[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

f/d ratio Scott - Gil - Dr. Jim

Thank you to: Scott, Gil and Dr. Jim. This -bb is wonderful! Well, I have
the old 5Ghz feed and so it was very easy once I knew what to do with the
dimensions. The answer: 0.37. I am in good shape. Dr., I love your style. Do
the math, or just use the ruler and real waves hitting the dish. Hands on...
One will never forget the answer to this question.

I know the high squint is very detrimental to to S Band downlink. However,
even with squints of 5-15, I am only seeing S8.5 to S 9 on the beacon and of
course the QSOs are 10 db down, which puts them to close to my noise floor
at S 5 -5.5. I calibrated my S meter, and while not linear, it is basically
2.75db per S unit. My ears are not what they used to be (I am in the
commercial broadcast business--Earphones for to many years)plus I like
quality audio. I want at least 10-12db of quieting. SO, my 60cm dish with
UEK-3000 can not be improved upon. I need more wave fronts pinging on my
feed. This old dish, with the Patch feed will, I hope, give me ears as big
as my mouth.Hi
The next issue is of course az/el steering. My first plan was to use a
second G-5500 slaved to the original which is doing my uplink. As you so
aptly point out, I am trading one problem for another. At first glance,
weight and torque do not appear to be a problem with a well counterbalanced
dish. STOPPING at the correct place is another matter. Well, this will give
me something to ponder  this week.
Again thanks for all your help.
Gunther Meisse

Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org