EVLA

Quick–Links

(formerly known as GOTO)

Some files are not accessible from non-NRAO computers.

Information on the EVLA Up- and Down-converters is found on the following pages

The following EVLA Converter modules were designed and built by Paul Harden:

T301 4/P Converter — Upconverts the 74, 196 & 327 MHz receivers to L-band (1.0–1.4 GHz) IF

T302 LSC Converter — Upconverts the L-, S- and C-band receivers (1–8 GHz) to the 8–12 GHz X-band IF

T303 UX Converter — Downconverts the Ku-, K-, Ka and Q-band receivers 8–18 GHz direct RF or

intermediate 8–18 GHz outputs to the 8–12 GHz X-band IF

Notes: Spectral Power not specified for narrow band receivers (74, 196 and 327 MHz receivers) • Per latest system block diagram and the EVLA Project Book.

ROSETTA STONE for the . . . IF OUTPUT SCHEME

IF Channel	POLARIZATION	LO Channel or Synthesizer	LO/Polarization Relationship
IF – A	RCP †	LO – 1	RCP = IF – A/B
IF – B	RCP †	LO – 2	LCP = IF – C/D
IF – C	LCP †	LO – 1	LO-1 = IF – A/C
IF – D	LCP †	LO – 2	LO-2 = IF – B/D

† RCP = Right-hand circular polarization † LCP = Left-hand circular polarization

SAFETY TIP: Accidentally swapping the IF outputs from scheme shown above can cause a galactic wide reversal of all polarized energy, imploding this quadrant of our galaxy — and destroying all life on our planet as we know it.

Adherance to this safety tip will be appreciated.

A Few PHOTOS of the VLA Antennas with the new EVLA Electronics
Only a few, since after posting these, the Division Head revoked my right to use the department's digital camera until further notice

THE END
(Nice way of saying it's all I can think of at the moment)

This website approved by:
Saginaw City Tire and Recap Consortium, Retread Division


BAND	4–Band	2–Band	P–Band	L–Band	S–Band	C–Band	X–Band	Ku–Band	K–Band	Ka–Band	Q–Band
"Sky" Frequency	73–76 MHz	190–200 MHz	308–348 MHz	1–2 GHz	2–4 GHz	4–8 GHz	8–12 GHz	12–18 GHz	18–26 GHz	26–40 GHz	40–52 GHz
Receiver Output Frequency	73–76 MHz	190–200 MHz	308–348 MHz	1–2 GHz	2–4 GHz	4–8 GHz	8–12 GHz	12–18 GHz	8–18 GHz	8–18 GHz	8–18 GHz
Receiver Output Total Power	–55dBm /2MHz	TBD	–55dBm /40MHz	–37dBm /1.2GHz	–34dBm /2.4GHz	–32dBm /4.4GHz	–31dBm /4GHz	–36dBm /6GHz	–38dBm /10GHz	–36dBm /14GHz	–36dBm /12GHz
Spectral Power	Narrow band	Narrow band	Narrow band	–39dBm/GHz	–34dBm/GHz	–39dBm/GHz	–38dBm/GHz	–48dBm/GHz	–48dBm/GHz	–47dBm/GHz	–47dBm/GHz

Me in the antenna one winter day, standing in front of the EVLA IF/LO Rack in the Vertex Room (electronics room, directly under the dish).

Only highly trained professionals are allowed to look this puzzled - such as System Engineers Rob Long and Jim Jackson.

Front End engineer Bob Hayward working on the cryogenically cooled (15K) L-band receiver while pointing to the radio sky.

Note: Old style L-band

receiver shown.

Testing the initial prototype designs of the 4/P, LSC and UX Converters, 2004.

On the rack (top to bottom), UX Converter with DAQ-1, LSC Converter with DAQ-1, 4/P Converter with DAQ-1, M301 Converter Interface and the 48V
"Shock and Awe" power supply (before P301s). Scalar network analyzer on left.

Home page

Last update:

01 Mar 2010

pharden@nrao.edu


	EA 19	EA 11	EA 25	EA 01	EA 04	EA 05	EA 02	EA 03	EA 28
T301 4/P	S/N B-06 05-07	S/N B-08 07-07	S/N B-09 09-07	S/N B-12 01-08	S/N B-14 02-08	S/N B-13 03-08	S/N B-16 05-08	S/N B-15 07-08	S/N B-19 08-08
T302 LSC	S/N B-10 05-07	S/N B-11 07-07	S/N B-12 09-07	S/N B-15 01-08	S/N B-17 04-08	S/N B-16 04-08	S/N B-18 05-08	S/N B-19 07-08	S/N B-03 08-08
T303 UX	S/N B-11 05-07	S/N B-12 07-07	S/N B-03 09-07	S/N B-13 08-06	S/N B-14 02-08	S/N B-15 03-08	S/N B-16 05-08	S/N B-17 07-08	S/N B-19 08-08
Installation	05-07	07-07	09-07	12-07	02-08	04-08	06-08	07-08	09-08

NRAO webpage for Paul Harden, VLA/EVLA IF/LO Lab, x7142

EVLA IF/LO Pages

Possible nifty stuff about the VLA expansion (EVLA)

Page 1

T301 4/P Converter

T302 LSC Converter

T303 UX Converter

EVLA Band definitions here

LO/IF Polarization scheme here

Installation Status here

A few photos here

**MODULE & EVLA INSTALLATION STATUS**
	EA 13	EA 14	EA 16	EA 18	EA 24	EA 26	EA 23	EA 17	EA 21
T301 4/P	S/N B-10 09-07	S/N B-11 09-07	none (no M301	S/N B-04 05-07	S/N B-05 05-07	S/N B-07 05-07	S/N B-01 02-07	S/N B-02 12-06	S/N B-03 02-07
T302 LSC	S/N B-03 10-05	S/N A-02 02-06	S/N A-01 04-06	S/N B-04 06-06	S/N B-05 08-06	S/N B-06 10-06	S/N B-07 12-06	S/N B-08 12-06	S/N B-09 02-07
T303 UX	S/N B-10 05-07	Coax* 01-06	S/N A-02 04-06	S/N B-04 06-06	S/N B-05 08-06	S/N B-06 10-06	S/N B-07 10-06	S/N B-08 01-07	S/N B-09 01-07
Installation	10-05	02-06	04-06	06-06	08-06	10-06	12-06	01-07	02-07

* Coaxial version UX Converter in Ant. 14; all others are MMIC (Norden) version.

Installation Status

EVLA Band Definitions

LO/IF Polarization Scheme

Mini Photo Gallery


	EA 09	EA 15	EA 08	EA 27	EA 07	EA 06	EA 20	EA 22	EA 12	EA 10
T301 4/P	S/N B-18 11-08	S/N B-22 02-09	S/N B-21 03-09	S/N B-17 04-09	S/N B-24 07-09	S/N B-23 09-09	S/N B-26 11-09	S/N B-31 02-10	Due 02-10	Due 04-10
T302 LSC	S/N B-04 11-08	S/N B-21 02-09	S/N B-23 03-09	S/N B-22 04-09	S/N C-24 07-09	S/N C-10 09-09	S/N B-26 11-09	S/N C-28 02-10	Due 02-10	Due 04-10
T303 UX	S/N B-18 11-08	S/N B-21 02-09	S/N B-20 03-09	S/N B-23 04-09	S/N B-22 07-09	S/N B-24 09-09	S/N B-25 11-09	S/N B-26 02-10	Due 02-10	Due 04-10
Installation	11-08	03-09	03-09	04-09	08-09	09-09	11-09	02-10	Pending	Pending