[mmaimcal] antenna stations

[Simon Radford]

Leonia,

Thanks for the clarification and the reminder.

I should have distinguished between your "donut" configurations, where
there are inner and outer rings for each configuration, and simple
"rings", where each configuration has only one ring. Your donut
configurations achieve what I called "linear reuse." Scaled to the ALMA
parameters, they would have a total of 235 stations.

The VLA, by the way, actually does better than linear reuse. Each arm
has 24 stations that support four configurations for 9 antennae. So the
reuse fraction alpha = 4/9. Scaled to the ALMA paramters, beta = 3.2 and
there would be a total of 207 stations.

Simon

> Subject: Re: [mmaimcal] antenna stations
>    Date: Mon, 13 Dec 1999 20:35:33 -0700 (MST)
>    From: "[Leonia Kogan]" <lkogan at aoc.nrao.edu>
>      To: sradford at nrao.edu
> 
> Simon,
> 
> You wrote:
> 
> >Concentric ring configurations would have little or no reuse. 
> 
> I think this statement is not true. In the example given in my memo #226
> 110 pads used instead of 144 (>30% is reused). This result is achieved 
> due to using the outer circle of the next configuration as the inner circle of 
> the previous configuration and due to using partially the same pads at 
> the common circle.
> 
> Leonia