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Yep, a lot of BS!!!  I have installed thousands of coax jumpers from commercial RBS (Radio Base Station), equipment, mainly for Ericsson and ATT/Cingular,  and the only time length of coax was an issue was with length due to losses, not any magic numbers from equipment to hatch plate.  Have installed Andrew, Commscope, Eupen, RFS, and a bunch of others as well, ranging from 1/2" super flex to 1 5/8" hardline, and prett well everything in between. From the equipment to the hatch plate all coax was hand cut and Din male connectors either straights or 90's depending on the equipment would be terminated at both ends then swept with and anristu and then PIM tested after that.  If you need to use a certain or specific length of coax is if the manufacture stated it or it was a specialized piece of equipment.  Just my 2 penny's.