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Search: Posts Made By: zfyoung
Forum: Reception Results - Recent Posts 26-12-2018, 08:15
Replies: 8
Views: 563
Posted By zfyoung
Received on 15735 kHz. This test is really...

Received on 15735 kHz. This test is really stretching the DRM standard to the limit: 14.56 kbps = AAC + SBR(12kHz bandwidth) + P.stereo. Very special config. indeed!
Forum: Reception Results - Recent Posts 25-12-2018, 12:53
Replies: 19
Views: 950
Posted By zfyoung
Reception via KiWiSDR in Fukushima, JAPAN. Barely...

Reception via KiWiSDR in Fukushima, JAPAN. Barely strong enough for audio decoding.
Forum: Reception Results - Recent Posts 22-12-2018, 12:07
Replies: 19
Views: 950
Posted By zfyoung
Thumbs up Again via KiWiSDR in Tokyo, Japan. Very strong...

Again via KiWiSDR in Tokyo, Japan. Very strong and stable signal for the whole test session. Perfect audio decode despite the adjacent channel interference.:)
Forum: Reception Results - Recent Posts 16-12-2018, 13:28
Replies: 19
Views: 950
Posted By zfyoung
An informal reception via KiWiSDR in...

An informal reception via KiWiSDR in Lanzenhäusern, Switzerland. Good signal and good audio, but poor freq choice due to interference from lower 5KHz AM broadcast from 1300 UTC.
Forum: General Topics 01-12-2018, 01:13
Replies: 286
Views: 92,844
Posted By zfyoung
https://www.iis.fraunhofer.de/en/pr/2018/20180608_...

https://www.iis.fraunhofer.de/en/pr/2018/20180608_AME_Android.html

This link may be of special interest to potential implementations of xHE-AAC decoding function for DReaM. :cool:
Forum: Reception Results - Recent Posts 18-10-2018, 13:07
Replies: 2
Views: 426
Posted By zfyoung
Well...That's what I'm told. If there is any...

Well...That's what I'm told. If there is any doubt, I guess you can just ID the TX site by using direction finding tools, e.g. KiwiSDR TDoA
Forum: Reception Results - Recent Posts 18-10-2018, 09:40
Replies: 2
Views: 426
Posted By zfyoung
Smile China National Radio New DRM test frequency

From Oct.23th onwards, CNR will increase its DRM test freq as follows:

15580 kHz, 01:00-09:00 UTC daily, service area: North East China
11695 kHz, 01:00-09:00 UTC daily, service area: East and South...
Forum: Reception Results - Recent Posts 15-10-2018, 05:15
Replies: 2
Views: 566
Posted By zfyoung
Got it via KiwiSDR. Unstable signal with wildly...

Got it via KiwiSDR.

Unstable signal with wildly variable field strength. It seems generated from a good quality Tx station. I have the suspicion the encoded bit stream is purposely scrambled to...
Forum: Reception Results - Recent Posts 28-09-2018, 01:41
Replies: 20
Views: 2,826
Posted By zfyoung
Don't know if you've successfully decoded the...

Don't know if you've successfully decoded the FAC/SDC stream. I noticed their signal spectrum has to be flipped to be recognized properly by Dream in contrast to other broadcasters.Their SNR plot...
Forum: Reception Results - Recent Posts 20-09-2018, 10:47
Replies: 9
Views: 1,454
Posted By zfyoung
Both services are at the same bit-rate. As far as...

Both services are at the same bit-rate. As far as I can see the only difference is UEP and EEP (Unequal Error Protection / Equal Error Protection). Theoretically, UEP should be more robust(ie. less...
Forum: Reception Results - Recent Posts 29-08-2018, 14:02
Replies: 1
Views: 561
Posted By zfyoung
AIR on 15040kHz jammed by CNR

Don't know if AIR is aware of fact that their DRM transmission on 15040kHz to South China is jammed by CNR.:( Not enjoyable listening experience due to too many audio disruptions. Could they change...
Forum: Reception Results - Recent Posts 26-07-2018, 02:18
Replies: 107
Views: 10,933
Posted By zfyoung
Nice detective work! Considering the heavy...

Nice detective work! Considering the heavy multi-path character of propagation condition typical for this meter band.
Forum: Reception Results - Recent Posts 25-07-2018, 01:55
Replies: 107
Views: 10,933
Posted By zfyoung
The tip-off did not provide the info. about the...

