Pulsating Static?
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Senior User
Joined: Oct 2006
Posts: 483
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From: Spicewood, TX
Pulsating Static?
Hey guys (Moderator & Administrator, too) - I realize this is off-topic but I've had no responses from the generic radio forum - not too many diesel-types down there. Besides, I think it has a direct relationship to my '99 F-250 7.3 PSD.
Ever since I bought this truck (Jan '05), there has been a pulsating static on the AM side. The pulsating is at a rate of about 6 times/second. Only when I am really close to the station's transmitter - say 5 to 7 miles or so - is the static overcome by the signal strength of the station. The pulsating is constant - never changes in rate or pitch. Pulsating static stops when I turn off the engine.
Thought that if there was an external filter I'd check it out but I have no idea where to look.
Ideas?
Thanks in advance.
Ever since I bought this truck (Jan '05), there has been a pulsating static on the AM side. The pulsating is at a rate of about 6 times/second. Only when I am really close to the station's transmitter - say 5 to 7 miles or so - is the static overcome by the signal strength of the station. The pulsating is constant - never changes in rate or pitch. Pulsating static stops when I turn off the engine.
Thought that if there was an external filter I'd check it out but I have no idea where to look.
Ideas?
Thanks in advance.
Lead Driver
Joined: Dec 2003
Posts: 5,249
Likes: 42
AM is hard to dichiper. I get that a lot sometimes but it depends on the weather an traffic lights. Remember that AM is a strait wave unlike FM, so of course, the closer you are the better the reception. The only thing I know of to rectify the problem, is a bigger antenna, an inline amp for the antenna, or the kit that turns your truck frame into an antenna. That or get satellite.
Thread Starter
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Senior User
Joined: Oct 2006
Posts: 483
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From: Spicewood, TX
You're right about AM - can be anything and wnywhere, terrestrial or in the vehicle.
A member in the radio forum asked if I had an electric fuel pump. That's the only thing that seems to make sense at this point. At least it's a starting point. I'll start there.
Thanks.
A member in the radio forum asked if I had an electric fuel pump. That's the only thing that seems to make sense at this point. At least it's a starting point. I'll start there.
Thanks.
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
With a regular rate, I wonder if it isn't the data buss, with which the various black boxes communicate with each other, that's causing the noise to be heard in the AM radio band.
The data pulses are digital, meaning square waves, which have a fair amount of odd-harmonic noise generation, some of which may fall into the AM band. All it might take is an open shield ground. I'd hate to try to find it.
BTW, I've noticed the same thing, but only on the weaker AM'ers where the AGC is a little more "open". Maybe we all have it.
Pop
The data pulses are digital, meaning square waves, which have a fair amount of odd-harmonic noise generation, some of which may fall into the AM band. All it might take is an open shield ground. I'd hate to try to find it.
BTW, I've noticed the same thing, but only on the weaker AM'ers where the AGC is a little more "open". Maybe we all have it.
Pop
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