[evlatests] ea 21, V-pol P-band -- still weak

[Lilia Tremou]

Updates on the ea21 P-band , V pol:

I checked the latest 4P stress test  (taken on Monday the 16th) as well as the yesterday’s systartP and all looks good.

Thanks all for the help!

Lilia






From: evlatests <evlatests-bounces at listmgr.nrao.edu> on behalf of Rob Long via evlatests <evlatests at listmgr.nrao.edu>
Date: Friday, November 22, 2024 at 09:08
To: Rick Perley <rperley at nrao.edu>, evlatests <evlatests at nrao.edu>
Subject: Re: [evlatests] ea 21, V-pol P-band -- still weak

Hey Rick,



We checked vlite data this morning and sure enough, the signal looked great after maintenance and then just dropped out! We obviously have more than one issue on that antenna.



We will be out to continue the hunt next maintenance day.



Rob


On 11/21/2024 4:37 PM, Rick Perley via evlatests wrote:
New data taken at P-band show that the gains for ea21, 'V' polarization are still low by about an order of magnitude.

An additional feature has appeared:  The passband now has a significant ripple of 4 MHz period — corresponding to a cable reflection of length about 35 meters (free space equivalent).

Rick



_______________________________________________

evlatests mailing list

evlatests at listmgr.nrao.edu<mailto:evlatests at listmgr.nrao.edu>

https://listmgr.nrao.edu/mailman/listinfo/evlatests
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listmgr.nrao.edu/pipermail/evlatests/attachments/20241218/80631d63/attachment.html>