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#1 2009-Mar-26 10:06:59

michael1
Member
Registered: 2009-Mar-23
Posts: 4

transmission power

Hi,

in the MAX2829 datasheet it is said that the output power has a control range of 30dB. How are these 30 dB composed of the bbGain [0,2] and the rfGain [0,63] ?

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#2 2009-Mar-26 10:19:52

murphpo
Administrator
From: Mango Communications
Registered: 2006-Jul-03
Posts: 5159

Re: transmission power

The Tx RF gain covers about 30dB, with digital 0 mapping to the lowest gain. The full span of [0,63] is mapped linearly-in-dB over the 30dB range. See the middle plot on pg. 17 of the datasheet for details. The Tx BB gain covers just 5dB range, with 0 mapping to the lowest gain. See the two LSB of register 0x9 (Table 17 on pg. 36 of the datasheet) for details.

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#3 2009-Mar-26 13:02:32

HT
Member
Registered: 2008-May-12
Posts: 31

Re: transmission power

Hi.
Any idea what has to be the received signal strength that node will still receive packet successfully ? (~min&max)

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#4 2009-Mar-27 20:31:21

murphpo
Administrator
From: Mango Communications
Registered: 2006-Jul-03
Posts: 5159

Re: transmission power

I don't know the range of Rx power off hand, though it's something we're hoping to characterize for an upcoming reference design. The tricky part is that it depends on a lot of parameters. For example, if enough energy is received that a short QPSK packet could be decoded, but the packet detector doesn't trigger, the packet will still fail.

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#5 2009-Mar-28 05:09:00

HT
Member
Registered: 2008-May-12
Posts: 31

Re: transmission power

Hi.
I was thinking its bit tricky to characterize. Hopefully you guys will get some values...

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