I finally got my FC-347 wired up to Cobra 148gtl. Instructions only showed how to wire up to a older cobra 148gtl and a SuperStar SS3900.....I wired it up like instructions showed but It read 45.000 so I thought i did something wrong.......I clicked on link above and did the Jumber mod inside of freq counter.....It fixed the problem and works fine.....I wonder why they don't say anything about that in the instructions, Also, what is the difference between the FC-347 to the FC-390, It looks the same... 73's all :roll: