[evlatests] [Vlite-external] WIDAR P-band status update: 20APR2015

[Rob Selina]

Hi Huib, 

Thanks for the report. 

The switched power issues appear to be associated with the F318 installations. When you ran the script, we had F318s installed in EA03, EA05, EA06, EA11 and EA19 (EA20 is a separate issue).

Looking at the device browser, the control points for the cal signals appear to be turned off (FE_A_Calib_Cmd = 0 ...I think it should be set to 3). We'll follow up to make sure this is set as part of the default setup. 

Cheers,

Rob


-----Original Message-----
From: Vlite-external [mailto:vlite-external-bounces at listmgr.nrao.edu] On Behalf Of Huib Intema (NRAO)
Sent: Wednesday, April 22, 2015 4:16 PM
To: EVLA test; VLITE external
Subject: [Vlite-external] WIDAR P-band status update: 20APR2015

Dear P-banders,

Here is the outcome of a short VLA WIDAR P-band status test (few minutes on 3C48) we ran on April 20. EA17 was out. Unfortunately, several antennas have no switched power. And as usual, quite a few have bandpass ripples.

Major points of attention are:

+ EA13 no longer has low power nor erratic bandpass shape in YRH (thanks
for the fix!)

~ EA05 no longer has fast bandpass ripple (fixed or transient?) ~ EA19 no longer has fast bandpass ripple on XLV and YRH (fixed or
transient?)

- EA02 has 10 percent bandpass ripple on XLV and YRH (both 6.2 MHz = 24 m)
- EA03 has 20 percent bandpass ripple on XLV and YRH (both 3.1 MHz = 48 m)
- EA03 has no switched power
- EA04 has 20 percent bandpass ripple on XLV (20 MHz = 7.5 m)
- EA05 has no switched power
- EA06 has no switched power
- EA08 has 10 percent bandpass ripple on YRH (3.6 MHz = 42 m)
- EA11 has no switched power
- EA13 has 20 percent bandpass ripple on XLV (20 MHz = 7.5 m)
- EA14 has 40 percent bandpass ripple on XLV (20 MHz = 7.5 m)
- EA14 has 20 percent bandpass ripple on YRH (20 MHz = 7.5 m)
- EA15 has 13 percent power in the cross-polarizations
- EA19 has no switched power
- EA20 has 30 percent bandpass ripple on XLV (20 MHz = 7.5 m)
- EA20 has 13 percent power in the cross-polarizations
- EA20 switched power varies over time (factor of two)
- EA21 has 30 percent bandpass ripple on XLV (140 MHz = 1.1 m)
- EA21 has 50 percent power on XLV
- EA26 has deformatter problem on XLV (already reported to Vivek)
- EA28 has 10 percent bandpass ripple on XLP (3.6 MHz = 42 m)

-- Huib


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