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I used the instructions on CB Tricks, along with this info. (replace R38 w/ 10K, C46 to 390pF, & wire from C114 (+) with a 470ohm.) I first used a IRF520 with the pre made EN1230, and I also made a companion part using a diode and 3.3K/470 resistor combo. All polarity has been observed. I...

Just to add to the confusion, I removed the bias pot I added to the gate. Hooked up the radio to a running vehicle and Im getting 4.5W DK and a swing to just above 10W. The bench ps was a 12V deep cycle battery that all previous testing was done on. Im assuming the difference was just in the...

I found a TX only 8v... If I put 3.5v at the gate of the IRF520 the wattage goes down?!? I used a pot (0-20K) and If I dial it in for max performance, Its at around 1.25v at the gate, and it seems the only thing the extra voltage is affecting is the DK (goes from 1-5w swing, to 4-5w swing with...

Ok, so I did find this thread, good to know someone else out there had the same exact problem as I. Cobra 25 ERF2030 upgrade I guess Ill just have to hunt down a TX only 8 volt supply, I'd rather do that than run a constant off of a 12 volt supply. Anyone know where I can grab said 8V?

Ok, so I did the IRF520 conversion (with companion parts) and the results are poor. Im getting 1.5w DK ~4.5W peak swing (pep) I tried diagnosing the problem, using another 520, and checking values at various points. I did find that the gate voltage is sitting at .2 volts, with modulation...