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SPEC SHEET ON 2SC2879

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Old 09-14-2009, 04:46 PM
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Default SPEC SHEET ON 2SC2879


I need a good spec sheet or listing on the 2SC2879 Transistor drive reccomendation Saturation points ETC
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Old 09-14-2009, 05:09 PM
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here ya go . all power ratings are PEP . it rated at 100 watts pep @ 28 MHz.

2SC2879 Datasheet pdf - TRANSISTOR SILICON NPN EPITAXIAL PLANAR TYPE 2~30MHz SSB LINEAR POWER AMPLIFIER APPLICATIONS (LOW SUPPLY VOLTAGE USE) - TOSHIBA

page 2 : input power , 6 watts typical 10 watts max
page 1 : maxium collector power dissipation 250 watts .

look at the graphs on page 3 for the power input to output ratios .
after 8 or 10 watts it starts leveling off , compression is setting in . can still do more watts though .

the intermodulated graph shows how distortion is related to input .
its at its lowest at 60 watts and starts rising from there .
does anyone think its get cleaner when you go beyond 100 watts ?

this is what Toshiba says . they designed and manufacture it .
i guess the folks claiming 200 , 300 and 400 watts out of them know something the folks at Toshiba doesnt .
i know power meters are broad banded devices and dont know what frequencys/harmonics are showing up as power on those meters .

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Old 09-14-2009, 08:29 PM
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THANKS BOOT SCOOTIN BOOGIE!!
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Old 09-14-2009, 08:50 PM
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LOL youre welcome .

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Old 09-14-2009, 08:56 PM
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I find it amazing how there are so many different ratings on these accordin to who you talk to. Some of the amp builders claims just dont ad up after looking at this spec sheet.
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Old 09-14-2009, 11:06 PM
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you will notice the the (power gain) of the 2SC2879 listed as Gp=13dB. at that figure exactly 5W IN
is equal to exactly 100W OUT. if you'll check the Power out vs. Power in (Po - Pi) graph you see that
at just under 5W IN produces 100W OUT. the device modelled in the graph has just slightly more than
13dB. of gain but the two correlate pretty closely. you'll also notice in the graph that both input and
output power levels are measured in PEP.

Toshiba 2SC2879

Last edited by freecell; 09-14-2009 at 11:22 PM.

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Old 09-15-2009, 01:04 PM
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Is this the same definition of peak that the FCC uses where you multiply one over root 2 by the voltage, then square it, and then divide by the circuit load?

V^2/2R

Or is it the instantaneous peak voltage squared divided by the circuit load?

V^2/R

How does the true power or reactive power play into it?
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