According to Jiji Tsushin on December 29, 2023, KDDI decided to remove aged 2 shortwave transmitters from Yamata transmitter site in Koga, Ibaraki Prefecture.
The removing works will be done in 2024 fiscal year (April 2024-March 2025) for 10 months. During the period some services, such as "Shiokaze" to North Korea, will not be able to transmit on 2 waves at the same time.
The original article is at https://sp.m.jiji.com/article/show/3131899
At Yamata transmitter site, there are 7 shortwave transmitters.
Hitachi Kokusai Electric SP-1 300kW x 1 SP-1 100kW x 2 (reduced power from 300kW in 2008-2009) installed in 1993
Ampegon TSW2300D 300kW x 4 installed in 2013
Probably each one of old Hitachi Kokusai Electric 300kW and 100kW transmitters will be removed.
(Takahito Akabayashi, Tokyo, Japan via WOR List)
Picture credit : Morikazu Kogen via asahi.com