archive: SETI Some Questions

SETI Some Questions

Peter J. Thompson ( (no email) )
Mon, 31 Aug 1998 08:43:30 -0400

Here's a bunch of assorted questions for Monday morning...

I understand that one of the goals of Project Argus stations is to cover the frequency range 1420 - 1660 MHz. Maybe I missed it in some of the online documentation but is it the intent that each station be capable of scanning this entire range or are individual sites assigned a smaller chunk of spectrum?

Are the stations that are downconverting scanning the same amount of spectrum as those that have micowave-capable receviers? What are the tradeoffs involved here?

From what I've seen of the converter lierature etc, it appears that downconversion is taking place after the microwave signal has been fed from the feedhorn/LNA via cable to the location of the radio equipment. Wouldn't it be better to place the converter at the feedpoint and pipe a vhf or hf signal to the shack? Is this what I've seen referred to as an LNB?

As far as digital signal processing is concerned, is everybody still doing the DSP part at audio frequencies? What is the state of the art concerning DSP chips these days? Can we expect to be doing DSP at the IF some day soon? With 400MHz PC's generally available, I've got to believe there are some super fast but probably (still) expensive DSP chips available.


Peter J. Thompson *I speak only for myself*
Taratec Development Corporation
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