On Fri, March 16, 2012 09:33, i8cvs wrote:
Hi,
BTW after working few orbits it seems to me that the indian transponder was less subject to be overloaded in comparison to the Dutch transponder.
If the EIRP is too high and there are many station in the passband the Dutch transponder is FMing and get distorted while the indian transponder was more linear and less subject to be overloaded.
If the uplink power is in the order of 10 to 20 watt into a 10 dBi RHCP antenna than the Dutch transponder is not overloaded.
I experience the same, last night during the pass from 7:22 p.m. UTC there was an overload on the uplink and therefor it was impossible to use the passband efficient. I also experienced linearity problems.
So please reduce power to a minimum - if the transponder is clogged no one benefits.
I agree with you that it will be very interesting to know from ISRO if the difference in linearity between the above transponders is due to the actual battery conditions or to a different performance of the AGC
73" de i8CVS Domenico
73 Jan PE0SAT