C-Band Downlink Interference
C-Band Downlink Interference
(OP)
East coast C-Band downlink earth terminals have been experiencing periodic interference. The origin is unknown, possibly AWACS. Bandpass Filters have been intstalled between the recieve port of the feed and the LNB however, interference is still finding its way into the system. Has anyone out there identified the source of this interference of which I speak? If so what steps have you taken to eleviate it?





RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
I live in Miami, very close to the sea. And I has been living with interference for the past 2 years but being a big procastinator I leave that job for " tomorrow" and never try to fix the situation.
Finally after 2 years I decided to spend a weekend doing something that could work, and this is what I did with mix results:
I surrounded my C band antenna ( 10 feet) with mesh wire ( the one used for Screen doors, Storage bins and Small animal pets using 23 gauge) and I bougth this from my local Home Depot store and I attenuated in some grade this interference that is coming from all places ( all satellites are affected) and al Digital channels ( MPEG and Digicipher).
I don't have that problem in KU band. Only in C band.
I have Spectrum Analyzers ( 2 diferent units) but I don't try this step because I tough that with the mesh I could get rid of the interference and I was wrong.
After testing Saturday I reach a point where the interference was eliminated at least 70% but again Sunday night started in the same usual patern ( I get the interference every 10 seconds measured with a Chronometer).
My antenna now is " surounded" in the edge( al around the main ring where the antenna mesh is attached) by 24 inches high chicken wire covering all the external ring and the interference still there.....Not to strong like before..but still bothering me.
The only satelites where I have less problems are the Atlantic ones after Panamsat 1. NSS 806 is the one where the interference is smaller but when I come west....interference is all over again..not with the strenght before installing the mesh but still there.
Any Ideas?
Lionel Remigio
lremigio@commsearch.com
RE: C-Band Downlink Interference
It's primary mission is to eliminate out of band radar & altimeter interference.
RE: C-Band Downlink Interference
I ordered one of these filters today.
Your experience with the 7892 D is really good? And what means the letter D? There are many models for the 7892?
I have lots of people ( customers) in Latin American countries with the same interference problems and this filter can be a great siolution.
It works for you or you ? No more interference or less?
Thanks
Lionel
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
RE: C-Band Downlink Interference
caused by the awacs patrols along the us coast.
the microwave filter part mentioned in some of
your posts, is the correct solution. if the plane
is extreeeeemly close to you. some of the radar
pulse might get through. the 10 sec. period is
the rotation period of the radome on the awacs
plane. this radar was never intended to be used
towards US soil for extended periods of time.
God Bless America !
RE: C-Band Downlink Interference