[amsat-bb] Re: Dutch Transponder on-baord HAMSAT VO-52 'Turned On'

[PE0SAT]

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


-- 
With regards PE0SAT
Internet web-page http://www.pe0sat.vgnet.nl/