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hardware:hardware.dbbc.power_measure [2012/03/29 02:51] Stuart Weston |
hardware:hardware.dbbc.power_measure [2012/04/01 23:31] (current) Stuart Weston |
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=== New Zealand DBBC 09/06/2011 === | === New Zealand DBBC 09/06/2011 === | ||
- | Testing of DBBC power measurement device reveals that it has a **logarithmic output response**!! | + | Testing of DBBC power measurement device reveals that it has a **logarithmic output response**!! This is for the "dbbcifa" command as it has to cover -3dBm to -48dBm (Gino on site at Warkworth 1/4/2012). |
Update:13/6/2011: Logarithmic response verified, 37 mV/dB according to data sheet {{:hardware:hmc610lp4-datasheet.pdf|}} | Update:13/6/2011: Logarithmic response verified, 37 mV/dB according to data sheet {{:hardware:hmc610lp4-datasheet.pdf|}} | ||
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{{:hardware:linearity-test-jun-2011.xls|}} | {{:hardware:linearity-test-jun-2011.xls|}} | ||
+ | {{:hardware:linearity-test-jun-2011-1.xls|}} | ||
{{:hardware:dbbc-linearity.jpg|}} | {{:hardware:dbbc-linearity.jpg|}} | ||
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I'll attach the FS s/w for this in due course. | I'll attach the FS s/w for this in due course. | ||
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+ | === dbbc01 === | ||
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+ | The "dbbc01" commnad gives power readings in a linear scale. But only for the sub-band of the total band set. (Gino on site at Warkworth 1/4/2012). If you have set dbbc01 to have a freq of 750MHz and a bandwidth of 16MHz, then you only get a linear power reading for the 16MHz part of the full 512MHz band centered on 750MHz. | ||
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