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Re: BLE RSSI questions
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Re: BLE RSSI questions

  • Subject: Re: BLE RSSI questions
  • From: András Kövi <email@hidden>
  • Date: Tue, 26 Feb 2013 11:37:59 +0100
Hi Jeff,

my experience is same as yours, the RSSI is very volatile. I think you should not build on this value at all. The magnitude of it is what may be considered but not the actual value. It depends on a huge variety of factors. If you need to measure your antenna, then you'll have to buy a dedicated device. I'm pretty sure that the i* devices were not developed for precise measurement but for everyday operation.

Regards,
Andras


2013/2/25 Jeff Hosack <email@hidden>

1 - How accurate are the RSSI measurements intended to be?  I was measuring the power of a device with my iPod in the open air; they were about 8 feet apart.  I called scanForPeripheralWithServices and let it run for about 18 seconds, collecting didDiscoverPeripheral messages.  The RSSI values ranged from -87 to -74 dBm over that time, a 13 dB range.  Isn’t that range a bit wide?

 

2 - Are the RSSI measurements are averaged over time, or instantaneous?  This is especially important to know for the readRSSI and peripheralDidUpdateRSSI combination.  I intend to put the device and iPod in an RF isolated box and make measurements using these calls.  I am hoping for a much tighter variance than 13 dB, so that I can determine if the antenna on my device is functioning as designed.  I would like to make just one measurement, and get the correct value at that instant.

 


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References: 
 >BLE issue with iOS 6.1 (From: Jeff Hosack <email@hidden>)
 >BLE RSSI questions (From: Jeff Hosack <email@hidden>)

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