Tuesday, June 15, 2021

NASB 2021 Scheduled for September at WEWN

The NASB 2021 Annual Meeting will be Thursday and Friday, September 9 & 10, in Birmingham, Alabama. The meeting will be held at the WEWN transmitter site. Suggested arrival on Wednesday as the meetings will start early Thursday morning. 

WEWN will provide transportation between the hotel and the transmitter site, and also for the optional excursion to the Shrine of the Most Blessed Sacrament in Hanceville on Friday afternoon.  

Here is the updated info. I'm already booked so see you there!  

Thursday, April 1, 2021

CNR DRM test schedule posted

While not particularly new information, we have confirmation of times and frequencies as well as a few things to be watching for. Undoubtedly this is why it has been reported that Gospell is in full production mode for their new receivers.

Via World of Radio, Takahito Akabayashi posted his findings from the following 

Original source: https://cahcn.github.io/drm/

 2055-1805 6030 0 degrees 3FF (except Tue 0600-0900)
 0100-0900 13825 175 degrees 3EA

 0100-0900 11695 41 degrees 3E8
 0100-0900 17700 16 degrees 3ED

 0100-0400 15180 32 degrees 2
 0400-1100 13810 32 degrees 2

 0000-0400 9420 203 degrees 1
 0400-1000 7360 203 degrees 1
 1000-1200 9870 203 degrees 1

 2200-0100 9655 98 degrees 3EC
 0100-0800 17830 98 degrees 3EC
 0800-1200 9655 98 degrees 3EC

Power listed as 30kW 

Additional test transmission using the HFCC registered CRI frequencies of Kunming transmitter site. Power 30kW, 135 degrees, transmission identification code 3F9.

 0100-0300 9730
 0700-0900 12030
 0100-0500 12090
 0300-0500 13655
 0500-0700 13715
 0700-0900 13775
 0500-0700 15615

Monday, March 15, 2021

New StarWaves DRM receiver spotted

No info beyond what is here. We reported awhile back that there would be some StarWaves product to come. This one may hit the magic USD 50 mark at some point. Time will tell!

Wednesday, March 10, 2021

RedwoodComm RWC2010B Digital Radio Tester

I had the pleasant opportunity to spend an hour on Zoom with Kevin Park and Darby Cho, Principal Engineers of RedwoodComm. 

From their website:

"RedwoodComm is a professional developing company for wireless communication test solution. RedwoodComm develops and provides measurement system for R&D, mass-production of broadcast system and wireless communications such as DAB, DRM, RDS, NFC, BT and LoRa. We will keep making every effort to be the best company of test & measurement system based on technical know-how and experience of test & measurement system for wireless communications."

Awhile back, I discovered their RWC2010B Digital Radio Tester online. After making contact, Darby set up a Zoom meeting. The tester unit is a powerful DRM/DRM+, DAB, DAB+, AM/FM, RDS/RDBS receiver testing device. It handles all the DRM settings and functions as well as the ability to test the new xHE-AAC codec.

You can quickly see its features on their YouTube playlist. In the presentation they gave for me, the unit was paired with the Gospell GR-216 receiver. Adjustments to the DRM parameters are easy to perform. I was impressed at how quickly the radio would switch to the  new settings. 

The RWC2010B is a flexible device for receiver testing but also a great way to demonstrate the various settings and configuration options of DRM. I can easily see how hardware or software developers, equipment manufacturers or broadcasters could easily test and demonstrate the highly adaptive DRM platform. In the near future, I hope to be able to post more details and some hands-on reviews. 

If you are interested in more information, you can email them an inquiry or use their information form

Thursday, December 31, 2020

AlgorKorea creates innovative DRM solutions

After having seen some DRM enthusiasts posting reception reports using the AlgorKorea’s DRM receiver software, I reached out to its CTO Dr. Soon Jarng for an interview.  

Tell us a little bit about yourself:

I got a bachelor's degree in electronics engineering from Korea, a medical master's degree in physiology from the UK and a doctorate degree in electrical and electronic engineering from the UK. I have been a professor of electronic engineering for more than 26 years at the engineering college in Korea, and am now focusing on the development of digital signal processing algorithms for hearing aids and firmware for microchips in the US.

What is your inspiration?

