JMH/JMH2/JMH4 are a set of radiofax stations transmitting from Tokyo, Japan. They had many more transmitters formerly – hence the “gaps” in the numbering, luckily they haven’t discontinued the service altogether.
Transmissions are all made at 5kW, and all three frequencies (center) at 3622.5khz, 7795khz and 13988.5khz have been heard from Sydney, Australia. Generally, the 7795khz is the best frequency, with 13988.5khz only available for limited periods, and 3622.5khz is severely affected by noise and static.
Unfortunately, I haven’t been able to find any contact at JMA for QSL requests – so I won’t get a QSL for this one, but that’s okay. Receiving the images are most of the fun anyway! Transmissions consist of white-tone for tuning, followed by a short start tone, then regular phasing. During the image, the margin is negative (black), and end of transmission is marked by a short stop tone followed by black for about 5 seconds.
Lets start off with the “unusual” faxes. Time will be given in local time (UTC+11) for the end of the fax. All reception done on JMH2 at 7795khz.
Test Fax – 6th Feb 2013 ending 0010
Test Fax – 7th Feb 2013 ending 0009
Test Fax – 8th Feb 2013 ending 0009
This is a test fax – note how over the case of several days, the propagation is completely different and the quality of the fax varies significantly! I guess it reinforces the need to be patient and persistent if you want to get a good copy!
Trouble Fax – 5th Feb 2013 ending 0403
Normally a rare sight – these are trouble faxes which are sent when there’s something wrong with the system. In fact, I was able to receive three of them – but I’ve put the two clearest ones up here.
Surface Analysis – 5th Feb 2013 ending 0158
Sea Surface 100m Temperatures – 6th Feb 2013 ending 0135
Unknown – Pairs of Charts 1 – 8th Feb 2013 ending 0450
Unknown – Pairs of Charts 2 – 8th Feb 2013 ending 0521
Unknown – Pairs of Charts 3 – 8th Feb 2013 ending 0532
Unknown – Pairs of Charts 4 – 8th Feb 2013 ending 0543
MTSAT Satellite Image – 6th Feb 2013 ending 0627
Mean Sea Surface Temperatures – 6th Feb 2013 ending 0315
Ice Conditions – 6th Feb 2013 ending 2138
Unknown – Four Charts – 7th Feb 2013 ending 0608
48h Surface Prognosis – 7th Feb 2013 ending 2118
24h Wave Forecast – 7th Feb 2013 ending 2259
24h Wave Forecast – 7th Feb 2013 ending 0648
Wave Analysis – 7th Feb 2013 ending 2328
Unknown – 7th Feb 2013 ending 2059
Unknown – 5th Feb 2013 ending 2138
Which covers all of the different sorts of charts that I have seen when monitoring JMH stations.