[evlatests] early VHF results

[Scheduling Officer]

Yikes! With the dipoles up, we should avoid doing polarimetry tonight. But 
we are not yet organized to be able to prevent that. When will the dipoles 
be removed? Is there a test plan for their deployment and removal? Thanks.
- Joan

EVLA/VLBA Scheduling Officers
schedsoc at nrao.edu, NRAO, Socorro, NM, USA
https://science.nrao.edu/facilities/evla/schedules/schedsoc

On Thu, 26 Jan 2012, Ken Sowinski wrote:

> Antennas ea19 and ea25 have been outfitted with receivers and dipoles.
> A first test was a simple observation using two subbands to cover
> 222 MHz to 470 MHz, and a third subband in the other IF piar to
> (erroneously) cover 80 to 112 MHz.  A few minutes of such data is
> available as VHFsysstart_005 from this afternoon.
>
> 1.  ea19C is very weak as seen at the downconverter.
> 2.  No 75 MHz correlated power was seen because I had mistuned.
> 3.  300 MHz correlated power appeared in the crossed hand term
>     which did not include 19C.  We can just swap cables at one
>     of the antennas but eventually we should try to determine
>     which is correct.
>
> Tomorrow the low power from 19C will be addressed, I will retune
> the 75 MHz subband, and we will try to take a little data that can
> be looked at with some care.
>
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