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Author Topic: Narrow roofing filters and SSB...  (Read 8972 times)
ZENKI
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Posts: 906




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« Reply #15 on: September 19, 2011, 01:35:08 AM »

Hi Dan

Thanks for all the information, it makes very interesting reading. I look forward to  the day when  I can build a realizable PA with such excellent IMD performance.
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M0HCN
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Posts: 473




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« Reply #16 on: September 19, 2011, 06:59:25 AM »

This is getting waay off topic, but you will not build a PA with that performance, you will build a **transmitter** with that performance....
The PA is standard and is linearized by the envelope feedback to the modulator.

One gotcha is that things like VSWR foldback have to involve the modulator as otherwise it will just ramp the drive power to try to maintain the set gain level. 

Actually with a collection of pads and a suitable power sampler head you could probably bring most external solid state PAs inside the loop, but that is a sort of advanced topic and I have not tried it yet. I suspect however that valve external PAs are right out with this system however (Too high a tank circuit Q).

Regards, Dan.
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