Kurt, the RFI specialist from National Grid, contacted John King yesterday with a report on the RFI remediation work performed at Glen Park.
Hardware on 7 poles was replaced. One of those poles is located at end of the line near Glen Manor House; the rest are closer to the park itself.
After the “ivy pole” was cleared and a one of its insulators was replaced, a great deal of noise was still being generated in that vicinity. The source of that noise turned out to be the loose tie wires on the southern adjacent pole (see the club web site for pictures.) This is interesting, because: A.) Both Kurt and John had scanned that pole (the loose tie wire pole) with ultrasonic arc detectors without hearing much arc noise, and B.) that is the pole that we most strongly suspected when we walked the line with AM receivers and rubber duck antennas. Jack, N1JK, visited the site a second time after our initial Saturday RFI hunt session and came away convinced that the interference was coming from either that pole or the building fed from that pole.
Thanks to everyone who came out to help with this effort. The Glen Park site is now completely free from power line noise.