The tip-off did not provide the info. about the Tx location. On the other hand, you can detect the whereabouts by conducting HF direction finding via KiWi TDoA. Some enthusiast has applied that...
Forum: Reception Results - Recent Posts 23-07-2018, 15:28
Replies: 107
Views: 10,933
Posted By zfyoung
According to some insider info. The schedule is...

According to some insider info. The schedule is from 20:25 to 18:05 (UTC). Main service area is North East China. Central and East China should also get good coverage.:cool:
Forum: Reception Results - Recent Posts 09-06-2018, 02:05
Replies: 171
Views: 15,967
Posted By zfyoung
Maybe the other non-DRM part is some kind of...

Maybe the other non-DRM part is some kind of digital mode(MFSK, PSK....) akin to the VOA Radiogram?
Forum: Reception Results - Recent Posts 05-06-2018, 02:24
Replies: 171
Views: 15,967
Posted By zfyoung
Thumbs down I'm afraid whether VOACAP can predict various DRM...

I'm afraid whether VOACAP can predict various DRM transmission coverage is moot here. Even the field strength at receiver site is NOT the determinate factor of a successful DRM reception.

From my...
Forum: Reception Results - Recent Posts 31-01-2018, 01:29
Replies: 4
Views: 1,246
Posted By zfyoung
Talking According to some sources: 9830 KHz from 20:25...

According to some sources:

9830 KHz from 20:25 UTC to 02:00 UTC

17565 kHz from 02:00 UTC to 07:30 UTC

9830 KHz from 07:30 UTC to 18:05 UTC

Short term test schedule highly possible. So tune in as...
Forum: Reception Results - Recent Posts 30-01-2018, 03:41
Replies: 4
Views: 1,246
Posted By zfyoung
Cool ChinaNationalRadio test on 17565KHz

Capture the CNR test broadcast on 17565KHz at 03:00 UTC.

Signal is very strong in South China. Not sure of its ERP.
Forum: Reception Results - Recent Posts 19-01-2018, 13:04
Replies: 18
Views: 2,451
Posted By zfyoung
This is the screen capture of the web browser,...

This is the screen capture of the web browser, not sure if it is useful.

BTW, I don't know what happens to the Dream software this time. Why the robust mode and bit-rate in the log not updated...
Forum: Reception Results - Recent Posts 19-01-2018, 09:27
Replies: 18
Views: 2,451
Posted By zfyoung
Rock solid in India via kiwiSDR throughout 30...

Rock solid in India via kiwiSDR throughout 30 mini. They should stick with robust mode A as yesterday since the length of impulse response is well within limit of mode A.

Again,
Forum: Reception Results - Recent Posts 19-01-2018, 00:41
Replies: 18
Views: 2,451
Posted By zfyoung
Oh, thanks Terje! That makes it a clean and nice...

Oh, thanks Terje! That makes it a clean and nice presentation.
Forum: Reception Results - Recent Posts 18-01-2018, 09:22
Replies: 18
Views: 2,451
Posted By zfyoung
Logging through KiwiSDR: I have no plotting...

Logging through KiwiSDR: I have no plotting tools, so I have to attach with the raw log file for any one interested to have a look.

Note: the first section(from start to 8:36 UTC ) is via receiver...
Forum: General Topics 16-11-2017, 01:48
Replies: 67
Views: 22,141
Posted By zfyoung
This synthetic picture should give you a rough...

This synthetic picture should give you a rough idea of ,depending on the distance between TX and RX.
As what I've said, the best coding scheme should have the sensual analogue form while in spirit,...
Forum: General Topics 14-11-2017, 00:49
Replies: 67
Views: 22,141
Posted By zfyoung
If you confine yourself within the 'rule box' of...

If you confine yourself within the 'rule box' of current DRM standard, then the answer is a resounding NO. That's why I said . But it does't mean you have to throw out the baby with dirty bath...
Forum: General Topics 13-11-2017, 01:23
Replies: 67
Views: 22,141
Posted By zfyoung
This is the only short term stopgap solutions to...

This is the only short term stopgap solutions to the HF broadcast problem.
Actually the main complaint I have against DRM is that the codec (AAC+/xHE) remains proprietary product. This not only put...
Showing results 1 to 25 of 235

 
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