Personal weather stations & RFI

It’s hotter than the hinges on hell’s front door lately but it didn’t get anywhere near 128F today, nor did we dip down to -16.5F last night.

The other readings are pretty accurate – including the time stamps on the questionable readings which reveal their cause – RFI.

My old Davis unit suffered the same problem on 40 meters even at QRP levels. The new unit seems to throw its tantrums only when I’m on 10, 12 or 15 meters. In other words, on the bands that are open now…

The solution is to disable the weather station when I’m on the air; otherwise, false highs and lows get saved as valid data, negating the reason I bought the thing to begin with. The location of the indoor console and its associated computer is 15 feet from the K3 et al – ferrite suppressors on the USB cable offer no relief as I believe the RF is going directly into the console and causing it to generate the false readings which then get reported to the computer and on to the internet (APRS and

It’s kind of bizarre that only the weather station is affected by RF with everything else around here that could be but isn’t: modem, router, wireless mouse, etc – are all immune even to kilowatt levels of RF, yet neither weather station (this one or the old Davis)¬†could handle as little as 5 watts.

Maybe an RF-hardened weather station would make an ideal kit for Heath’s reintroduction to the field. I don’t need a garage assistant (whatever that is) or a pool monitor…




  4 comments for “Personal weather stations & RFI

  1. October 4, 2011 at 7:42 am

    Hi John, I have a similar problem. Only the rain gauge is affected on my La Crosse weather station – but even a few watts of HF and we get a lot of rain recorded!

    • October 4, 2011 at 11:27 am

      Tim, I’d exchange your rain problem for my temperature problem if I could. We haven’t had any rain here in so long that I’d even be willing to welcome your imaginary rain!

  2. Peter W2IRT
    August 15, 2012 at 8:53 pm

    Same problem here. I’m using a Davis Vantage Pro 2 cabled version and the instant I key up on 20 with the amp running full the whole thing crashes, requiring a PC reboot and a Vantage console reboot. I just lost a month’s worth of data this afternoon trying for D64K with all the hamsters spinning in the amp. I’m a hard-core DXer and contester and shutting off the weather station isn’t an option for me.

    • August 15, 2012 at 9:00 pm

      I was disappointed at how low the power levels could be and still cause a proble. Now with a kw myself, a wx station is no longer an option.

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