Interference & wireless

dag_on_a_bike
dag_on_a_bike Posts: 581
edited October 2007 in Workshop
My current computer (a Lidl special) often returns speeds of 76mph, especially when stationary at lights or random speeds past power lines. The HRM function likewise shows a reading, often as high as 240bpm even if I don't have the HRM belt on.

Clearly the induction loops at the traffic lights and power cables are causing interference.

Can anyone suggest a wireless computer (with or without HRM) that is less prone to interference?
There's no such thing as too old.

Comments

  • simmo3801
    simmo3801 Posts: 486
    When I was in france recently on a charity ride I returned max speeds of 67 mph on my Polar S520 HRM and wondered what was wrong with it. Now I know thanks.
    Giant Anthem X3 2013
  • Monty Dog
    Monty Dog Posts: 20,614
    There are no some digital wireless computers less prone to interference - including from your own bike lights. However, even some high-powered signals can interfere with these signals.
    Make mine an Italian, with Campagnolo on the side..
  • dag_on_a_bike
    dag_on_a_bike Posts: 581
    Monty Dog wrote:
    There are no some digital wireless computers less prone to interference...

    Monty,

    Can you recall which?

    Thanks
    There's no such thing as too old.
  • fizz
    fizz Posts: 483
    I've got a Polar CS200 with the cadence sensor, I've never had a problem with interferance on it, but I dont tend to do alot of town / city ridnig, Most of mine is done on quiet country roads, so I dont ride over a lot of induction loops etc. So I dont know how it would perform in a more urban environment, but I am really pleased with it, its a top piece of kit IMHO.
  • ajohn9
    ajohn9 Posts: 260
    ive got a specialized wireless, never had any issues like this with it
  • john_wr
    john_wr Posts: 50
    Also have a Polar CS200CAD which has shown me riding with a heart rate of 245 bpm ( max is 174 in a ramp test ). This has happened on a number of occasions when riding in open countryside. I think the false reading may have been caused by electronic systems in overtaking cars ( sat nav ) or riding near a powerful RAF radar station. The speed function remains accurate though.

    Without wishing to open my mouth, the following actions do seem to have "cured" the problem. I have reduced my own radio footprint by making sure my mobile phone is always turned off and I thoroughly soak the chest strap contact pads under a running tap before wearing it.

    Sorry this is not related to measurement of speed, but is still relevant to any wireless device.

    John.

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