RF IMS POWER SUPPLY pt 3

Book available soon at our Non Profit Green energy web http://www.lablancinventors.org/

visit our web site for more pics of this radio we are writing the book on at http://www.lablancinventors.org/pics

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The transformers were at:
127* F for T3 (filament) after 2 hours with no fan cooling.
T1 ran 104*F after 2 hours (high voltage transformer).
D1 diode for filament power supply ran at 110*F after 2 hours
Q2 pass transistor for filament regulator circuit ran 101*F after 2 hours.
Fan for top case was turned on after 2 hours and marked cooling took place within 5 minutes:
T3 ran at 106*F after 5 minutes of cooling
T1 ran at 96*F after 5 minutes of cooling
D1 diode ran at 98*F after 5 minutes of cooling
Q2 ran at 90*F after 5 minutes of cooling.
ambient temp: 80*F
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41 minutes after fan cooling turned on:
T1= 85*F
T3= 92*F
D1= 92.6*F
Q2= 88*F
Ambient temp: 80.6*F
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58 minutes after fan cooling turned on:
T1= 83*F
T3= 92*F
D1= 92.1*F
Q2= 86*F
ambient temp: 80.9*F
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The efficiency of the high voltage power supply is decent with a 82% AC to DC voltage conversion when 78 watts is produced. But the efficiency improves when output is jumps to 302 watts; then the efficiency improves to 87%.

The filament section is poor due to the regulator circuit that is needed to control variations in filament voltage that is critical to tube life and RF stability. The AC to DC conversion is only 42% when 31 watts is produced.
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Note: the power supply is much cleaner concerning ripple noise when the scope and power supply share an isolation transformer.
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This is a teaser for the 6 MHz to 27.2 MHz radio frequency transmitter prototype we are designing and building.
The book to build this unit will be available in late 2016. The high voltage vacuum tube power supply is Hammond 278CX transformer at 800 volts filtered DC X 535 ma. (that's 428 watts available). This HV power supply has a built in 500 watt Staco 501C Variac to adjust it. It's filtered with 500uF X 900 VDC caps and uses a DC choke to also regulate and filter it. The filament power supply is also filtered with 47,000uF caps and 10 amp DC choke and voltage regulated with adjustable circuit. The PI network has a 7 inch long adjustable coil and 2 adjustable multi-turn air caps to tune the tank circuit and load. There are pin jacks all over this unit to check amps, volts and frequency. It has built in frequency meter and Hobbs meter to track time use. Adjustable Pi network is also for changing frequencies and adjusting for loading conditions. Designed for 50 ohm output. Can run function generator input instead of easy changeable crystals. Can run 3 large socket vacuum tubes like the 6L6GC and 1 KT88. It also has provisions for 4 small socket vacuum tubes or RF transformer in small socket case. Can make an armature Radio transmitter with these provisions. An air cooled vacuum tube cooling system that controls tube temps as well as transformers, heat sinks and control transistor for the filament power supply is powered with 2 large 120 VAC box fans.
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Note the Filament and Plate power supply weigh 40 pounds together.
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Industrial, Scientific and Medical (ISM) equipment

ISM equipment

The term Industrial, Scientific and Medical (ISM) generally refers to equipment or devices that utilize radio frequency energy to perform work. The IEC defines the term;

“Qualifies equipment or appliances designed to generate and use locally radio frequency energy for industrial, scientific, medical, domestic or similar purposes, excluding applications in the field of telecommunications”

Видео RF IMS POWER SUPPLY pt 3 канала Lablanc Engineering-two