[evlatests] 4 band (fwd)

[Ken Sowinski]

Mark suggested I forward this report to a wider audience.
Summary: 14 and 18BD work at 4 band.  18AC still has a
problem whose symptom is a strong birdie seen in
autocorrelation.


---------- Forwarded message ----------
Date: Thu, 5 Oct 2006 20:50:50 -0600
From: Mark Claussen <mclausse at nrao.edu>
To: Rick Perley <rperley at aoc.nrao.edu>
Cc: Ken Sowinski <ksowinsk at aoc.nrao.edu>, mclaussen at nrao.edu
Subject: Re: 4 band

On Thursday 05 October 2006 19:35, Rick Perley wrote:
>     Hmmm:
>
>     In my test, I filled with all flags off, and *NO* 4-band data were
> recorded.  That means that I didn't even have the luxury of looking at
> numbers -- there was nothing but blanks.  How can that happen?
>
>     Rick
>


Hmm,

I filled data from APEVLA 20061005 0 23 0 0 0 23 59 0
(*without* flags turned off) and got data from An 14 and An 18.

Nice 4 band fringes for An 14.  No fringes to 18 on the AC pair,
but nice fringes on the BD pair.  There is indeed a birdie in 18A
near the band edge (right now I don't want to figure out
which edge - 0 channel edge).  One *might* convince oneself
that there are very weak fringes on 18C.

So whatever whatever you did this afternoon more-or-less worked,
especially for 14 and 1/2 of 18.

Chuck will be happi(er).

Mark