Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [rfi]

Use this tag for questions regarding RFI (Radio Frequency Interference).

152 questions
36
votes
14 answers

Can my neighbor's ham radio antenna be interfering with my internet signal or is my internet provider just throwing blame elsewhere?

My internet provider is telling me that an antenna on my neighbor's house, which he called a ham radio antenna, is interfering with my DSL internet signal. I'm not tech savvy at all, beyond what's necessary to function in today's world, so I'm…
Vanessa
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11
votes
3 answers

How can I get rid of RFI coming from my house solar panel inverter?

The solar system on my house creates horrible rfi on all hf bands during the day when the sun is out, it goes away when it's not sunny. Any one got any ideas how to get rid of the rfi ? I already tried putting capacitors across the high voltage…
Andrew
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6
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2 answers

Do ethernet-over-power adapters interfere with radios?

I remember not long ago seeing a lot of chatter in the ham community about large-scale "Broadband over Powerline" (BPL) systems causing harmful interference across several bands. Does similar interference happen with SOHO "Ethernet over Power"…
KJ4JTN
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4
votes
6 answers

Cordless phone consistently experiencing RFI

I've tried several cordless phones (most recently KX-TG570), and all seem to frequently pick up terrible RF interference. I have a neighbor that is a ham enthusiast, with large antenna masts on the first rooftop, and it does seem to coincide with…
g g
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4
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0 answers

The whole neighborhood's internet drops when I transmit on 40M

I recently built a vertical. It's 6M radiator, a coil, and 1.2M more of radiator. It sits on my roof, which is metal, and acts as a ground plane (GND from the feedline is connected to it). There is a choke right at the feedpoint. The impedance is…
hjf
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3
votes
1 answer

Steps for eliminating RF interference

I built a little USB dongle I put on my radio. This dongle interfaces audio and PTT to my radio so it can use AllStar link. The problem is interference. When the radio transmits, I heard a high pitch squeal as well as a lower frequency hum that is…
Skyler 440
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3
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1 answer

Why does RFI demodulate to a buzz sound?

For RFI problems with audio equipment, why does a dead carrier often demodulate to the familiar mains 60 Hz buzz sound? This occurs on multiple audio equipment around the house. There are lots of references to RFI buzz sounds, and I understand how…
multicode
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3
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2 answers

What kind of RFI is this?

I'm getting a lot of noise now that I have a dipole higher up. The pattern on the waterfall makes it seem man made. Could it be power line? Or is it some kind of motor? Here's a short video of the display and waterfall:…
Paul
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3
votes
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Method to generate PIM

I would like to have a go at measuring PIM. ( Passive Intermodulation ) in UHF. To test my ability to measure PIM, I need to find something that generates PIM. I either envision a 50Ω device that generates PIM, or a 2-port thru device which can be…
Skyler 440
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3
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2 answers

Can jamming a channel with white noise be detected?

If somebody were to setup a pirate radio signal that was broadcasting static would the people tuned in to that frequency be able to tell? Assuming that there was nothing already on that frequency what kind of equipment would one need to be able to…
user2193122
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3 answers

What does it mean to have "RF in your signal"?

I've been told that I have "RF in my signal". What does this mean? What are some potential causes of having RF in the signal?
Jerry
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2
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3 answers

Can you jam jam?

Is it possible to jam the jammer signal, to disrupt its jamming of the owned RF signal?
William Roy
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2
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2 answers

RFI every 24 kHz from 2.7 MHz to about 5 MHz

Quite recently, a significant noise source has shown up on my HF radio - it is NOT from my property as I have turned off the main breaker to the house - completely NO power - and still observe it on my battery-operated receiver. The noise is about…
Raydeeoh
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2
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1 answer

What would cause this RF noise pattern? (Hum with associated "flapping" and beeping)

In quite a lot of places below 7000kHz I see a repeated noise figure. A hum, then about 12kHz above it a "flapping" with beeping noise, and then about 50kHz from that whistling with three clearly-defined spectral spikes. Here's a link that shows…
QuantumMechanic
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2
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0 answers

Any good RF noise "libraries" out there?

Are there any good/useful "libraries" of RF noise out there? I know about http://www.arrl.org/sounds-of-rfi but it is pretty limited. (And I wish the screencaps showed the FFT rather than a time-domain snapshot). I'd love to know what some of the…
QuantumMechanic
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