Hard-Core-DX.com

Happened few times in past decade also.
VIETNAM   11885 kHz  Some bad accompanied audio strings happened again on
the VoVTN outlet from Son Tay, French service at 1900-19.56 UT. Happened
ome ? 5 years ago in 31 mb of Son Tay TX outlet. Today heard VTN Son Tay
on exact 9730 kHz underneath CRI Portuguese on CO-CHANNEL bad fqy coordi-
nation.
11885 kHz Son Tay suffered by bad sideband strings heard and seen 7, and
9 and 17.5 kHz apart away distance on both sidebands too. 11903 kHz
approx. too. on 11895 kHz CRI Kashi in Cantonese language also covered.
[selected SDR options, span 12.5 kHz RBW 15.3 Hertz]
(wb  df5sx, wwdxc BC-DX TopNews April 1, 2025)

and in May 2021 too:
VIETNAM To: Phong Tieng Duc Ban Doi Ngoai <deutsch_vov -at- yahoo.com>
Side broadcasts from 9730 kHz Hanoi Son Tay.
Dear editors of the German broadcasts,
I wanted to let you know that your station on the frequency 9730 kHz
also has side emissions on 9704 and 9754 kHz that can be heard in Europe. 
The

main frequency is currently (1850 UTC) 35433.
Best regards, Dr. Hansjoerg Biener, May 12.Re: Side emissions from 9730 kHz Hanoi Son Tay.
Hj. These are the old Made in USSR transmitters, around 30 years old, in the 
Son Tay

transmission center west of Hanoi.One of the six transmitters has a control fault and produces
audio track strings, always 8 kHz apart,
like a garden fence – visible on the software screen,
e.g. in the Perseus RX screen.
This has been happening on and off for at least a decade, recently more 
often

in the 41 mb around 7280 kHz, but mostly in the 31 meter band,
when the 6th - faulty - transmitter is in use.Tonight, 9730 kHz is actually covered by a 500 kW system, by CRI
Portuguese music program from the center of Kashi-Kashgar,
powerhouse S=9+50dB or -21dbm, a really crazy strong signal from
Kashgar Tibet, on the Kyrgyz border.
The German—now English—program from Hanoi Son Tay is best heard today
on 9706 and 9754 kHz, from 16:00 to 22:00 UTC;
otherwise the garden fence on both sides, shows exact transmitter strings at 
the

9738, 9746, 9754, and 9762 kHz frequencies upperside,
and 9690, 9698, 9706, 9714, and 9722 kHz frequencies lowerside.[selected SDR options, span 12.5 kHz RBW 15.3 Hertz]
(wb df5sx, wwdxc BC-DX TopNews May 12, 2021)
VIETNAM   To: Phong Tieng Duc Ban Doi Ngoai  <deutsch_vov -at- yahoo.com>
Nebenausstrahlungen von 9730 kHz Hanoi Son Tay.
Werte Redaktion der deutschen Sendungen,
ich wollte Ihnen kurz mitteilen, dass Ihr Sender auf der Frequenz 9730 kHz
auch in Europa hoerbare Nebenausstrahlungen auf 9704 und 9754 kHz hat. Die
Hauptfrequenz ist aktuell (1850 UTC) mit 35433 zu hoeren.
Mit freundlichen Gruessen, Dr. Hansjoerg Biener, May 12.
Re: Nebenausstrahlungen von 9730 kHz Hanoi Son Tay.
Hj. das sind die ollen Made in USSR Sender, um die 30 Jahre alt im Son Tay
Sendezentrum westlich von Hanoi,
Einer von den 6 Sendern hat einen Fehler in der Steuerung, und produziert
Audio Spur Strings, immer in 8 kHz Distanz zwischen den Strings entfernt,
wie ein Gartenzaun dargestellt - sichtbar auf dem Software Screen,
z.B. im Perseus RX screen,
dies seit mindestens einem Jahrzehnt tritt immer mal auf, letztens oefters
auch im 41 mb rund um 7280 kHz, aber meist im 31 Meterband,
wenn der 6. - fehlerhafte - Sender im Einsatz ist.
Heute Abend ist 9730 kHz eigentlich durch eine 500 kW Anlage, durch CRI
Portugiesisches Musikprogramm aus dem Zentrum Kashi-Kashgar zugedeckt,
powerhouse S=9+50dB oder -21dbm, ein wirklich irre starkes Signal aus
Kashgar Tibet, an der Kirgisengrenze.
Das deutsche - jetzt englisches Programm - aus Hanoi Son Tay ist heute am
besten auf 9706 und 9754 kHz zu hoeren, von 16.00-22.00 UTC;
ansonsten der Gartenzaun beidseitig, zeigt genaue Senderstrings bei den
9738, 9746, 9754, und 9762 kHz Frequenzen upperside,
und 9690, 9698, 9706, 9714, und 9722 kHz Frequenzen lowerside.
[selected SDR options, span 12.5 kHz RBW 15.3 Hertz]
(wb  df5sx, wwdxc BC-DX TopNews May 12, 2021)

From: Dave Hughes via groups.io
Sent: Thursday, March 12, 2026 6:21 PM
Subject: [WOR] Voice of Vietnam on 11913.43 kHz
I've seen this for a few days on many kiwi sdrs. Seems in parallel with VoV 
on 11885 kHz.
With strongest signal on Twente SDR but it is audible all over Europe but 
barely
audible in Asia/Pacific region. Presumed to be a spur from Son Tay, Hanoi 
transmitter.
As I write this I see it also on 11856.52 kHz. 

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