At 05:15 PM 7/6/97, you wrote:
>>> It wasn't that good and we ended up
>locating all
>of the splices with the help of a TDR, digging them up and redoing them
>. <<
>
>Gee... If you really mean hardline (and in radio astronomy I believe
>that you mean real hardline -- frequently run with refrigeration lines
>for the low noise head) you would think that there would be a high
>quality dehydrator circulating and constantly drying the air (or other
>gas) that becomes the dielectric in the transmission line.
>
>Joe / W8SS
Yep, I mean hardline--basic foam-filled 7/8 inch, 100 ohm stuff that was
surplus.
Not all radio astronomy is at microwaves. We did a lot of HF and low VHF
radio astronomy--primarily Jupiter--Io effect and solar emissions.
Sky background was the limiting factor. This was a low budget operation--
hence the ammo boxes to protect the splices--but it this case the "protection"
was the problem.
John W0UN
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