The desire to spread the gospel of Christ to the world through broadcasting was the motivation for the study, and the program is being developed with the talent and curiosity that God provides every day.

Please tell us more about AlgorKorea:

While serving as a professor in Korea, I had an opportunity to promote hearing aid research & development and commercialization, and I founded a company (AlgorKorea) and experienced extensive experience in manufacturing and selling hearing aids. After retiring as a professor and moving to the United States, I changed the type of hearing aid manufacturing and sales to the type of hearing aid core firmware and app development.

It is a type of business that supplies software to manufacturing companies that need hearing aid firmware and apps that we develop.

I had some knowledge of digital communication theory from my experience teaching communication engineering in the Department of Electronics Engineering. At the same time, continuous research was conducted on FM (Frequency Modulation) hearing aids and speech recognition/translation/synthesis as special hearing aids required for people with profound hearing loss or deaf.

How did you get involved in DRM application development?

After hearing that the Gospel is broadcasted all over the world through KTWR, we are volunteering that anyone who have a smartphone/PC and an RTL-SDR dongle to use free DRM decoding app (DRM+ SDR, DRM+ FM) or PC program (DRM4WIN). We want more than 600 million people around the world to listen and watch Christian broadcasts through our free app. In addition, in order to avoid the problem of paid patent license of DRM technology, OPUS encoder/decoder is used instead of the existing AAC encoder/decoder. To realize the OPUS encoder in the DRM field, a separate DRM content server called DRMTX4WIN (for PC) has been developed and distributed for free.

Instead of the existing FM hearing aids that deliver sound only in alternative schools for the deaf/hearing impaired, DRM broadcasting and reception technology has been applied as an effective method of delivering text, pictures, files, and the web in addition to sound.

Tell us about your software applications:

In 2019, we mainly developed smartphone apps (DRM+ SDR, DRM+ MSi, DRM+ FM) for receiving DRM broadcasts, and in 2020, intensively developed PC versions of DRM content server (DRMTX4WIN) and reception program (DRM4WIN).

DRM content server (DRMTX4WIN) is a program that generates DRM signals by inputting audio, text, pictures, files, and web, and receiving program (DRM4WIN) decodes DRM signals to sound, text, picture, file, and web.

Our DRM receiving app (DRM+ SDR, DRM+ MSi) can decode HE-AAC, xHE-AAC compressed signals, but the newly developed DRMTX4WIN, DRM4WIN and DRM+ FM apps only use OPUS encoding (compression) and decoding (decompression) function.

Although HE-AAC and xHE-AAC decoding technologies are already secured, if these technologies are used, the problem of patent licenses prevents DRM apps from becoming free and spreading all over the world. As a result, only OPUS decoding technology is being applied.

This is because, when considering consumers around the world, most consumers prefer free apps. DRM standard came out as a means to replace the existing analog radio broadcasting with digital radio broadcasting, but in the basic specification of compression and decompression of audio, the barrier of patent license is preventing the globalization of DRM broadcasting.

While conducting DRM-related research, DRM broadcasting technology can be applied not only to alternative FM hearing aids, but also to remote broadcasting education in areas where the Internet is not available. In addition to analog communication, digital communication can be applied to send and receive texts and files among amateur ham radio individuals.

What about your plans for DRM broadcast testing?

With this possibility in mind, we are planning to apply for the FCC's license in 2021 for pioneering educational broadcasts on the JAMA campus.

Can you give a brief description of JAMA and your connection to it?  

JAMA stands for Jesus Awakening Movement for America and aims to establish and operate a college that fosters Christian leaders. I am only praying for JAMA and there is no special connection. I've met the founder of JAMA several times. I want to try distance education through DRM broadcasting in Christian institutions such as JAMA, schools, churches, and organizations. DRM does not have a wide frequency band like DAB, so it has a limited transmission rate, but it can transmit text and files in addition to sound through an FM transceiver of a narrow frequency band, so it is expected to be used in areas without the Internet.

How can DRM enthusiasts and experimenters access your software and apps?

If you would like to know any other information about us, please send us your questions. DRM4WIN can be found here.

Thank you Dr. Soon Jarng for for an interesting and informative interview. I look forward to further DRM progress from AlgorKorea.