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Author Topic: Flex PowerGenius XL  (Read 2563 times)
AC2RY
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Posts: 277




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« Reply #15 on: October 31, 2017, 12:45:31 PM »

The reason we have 12 volt amplifiers are for mobile operation.

For base station operation the  50 volt LDMOS devices are much better for the higher voltage is the best match into 50 ohms with broad band magnetics of the splitters and combiners.

With DC/DC converters having 95-98% efficiency there is no more 12 volts limitation. Do not forget that both bipolar and MOS transistors have output impedance module around 2 ohms. You cannot present too low impedance (transformed from 50 ohms load) and expect good results - you only work with about 8 volts RMS in push-pull circuit with 12 volts power supply.
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AC2RY
Member

Posts: 277




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« Reply #16 on: October 31, 2017, 12:49:34 PM »

Quote
IMD will cause emission outside of specified bandwidth and thus restrictions above should be applied.

Perhaps they should but in fact, they are not. A quick glance through the certification lab reports for part 97 amplifiers will make this clear.

- Glenn W9IQ

The requirement above is for those who USE transmitters, not hardware makers. Users should meet specified regulations and choose gear accordingly. As you probably know IMD is almost irrelevant for single tone transmission modes like CW or RTTY. FCC does not tell you HOW to use amplifiers.
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K6AER
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Posts: 4663




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« Reply #17 on: November 02, 2017, 09:53:29 AM »

RTTY is single tone?
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