Motorola PTP 54400


I have a 150km link, with two Motorola PTP xx400 Conectorized, one with a 4ft antenna dual pol and a 6ft dual pol.

My problem is that they link up and the graphicall install says that they are looking each order in 75db just as the linkbudget predicted, but it stay red, suddenly it goes up for a day and then goes down for another day.

I have no interference, except for ocassional impulse interf., however the link does not go up again

Anyone have a similar problem, we have several working links like this one?

Any help will be appreciated.