[hpsdr] off line modulators

[FRANCIS CARCIA]

hi All,
A few issues after my QRO Class e Final was published in QEX my friend Bob, N9NEO did a nice article on an off line PDM modulator using a TI phase modulator PWM. I heard it on the air and it worked well. WA1QIX also did a push pull PDM modulator off line.  This is very common and provides line isolation. I would use at least an isolation transformer for safety. You can pull a lot of current before a breaker trips. Frank WA1GFZ
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