I modified the one I had to match the later version of schematics he shows. This does not match the schematics on the website listed below. Later versions of the Dentron unit shown here may be built for more power.Īs I received this tuner, the left hand capacitor was wired as a sort of "voltage divider" similar to what is used on the output of the Johnson Matchbox JR. Some similarities to the Johnson Matchbox JR 275 watt tuner can be drawn, and perhaps I am being too conservative in my speculation on power rating. MFJ likely would have advertised this tuner as a 300 Watt unit. This manual tuner extends the range to work with an end fed wire, G5RV, open wire fed doublet, or the band edges of a standard 80 meter dipole. The internal tuner in the FT-450 will not match more than a 3:1. Damage to the plastic coil may result with full duty cycle full carrier 100 Watt AM. But I doubt it will handle a 100 Watt AM rig like the DX-100.
If he inherits my DX-40, it will likely be fine with that, or a barefoot DX-60 too. I purchased this nice little 100 Watt CW or SSB PEP class antenna tuner at a swap meet as a gift to a friend, to use with his Yaesu FT-450.
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