[asac][almanews]ALMA Memo 436

[Carolyn White]

ALMA MEMO #436

Band 6 Receiver Noise Measurements using a Pre- Prototype YIG-Tunable LO
Eric W. Bryerton, S. K. Pan, Dorsey Thacker, and Kamaljeet Saini

In this memo, we present measured receiver noise data of a 200-300 GHz SIS 
mixer driven by a pre-prototype of the YIG-tunable LO driver followed by a 
varistor tripler. After identifying and solving some signal-to-noise 
problems in the LO driver chain, measurements were taken from 220-270 GHz 
showing an average noise over a 4-12 GHz IF less than 5 K for the worst LO 
frequency over the identical mixer and varistor tripler being driven by a 
W-band Gunn oscillator. The average excess noise over all measured LO 
frequencies is 1.4 K. The optimum LO driver for which these measurements 
were taken includes a YIG-tuned filter (YTF). LO driver configuration 
options without the YTF are explored with encouraging initial results.

View a pdf version of ALMA Memo #436.
http://www.alma.nrao.edu/memos/html-memos/alma436/memo436.pdf

Download a postscript version of ALMA Memo #436.
http://www.alma.nrao.edu/memos/html-memos/alma436/memo436.ps

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