[evla-sw-discuss] VLA antennas and the EVLA parameters database

[Ken Sowinski]

On Wed, 28 Jun 2006, Barry Clark wrote:

> DCS is stored in the database as an octal number.  At the moment, the
> Executor doesn't distinguish DCS and DelayLine.

Octal it is.  I am ignoring delay line number.  If we have to
support PT I had supposed that we would figure out something
at the time.

> Will take a little
> fiddling if we want to support PT in the style to which it has become
> accustomed.

> How should we store delays in the database?  I'm thinking a pad delay, 
> an antenna delay, and four delays per band per antenna for the IFs. 
> (Gets a little confusing because pad delays are very different for VLA 
> and EVLA.)

Yes pad delays will be a little confusing.  Perhaps two of them;
a WG delay and a fiber delay to add even more confusion.  When
the DTS resyncs we get a delay jump of a few nanoseconds.  I have
wondered if we wanted an IF based delay which is applied to all
bands to account for this with less fuss.  The danger, again,
is that all these free parameters will just let us confuse ourselves.