I have a type 18 vhf book, 6-26-1947, small vhf transmitter, 121.5-132 mc used in light aircraft. Should be a type 16 book here but I can't immediately find it. BTW, the 190-520 and 520-1,1500 kc receivers both have adjustable slugs in the IFs for coupling. All of the IFs have trimmer capacitors. - Gordon White