I recently modified my BSC-621 since I felt lke it had less than stellar KU performance. I tuned and tuned my 10 foot dish using a pansat 9200 HD FTA receiver.
I always had a theory that the internal scalar ring on the ku lnbf was creating too much signal rejection. C band was good but ku never seemed great. I checked dish alignment, skew, focal point , etc.
I looked down the lnbf to make sure that ku was lined up with the c-band H and V probes. That checked out good.
Here is what I did:
I used aluminum foil duct tape to neatly cover the internal ku scalar ring located in the bottom of the feedhorn. I used an exacto knife to cut out the center hole so the ku signal could get into the ku portion of the lnbf.
I neatly trimmed it on the edges. No foil tape can hang over the edges because that scalar is a tight fit into the c-band lnbf part of the unit.
After re- assembly I tuned the lnbf and KU was much improved.
From a scientific standpoint this MAY have helped or maybe I just got it all better aligned. I am not for sure but I have great KU band signals now.
That foil tape may be a problem when the weather gets hot, since this is an experiment I will have to think of a permanent solution later.
I always had a theory that the internal scalar ring on the ku lnbf was creating too much signal rejection. C band was good but ku never seemed great. I checked dish alignment, skew, focal point , etc.
I looked down the lnbf to make sure that ku was lined up with the c-band H and V probes. That checked out good.
Here is what I did:
I used aluminum foil duct tape to neatly cover the internal ku scalar ring located in the bottom of the feedhorn. I used an exacto knife to cut out the center hole so the ku signal could get into the ku portion of the lnbf.
I neatly trimmed it on the edges. No foil tape can hang over the edges because that scalar is a tight fit into the c-band lnbf part of the unit.
After re- assembly I tuned the lnbf and KU was much improved.
From a scientific standpoint this MAY have helped or maybe I just got it all better aligned. I am not for sure but I have great KU band signals now.
That foil tape may be a problem when the weather gets hot, since this is an experiment I will have to think of a permanent solution later.