Category Archives: 160m

A Pulse Width Modulator for the FAT5 160M Class E Transmitter

After a few months of operating my FAT5 160m AM Class E transmitter with its linear modulator, it was time to try Dave and Eric’s Pulse Width Modular module (PuWMa). This is a PWM using the Texas Instruments’ UCC25701 PWM chip, with TC4421 drivers and IRF640 switching FETs, followed by the obligatory Low Pass Filter to clean the 170kHz AC off the modulated DC.

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160m 100W Class-E AM transmitter (FAT5)

The FAT5 project is a 100 watt Class E AM transmitter from Dave GW4GTE and Eric GW8LJJ, dating back to 2011. The name derives from Dave’s desire to design a 100 watt AM workhorse using contemporary FETs to rival the ubiquitous AT5, a widely used war surplus boat anchor for low band AM.

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