One thing the advocates of N types quietly forget that there are 2 sorts of N type, a 50 ohm and a 75 Ohm. These of course have different thickness centre pins, which at a glance look much the same. If you are unwary and screw a 50 Ohm male into a 75 Ohm female, then "bingo" - you have wrecked it, the female bit splits. 73 Derek G3RAU