Showing posts with label Japan. Show all posts
Showing posts with label Japan. Show all posts

Sunday, November 26, 2023

Mystery Asian DRM signal on 927 kHz

UPDATE 202301127: @fractional_n posts - "Probably North Korea.

The North Korean station at 6140kHz also had an ID=64."


From @fractional_n (located near Tokyo) on Twitter:

(Machine translated from Japanese) "From last night's medium wave record

I discovered that DRM waves are being emitted at 927kHz!

Although NHK Kofu Daiichi is strong, the SNR increases to a maximum of 8 dB. ID=64 and no station name label is displayed. However, the contents of the data cannot be demodulated. It seems that the data format cannot be decoded by Dream.

It is speculated that it probably originates from China or North Korea."

Any ideas?

Wednesday, August 21, 2019

Special DRM Broadcasts for HFCC 2019 in Buenos Aires, Argentina


HFCC conveners had hoped for more, but here are a few DRM broadcasts targeting the HFCC 2019 meeting in Buenos Aires, Argentina.

Transmission will originate by Encompass Digital Media Services on Ascension Island. All days are 16.00-17.00 UTC on 21630 kHz bearing of 245 degrees. Four different content providers will air, one each day.
  • Monday 26 August – BBC World Service [English]
  • Tuesday 27 August – KBS World Radio (Korea) [Spanish]
  • Wednesday 28 August – NHK World Radio (Japan) [Spanish]
  • Thursday 29 August – TWR (TransWorldRadio) [Spanish]

In addition, Vatican Radio will also carry a special broadcast in DRM during the HFCC meeting. Monday 26-Thursday 29 August at 18.30 -19.00 UTC on 17535 kHz from Santa Maria di Galeria bearing of 230 degrees. Program will consist of music with text in English and Spanish.

Rumors of new DRM receivers are in the air. I'm anticipating reports from the meeting soon. Stay tuned!


Sunday, May 24, 2015

DRM developments at NASB 2015 in Washington DC


I have just returned from an excellent two days at NASB 2015 in Washington DC, hosted by RFA with on-site host Al "A.J." Janitschek

I was pleasantly surprised by the volume of DRM30 discussion this year. North American shortwave broadcasters are ready for DRM!




It was the 25th annual meeting of the NASB so Continental helped us celebrate with cake!

Specifically, there were three talks that featured DRM prominently. Below are just a few of the overall conference highlights:

Lauren Libby, President of TWR gave an impassioned plea for DRM receivers and for us to look to DRM for the future of international shortwave broadcasting. TWR trialed a DRM feature to Japan on KTWR Guam where they received a positive response from Japanese enthusiasts. 

On Friday, Cal Carter of Continental Electronics presented updates from the DRM consortium including the current status of the large scale Indian initiative as well as positive momentum in the Asia-Pacific region, Brazil and Southern Africa.







Of course, I took a crack at sharing the excitement by presenting my experience as a listener and logger. I enjoyed showing examples and playing audio from the user's perspective. I explained and demonstrated the strengths of DRM using Terje's DRM-Log Plotter software. My slides here and the audio clip here. I presented a reception time-capsule video at NASB 2014 which you can view here. Thanks to Terje for the great DRM-Log Plotter handout.

Here is a music sample from RNZI, recorded via DRM at my home in Oregon. That is about 7000 miles from their 25kW transmitter and received on my Newstar DR111 using an alligator clip-lead to a basement drain pipe as an antenna. Isn't DRM amazing?

We were very fortunate to have Jerome Hirigoyen in attendance from TDF. Their site in Issoudun, France currently has 2 high-power DRM transmitters in operation.
Dr. Kim Andrew Elliott presented VOA Radiogram and encouraged broadcasters to participate in the Radiogram initiative. VOA Radiogram is a weekly program whereby textual news with images can be transmitted on traditional, unmodified shortwave transmitters and likewise received using off-the-shelf, unmodified shortwave radios.

Gerhard Straub from IBB gave a worldwide update about their broadcast sites. Gerhard also indicated there will be an RFP out soon to develop an end-user app for decoding VOA Radiogram on smartphones and tablets. More info to follow on this exciting development!





During the NASB business meeting, the conversation got very interesting. A significant number of the broadcaster members showed interest in using DRM (sooner rather than later) and working together to make affordable receivers (USD 50 or under) available. This conversation was augmented by audience members including Ludo Maes from Broadcast Belgium and his extensive DRM knowledge. I was really excited to finally get to meet him, having enjoyed years of his work with TDP Radio and The Disco Palace on DRM.
I'm sure that attendees will agree, this was an enjoyable and informative gathering. For me the opportunity to "talk shop" with shortwave broadcasters and enthusiasts is unsurpassed. To those I met for the first time and for those I have known, it was my great pleasure to be in attendance.
As I flew home, I snapped this gorgeous view of Mt. Hood near Portland, Oregon. It was a perfect way to sum up my trip - "the sky is the limit" for DRM in North America. I would like to thank the NASB, RFA and all those in attendance for making this such a great conference. Special thanks go to Dr. Elliott for serving as my local host. It made my trip even better!

Monday, November 11, 2013

Great Japanese DRM site

There are lots of DRM reception reports (mostly on a Perseus) from Japan. I ran it through Google Translate here so enjoy! I'm calling it DRMJA!

I know nothing about the author (other than his name - Hiroshi) but notice that he links to DRMNA. I think DRM enthusiasts worldwide need to work together to share our passion and spread the word!

Tuesday, May 21, 2013

KTWR Guam DRM Test - 24/25 May

KTWR, Guam is planning a DRM test to Japan for May 24th and 25th. It will be on 15570 at 1230-1300 UT. 
The language will be Japanese. While we are really hoping that Japanese SWLs and radio clubs get involved in this test, reports on the side and back lobes would also be appreciated. 
We will be beaming at a heading of 335 degrees. We will be running 75 kW, so that Japanese listeners in Russia and the EU can tune in as well. 
We should have good side lobes into Southeast Asia and possibly India. The main beam should be quite strong in Europe. The main back lobe will be toward NZ .
(Mike Sabin, KTWR, May NZ DX Times via DXLD)
...Via Alokesh

Saturday, February 9, 2013

Japanese DRM fan captures Australian Test Broadcast

Read a rough translation about Hiroshi's catch. I heard nothing about this one guys, sorry. Thanks go to Terje for the tip about Hiroshi's blog.

It is unknown by me how long this broadcast was and to where it was beamed. Shown here is 1105z Monday, 21 January 2013 on 12080kHz. Looks like a crazy high bitrate, which likely hampered good decode for all but directwave listeners.  

Beer-fueled rant to follow: Why in the hell won't some DRM broadcasters "get the memo" about using a lower bitrate as audio quality trade-off for a more robust broadcast? A great compromise is to go with a lower (yet effective) bitrate such as RNZI has proven effective for transcontinental DRM... between 15 and 17 kbps!

Of course, readers of this blog know that I question why DRM is not considering or at least experimenting with the new innovations found in the very bit-rate efficient Codec2!