0000285: The cross correlations of 7X*X,7Y*Y(MFFE-01) have no Ampls at Lband, intermittent.

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Category

Severity

Reproducibility

Date Submitted

Last Update

0000285

[MFFE] 0.unknown/unspecified

major

sometimes

11-08-10 13:58

31-08-10 14:29

Reporter

Yuan Tang

View Status

public

Assigned To

Harm-Jan Stiepel

Priority

normal

Resolution

open

Status

resolved

Summary

0000285: The cross correlations of 7X*X,7Y*Y(MFFE-01) have no Ampls at Lband, intermittent.

Description

The cross correlations of 7X*X,7Y*Y(MFFE-01) have no Ampls at Lband, intermittent.
(the LO locking problem?)

Additional Information

20100812:
Hans van der Marel found it could be caused by the intermittent bad connection
of LO cable, e.g. there is water in the cable.

20100813:
On the RT7 the LO signal is quite often missed around HA -90 deg. It may cause
by the bad HA jumper cable for the LO in RT7.

MFFE

MFFE-band

21cm

polarisation

X, Y

sky frequency (MHz)

Attached Files

Relationships

Notes
(0000299) Yuan Tang 31-08-10 14:29	20100831: On 17-08-2010 Pieter Donker had done as the folllowing: Bij RT7 heb de LO kabel verwisselt. Boven in de FE box is de LO op geel gezet (was groen). Beneden in het huisje zijn geel en groen verwisselt. The problem does not appear till now.

Issue History
Date Modified	Username	Field	Change
11-08-10 13:58	Yuan Tang	New Issue
11-08-10 13:58	Yuan Tang	MFFE	=> 01
11-08-10 13:58	Yuan Tang	RT	=> 7
11-08-10 13:58	Yuan Tang	MFFE-band	=> 21cm
11-08-10 13:58	Yuan Tang	polarisation	=> X, Y
11-08-10 13:58	Yuan Tang	Assigned To	=> Harm-Jan Stiepel
11-08-10 13:58	Yuan Tang	Status	new => assigned
12-08-10 14:14	Yuan Tang	Additional Information Updated
12-08-10 14:16	Yuan Tang	Additional Information Updated
13-08-10 12:36	Yuan Tang	Additional Information Updated
31-08-10 14:29	Yuan Tang	Note Added: 0000299
31-08-10 14:29	Yuan Tang	Status	assigned => resolved