Welcome to the FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
Need the latest SmartSDR or 4O3A Genius Product Software?


SmartSDR v4.0.1 and the SmartSDR v4.0.1 Release Notes

SmartSDR v3.10.15 and the SmartSDR v3.10.15 Release Notes

The latest 4O3A Genius Product Software and Firmware
If you are having a problem, please refer to the product documentation or check the Help Center for known solutions.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.

Interference Across the Spectrum

Craig Gagner
Craig Gagner Member ✭✭
in FLEX-6000 Signature Series

Hi Flex Community,


Have any of you an idea what the signal occurring as three stripes in the waterfall repeating across the 40 meter band in the screen shot below might be? It occurs intermittently across much of the HF spectrum at times. Thanks and 73, w7phg.

flex Capture.JPG


Comments

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    Hi Craig, well that could be any of a number of things. Usually, you want to verify that it is not originating from your shack. Unplug everything possible to see if it goes away. TV sets, wall warts, washing machines are all good candidates.

    If your whole house comes up clean, then it is likely something at a close neighbor's house. A portable SDR receiver can help track down the location.

  • Ha Gei
    Ha Gei Member ✭✭✭

    I see similar signs , but more on higher bands, If they , demodulated in AM sound like hum, the are harmonics of power supplies or inverters. If the are corelated to shini9ng sun, look for solar power supplies


    DL9NDW

  • John KB4DU
    John KB4DU Member ✭✭✭✭

    The way the frequency wobbles around, this is most likely a switching type power supply of some sort. For me the first step was to operate with only battery power, ups for the flex and laptop computer. Cut the main breaker and see what happens. If the noise goes away,it’s something in the house, so turn on the main and turn off breakers one at a time. Mine was a wireless external speaker charging by usb. If the noise persists, it could be external, but sometimes in the house by a device that has a “keep alive” battery, which can be a challenge to locate.

  • Mike Steventon
    Mike Steventon Member ✭✭✭

    Here in the UK we get a lot of grief from Very High Speed Digital Subscriber Line (VDSL) internet connections via wire to property, which reveals itself as sharp and major spikes on the 40m band, at 4kHz intervals. It MIGHT be to do with internet, or as the other replies suggest, switched-mode power supplies nearby?

    Mike. G4GWH

  • jim
    jim Member ✭✭

    My washing machine will do that and also a wireless phone charger makes a lot of noise broadband.

Leave a Comment

Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.

Comment As ...

Categories