[forgot to reply-all. Argh] On Monday 06 June 2005 14:14, Marcus Leech wrote: > What's the bandwidth of the 10.7Mhz output of the R8500?
It's designed for video capability; our technical director, Charles Osborne (K4CSO, President of the Society of Amateur Radio Astronomers (SARA)) tells me it's not real flat, but is probably about 3-4 MHz wide. > Was this a drift-scan, or were you tracking? Drift, for testing. The 26m's are outfitted with a DFM Engineering variable frequency AC motor drive, and will track at sidereal rates. But rather than power up the two 15 horsepower motors, I just left it at zenith. > Fellow radio astronomers want to know :-) Understood. > I have an USRP on the way from Matt along, with a pre-release DBSRX. It > will be interesting > to compare my spectral observations with yours, in the fullness of time. I have a TVRX (and a basic RX/TX pair) on my personal unit; the PARI unit is outfitted with two basic RX and two basic TX. The TVRX can do 70MHz direct; I might try that at some point. There's a significant electrical storm here now, so I have everything disconnected.... :-) As to the DBSRX, I mentioned to Charles Matt's statement of the 'less than 8dB noise figure' and Charles wasn't real impressed; need pretty good amplification ahead of it to get a useful noise temp. We have a few front ends with less than 3 dB NF here, and we will soon have better. No cryo here, yet. -- Lamar Owen Director of Information Technology Pisgah Astronomical Research Institute 1 PARI Drive Rosman, NC 28772 (828)862-5554 www.pari.edu _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
