AT-D168UV and MMDVM in Japan: The “Intra-Station Communication” Issue and My Plan

AT-D168UV and MMDVM in Japan: The “Intra-Station Communication” Issue and My Plan

I recently bought an AnyTone AT-D168UV and plan to use it with an MMDVM hotspot for DMR and other digital modes. In Japan, radios that are not type-approved here (including imports like the AT-D168UV) must be registered with the Ministry of Internal Affairs and Communications in a special way before use. I’m going through that process and want to share the situation and my approach.The “intra-station communication” problemIn Japan, a view has spread online that MMDVM hotspots count as “intra-sta...

2026.02.28

VoIP

The Story of SOTA JA/NR-057 Mt Hatafuriyama

Summits on the Air (SOTA) JA/NR-057 Mt Hatafuriyama is the second most popular summit in the world, following G/SP-015 The Cloud in the UK. To date, the activation count is 2,062.Hatafuriyama is a Chinese character meaning "flag-waving mountain." True to its name, flags were waved from the summit of Hatafuriyama. This was a form of communication known as "flag-waving communication."During the mid-Edo period (18th century), rice prices in Japan were determined based on the rice market price in Os...

2025.12.26

Mountain portable

Failed communication with a station using a Doggie antenna

My QTH is located at the bottom of a valley between mountains. I operate on 70cm band, so I rarely hear CQ calls. However, I occasionally hear CQ calls from mountain mobile stations. Incidentally, there is no activity on 2m band at my QTH.Yesterday, Tuesday, December 2nd, I heard one such CQ call from JS3MXP at an altitude of 645 meters on Mt Rokko, 45 km from my QTH.From an altitude of 645 meters on Mt Rokko, my QTH could not receive direct waves, only mountain diffraction waves, so the signal ...

2025.12.03

Mountain portable

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2025.11.24

Uncategorized

Kazushi JQ3BMR