On Feb 8, 2011, at 6:59 AM, Denys Fedoryshchenko wrote: > On Tuesday 08 February 2011 01:42:42 George Herbert wrote: >> On Mon, Feb 7, 2011 at 2:23 PM, Ryan Wilkins <r...@deadfrog.net> wrote: >>> On Feb 7, 2011, at 4:06 PM, Michael Painter wrote: >>>> Hi Denys >>>> I doubt it's intentional jamming since I've had the same problem. >>>> Aegis radar is very high power in full radiate mode and as such creates >>>> problems for Low Noise Amplifiers listening at 3.4-4.2 GHz. Someone >>>> needs to talk to Microwave Filter Company. >>>> http://www.microwavefilter.com/c-band_radar_elimination.htm >>>> >>>> --Michael >>> >>> +1 for Microwave Filter. They've helped me out in a couples jams before. >>> They're very responsive and the products are good, too. >> >> I think people in San Diego and near Norfolk, VA have the same problems. >> >> The C-band frequencies are 2x those of the S-band (4-8 GHz for C, 2-4 >> GHz for S); if the SPY-1 / SPY-1D radar is frequency hopping it may >> well step on someone's C-band links at twice the radar's basic >> frequency. Just need a filter to remove actual S-band frequencies >> from C-band feeds. > I try to install C-Band bandpass filter, no effect at all, so it is in-band > interference. Putting foil (yes i try almost everything) near LNB doesn't > affect interference level too. >
It can come in from other places as well. Inductance via unfiltered/poorly-filtered power, poor I/F cabling as well as via other sources. Have you tried using a spectrum analyzer to characterize the signal in the ether and compare it to what you are seeing in your systems? Tom
