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)
> 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
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