Schedule Change

We hope you have been enjoying participation in our DRM experiment. We are grateful for those of you who have sent reception data to us. We had a request to move the South Asia block from Monday to Saturday. This is to allow more listeners to be at home during the broadcast time. We have received authorization to make that change. Starting tomorrow, 24 August, the DRM broadcast schedule will be as follows:

 Day                        Freq                       Time                                      Region                             Power
Tuesday               11995kHz             1026-1056UTC                   ANZ/South Pacific              50kW

Wednesday        11995kHz             1026-1056UTC                    China                                    50kW

Thursday             11995kHz             1026-1056UTC                    Japan/Korea                       50kW

 

Saturday              11580kHz             1215-1245UTC                   South Asia                           90kW

 

For the remaining weeks in this 8-week broadcast cycle, the audio bit rates will be lower than before. That should make decoding easier.

 

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DRM Decoding App!

If you would like to lighten the load of your DRM reception hardware, you could off load the work of decoding with a new Android based DRM decoding App.

'DRM30' FREE

https://play.google.com/store/apps/details?id=com.algorkorea.app.drm1

'DRM+' $1.99

https://play.google.com/store/apps/details?id=com.algorkorea.app.drmplus

Although air coupling the demodulated DRM Audio between the receiver speaker / headphone and the microphone input of the Smartphone / Tablet will work to some degree.  Likely ambient noise will be introduced causing the decoding to be less than ideal.  Holding the smartphone microphone near the demodulated DRM output is a quick way to check the SDC.  A direct cable or even a filtered line may be needed to decouple Phone / PC / Receiver noise for a solid MSC and audio decode.

If you use a headphone / microphone multi pole plug (like the diagram below), the decoded DRM audio will automatically route to the Headphone jack, so an Audio Switching App (many available on google play store) can be used to route audio to the main speaker of the phone.

 Let us know if you use this in your tests... And how it works...

More DRM Reception Info

It occurred to us that you may want to see what to expect for coverage of our various DRM broadcasts. I am including propagation plots for September. Some months may be better than others, especially for India and New Zealand.

South Asia broadcast

 

Australia/New Zealand broadcast

China broadcast

Japan/South Korea broadcast

Here are some tips that may help you in picking up our broadcasts. If you live in an area where the signal is weak, you may want to consider turning off nearby CFLs or LED lights to reduce electrical noise. If you are using an SDR with selectable filters, a 12kHz filter usually works better than a 10kHz filter.