[Spooks] IF Jamming SSW of NOLA?
Visit http://mailman.qth.net/mailman/listinfo/spooks to unsubscribe from this list Have there been reports of IF (intermediate frequency) jamming south-southwest of New Orleans? __ Click here to donate to the Hurricane Katrina relief effort. http://store.yahoo.com/redcross-donate3/ __ Spooks mailing list Home: http://mailman.qth.net/mailman/listinfo/spooks Help: http://mailman.qth.net/faq.htm Post: mailto:Spooks@mailman.qth.net - Visit http://www.spynumbers.com/ for complete information about Spy Numbers Stations
Re: [Spooks] IF Jamming SSW of NOLA?
Visit http://mailman.qth.net/mailman/listinfo/spooks to unsubscribe from this list What is I.F. jamming? If it is a carrier on the IF of some radios, for example 10.7 MHz, it's not too effective. A lab I worked with experiemented with this using cheap FM receivers for the test and found 100 W was only effective a few feet, at some 50 feet, the desired signal plus the "jamming signal" came through equally and there was no effect at about 200 feet. Kurt Rosetta Proving Ground, Nevada Hell's Laboratory __ Spooks mailing list Home: http://mailman.qth.net/mailman/listinfo/spooks Help: http://mailman.qth.net/faq.htm Post: mailto:Spooks@mailman.qth.net - Visit http://www.spynumbers.com/ for complete information about Spy Numbers Stations
Re: [Spooks] IF Jamming SSW of NOLA?
Visit http://mailman.qth.net/mailman/listinfo/spooks to unsubscribe from this list Hi Kurt: What if there were two jamming carriers where they both were in the passband of the RF front end and separated by the IF frequency. Neither one needs to be the station the radio is tuned to. For example a radio listening to 106 MHz and jamming signals on 90 MHz and the other on 100.7 MHz? Any non linearity in the RF processing would generate the IF frequency. 73, Brooke Clarke, N6GCE -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com KD7JYK, 49H7KR wrote: Visit http://mailman.qth.net/mailman/listinfo/spooks to unsubscribe from this list What is I.F. jamming? If it is a carrier on the IF of some radios, for example 10.7 MHz, it's not too effective. A lab I worked with experiemented with this using cheap FM receivers for the test and found 100 W was only effective a few feet, at some 50 feet, the desired signal plus the "jamming signal" came through equally and there was no effect at about 200 feet. Kurt Rosetta Proving Ground, Nevada Hell's Laboratory __ Spooks mailing list Home: http://mailman.qth.net/mailman/listinfo/spooks Help: http://mailman.qth.net/faq.htm Post: mailto:Spooks@mailman.qth.net - Visit http://www.spynumbers.com/ for complete information about Spy Numbers Stations
Re: [Spooks] IF Jamming SSW of NOLA?
Visit http://mailman.qth.net/mailman/listinfo/spooks to unsubscribe from this list >Have there been reports of IF (intermediate frequency) jamming south-southwest of New Orleans? Someone involved with the HF ham radio relief effort reported a strong transmitter on 455 kHz blocking their receiver. I can't get any further information, despite asking around. I certainly cannot determine whether or not there is any factual basis to any of this. Most FM radios with 10.7 IFs are dual conversion with a second IF at 455. -hugh __ Spooks mailing list Home: http://mailman.qth.net/mailman/listinfo/spooks Help: http://mailman.qth.net/faq.htm Post: mailto:Spooks@mailman.qth.net - Visit http://www.spynumbers.com/ for complete information about Spy Numbers Stations
Re: [Spooks] IF Jamming SSW of NOLA?
Visit http://mailman.qth.net/mailman/listinfo/spooks to unsubscribe from this list Hi Hugh: Most FM broadcast radios only have a 10.7 MHz IF since the signal is 0.2 MHz wide. Many HF radios use both 10.7 and 455 kHz IF stages, but the bandwidth of any 455 IF is less than about 16 kHz. Have Fun, Brooke Clarke, N6GCE -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Utility World (Hugh Stegman) wrote: Visit http://mailman.qth.net/mailman/listinfo/spooks to unsubscribe from this list Have there been reports of IF (intermediate frequency) jamming south-southwest of New Orleans? Someone involved with the HF ham radio relief effort reported a strong transmitter on 455 kHz blocking their receiver. I can't get any further information, despite asking around. I certainly cannot determine whether or not there is any factual basis to any of this. Most FM radios with 10.7 IFs are dual conversion with a second IF at 455. -hugh __ Spooks mailing list Home: http://mailman.qth.net/mailman/listinfo/spooks Help: http://mailman.qth.net/faq.htm Post: mailto:Spooks@mailman.qth.net - Visit http://www.spynumbers.com/ for complete information about Spy Numbers Stations
