From vicente@cay.oan.es Tue Oct 26 15:46:24 MET 1999
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From: Pablo de Vicente <vicente@cay.oan.es>
Reply-To: vicente@cay.oan.es
Organization: Observatorio Astronomico Nacional
To: Leonid Petrov <petrov@picasso.geod.uni-bonn.de>, vicente@cay.oan.es
Subject: Re: distributor box
Date: Tue, 26 Oct 1999 15:35:05 +0200
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Status: R

Dear Leonid,

>
>  Such a question: is it feasible to switch the cable which feeds phase cal 
>from the distributor box used in Europe51 to the auxiliary box of VLBA 
>equipment for 2 hours? How much time do you need for it? I think about such 
>a strategy in YEWE-test experiment: to observe 1-2 hours with phase cal fed 
>by old box, then after pause to observe with phase cal fed by the new box. 
>Then we will be able to catch a cat (if there is a cat).

 Yes it is possible and I think it is a good idea. It will take some seconds
to change the cables.

>
>>                                          We do have the cable cal ground unit. 
>> and we are already measuring now. I will send the results later today
>
>  Why you don't measure cable length? I thought you don't have ground cable cal 
>unit.

 Good point. Well the cable values are read with an HP Counter through an 
HPIB port. Altough I have told Ed (Himwich) that the HPIB works with the new FS
and the new kernel, it only works well if the FS is not running a schedule. If
your are running a schedule the port reading fails many times, perhaps 80% of
the times I try to read the port. And if it fails the PC hangs for 2 seconds.
Now I am not running a schedule and I have a success rate of 80% instead of 
20% when reading the port.


________________________________________________________
Pablo de Vicente  (vicente@oan.es),  http://www.oan.es,  OAN Spain