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Re: [Discuss-gnuradio] Re: Noise while executing USRP examples

From: Iban Cardona
Subject: Re: [Discuss-gnuradio] Re: Noise while executing USRP examples
Date: Wed, 10 Aug 2005 10:35:58 +0200

You are using a wi-fi antenna (2.4 / 5.8ghz) for 29mhz band? If it is true, use a ghz antenna on the mhz range as the same as nothing, because the wavelength of 2.4ghz are 13cm and the wavelenght of 29 are 10meters, and if the dipole have some harpin, gamma math or some impedance adaptor, on 29mhz as the same as to do a shortcircuit, and you can damage the board.
----- Original Message -----
Sent: Wednesday, August 10, 2005 9:06 AM
Subject: Re: [Discuss-gnuradio] Re: Noise while executing USRP examples

Hii Eric,

1)As suggested by Matt ,we have purchased the Antenna’s (Specifications again for reference).

2) Now Can we change the frequency range for the below specified examples fsk_tx.py , fsk_rx.py and  nbfm_ptt_quick_and_dirty.py other than 29Mhz ?

3) Since we have already purchased the antenna's , is there any way that, with minimal modifications we can use the same Antenna’s?

Please provide some solution on the same.

Antenna specifications:                                     

1. Electrical Characteristics:

    Operating Frequency 2.4~2.5 & 4.9 & 5.15~5.35 & 5.725~5.85 GHz
    Antenna Type: Dipole
    Polarization Type :  Linear
    Type of Radiation:  Toroidal
    Peak Gain 2.0 dBi Typical For 2 G 4.0 dBi Typical For 5 G
    Impedance:  50 Ohm nominal                                  V.S.W.R. 2.0:1 Max.

2. Mechanical Characteristics

    Swivel :  90 degrees
    Connector:  SMA(M)
    Core:  N/A

On Wed, 10 Aug 2005 Eric Blossom wrote :
>On Wed, Aug 10, 2005 at 10:34:32AM +0530, Arora_Amit wrote:
> >
> >      1)      We are running the USRP examples on USRP board fsk_tx.py
> > and fsk_rx.py on one PC. During execution we are receiving too much of
> > noise, what might be the reason?.any solution?
> >
> >      2)      Can we run both fsk_tx.py and fsk_rx.py simultaneously
> > on the same PC or do we need to run them on two different PC's ?
> >
> >      3)      While running nbfm_ptt_quick_and_dirty.py  we are
> > receiving lot of noise. Please provide some solution?
>Matt and I will be sorting out the Tx/Rx example sometime before we
>release 2.6.
> >      4)      As suggested in the USRP document, we are using the
> > antenna with following specifications:
>An antenna tuned for 5 GHz is not going to work well for Tx and Rx
>taking place at 29 MHz...
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