[evlatests] X-Band Tsys for the First EVLA Receiver

[Gordon Coutts]

All,

 

The following are the results of initial Tsys and Trcvr measurements on the
first wideband X-band receiver on Antenna 7. Measurements were taken using a
spectrum analyzer connected to the front end outputs. The assumptions for
spillover, atmosphere and CMB emission are identical to Rick's 12K value.

 

 

                                Tsys (K)                                Trx
(K)   

________________________________________

Freq (GHz)          RCP        LCP                         RCP        LCP

________________________________________

8                              31           29                           19
16

8.5                          29           28                           17
15

9                              29           27                           17
15

9.5                          27           25                           15
13

10                           26           25                           14
13

10.5                        28           28                           16
16

11                           26           26                           14
14

11.5                        28           27                           17
15

12                           34           34                           22
22

 

 

It is interesting to note that the lab measurements of Trx are a few K lower
than the above values. Assuming the lab measurements are correct, the most
likely cause of the discrepancy is that the spillover contribution is higher
than we assumed.

 

Regards,

Gordon

 

 

 

Dr. Gordon M. Coutts

Research Engineer

National Radio Astronomy Observatory

Science Operations Center

P.O. Box 0

Socorro, NM  87801-0387

USA

Tel:   +1-575-835-7169

Fax:  +1-575-835-7027

 

 

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