I am unsure that this is an actual number station although it is often called such. I understand it is military in nature. Regardless, Here is my observations from the last week or so
I've been following this one via remotes in or near Korea (south) and am finding it daily:
21:00 utc 5485 kHz - 5487 kHz It starts around 5485 and drifts up during the approximately 10 minute broadcast.
Also found at 21:00 utc on 3042 kHz- 3044 kHz. The 3 mHz frequency doesn't drift quite as much as the 5 Mhz frequency
Both of these frequencies are also active at 9:00 utc which is not a good time for me to monitor on most days
V28 is extremely weak and unstable with funky muffled audio. If you've ever heard this one its real weird with a shouting female and sometimes male voice that seems to scream at you. It's pretty unforgettable. It is best heard near the Korean peninsula. Even some of the Japanese remotes aren't able to receive it.
Here is audio from yesterday 24-August-2026 recorded from the Daegu City, South Korea kiwisdr:
https://app.box.com/s/0xv8ir9wmbnjrsde0pz5qvkzifiqtr6mHere is an image of yesterday on the waterfall from Daegu City, South Korea:
https://app.box.com/s/v4ad1xy4yxhzlavt0w2291li5st5cxe6Compare that image to the image from Oita, Japan remote on 21-August:
https://app.box.com/s/4tdienadeu3znwn9xz80ngg9ofcd02arThe audio from Oita only had a few seconds of audible modulation.
https://app.box.com/s/gz9w3u2owob0fom3493uca68bpisehxb