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Author Topic: Any News on the new Legal Limit Amps from Elecraft and Flex  (Read 24670 times)
W6RZ
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Posts: 366




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« Reply #105 on: June 24, 2017, 05:07:56 PM »

Second, the 1K80 is a much better choice because it's higher drain voltage, which makes the output transformer easier to implement and gain better overall system efficiency.

Agree, but I don't think the 1K80 is in production yet.
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W6RZ
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Posts: 366




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« Reply #106 on: June 24, 2017, 05:09:59 PM »

Both amps are using two output devices in PP...

The devices themselves are push-pull. So it's two PP devices in parallel into a combiner.
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K6AER
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Posts: 5745




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« Reply #107 on: July 01, 2017, 01:40:16 PM »

Actually two PP devices are combined in a PP combiner. The feed splitter his 180 degree outputs. The output combiner has 180 degree inputs.
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N2WQ
Member

Posts: 143




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« Reply #108 on: July 02, 2017, 04:37:03 PM »

Second, the 1K80 is a much better choice because it's higher drain voltage, which makes the output transformer easier to implement and gain better overall system efficiency.

Agree, but I don't think the 1K80 is in production yet.

Yup, it is in production and you can buy it from Richardson Electronics for $300 including taxes and shipping. Currently experimenting with new output transformer- two of them actually- to achieve much better output matching and, more importantly, flat output curve/gain. Started with the EB104.ru board and replaced the transformer. Using a different mix for the toroids as well.

Here's what another guy is doing with this amazing LDMOS:

https://m.youtube.com/watch?v=wm2Xlf5NIXI
https://m.youtube.com/watch?v=vRenbsOEwjI
« Last Edit: July 02, 2017, 04:45:15 PM by N2WQ » Logged
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