GMRT ANTENNA UPGRADATION STATUS

 

Ant Name

Ant

ID

UPS

LO

FSW

Broad-band RF

Servo

PC104

GAB

2-POL

FSW

BLDC

130MHz-260MHz

250MHz-500MHz

550MHz-900MHz

Common Box

Important Notes

Ant Name

OFC

LPF CH1

FEED

FE

NF

Temp

PM

NG

FEED

FE

NF

Temp

PM

SBF

NG

FEED

FE

SBF

NF

PM

Temp

NG

Amp

Temp

PM

C00

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C00

C01

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C01

C02

5

 

 

 

 

 

 

 

C02

C03

1

 

 

 

 

 

 

 

 

 

 

 

 

C03

C04

3

 

 

 

 

 

 

 

 

 

 

 

 

 

C04

C05

19

 

 

 

 

 

 

 

 

 

 

 

C05

C06

20

 

 

 

 

 

 

 

 

 

 

C06

C08

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C08

C09

4

 

 

 

 

 

 

 

 

 

 

 

 

C09

C10

12

 

 

 

 

 

C10

C11

9

 

 

 

 

 

 

 

 

C11

C12

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C12

C13

11

 

 

 

painting

C13

C14

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C14

W01

8

 

 

 

 

 

 

 

W01

W02

13

 

 

 

 

 

 

 

W02

W03

14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W03

W04

15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W04

W05

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W05

W06

25

 

 

 

 

 

 

 

 

 

 

 

W06

E02

17

 

 

 

 

 

E02

E03

18

 

 

 

 

 

 

 

 

 

 

 

painting

E03

E04

21

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E04

E05

22

 

 

 

 

 

 

 

 

 

 

 

 

 

E05

E06

23

 

 

 

 

 

 

 

 

 

 

 

E06

S01

26

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S01

S02

27

 

 

 

 

 

 

 

 

 

 

S02

S03

28

 

 

 

 

 

 

 

 

S03

S04

29

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S04

S06

30

 

 

 

 

 

 

 

 

 

 

 

 

S06

TOTAL

16

11

30

10

30

30

30

8

8

0

8

8

0

30

30

29

30

30

29

29

19

23

19

19

19

19

19

16

7

7

3

TOTAL

Conventions used in above table:

 OFC – Optical Fibre Cable, LPF – Low Pass Filter, FE – Front End, NF – Notch Filter, Temp – Temperature monitoring, PM – Power Monitoring, SBF – Sub-Band Filter, NG – Noise Generator, Amp – Amplifire etc.

LIST of  ANTENNAS under PAINTING

Weekdays    

SUNDAY To  FRIDAY

MONDAY To  SATURDAY

Antennas under painting

C13

C13, and E03(FCP)

Upgradation jobs with respect to antennas :          ww  antennas with UPS  ww  antennas without UPS.  

                130MHz-260MHz -  Dual-Ring Feed @ 150MHz                        250MHz-500MHz - Cone-Dipole Feed @ 325MHz                550MHz-900MHz -Cone-Dipole Feed @ 610MHz

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

 

  Antenna status as per  completion of up-gradation jobs :

 

Servo (PC104)

Broad Band RF

(OFC)

LOFSW

Broad Band Feed

Antenas with BLDC

Antenna  Diesel Generator Alarm

Antennas with UPS

130-260 MHz @ 150MHz

250-500 MHz @ 325MHz

550-900 MHz @ 610MHz

ALL 30 ANTENNAS DONE.

ALL 30 ANTENNAS DONE.

C02, C05, C10, C12, C14,W02,W05, W06, E06, S02, S06

C10,W01,S03,E02,C13,

W02,C02,C04

ALL 30 ANTENNAS DONE.

C10, E02, W01, S03, C02, S06, E06, W06, C06, C09, C13, C05, C03 and C11, E03, E05, W02, S02, W02, (ver2 all antennas)

ALL 30 ANTENNAS DONE.

 E04, E05, E06, W03, W04, W05, W06, S03, S04, S06.

C01, C03, C04, C05, C06, C08, C10, C11, C13, C14, E02, E03, S01, S02, W01, W02,

 

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

 

GWB (GMRT WIDE-BAND BACK-END) :

 This is the New Correlator Back-end at GMRT in the Broad-band RF Signal receiver chain.

