[evlatests] Single dish vlbi

[Walter Brisken]

>> Spectral line did not work.  I suspect it was the correlator controler
>> that got unhappy, since idcaf said 'no visibility data received'.
>
> Not too surprising.  I will be back next week and will work with
> Walter to be sure that the correlator controller and idcaf are
> thinking the same way about this.

It is the reception of data from the correlator that clocks out the idcaf 
records.  Had there been a non-trivial second sub-array, idcaf would 
probably have gotten the data it expected and no complaint would have come 
out.  I can change the write trigger in cases where records without data 
are requested.

For 1 antenna subarrays I'd be tempted to just write out records that have 
four zero length CDAs -- is this legal?  I don't think there is any need 
for the autocorrelations, or is there?

These are easy issues to address, but as Ken says we should probably 
communicate with each other first to make sure we all know what to expect.

-W