I finally finished a Class E AM transmitter kit (about 1"x 3") with a homebrew modulation transformer fed with a 50 Watt Chinese audio amp (12.50 postpaid). The metalwork to add switches, relays, power connectors , BNCs, boards, etc took forever but I didn't end up with any extra holes (there is one that's oversized however)
Makes a very nice 100% AM modulation waveform @ about 140 V ptp (maybe what, 40 watts PEP...I don't have my calculator) .
Winding one 40 foot length of wire for the secondary and 30 feet for the primary onto a T200 toroid for a modulation transformer takes some patience
The waveform below is a 1Khz tone into a 50ohm load at 7.290 Mhz. Vertical axis is 20v/div.
Fun stuff!
John
Makes a very nice 100% AM modulation waveform @ about 140 V ptp (maybe what, 40 watts PEP...I don't have my calculator) .
Winding one 40 foot length of wire for the secondary and 30 feet for the primary onto a T200 toroid for a modulation transformer takes some patience
The waveform below is a 1Khz tone into a 50ohm load at 7.290 Mhz. Vertical axis is 20v/div.
Fun stuff!
John
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