Yes, a cable would be nice and easy, but I'm also planning for a "demo", and the cable would spoil the effect :-). Additionally, I'm looking for multiplexing (multiple parallel transmissions) and there the cable doesn't help.
Thanks, Mihai On Thu, 12 Jun 2008, Martin Dvh wrote: > Mihail L. Sichitiu wrote: > > Hi there, > > > > I'm brand new at this GNU Radio thing, so please forgive me if my question > > has a "well-known" answer. I'd like to try out some performance tests on a > > few modulation schemes, so I need a clean band for these tests. Obviously > > the 2.4GHz ISM band is full of interference, and I assume that this goes > > for all the other ISM bands, right? > > > > If this is the case, is there a well-known relatively quiet band where I > > can run these tests without interfering with anything important, without > > being interfered with, and without getting in trouble with FCC? > The easiest thing to do would be not doing your tests wireless. > Connect TX twith coax to an attenuator and connect that to the RX side with > coax. > That is about as clean as you can get, and you won't interfere with anyone on > any band. > > Make sure you use enough attenuation. The RFX2400 TX side has much more power > at its output then the RX side can handle. > You will blow up your daughterboards if you don't have at least 30 dB > attenuation. > > The best attenuators I found for high frequencies are the SMA inline types > You can mount them directly at the TX output and connect a SMA-SMA coax to > the RX side of a second RFX2400. > > Things are much more relaxed with basicRX and basicTX. > basicRX can be connected directly to basicTX without any chance of damage. > > I do a lot of my testing with basicRX and basicTX. > The output of basicTX is also very low which is an advantage in this case. > > Greetings, > Martin > > > > > > I imagine that if I'd have all the daughter boards I could do a long-term > > (1-2 days) scan and find a quiet band and play in there (the tests are > > likely short and low powered). The problem is that I only have the 2.4GHz > > daughter-boards and I'd like to buy only the "right" daughter-boards (as > > opposed to all of them to find an empty band). > > > > Thanks for the help, > > Mihai > > > > > > > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > [email protected] > > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > -- Whatever you are, be a good one. Abraham Lincoln _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
