As a case of last of the period, radio station JJC in Japan and 9VF in Singapore run by Kyodo News in Japan is the last marine weather condition fax station which faxes day-to-day news and navigational cautions. It is particularly unexpected given that it is not connected with the meteorological firm - they run their own receive fax to email free stations beginning with JMH.
Among the most essential resources for those aiming to get radiofax is the list of transmission frequencies readily available from this guide composed by the National Oceanographic and Atmospheric Administration (NOAA) of the United States. This guide is frequently upgraded where info is offered - and notes the provider frequency (i.e. transmission centre frequency) for lots of fax stations worldwide.
JJC and 9VF (on page 16) is noted with the following centre frequencies (tune to 1.9 khz listed below in USB mode for white frequency at 2300hz and black frequency 1500hz):
4316khz at 5kW
8467.5 khz at 10kW
12745.5 khz at 15kW 16971khz at 15kW - 17069.6 khz at 15kW 22542khz at 15kW 16035khz at 10kW - 17430khz at 10kW
The info is dated from 1999 - a very long time ago - and I have factor to think that the info might be inaccurate. Radiofax services have actually been decreasing year-on-year, and studies are held each year to attempt and evaluate whether it's rewarding to continue running such services. The frequencies above in strong are the ones which I have actually had the ability to hear the transmission on, although not always decipher a noticeable image.
The other frequencies which have actually not been bolded might function, however proliferation has actually not been beneficial enough to my receiver to produce any indication of the signal.
Kyodo has an extremely particular signal - the slant aspect in Fldigi is 0.004 for my sound card, compared to 0.012-0.015 for a lot of other fax services, revealing considerable balanced out. The signal is sent in IOC576 mode with 60LPM speed (i.e. half the speed of a lot of other fax services, taking one 2nd per line of 1809 pixels). Faxes take hours to send at this rate, however a minimum of it makes sure a much better quality for the fragile Japanese characters which are sent.
The signal transfers white tone for a while prior to a fax as a tuning signal, which then establishes black pips which associate the sync bar for nearly a minute prior to the transmission. The start tone is extended, about 5 seconds, followed by routine polarity sync and after that image transmission. The sync margin throughout the image duration is black, which is inverted from the routine polarity where the sync margin is white.
So over the previous couple of days, I have actually gotten a couple of faxes which are relatively “broken down” for quality - fortunately as it is analog, it is possible to get something even at low SNRs (~ 1-10dB), even if it's simply the sync margin.
When it comes to fax transmissions, clearness is affected by the signal to sound ratio, along with the doppler multipath dispersing of the signal which triggers blurring at the edges and in some cases wavy/shifted faxes. As 1809 pixels are transferred in one 2nd (for 60LPM), a one pixel shift represents a doppler multipath shift of 0.55 ms which represents a multipath range at the speed of light of simply ~ 166km!
For contrast, the range by straight line from Tokyo to Sydney is 7822km, so the pixel time has to do with 2.1% course variation. Regrettably due to the unforeseeable behaviour of the proliferation and height of the ionosphere, there is fading, in some cases deep and frequency selective triggering horizontal sound bands, and multipath fades triggering vertical lines to be doubled or tense.
Naturally, for the desired functions of the signal, this ought to not be an issue, as it is planned to serve within its NAVAREA. While we are a neighbouring NAVAREA, that is no assurance that the signal is receivable.
So here are some faxes: 27th January 2013 - JJC 22542khz ending 1956EDT (UTC +11)
27th January 2013 - JJC 22542khz ending 2040EDT (UTC +11) Sumo Match News. 27th January 2013 - 9VF 16035khz ending 2122EDT (UTC +11) Kyodo [] News.
27th January 2013 - 9VF 16035khz ending 2226EDT (UTC +11) - missed out on the start due to the fact that I didn't have Fldigi's non-stop mode triggered, and it lost connection. Kyodo News.
27th January 2013 - JJC 12745.5 khz ending 2257EDT (UTC +11) Navigational Cautions - tuning tone, pre-sync pips, begin tone, phasing noticeable.
28th January 2013 - JJC 22542khz ending 1824EDT (UTC +11) Fishing Chart (partial). 28th January 2013 - 9VF 16035khz ending 1824EDT (UTC +11) Kaiun-Suisan News (disturbed - Fldigi chose to “freeze” for a bit, do not understand why). In this transmission, you can simply hardly spot the start of the fax, and after that the sync margins end up being clearer, and after that the signal varies … vertical banding is regional disturbance.
And simply for information, no, sadly I can not check out Japanese … however I do take pleasure in viewing the proliferation conditions aesthetically evaluating by the picture of the fax - and I do take pleasure in DXing signals, although I remain in a loud developed location. I had actually tried to reach Kyodo prior to for QSL however unsuccessfully - so I am attempting once again. I would enjoy it more if I remained in a radio background-quiet location.
In 2010, I went to my Papa's location - and utilizing simply a longwire, attained much far better outcomes (utilizing MultiPSK for translating too). There's no other way I can do the very same at my Mum's location - even utilizing a magnetic loop antenna to lower disturbance!
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