I also have a MFJ-264. I figured if I need a dummy load, go with one that will handle the most watts I will ever need.
I don’t have much room, the MFJ-264 id s 1.5KW dry dummy load for 1-650MHz. A little smaller than a carton of cigs.
Haven’t used it yet.
I usually do testing in CW or SSB. In CW the duty cycle is 50% and in SSB
about 10% with not too much processing. A few seconds is enough to diagnose
Years ago when testing a 200W home made amp I used 2W resistor immersed in
water. Worked good enough.
Perhaps for longer duty one can use cantenna dummy load ( MFJ-250), also
immersed in water. Or attach 1-2 small fans to MFJ-264.
On Wed, Jul 24, 2019 at 11:06 AM Larry Gauthier (K8UT) <[hidden email]>