Which rig likely to generate TVI/RFI

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eHam.net Forum : RFI : Which rig likely to generate TVI/RFI

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Which rig likely to generate TVI/RFI	Reply
by KA2JIZ on February 10, 2006	Mail this to a friend!
Posted this earlier but didn't get on the forum. I'd like to know which type of transcever (transmitter) is more likely to be the sourse of RFI/TVI...an older tube final rig or a fully transistorized rig. It is a given that they are both up to specs and properly tuned. Perhaps the question should also be, is, percentage-wise, most RFI/TVI generated by the transmitter. Or are the other "usual suspects" more likely the cause.

RE: Which rig likely to generate TVI/RFI	Reply
by KA2JIZ on February 10, 2006	Mail this to a friend!
Yes, the transmitter is the signal source, hihi.

RE: Which rig likely to generate TVI/RFI	Reply
by WB2WIK on February 10, 2006	Mail this to a friend!
The transmitter is the signal source, but a shielded transmitter into a shielded dummy load doesn't radiate any interference. Usually, RFI/TVI is due to intended radiation from your antenna influencing other equipment that is susceptible to interference due to poor immunity; as such, it doesn't matter whether the "source" of the RF energy is a tube transmitter or a solid-state one. How well shielded a transmitter is might have some small influence on interference to appliances that are located very close to the transmitter itself; but the vast majority of interference is from antenna radiation, not "chassis" or "rig" radiation. Some really old boat anchor transmitters were notorious for generating excessive RFI/TVI because they were poorly designed -- in some cases, designed before anybody had televisions! But I doubt you're thinking in terms of gear quite that old. WB2WIK/6

RE: Which rig likely to generate TVI/RFI	Reply
by KB9CRY on February 15, 2006	Mail this to a friend!
The answer is both. Both types of rigs (tube or solid state) can cause RFI if they are not operated properly or are operated into a poorly designed system (antennas, feed, grounding) or are operated near devices prone to receiving HF signals and being affected by them. So it's not the rig nor the type of rig that causes more or less RFI. It is all the other "usual suspects". Hope this helps. Phil

RE: Which rig likely to generate TVI/RFI	Reply
by WB6BYU on February 21, 2006	Mail this to a friend!
Most interference problems these days are due to fundamental overload of consumer electronic equipment. It has nothing to do with the transmitter, except the fact that it is transmitting as it was intended to do. It has nothing to do with the antenna, except that an antenna closer to the consumer equipment will subject it to a stronger RF field. Some transmitters, or poorly-balanced antennas, may cause RF flowing down the power cords and through the building electrical system, but this is difficult to predict because it depends on a lot of factors. Some of the older equipment radiated harmonics that would end up on TV channels or other receivers: in this case, the transmitter was at fault, and adding a filter on the output of the transmitter would reduce the problem. But most transmitters built in the last 30 years are pretty clean. So most RFI is now due to consumer equpment that is not designed to handle the RF fields generated by a properly-working transmitter. This is the fault of the consumer electronic equipment, not the transmitter.

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