There's a severe noise problem affecting the 52.42 receiver at the Empire/GlenArbor repeater site. The noise is intermittent, but when it's there it's strong enough to render a 100w signal within visual view of the repeater antenna rather noisy, sometimes unreadable.
On Sunday 7/31 I spent a few hours trying to locate the source of the noise and had no success. Both the Mitrek transmitter and receiver were swapped out for the RCA backup units with no change. The antenna system was switched over to the (still in place) older system with no change. Each section of the duplexer was individually taken out of the system and there was no change... the TX/RX antennas were even split and no difference was noted. The amount of desense did not depend on the amount of power the repeater transmitted-- as it was the same at 5w as it was at 50w. All RF jumpers were swapped out to no avail. I ran out of time and returned the equipment to the way it had been previously-- except for the removal of the ARR 6m GasFET preamp from the 52.42 receiver.
During the past week the noise was prevalent quite often. The weather was unseasonably hot and muggy. When the noise is present, the repeater is useable if the station accessing it is within receive range of the W8TVC site receiver-- as the voting system does it's job well to allow that receiver to 'pick up the slack'.
Today the weather was more seasonable and with temps in the 70's (as opposed to the 90's) the noise is not present. Tonight I ventured up to the site to look into the problem and was able to document what the receiver saw from the antenna when there was no noise present. The system appeared to be functioning properly.