Yesterday, December 31st, I drove to portland for the day. When I was there, the north approach sector was on 133.0 instead of 124.35. this was the frequency listed on old charts. (I don't know when that changed) but I was surprised that it is being used now, since all the current charts show this sector using 124.35. Does anyone know why they switched frequencies?
(If you want to provide a feed for this frequency, the ground transmissions come in clearly along I-5 north of the airport, so it may be transmitting from scappoose or the BTG VOR site)