Month: May 2016

Yaesu FT-891 update

Update: The Yaesu FT-891 is the smallest at lightest 100W HF transceiver ever built, at 155x52x218mm and 1.9Kg. Unfortunately the 2A current draw on standby makes it unsuited for truly portable operations. Among other features worth mentioning would be the 3kHz wide roofing filter (yes, at the 69MHz IF) and the USB port that supports CAT, PTT keying and RTTY data. Yaesu FT-891 is on public display at Dayton 2016.       It covers 30kHz to 56MHz on receive and transmits in the amateur bands from 160m to 6m with 100W output, has a 69.450MHz 1st IF and...

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MRF1K50H – new 1500W LDMOS from NXP

LDMOS technology allowed huge improvements in RF power transistors in the recent years, bringing much better performance and efficiency at a lower price point than ever before. A pair of top-of-the-line MOSFETs of the late 80’s such as the MRF157 are specified at 1.2KW with 45% effciency in AB class up to 50MHz and would set you back almost US$ 1000 even today. Compared to that, the new generation LDMOS offer more power than that at 70+% efficiency and 1/4 the cost, while they work up to 500MHz. MRF1K50H is the name of the latest and greatest LDMOS RF...

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