So the two major changes introduced between 64 and 128 are: 1) some antenna numbers in the range 63-127 got rcvr-antenna cables which are not exactly 150m (500ns) 2) rcvr-adc cables were lengthened from ~3m (7ns) to 50m (60.5ns)
But we see a ripple of 150ns, right in between 121 and 181.5. What if we add on the distance from the container bulkhead to the adcs? How long are those cables? On Fri, Feb 6, 2015 at 9:21 AM, Saul Kohn <[email protected]> wrote: > So PSA128 recycled PSA64 cables and got 64 new ones. Do we know which > antennas have which? > > Saul Aryeh Kohn > > PhD student > University of Pennsylvania > ----------------------------------------- > ZOO > David Rittenhouse Laboratory > 209 South 33rd Street > Philadelphia PA, 19104 > > On Fri, Feb 6, 2015 at 10:58 AM, danny jacobs <[email protected]> > wrote: > >> Duh. >> So 120ns bounce rcvr to hut.. >> >> >> On Friday, February 6, 2015, David DeBoer <[email protected]> wrote: >> >>> 500 ft ~ 150m ant to receiver >>> >>> Sent from my iPhone >>> >>> On Feb 6, 2015, at 10:50 AM, danny jacobs <[email protected]> >>> wrote: >>> >>> Ant to rcvr are 150 ft ~ 50m, no? >>> >>> On Friday, February 6, 2015, Matt Dexter <[email protected]> wrote: >>> >>>> RX to bulkhead cables >>>> SMAM-LMR240-SMAM-50-CT1 >>>> www.fieldcomponents.com >>>> >>>> SMA Straight Male Crimp Plug on LMR240 to SMA Straight >>>> Male Plug 50 Feet Long >>>> Connectors will be Passivated Stainless Steel >>>> Rubber caps will be put on the ends of the SMA Connectors >>>> Labels will be black shrink with white lettering on the 256 >>>> cables that require labels. Labeled on Both Ends >>>> The last 32 cables will have a >>>> white blank label on both ends of the cable >>>> VSWR 1.35:1 at 4 Ghz >>>> >>>> LMR240 is 1.21ns/ft >>>> 1.21 * 50 = 60.5 ns one way. >>>> >>>> On Fri, 6 Feb 2015, Chris Carilli wrote: >>>> >>>> Date: Fri, 06 Feb 2015 08:37:56 -0700 >>>>> From: Chris Carilli <[email protected]> >>>>> To: [email protected] >>>>> Subject: Re: memo on PAPER 128 autocorrelations >>>>> >>>>> 6MHz = 50m reflection. what in the system is 25m or 50M round trip? >>>>> cables from receivorator to bulkhead? >>>>> >>>>> cc >>>>> >>>>> >>>>> >>>>> On 02/05/2015 01:55 PM, Jonathan Pober wrote: >>>>> >>>>>> Hi everyone, >>>>>> >>>>>> I had a little bit of time today to do some writing, and so jotted >>>>>> down some of the things we noticed looking at the PSA 128 data back in >>>>>> January. There are two sections: (1) looking at a 6 MHz ripple that now >>>>>> shows up in all of our autocorrelation spectra, and (2) looking into >>>>>> Omnical's ability to identify and flag antennas on an initial run. I'm >>>>>> sending this email to the PAPER list, but since this is essentially the >>>>>> exact hardware that will become HERA in 2 months, this may make sense as >>>>>> a >>>>>> HERA memo. I leave it to the powers that be to decide. >>>>>> >>>>>> Jonnie >>>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>> >>> -- >>> Sent from Gmail Mobile >>> >>> >> >> -- >> Sent from Gmail Mobile >> > > -- 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/
