In a message dated 10/13/2007 12:37:32 PM Eastern Standard Time,
wc6w_amps@yahoo.com writes:
In order to meet the price, weight and broadband
requirements discussed herein the past few days, I
offer the following approach:
Start with the 1500 watt peak output amplifier
described in the old APT application note, APT9701,
which posits 25¢/watt for a Class C amplifier section
with 70% efficiency at 27 MHz (ISM band, not CB!). Add
some ferrite to the transformers for wideband
operation.
The heaviest part of the unit will be the heatsink &
fans which will be required to remove about 600 watts
of heat, figuring an overall wall socket to antenna
efficiency circa 55%.
Marv - Why not use Class-E for the final amplifier if you are going to use
EER? Efficiency 90% . You would only need to dissipate 150 watts in the
heatsink
vs 600?
73 - Todd WD4NGG
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