The output power of my Yaesu FT-8900 quad bander has dropped to 0.25 watts,
regardless of power setting. 10, 6 & 2 meter TX output is nominal
(5/10/20/50 watts). Current draw on UHF TX is 4.8 amps, again regardless
of output power setting.
The final device in the radio is a broadband power MOSFET covering all 4
bands, so it's OK. I'm thinking something possibly opened between the
MOSFET drain & antenna (switching diode, filter etc.), but why would the
current be so high even on low power (low power on the working bands is
around 1.4 A)?
Bob NO6B
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