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Post subject: ORFS Reference Power
Posted: Fri Aug 08, 2008 5:10 am
Joined: Tue Apr 22,
2008 8:24 am
Recently, during testing, I
request the DUT to transmit the signal at EGSM,
CH38 and PL5. and I measure it using both R&S
CMU200 and Agilent 8960. The Reference Power for
"Spectrum due to Switching" is around 33.87dBm,
whereas the Reference Power for "Spectrum due to
Modulation" is around 25.73dBm. So, I was
wondering why there is about 8.14dB different.
According to my colleague, he mention
that this is because of the definition of the
"Spectrum due to Modulation" which require the
average power of the whole channel, which is
average power of the 8 time slots. And after
calculating using the 33.87dBm,
(10^33.87/10) / 8 ] = 24.84dBm
calculated is 24.84dBm, but it has around 1dB
different from the measured power.
am curious whether is the method that my
colleague thought me is wrong or is the way of
the instruments measure differently. Please do
let me know about why is this happened. And I’m
interested on how these Reference Power are
calculated/measured as well.
me know if you need further details.
Thanks in advance!