any idea what this signal is?
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lwvmobile
DSD-FME
Wifi?
Edit: Nope, nevermind, read that wrong lol.
Edit: Nope, nevermind, read that wrong lol.
tvengr
Well Known Member
From FCC spectrum chart:
2700-2900 METEOROLOGICAL AIDS AERONAUTICAL RADIONAVIGATION 5.337 US18 Radiolocation G2
2.7-2.9 GHZ That band is used by radar for tracking aircraft. If the antenna makes a 360 degree sweep, that would explain why it comes and goes.
2700-2900 METEOROLOGICAL AIDS AERONAUTICAL RADIONAVIGATION 5.337 US18 Radiolocation G2
2.7-2.9 GHZ That band is used by radar for tracking aircraft. If the antenna makes a 360 degree sweep, that would explain why it comes and goes.
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Hmmm.. I'm hearing a burbling noise at that frequency.. (14:40 UTC).
Not sure if it's actually a transmitted signal, or a birdie caused by something running here in the shack.. I usually write this stuff off as the latter.. I wonder if others hear it.
Edit.. Just looked up the frequency and it's within the International maritime mobile distress and calling assignment (2173.5 KHz to 2190.5 KHz)..
Not sure if it's actually a transmitted signal, or a birdie caused by something running here in the shack.. I usually write this stuff off as the latter.. I wonder if others hear it.
Edit.. Just looked up the frequency and it's within the International maritime mobile distress and calling assignment (2173.5 KHz to 2190.5 KHz)..
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tvengr
Well Known Member
Didn't notice it was megahertz. I remember the marine calling frequency was 2182 KHz. This may be of interest: Federal Register :: Termination of Radiotelephone Medium Frequency 2182 kHz Watchkeeping, 2187.5 kHz Digital Selective Calling Channel Guard, and 2670 kHz Broadcasts
So, I plugged the frequency into my TH-D74 hand held radio.. The signal was loud just using the built in ferrite antenna which indicated that it was local. Then I walked around the house to see if I could find the source of the signal. Turns out that it's coming from my home video system.
I have a Lorex 4K network video recorder connected to 8 cameras.. If I shut off the recorder, the signal goes away.. In my case it's a birdie..
I have a Lorex 4K network video recorder connected to 8 cameras.. If I shut off the recorder, the signal goes away.. In my case it's a birdie..
Unwanted local birdies can be hard to track down. One way to be pretty sure it is local is to note the strength.
If the signal is always there day and night at about the same strength, then it most likely is something local. Signals down at 2.816 MHz will change depending on the time of day. (Those frequencies generally come in better at night).
If the signal is always there day and night at about the same strength, then it most likely is something local. Signals down at 2.816 MHz will change depending on the time of day. (Those frequencies generally come in better at night).
Token
Member
If it is a result of your computer monitor (and it might be), you can tell by turning the monitor off. Of course, you are using an SDR, and you need the computer on to run the SDR, but you do not need the monitor. Turn the monitor off for 5 seconds and then turn it back on, look at the waterfall to see if the signal went away during the time the monitor was off. It helps if you have the ability to slow down the waterfall so that it shows say 30+ seconds of time in the vertical scale.
Also, an audio recording would really help to ID this signal. Preferably in USB, tuned so that the signal is centered, and then tuned off 1 kHz or so low. In general the information that is desirable to help ID is a screen shot, an audio recording, and information on the settings when the audio recording was made (time (UTC), date (UTC), tuned frequency, receiver mode, and general region the receiver is in).
T!
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