I reimage the sbitx software and booted the radio. Now the radio is able to recieve and does not shutdown when I attempt send CQ in FT8 mode. However,? FT8 is the only mode that will transmit any power at all across all bands. With the power set to 20 watts the watt meter indicates 9 watts. No power output is indicted on any of the remaining modes or bands. I additionally performed the upgrade to v1.1.
The transformer of the IRF510s was used to drive a low impedance input of the IRFZ24ns (10 ohms each side). You could, instead, use the PA transformer to up it to 50 ohms. Instead of the three turns of the red/ornage wire secondary, remove one and make it a two turn secondary. Now wire up the two ends of the primary (that originally went to the IRFZ24Ns) to the two ends of the IRF510 drains (After removing the IRFZ24Ns!)
To increase the IRF510 current, short out R59, R65 and R72. Bias the transistors for about 150 mA each (300 mA total). You can also try removing R58 and R55 to pump the gain more. You should be able to get 10 watts, at least on the lower bands, much like the uBitx.
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On Tue, Sep 27, 2022 at 7:03 AM WP3DN <3voltios@...> wrote:
