[Lowfer] Fw: 19.2 kHz - VTX4 - India

[David L. Wilson]

Thanks,
I was more expressing concern for my identifying them.  I do similar to you
with web radios to confirm activity and sound.
I have now given up on hearing RJH90 on its 25.1 kHz (saw it on the others)
and RJH63 on 25.0 and 25.1 (saw it on the others also).  RJH69 puts in the
best signal on all 5 frequencies.  Saw RJH77 also on all 5 frequencies.

Will wait to catch La Moore off the air.  Did see JJY earlier in the week
also.  Currently trying to figure out the nightly intermittent activity
(around 2200-2400 EST) on 18.9.   Suspect Russians.   Also, seems to tune up
first on 18.6 for some reason.

--
David L. Wilson


> -----Original Message-----
> From: lowfer-bounces at mailman.qth.net [mailto:lowfer-
> bounces at mailman.qth.net] On Behalf Of jrusgrove at comcast.net
> Sent: Sunday, January 26, 2014 6:03 PM
> To: lowfer at mailman.qth.net
> Subject: [Lowfer] Fw: 19.2 kHz - VTX4 - India
> 
>  David
> 
>  Here's some further info on my reception reports of 19.2 kHz - VTX-4 -
India
> the past couple years.
> When identifying a VLF
>  station I go through the following process.
> 
>  First I determine if there are any known receiver spurious signals in the
> frequency range. Luckily I  have only two weak ones - one each at about
> 10.67 kHz and one at about 22.6 kHz. They typically have  a distinctive
sound
> unlike any of the bonafide FSK or RTTY transmissions. Here's a short .mp3
of
>  22.6 kHz.
> 
> http://www.w1vd.com/22dot6kHz.mp3 .
> 
>  For comparison here is an .mp3 of  19.2 kHz - VTX-4 taken a short time
ago.
> 
>  http://www.w1vd.com/19dot2kHz.mp3
> 
> although weak, it has the characteristic FSK sound as with  other VLF
signals.
> Here is a spectrogram at the time of the recording.
> 
> http://www.w1vd.com/VTX4012614.jpg
> 
>  I also watch and listen for the signal at the same time and other times
of the
> day to see if it's  a regular occurance. The reception must occur at an
> appropriate time of day.
> 
>  Finally I look for corroboration from other receivers around the world.
For
> this I use the World  Wide Lightning Network (WWLN) receivers. I pick
> receivers from their worldwide array in  the vicinity of the transmitting
> station. Here's a link to their receivers.
> 
>  http://webflash.ess.washington.edu/
> 
> scroll about half way down the page ... locations are shown  at the left.
Also,
> here's a handy visual link to most of the receivers. Click on them for
full size
> images.
> 
> http://webflash.ess.washington.edu/spectra.html
> 
>  For 19.2 kHz - VTX-4 - India I'm particularly interested in the
Singapore,
> Beijing and Nanjing spectral  displays. They clearly show activity on that
> frequency as do other receiving stations further away.
> 
>  That's the ID process in use here. I rarely report a station on a first
reception
> other than a short  term Tacamo transmission as I really want to avoid
> sending anyone on a wild goose chase!
> 
>  Jay W1VD  WD2XNS  WE2XGR/2  WG2XRS/2
> 
> 
> 
>  ----- Original Message -----
>  From: "David L. Wilson" <dwilson314 at verizon.net>
>  To: "'Discussion of the Lowfer (US, European, &amp; UK) and MedFer
> bands'" <lowfer at mailman.qth.net>
>  Sent: Saturday, January 25, 2014 7:26 PM
>  Subject: Re: [Lowfer] 19.2 kHz - VTX4 - India
> 
> 
> >I have never seen 19.2 kHz here after many tries and worry about the fact
> > that it is a common data rate frequency and interference might be
> identified
> > as it.
> >
> > I plan another late night.  I have heard most of the Russian beta
stations
> > on all their frequencies but lack the RJH63 on 25.0 and 25.1 due to USN
24.8
> > and 25.2 being much strong here than that one.  Will try using the loop
> > tonight instead of E-field probe.
> >
> > --
> > David L. Wilson
> >
> >
> >
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