[evlatests] EVLA Hardware

[Mike Revnell]

In re. delay changes. The EDFAs consist mainly of a rather long piece of 
fiber. It seems to be difficult to find out just how long this is. The 
only information I could find on the web seems to indicated numbers 
between 5 and 100 meters. We can probably expect our EDFAs to add some 
tens of meters of fiber delays.

Yesterday I wouldn't have been surprised to learn this was a Km or two but 
that was pessimistic.


Mike Revnell
National Radio Astronomy Observatory
Socorro, New Mexico
mrevnell at nrao.edu
revnell at ieee.org

On Wed, 14 Jun 2006, Rob Long wrote:

> Ant 13 was moved today and seems to have some strange problems. (See Ken's 
> email)  The L305 was not happy after the move and had to be power cycled 
> before it would lock up to the 512 MHz reference.  Once the receive level was 
> set and everything re-sync'd, the hardware appeared to be functioning 
> properly.  Both deformatter statistics and the Baseband overlay indicated 
> good signal levels and connectivity.  The EDFA for the IF fiber was disabled 
> at this time and the fiber was routed directly to the de-mux.
>
> Ant 16 has the L302-1 re-installed and working.  It is the same module with 
> the same firmware, but has a different DDS board (with heatsinks) installed.
>
> Very busy day, still have not installed U/X converter in ant 18.
>
> Ant 24 has a cold X-band receiver and two working IFs (A & C).  It has the 
> lock removed and is ready for first fringes.
>
> Rob
>
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