Ali,
According to me the power of a normal micro cell would be +33dB or 43dB. With respect to your cable, i hope there is no standard size of 13 mtr jumper. so, just check out your cable dia ie 1/2″ or 7/8″. Normal feeder cable is of 7/8″. Now the loss of 1/2″ cable is 7dB per 100 mtr. and 7/8″ cable loss is 4dB loss per 100 mtr. So, there is no worry of signal loss in mere 13 mtr jumper cable.
More over u can very well check the signal strength once On Air.