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Search: Posts Made By: zfyoung
Forum: Reception Results - Recent Posts 09-06-2018, 01:05
Replies: 82
Views: 2,811
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, 01:24
Replies: 82
Views: 2,811
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, 00:29
Replies: 4
Views: 659
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, 02:41
Replies: 4
Views: 659
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, 12:04
Replies: 18
Views: 1,089
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, 08:27
Replies: 18
Views: 1,089
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 18-01-2018, 23:41
Replies: 18
Views: 1,089
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, 08:22
Replies: 18
Views: 1,089
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, 00:48
Replies: 64
Views: 17,042
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 13-11-2017, 23:49
Replies: 64
Views: 17,042
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, 00:23
Replies: 64
Views: 17,042
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...
Forum: Reception Results - Recent Posts 10-11-2017, 09:41
Replies: 227
Views: 11,373
Posted By zfyoung
Yes, you are almost there. Simply put it: remote...

Yes, you are almost there. Simply put it: remote receiver, local decoder.

As Digger said, you need good network connection between remote server and your local PC. If there is any IQ data dropped...
Forum: Reception Results - Recent Posts 09-11-2017, 11:59
Replies: 227
Views: 11,373
Posted By zfyoung
Just select ANY SDR that is vacant (kiwiSDR has a...

Just select ANY SDR that is vacant (kiwiSDR has a limit on number of simultaneous loggers for each device). In my case, I just select it randomly (and it happens to be in Greece). I think any...
Forum: Reception Results - Recent Posts 05-11-2017, 11:45
Replies: 227
Views: 11,373
Posted By zfyoung
Thumbs up I don't think this "kiwiSDR" has any...

I don't think this "kiwiSDR" has any relationship to the forum member Chris (owdjim) as you suggested, even though they both are probably from New Zealand.

Anyway, I provide the link to kiwiSDR...
Forum: Reception Results - Recent Posts 05-11-2017, 09:57
Replies: 227
Views: 11,373
Posted By zfyoung
receive from kiwiSDR through the web

Just in case anyone want to receive DRM broadcast via the web, I just manage to record this screen shot from kiwiSDR, reception location Greece.

Nice feature from SDR and very good reception quality...
Forum: General Topics 17-09-2017, 03:33
Replies: 6
Views: 2,604
Posted By zfyoung
Wink Actually, quite simple: 2 sample channels and...

Actually, quite simple: 2 sample channels and recorded in ".WAV" stereo format in left and right channel. That's it!

For optimal performance, of course, more channels, more robust signal. I would...
Forum: General Topics 15-09-2017, 03:39
Replies: 6
Views: 2,604
Posted By zfyoung
Smile Need your help in experimenting DRM diversity reception!

I know this is an idea that has been floating around for quite a long time, but no one seems to bother to try to make some experiment or progress in that respect.

Anyway, since Tx side diversity...
Forum: General Topics 27-08-2017, 08:52
Replies: 104
Views: 37,159
Posted By zfyoung
Cool Hear! hear! Why the DRM signals on the air is...

Hear! hear! Why the DRM signals on the air is still so few and far between in the AM band after decades of 'testing'. If most DRM capable Tx site just send out their DRM signals at a quarter(or a...
Forum: General Topics 27-08-2017, 08:27
Replies: 8
Views: 821
Posted By zfyoung
That says so much of the professional competence...

That says so much of the professional competence of their broadcast engineers. I can't imagine what would happen if when they 'randomly' set the emergency early warning messages (earthquake, tsunami,...
Forum: General Topics 14-08-2017, 09:32
Replies: 8
Views: 821
Posted By zfyoung
I don't get the point here: The time code (sent...

I don't get the point here: The time code (sent via ether )only has valid meaning when it is associated with specific time zone (which should be an integral part of the time code info. embedded in...
Forum: Reception Results - Recent Posts 26-06-2017, 01:16
Replies: 67
Views: 23,602
Posted By zfyoung
Thanks, Terje. I should have figured it out by...

Thanks, Terje. I should have figured it out by looking closely at the IR length: for half of the time, it shot up to 10ms which is already beyond the capture range of robust mode B. Having said that,...
Forum: Reception Results - Recent Posts 25-06-2017, 04:04
Replies: 67
Views: 23,602
Posted By zfyoung
Why did the number of successfully decoded frame...

Why did the number of successfully decoded frame vary in zigzag like fashion? Local interference?

zfyoung
Forum: Reception Results - Recent Posts 06-04-2017, 13:37
Replies: 30
Views: 3,682
Posted By zfyoung
After a look over the latest version of DRM...

After a look over the latest version of DRM standard, I can almost be sure the second stream is indeed AAC-xHE. In the latest version of standard, the SDC entity type 9 append new data field:codec...
Forum: Reception Results - Recent Posts 04-04-2017, 14:13
Replies: 30
Views: 3,682
Posted By zfyoung
Hi, after some close inspection of the DRM signal...

Hi, after some close inspection of the DRM signal in the ".wav" file sent to me by MARCEL, I can successfully decode the first arabic language stream. But the for the second french stream, SDC sets...
Forum: Reception Results - Recent Posts 03-04-2017, 03:40
Replies: 30
Views: 3,682
Posted By zfyoung
MARCEL, your file is decoded audio file. Can you...

MARCEL, your file is decoded audio file. Can you provide the IF(intermediate frequency) record file in '.wav' format? That would be of great interest to me, thanks!

zfyoung

regard
Showing results 1 to 25 of 221

 
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