My concern would be pushing any cable reflection contamination to modes in the window. Currently only a small subset of MWA antennas have 150 meter cables, but the reflection line shows up very clearly. 45 meters puts the delay right at 0.2 h/Mpc, which is where we do a lot of our sensitivity forecasts. I doubt moving to 0.3 would change sensitivity much, but just food for thought.
-Adam On Tue, Apr 12, 2016 at 1:26 PM danny jacobs <[email protected]> wrote: > The 35m length has been worrying me a little lately. Would there be any > downsides like having a different spectral response for the longer cables? > > ~D > > On Tue, Apr 12, 2016 at 1:24 PM, DAVID DEBOER <[email protected]> > wrote: > >> Hi - I was thinking about the analog cable lengths a bit. We have a spec >> at 35 m (30m+the vertical part to the feed). This puts the delay at about >> 0.15h/Mpc. Would it be advantageous to have, say, most of the cable >> lengths at 25m and a smaller subset at 45m? >> >> Dave >> > > > > -- > ================================================================ > Daniel C. Jacobs > KE7DHQ > National Science Foundation Fellow > Arizona State University > School of Earth and Space Exploration > Low Frequency Cosmology > Phone: (505) 500 4521 > Homepage: http://loco.lab.asu.edu/danny_jacobs/ > MWA: mwatelescope.org > HERA: reionization.org > PAPER: eor.berkeley.edu >
