archiv~1.txt: Re: SETI Water Hole
Re: SETI Water Hole
Lee Kitchens ( (no email) )
Fri, 26 Mar 1999 07:19:18 -0600
Hola Carlos y SETI de Espana, last year I had the same question when
designing a helix feed. I intended to design at the middle of the Water
Hole and let the relatively wide bandwidth of the helix reach out and grab
the low end and high end of the Water Hole. Last November, Dr. Shuch and I
discussed the hydroxyls. Paul said the highest one (1720. 53) is a weak
one. The two middle ones are stronger and have traditionally defined the
Water Hole. Therefore, we need to scan 1420 to 1667. I'm going for
bandwidth to scan even a little higher. My notes are in storage, and I
believe I designed the feed for 1540 MHz. I am moving to the southwestern
U.S. so I will have mucho opportunity to practice your language and eat in
the local restaurants: my favorite 3 food-groups are paella, sangria, y
chocolate. Adios por uno tiempo poco, Lee.
>I have read that the "Water Hole" is an extremely narrow range of radio
>frequencies between the hydrogen line of 1420 megahertz and the first
>hydroxyl line of 1662 megahertz, but The Committee on Radio Astronomy
>Frequencies (CRAF) showed 4 Hydroxyl lines.
>Can anybody say me what is the real range that owns the "Water Hole"?