Latest News and Discussion about the use of the DATV transponder on Es'hail-2
- Posts: 77
- Joined: Thu Nov 21, 2013 5:29 pm
anyone give any pointers on focal point setting prime focus IRTI 1.5m dish i measured the original FP to be about 625mm from the tip of the scalar rings on the original feed horn.. i assume i simply use these same measurements for new lnb and patch antenna waveguide then i put the cap on..?
23cms AATV from io83qn ( wn68ns )
23cms DATV from i083qn ( wn68ns )
70cms DATV from io83qn ( wn68ns )
- Posts: 21
- Joined: Fri Apr 12, 2019 9:29 am
It is always possible to calculate. You just need to precisely measure diameter and depths of the dish and then enter data in some of the calculators, like this https://www.satellite-calculations.com/ ... lector.htm
Make sure feed is pointed to the center of the dish. Also move feed closer/further and observe when signal lever gets maximum.
- Posts: 315
- Joined: Wed Jan 06, 2016 9:46 am
As above, measure and calculate. I was able to 'prove' by using the sun and putting a small piece of paper to 'see' the focused sun - but my dish is clean alloy - no paint. You can also use your hand......with care if its a big dish - mine is 66 cms and it gets hot!