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Thursday, May 21, 2020

KTWR DRM Schedule Update (21 May 2020)




Our Chinese DRM broadcast is moving to Saturday beginning on 23 May and changing frequency.  This will hopefully make it accessible to more listeners.

Day               Time (UTC) Frequency    Region    Language
Sunday          1026-1056    15200 kHz   India       English
Sunday          1245-1315     7500 kHz    Japan      Japanese (Starting 3 May 2020)
Saturday        1057-1130     9910 kHz    China      Mandarin/Cantonese

We greatly appreciate your reports on link quality and program content to ktwrdrm@twr.org.

Friday, April 24, 2020

KTWR DRM Schedule Update (3 May 2020)

Day               Time (UTC) Frequency    Region    Language
Sunday          1026-1056    15200 kHz   India       English
Sunday          1245-1315     7500 kHz    Japan      Japanese (Starting 3 May 2020)
Wednesday    1026-1056     11995 kHz  China      Mandarin/Cantonese

We greatly appreciate your reports on link quality and program content to ktwrdrm@twr.org.

Sunday, February 16, 2020

KTWR DRM Schedule Update (16 Feb 2020)

Day               Time (UTC) Frequency    Region    Language
Sunday          1026-1056    13800 kHz   India       English
Wednesday    1026-1056     9910 kHz   China      Mandarin/Cantonese

We are planning to restore a weekly broadcast in Japanese in the near future.

We greatly appreciate your reports on link quality and program content to ktwrdrm@twr.org.

Friday, November 29, 2019

KTWR Dual Language!

The First successful decode of Dual Language DRM 30 to Japan and Korea took place today (28 November) on 7500khz from 1228 to 1244 UTC.

Verified by a listeners in Takaoka City Toyama Pref. and  Odate-shi Japan
https://youtu.be/jebYT5L_OCQ

The Dual Languages were enhanced by live text describing the Japanese program and two additional data services featuring slide pictures as well as a test Journaline feed.   A total of 4 services were sent from one transmitter!

We decoded the services on PC + SDR, Tecsun Q-3061 receiver and Smartphone + SDR at the transmitter site in Merizo Guam.





Friday, November 22, 2019

Convert SmartPhone to DRM 30 HF receiver!

Convert Smart Phone to DRM 30 HF receiver!

We are pleased to report successful use of an SDR Dongle used to directly receive and Decode DRM 30 over HF today.

The SDR Dongle is an RTLSDR v3 type connected to an android smartphone using an OTG cable (phone or tablet must be OTG capable).

The Software used:
1. Android driver (free)
2. DRM+SDR Android App ($4.99)

The Frequency of the HF broadcast is directly assigned within the DRM+ SDR app with two settings
1. Frequency in Hertz
2. RF Gain (0-512)

Demonstration video showing Clean DRM decode of AAC Audio and Journaline data along with live metadata.  (our signal was very strong, so only a short wire used for Antenna, DX'rs will need an appropriate Antenna)

** Updated 01/28/2020, SDRPlay type SDR has been added 

Now anyone with a smartphone and a $20 SDR can receive DRM 30 HF broadcasts...


The new KTWR DRM schedule became effective 27 October
** updated 01/28/2020

 Day                        Freq                       Time                                      Region                             Power

Wednesday          9910kHz             1026-1056UTC                    China                                    50kW
Thursday               7500kHz             1226-1245UTC                    Japan/Korea                       50kW
Sunday                 13800kHz            1026-1056UTC                    South Asia                           90kW


Monday, September 9, 2019

Propagation Artwork

Hi Everyone,

When we published the latest KTWR DRM broadcast schedule, we did not include the expected propagation plots for the new blocks. They are shown below to give you an idea of what to expect for coverage. The South Asia plot was done for 75kW, but we will be using 90kW for this season. It should work slightly better than what is shown. The Japan/SK block will still be aired at 50kW.


9900kHz 1215-1245UTC to Japan/SK
15200kHz 1026-1056UTC to South Asia

Friday, September 6, 2019

Yet Another Change

Hi again Everyone,

We are so grateful for the help listeners have given us during the DRM broadcasts we started last month. Based on comments and listening patterns we have seen, we made some more changes to KTWR's DRM broadcast schedule. The new schedule will become effective 12 Sept. for the Japanese block and 15 Sept. for the South Asian block.

 Day                        Freq                       Time                                      Region                             Power

Wednesday        11995kHz             1026-1056UTC                    China                                    50kW

Thursday               9900kHz             1215-1245UTC                    Japan/Korea                       50kW
Sunday                 15200kHz            1026-1056UTC                    South Asia                           90kW
 
We are still trying different broadcast parameter combinations, so we definitely can use your reception reports. We believe that propagation for the new Japan/SK and South Asia broadcasts will be much better than it is with the current schedule.
 
We do hope that the content of the programs has been a blessing to you. We are looking for ways to replace the English language programs with Asian languages in the future. We do not know when that will happen. Stay tuned and 73.