 Broad-Band RF From Antenna is taken to the GAB (GMRT Analog backend) through upgraded Optical Fiber. All antennas can be configured  and monitored  at GAB, and out of which any 32 antennas with Broadband Feed and RF facilities listed above for 1pol or any 16 antennas with dual pol can be chosen for GWB.

 

 GWB-IV (version 4) is the latest release, It accepts 64 input connections. These 64 input connections can be configured as 32 antennas Dual polarization inputs. (either Total Intensity or Full Stokes).

This release supports, 400/200/100 MHz wide band observations with maximum16 K spectral channels can be configured. Also, 4 Beam selections including raw voltage and coherent de-dispersion pipeline are available for pulsar observations with varying beam integration values ( in ms). This release also supports multi-sub-array observations. Detailed release configuration of GWB is as in table below:

 

 GWB-IV supports various available modes for pulsar, continuum and line frequency observations. Best possible mode, depending on user requirement can be chosen using gwb4calculator.pl on astro8 machine.

 

 

400 MHz (TI/FS)

200 MHz (TI/FS)

100 MHz (TI/FS)

50 MHz (TI/FS)

25 MHz (TI/FS)

12.5 MHz (TI/FS)

6.25 MHz (TI/FS)

3.125 MHz (TI/FS)

1.5625 MHz (TI/FS)

1024 Channels

2048 Channels

4096 Channels

8192 Channels

16384 Channels

 

    allant;cp 0;defs 0;suba 0;

  for more details please refer file - `lenyadri:/odisk/online1/INFO/GAB_ONLINE.SOP`

 

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

 

Settings for 150 / 235 MHz

Antenna

FEED

RF

LO (for 150 MHz)

LO (for 235 MHz)

C10 W01 E02 S03 C13 W02 C02 C04

150

150

218

304

         

250-500 Broadband FEED  (VERSION 2 - FINAL) :

 550-900 Broadband FEED  (VERSION 2 - FINAL) :

 

The command for the selection has to run from cdsetm file (on shivneri/lenyadri) in the control room.

1. For full band (250-500 MHz) Observation:

 a) Using cdset4, use default 325 MHz RF command

 b) Using cdsetm, use RF as 470 MHz to get full band

 

2. For sub-band observation use cdsetm command to set RF bands as follows

a) For band 1: 250-350 MHz => RF setting 290

b) For band 2: 300-400 MHz => RF setting 325

c) For Band 3: 350-450 MHz => RF setting 350

d) For Band 4: 420-500 MHz => RF setting 410

e) For Full band (250-500 MHz) => RF setting 470.

 

Antennas with 250-500 MHz Ver1 :

W03

 

Antennas with 250-500 MHz Ver2 : (USE - cdsetm/cdsetm4)

All Antennas Except W03.

 

The command for the selection has to run from cdsetm file (on shivneri/lenyadri) in the control room.

The command are as follows:

 

               Band                           Command

1. RF 550-900 MHz (Full-Band):              725 MHz.

2. RF 550-650 MHz (Sub-Band):               600 MHz.

3. RF 635-735 MHz (Sub-Band):               685 MHz.

4. RF 720-820 MHz (Sub-Band):               770 MHz.

5. RF 800-900 MHz (Sub-Band):               850 MHz.

 

Antennas with Narrow band filter @ 610 MHz (old FEED) :

C00,C08,W04,W05,E04,S01,S04,

 

Antennas with Broad band filter @ 610 MHz (old FEED, modified filters) :

C01,C04,C12,C14,

 

Antennas with 550-900 MHz ver2 (final) : (USE - cdsetm/cdsetm4)

 C10,E02,W01,S03,C02,S06,E06,W06,C06,C09,C13,C05,C03,C11,E03, E05,W03,W02,S02

 

MCM-4 ( FE Parameter control Unit) through online CDSETM4 (C02 and C05):

Antennas C02 and C05 are enabled with MCM 4, to set upgraded FE parameters. The required command set has been modified and implemented byMr. Jitendra. The SOP for issuing the Control command for FES parameters as follows:

 Add MCM-4 in 'online'

 use  'cdsetm4' for FES parameter setting

 'run fe4mcm' --To execute parameters setting

Please Ensure that now onwards for C02 and  C05 antenna all FES parameters ( walsh, noise and mcm) has to be executed using 'cdsetm4' only

  ** For 325 MHz : use broad-band feed instructions ad mentioned under Para A above.

 

Notes :

 

-------

Last Updated on 23rd June 2017.

 

Email : nilesh@gmrt.ncra.tifr.res.in