re it's been ages since ..
yes, June 8th / 9th, 2020.
Re TAIWAN / CHINA Mainland :
18899.618 0500-0600 TWN SOH Xi Wang Zhi Shen Chi Miaoli 13.13 UT June 9
18900even CHN  CNR1 mainland jamming noted at 04-08 UT on June 8, 2020,
         12 kHz wideband signal block. S=9+30dB,
         transmission end at 06.59:57 UT, and followed
         TX  SIGN-OFF exact at 07.00:03 UTC.
18969.997 TWN  SOH Chinese, S=4   at 04.40 UT on June 8, 2020.
18970even 0400-0500 CHN CNR1 Jammer/Firedrake. S=7-8 in Tokyo JPN SDR
         18 kHz wideband audio block.
         Also 10 kHz wide OTHR signal in Far East Asia too.
21799.649...645 wandered 06.53 UT June 9 SOH Xi Wang Zhi Shen. Miaoli
               S=7 at Hiroshima JPN remotedly. Unstable fq unit.
21799.698 2300-1000 TWN SOH Xi Wang Zhi Shen. Miaoli S=3-4 Hiroshima
21800even 0400-0500 CHN CNR1 Jammer/Firedrake. S=6-7 04.20 UT June 8.
         S=8-9 on June 9, 2020.
[selected SDR options, span 12.5 kHz RBW 15.3 Hertz]
(wb  df5sx, wwdxc BC-DX TopNews June 1 - 10 monitored on Perseus Net)

easy task:

How do you know it was SOH and not rather CNR1 jamming ...

SOH - mostly much ODD fq.

CHN CNR1 fullpower jammers from DongFang Hainan isl, Urumqi or Kashgar sites
instead
as 20 kHz wideband audio block visible on the Perseus software screen;
... and mostly exact even frequency or minus / plus 2-3 Hertz odd fq only
... (wb)