Re: [Discuss-gnuradio] using gnuradio as a amateur radio
On Wed, Jun 18, 2008 at 12:24:46AM -0700, [EMAIL PROTECTED] wrote: > It's a 50 Ohm single-ended input. You could interface with a common > ameatur 2m amp as long as the input is 50 Ohm. Most amps include a > strict band filter. > > Jonathan FYI, when using the Basic Tx to transmit in the 2m band (144MHz), we're running in the second nyquist zone. Unless you use a serious amount of filtering, the vast majority of the power emitted is "out of band". Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] using gnuradio as a amateur radio
Hi Eric > On Mon, Jun 16, 2008 at 05:48:05PM -0300, rafael2k wrote: >> Hi all, >> I'm using gnuradio to receive and transmit to 2 meters amateur radio, >> and when >> I went to buy the cable, I didn't know what impedance should I use w/ >> the >> usrp. 50 ohm or 75 ohm? >> >> Can I connect an amplifier to the basic-tx without any problem? >> >> thanks >> rafael diniz > > Please explain to me how you are planning on transmitting on 2 meters > using the basic tx daughterboard and how you are planning on > controlling out of band emissions. By 2 meters (the wave length) radio I mean the range of 144-148 Mhz (here in brazil, is the band for amateur radio class C) - I can receive and transmit using the examples that come w/ gnuradio (fm_tx4.py and usrp_nbfm_rcv.py). I already bought an small antena (1/4 of wave length - its working), but I'd like to put an antenna in the top of my home (to receive, w/ basic-rx), so I'd like to know what impedance (for the cable) should I use. Another issue is that in the future I would like to put an amplifier in the output of the basic-tx to reach farther places. Is it simple as I think it is? USRP is really a great piece of hardware!! I did not thought about the out of band emissions yet... may be I could add some filters too... Thanks, Rafael Diniz ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] using gnuradio as a amateur radio
On Mon, Jun 16, 2008 at 05:48:05PM -0300, rafael2k wrote: > Hi all, > I'm using gnuradio to receive and transmit to 2 meters amateur radio, and > when > I went to buy the cable, I didn't know what impedance should I use w/ the > usrp. 50 ohm or 75 ohm? > > Can I connect an amplifier to the basic-tx without any problem? > > thanks > rafael diniz Please explain to me how you are planning on transmitting on 2 meters using the basic tx daughterboard and how you are planning on controlling out of band emissions. Thanks, Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] using gnuradio as a amateur radio
Hi all, I'm using gnuradio to receive and transmit to 2 meters amateur radio, and when I went to buy the cable, I didn't know what impedance should I use w/ the usrp. 50 ohm or 75 ohm? Can I connect an amplifier to the basic-tx without any problem? thanks rafael diniz -- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- Ciência da Computação @ Unicamp Rádio Muda, radiolivre.org, TV Piolho, tvlivre.org, www.midiaindependente.org Chave PGP: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x2FF86098 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- signature.asc Description: This is a digitally signed message part. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
