On October 20, 2008 at 21:49, hd fan said...
I am using a GT SAT GT-S40 Universal LNB
Interesting. That's a LOT lower cost than the Invacom QPH I was considering. Where did you buy your LNB? The only dealers I saw were in Europe. I can get it there too, but if its available locally that's a plus.
I also read yesterday about 121W AMC 21 on the SatelliteGuys.US
forums giving problems to 123W G18 reception. Like you
say lyngsat does not list anything. I beleive some SatelliteGuys.US
user wanted to try to find an anwser using a Spectrum
analizer or something similar. In my case apparently
I aimed the dish more toward 121W therefore nothing from
123W interfered me.
I don't think you need a spectrum analyser. Just point the dish and plug in the transponder frequency. It should show signal strength if anything is there. This is easier for the dish-motor crowd of course.
My offset 90cm Fortec complays with the 2 degrees spacing
(+- 1.97 degrees signal goes down 3db) so theoretically
if aimed properly it will not get interference from either
neighbour Sat
It sounds like I have the same sized dish as you. But mine does have a mild dent in it. Also, I have it mounted sideways so perhaps I'm not benefiting from the best axis?
mention website you will find the values. A bigger Dish
will be your solution apparently but the interference
could be a temporary problem , maybe they are testing
those TP or who knows. Time will tell.
I'm guessing that if its on now, they won't be turning it off as it wouldn't be good business.
you mention the focal point. I have not been
able to find any documentation pertaining to the focal
point of my 90 cm Fortec Star Offset Dish.
Okay, on mine you can adjust the skew and the position of the LNB within the bracket that holds it. Its an adjustment of about only 1.25" though. It does make a slight improvement when optimizing.
What is your experience/opinion
on that?
I found there was a difference between the calculated skew and the one which netted the best signal strength. The fellow at the store said for 123° just set it to 45°. I found it closer to, but not exactly, the 35° I calculated. Splitting hairs here though. At 45° it will give you enough signal to lock the dish position and then you can optimize.
You are right the typical LO stability of a cheap consumer
grade LNB is +- 1 Mhz. Imagine the cheap FTA Box!!!!.
At these frequencies +/-1MHz is actually very good!
Come to think of it, the fRef in the satellite is probably atomic. I'm guessing there's quite a temperature swing as the bird orbits the earth in geosynchronicity. I won't worry about that though. :)
