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Thread: Broad spectrum interference - FR24 box

  1. #1
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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. #2
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    Quote 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

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

  4. #4
    Purser
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    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-LFMN3
    P-ESGR, P-ESIA, P-ESIB, P-ESGF

  5. #5
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    Quote 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.

  6. #6
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    Quote 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

  7. #7
    Captain Anmer's Avatar
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    Quote 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

  8. #8
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    Quote 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

  9. #9
    First officer
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    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.

  10. #10
    Flight attendant
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    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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