I have an 8660C which had the 110Mhz plugin, and I accquired the 1300Mhz plugin and the required option and stuck it in. The controller is happy to tune up to 1299.999Mhz, but the output falls to 0 on the meter as soon as you pass 99.999Mhz. Anyone know how to make this thing happy? Maybe a jumper somewhere? de w1rt/john