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--- hardware:hardware.dbbc.power_measure [2012/03/29 02:50]
Stuart Weston
+++ hardware:hardware.dbbc.power_measure [2012/04/01 23:31] (current)
Stuart Weston
@@ Line 3: / Line 3: @@
 === New Zealand DBBC 09/06/2011 ===
-Testing of DBBC power measurement device reveals that it has a %red%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|}}
@@ Line 12: / Line 12: @@
 {{:hardware:linearity-test-jun-2011.xls|}}
+{{:hardware:linearity-test-jun-2011-1.xls|}}
 {{:hardware:dbbc-linearity.jpg|}}
@@ Line 18: / Line 18: @@
 I'll attach the FS s/w for this in due course.
+=== dbbc01 ===
+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.