CB radio cause interference?
#1
Thread Starter
CB radio cause interference?
Hello Again! I was recently flying at a local uncontrolled airport (with permission of course) where others have been known to fly and ran into an interference problem. I have a JR sx600 with the slimline 700 receiver on freq. 29. I performed the range check before flying and everything checked out fine, 30 paces away or so. While I was on climb out I noticed that the airplane tried nosing down pretty hard twice in a row and I was able to override it. I landed uneventfully and performed another check on the ground and then noticed the elevator was making full nose down deflections every now and then. With the new interference the only thing I noticed that had changed was some farmers cutting milo and more than likely using CB radios within 300 feet from me. Would this cause the interference? I was 30 miles away from the closest sanctioned airfield and the only other thing was a power plant about 10 miles away. I have no idea what could have caused it and I'm hoping somebody might know.
Other information: The plane had about 6 flights since being charged (about 25 minutes worth of flying) and don't know if this could have caused the problem (not sure how long they can go). Checked out fine at my house with no inadvertant control surface movements.
Other information: The plane had about 6 flights since being charged (about 25 minutes worth of flying) and don't know if this could have caused the problem (not sure how long they can go). Checked out fine at my house with no inadvertant control surface movements.
#3
Thread Starter
RE: CB radio cause interference?
I am not sure what to think about the cracked tx board. I'm hoping that isn't the problem. I have visually inspected the case and there is no signs of damage at all and I have always been extremely careful when handling it. I have tested the radio at my house two seperate times (5 min each) and have not duplicated the problem. "FLYBOY"...when your friends had problems in the past with the tx boards was the problem at least consistent or noticeable, or can that only be found by sending the unit off?
#4
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RE: CB radio cause interference?
why not get a freq checker they're pretty cheap...cheaper than the pain it would be to remove your receiver and send in for repair..go to the site where you were flying at with your airplane. keep your airplane on the ground, if you get a glitch check the freq checker to see if your getting interference...if you are, fly somewhere else, if not looks like you wil have to send in the transmitter and receiver.
Batteries were fully charged that night before you flew weren't they?
Batteries were fully charged that night before you flew weren't they?
#6
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RE: CB radio cause interference?
I would disagree on the CB "wouldn't do it". The CB normally wouldn't do it, but around here we have plenty of rednecks pumping serious power out of thier CB with an amplifier.
My buddy Allen, can do some pretty interesting things with electronics using his CB...... not to mention he washes his truck for free at the coin operated car wash.
My buddy Allen, can do some pretty interesting things with electronics using his CB...... not to mention he washes his truck for free at the coin operated car wash.
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RE: CB radio cause interference?
always charge your batteries before each flight day....I charge 15 to 17 hrs with a wall wart, or do a quick charge at the field before every flight day.....
#9
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RE: CB radio cause interference?
I would disagree on the CB "wouldn't do it". The CB normally wouldn't do it, but around here we have plenty of rednecks pumping serious power out of thier CB with an amplifier.
#10
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RE: CB radio cause interference?
ORIGINAL: Lomcevak Duck
Citizen band radios still operate on 27 MHz while we fly on 72 MHz no matter what the signal strength. The only way a CB could affect the 72 MHz band is by changing frequencies, not just increasing output power.
I would disagree on the CB "wouldn't do it". The CB normally wouldn't do it, but around here we have plenty of rednecks pumping serious power out of thier CB with an amplifier.
It would not be uncommon for a mobile unit to have almost the same effect using as little as 200 or 350 watts simply because there is no earth ground and an omnidirectional antenna. I used to go out to the lake in my car, clip a set of jumper cables to the bumper and throw the other end in the water or hook them to a set of guard rails, and had no problem with bleedover.
Another thing you have to look at is that on a lot of smaller mobile antennas (1/4 wave, 1/2 wave), as the power increases, and as the coax heats and cools, the SWR calibration changes. An untuned or improperly tuned antenna will also cause bleedover.
Yes, my friend, bleedover is alive and well, and there's probably nothing you can do about it. A guy once told me that the only way to really idiotproof something was to get rid of the idiots... You're probably going to have to find another place to fly.
#11
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RE: CB radio cause interference?
Yes, 27 MHz signals can interfer with 72 MHz if the relative signal strength is great enough. What happens is that there is enough RF energy picked up by the 72MHz receiver to saturate the AGC/noise filters and reduce the gain to marginal levels. It does take a great deal of difference in power levels but it can and does happen.
#14
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RE: CB radio cause interference?
with enough power you can interfear with cell phones I know had it happen to me driving down the highway I was a trucker I heard his conversation on my phone and I also was that guy with an linear amp on my cb I cold talk at least 12 miles on plains ( line of site ) in the hills a diffrent story so yes a cb radio with an amp can cause problems.