[SOC] Not QRP

[Ian C. Purdie]

This is a remarkable project by Ralph W5JGV. Quite remarkable for those with an
interest in wide ranging matters [like me]

"This article describes the design and construction of a high power solid-state
LF transmitter for use at Part 5 Experimental Station WC2XSR/13. The design
concept was to build a high efficiency unit, similar to a conventional
switching power supply. It was designed to operate at LF on 166.5 KC, with the
ability to modify it for use at MF near 440 KC."

"It was desired to operate the transmitter from a low voltage power supply, as
this would minimize the insulation requirements of the components and increase
operator safety. Additionally, low voltage rated components generally are less
expensive. The design objectives were achieved, and the measured efficiency was
in excess of 95%. While operating at a power output of 500 watts, the heat sink
gets just barely warm. There is almost no noticeable temperature difference
between the case of the PA transistors and the heat sink."

This is 400 watts from a +24 Volts @ 24 Ampere supply

http://home.att.net/~shmrg2/1665tx.htm

Main Page:

http://home.att.net/~shmrg/


72/73's

Ian C. Purdie
Budgewoi N.S.W. Australia - Co-ords S33�14', E151�34'
VK2TIP "I'll give ya the TIP mate" QRP-L #1978. SOC #171 FP#91
http://www.electronics-tutorials.com/