [1] in order to understand how to write a python block that will emit the right stream tags at the right time.

Greetings,
Marcus

[1] http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials

On 12/23/2014 04:40 AM, Thesis 2015 wrote:

Good Day,

We are able to receive FM signals using the USRP1 with WBXv3 50-2200 having a 750cm solid wire that serves as an antenna. We were wondering how to modify the generated GRC python code. We are planning on changing the center frequency automatically with an interval of 200MHz in a specified time. Thank you.

-SKA15-

On Thu, Dec 18, 2014 at 12:19 AM, Gerry Creager - NOAA Affiliate <address@hidden> wrote:

Considering the saturation level of most commercial FM stations, using a simple whip antenna will prove more than adequate. While a wide-range log-periodic antenna might prove useful as you get farther into your research, especially for broadband signals requiring a directional antenna, using simpler tools while learning is usually beneficial.

gerry

On Wed, Dec 17, 2014 at 4:06 AM, Marcus Müller <address@hidden> wrote:

I'm afraid you did not make a mistake -- the LP0410 [1] is specified for usage between 400 and 1200 MHz. Whilst it will still pick up some signal at frequencies below 400MHz, operating it at a quarter of the lower cutoff freq. will lead to very suboptimal results.

If you know your frequency range as well as you do, I recommend trying Ralph's proposed 1/2 wavelength monopole antenna.

Greetings,
Marcus

[1]http://www.ettus.com/product/details/LP0410

On 12/17/2014 09:43 AM, Thesis 2015 wrote:

We're sorry. We made a mistake with the frequency range that the antenna could receive. It is actually 40MHz - 1.2GHz.

-SKA15-

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That feed on their velocity; 

And little whorls have lesser whorls, 

And so on to viscosity.” 

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