antenna radiation pattern - blind spot beneath?

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  • Updated 2 years ago
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Bridge doesn't see 5-in-1 sensor mounted 30 above in frame house.  It does see other sensors placed elsewhere in the home.  Has anyone run a radiation pattern on the 5-in-1's 430 MHz antenna?  Is there a blind spot underneath it? 
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SE Grafton

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Posted 2 years ago

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Photo of Rick


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Antenna design is kind of black magic.
In addition, the antenna in the bridge is far from ideal.

If you were to believe that it is a quarter wave monopole, the reception pattern should be similar to the top half of a sliced bagel.bdurectly above there is no reception, and theoretically none below the "horizon".

A quarter wave monopole, however, needs a ground plane to function properly, and this does not.

I dint extensive testing a month if so ago. Four sensors. All four orientations of the bridge with it upright, and repeated with it upside down.

I then tried to correlate all the data.

I found that for sensors even with,more above the bridge, reception was best from about 1:30 tom7:30 (viewing from the logo side, with antenna away from you).
For sensors below the bridge, I could nit find any correlation in the dat.

As you would expect, since they are in that missing lower half of the bagel, reception is poor.
The worst sensor is actually the closest. At about a 45 degree downward, 20 feet away.
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AcuRite Jennifer

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Hello SE Grafton,

If you are not getting an outdoor reading, we would recommend the hard reset steps below:

Perform a hard reset:

  1. Bring both the sensor and display unit indoors side by side.
  2. Remove batteries from the sensor.
  3. Remove batteries from the display unit and unplug the AC adapter (if applicable).
  4. Wait 1 minute to ensure any remaining battery power is discharged from both units. 
  5. Make sure the A-B-C ID code switch on both units match. 
    *Sometimes changing to a different ID code can help.
  6. Reinstall batteries in outdoor sensor first.
  7. Reinstall batteries in display unit second.
  8. Let the units sit within a couple feet of each other for 20 minutes to ensure a wireless signal is received. 
    * The display should receive the signal within several minutes. 
  9. After a connection has been established you may place the sensor outdoors.
    *If the signal connection fails after the units are separated try a new or different location for the display unit, the sensor or both.
If this does not correct the problem, please let us know. Enjoy your day!