interfrence - MobileHam Forum at eHam.net

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eHam.net Forum : MobileHam : interfrence

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interfrence	Reply
by KA7RRA on June 5, 2001	Mail this to a friend!
OK here is my promblem I monitor 147.540 simplex in the greater Seattle Evterett area. I used to have a 93 chevy suburban and now I have a 93 nissan minivan MY promblem is I keep getting interfrence on 147.540 and its the only 2mt freq I get it on. Its like somebody dumping a carrier on that freqencey ITS about 3-5 db on the S-meter I would get it on the FT5200 and on the FT8100 I just sold my FT-8100 and bought a IC2800H So I hope it well clear it up Any body have any Ideas on what it could be,and/or how to get rid of it thanks Dave...

RE: interfrence	Reply
by WB2WIK on June 5, 2001	Mail this to a friend!
Not much information to work with, here. Do you hear the same carrier if you take the rig out of the car and connect it to a different antenna? No signal on the air, on any frequency, anywhere, is always the same strength regardless of where you drive -- so I think you've left out some information. Is it S3 to S5 in some areas, and weaker in other areas, and stronger in other areas? Can you ever drive so far away from Seattle that the carrier disappears altogether? My first offhand guess is that maybe this is a frequency used by the local Cable TV service (they can use whatever frequencies they want to -- they're not "transmitting," at least not on purpose!), and the signal you hear is being carried by the Cable TV lines overhead. It's not unusual for the cable services to use channel frequencies in the two meter ham band -- again, they are allowed to, provided they don't interfere with other services. However, when this is the case, the received signal in the car will vary a lot as you drive around, and you should be able to drive right out of the area where the interference is. If the signal is a steady S3-S5 no matter where you drive, and it occurs in different receivers, that certainly is unusual! 73 de Steve WB2WIK/6

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