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Broad spectrum interference - FR24 box

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  • Broad spectrum interference - FR24 box

    Anyone else have interference problems with RF radiation from the FR24 ADS-B base unit?

    It was the first time I had powered up my VHF systems since the unit was delivered and powered up and initially I had a lot of data carrying RF interference around the 70 and 145Mhz band. Pulling the power from the FR24 unit stopped all noise. As a quick 'fix' I have fitted about 20 turns of the PSU cable around a ferrite rod which has reduced the noise but it is still there so the unit/antenna must be radiating.

    Paul
    Radar code - F-EGFH1 Locator square IO81BW GPS Position: 51.9459,-3.9112 70.0m

  • #2
    Originally posted by Marlin.45 View Post
    Anyone else have interference problems with RF radiation from the FR24 ADS-B base unit?

    It was the first time I had powered up my VHF systems since the unit was delivered and powered up and initially I had a lot of data carrying RF interference around the 70 and 145Mhz band. Pulling the power from the FR24 unit stopped all noise. As a quick 'fix' I have fitted about 20 turns of the PSU cable around a ferrite rod which has reduced the noise but it is still there so the unit/antenna must be radiating.

    Paul
    Has no one else never noticed this problem or is this only the unit I have, maybe?
    Radar code - F-EGFH1 Locator square IO81BW GPS Position: 51.9459,-3.9112 70.0m

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    • #3
      Have you tried another PSU to confirm if its the switch mode PSU or the box itself?

      Comment


      • #4
        Had problems on one site, but it was the PSU that was causing interference when under load.

        /M
        F-ESDF1, F-ESGG1, F-ESGP1, F-ESNK1, F-ESNV2, F-ESNV3 F-ESSL4, F-ESNZ7, F-LFMN3
        T-ESNL1, T-ESNL2, T-ESGR15
        P-ESIA, P-ESIB, P-ESGF, P-ESSN, P-EFMA
        mrmac (a) fastest.cc

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        • #5
          Originally posted by MrMac View Post
          Had problems on one site, but it was the PSU that was causing interference when under load.

          /M
          Yes, pretty much what I was alluding to. Many of these PSUs are built for not much more than a few cents.

          Comment


          • #6
            Originally posted by Stealth View Post
            Yes, pretty much what I was alluding to. Many of these PSUs are built for not much more than a few cents.
            Yep the problem is either when the PSU is under load or radiation from the FR ADS unit. I think the former as the ferrite choke has reduced the problem on the 144mhz band.

            I will contact FR24 and see what they recommend. Invoice states the PSU value at 3 Euro so..... I will also look in my junk box and see whether I have a suitable replacement to try?
            Radar code - F-EGFH1 Locator square IO81BW GPS Position: 51.9459,-3.9112 70.0m

            Comment


            • #7
              Originally posted by Marlin.45 View Post
              I will contact FR24 and see what they recommend.
              Is the FR24 receiver from Germany or Sweden?

              The German device was using a BeagleBone board (round pin power connector) whereas the Swedish one looks to be using a Raspberry Pi (Micro USB B connector).

              Is the power adapter the original supplied by FR24? If you try an alternative, check the rating is the same - volts and amps.
              Mike


              www.radarspotting.com

              Radarspotting since 2005

              Comment


              • #8
                Originally posted by Anmer View Post
                Is the FR24 receiver from Germany or Sweden?

                The German device was using a BeagleBone board (round pin power connector) whereas the Swedish one looks to be using a Raspberry Pi (Micro USB B connector).

                Is the power adapter the original supplied by FR24? If you try an alternative, check the rating is the same - volts and amps.
                Hi Anmer, The rx is from Sweden. I haven't had a chance to try an alternative PSU (I have been away for several weeks) yet.
                Radar code - F-EGFH1 Locator square IO81BW GPS Position: 51.9459,-3.9112 70.0m

                Comment


                • #9
                  My cause on HF was the power supply, i simply replaced it:

                  FR24 receiver turned on:


                  FR24 receiver turned off:


                  Long story short, always check the power supply first.

                  To keep my bands clean, i had to:
                  - Replace my modem PSU
                  - Replace my loop antenna PSU
                  - Replace my FR24 PSU
                  - Get rid of a Mikrotik wifi device
                  - Get better USB cables (not required for FR24)

                  And still not all QRM has gone. But my spectrum 10 kHz to 1800 MHz is free of big QRM sources.

                  Comment


                  • #10
                    It pays to look at any switch mode PSU. For example, Panasonic produced some awful ones in their TV sets that caused interference across a very wide band. I gave away one TV due to it.

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