Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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My Hobby Website:
ESD HBM model Test Bench - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: WiMAX amplifier Posted: Sat Sep 19, 2009
Joined: Wed Jun 04, 2008 3:23 am
In the datasheet for a WiMAX amplifier, a channel power is defined
as well as an output P1dB which is higher than the channel power. What
is the definition for both and how does one measure the quantities?
Post subject: Re: WiMAX amplifierPosted:
Sun Sep 20, 2009 3:48 pm
Joined: Mon Jun
27, 2005 2:02 pm
I guess that by channel power the definition is for the average
output power of the amplifier per a given channel (Frequenc band). This
is the output power in steady state under given settings like: filter
(Raised-Cosine etc), clipping rate, modulation scheme etc, which actually
set the PAR (Peak to Average Ratio) and by this determine the average
P1dB is the output power at which the amplifier's small-signal
gain is decreased by 1dB. This power level is close to the saturation
power level, and in many cases can be considered as the peak power.
Both these power levels can be measured with power meter. Don't
forget an adequate power attenuator infront of it to protect the power
sensor from excessive power.