I saw from one of your below
replies, I copy here "I would like to tell you one
more thing that One vertical and one horizontal
TX has same TX frequency which is the lowest among
all and the vertical one is getting effected" So
I understand the problem is the MCPC carrier on
that vertical uplinking transponder.
call this transponder as XP V1.
If I were
you, I will do the followings.
1) Validate from
Spec An plot of vertial HPA Monitor port that you
are transmitting a desired MCPC carrier on XP V1
by tunnning whatever center frequency of XP V1.
; if you don't see the MCPC carrier on V-HPA, then
maybe some cabling is missing from your KU upconverter.
If you see the MCPC carrier on XP V1 from HPA sample
port, then go to 2.
2) Validate the proper
cross-pole isolation of Antenna B.
humble opinion), Antenna B doesn't seem to have
enough cross-pole isolation between V and H polarities.
The best way of doing this in your circumstnace
( assuming you have a good working antenna A) would
be to transmit a CW ( pure carrier) on vertical
( could also be horizontal) uplinking polarity from
Antenna B and monitor the CW downlink from Antenna
A's vertical and horizontal polarities. As you may
know, V- uplink should be monitored in H-downlink
as linear satellite coverts polarity of up and down
links. It means you have to see a bigger size of
CW carrier in H downlink of Antenna A if you are
uplinking CW in V pole from Antenna B. You will
need to compare H and V downlink fo antenna A in
order to determine a valid isolation. If considering
the size of antenna, 9M, I would recommend at least
27~30 dB of X-pole isolation, meaning CW C/N of
co-pole(H) downlink should be 27~30 dB higher than
that of X-pole( V) downlink.