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Old 23-05-2010, 01:39   #1
RafaelColDRM
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RNE 9630 Khz

Hi all

At moment RNE in spanish on 9630 Khz, good signal; in // with analogue signal on 6020 KHz and 9535 KHz. Presume from Costa Rica
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File Type: jpg REE MAYO 22.JPG (60.1 KB, 503 views)
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Old 24-05-2010, 01:14   #2
drmdab
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Hi Rafael, hi all,

good catch, thanks for the post! Visible right now here in Germany but no audio at 14 dB SNR max. and strong QRM.

Very short log attached.

I wonder if they have started before 0000 UTC already.
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File Type: png reecostarica.PNG (8.2 KB, 429 views)
File Type: png log-ree-costarica.PNG (59.0 KB, 442 views)
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Old 26-05-2010, 07:15   #3
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An unattended log. High Doppler suggests that the signal originates far from here. Unfortunately, not enough decoded audio to get an automated screen-shot.
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File Type: png 9630-100525-2320-0200-HED362@CH.png (40.3 KB, 421 views)
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Old 31-05-2010, 03:22   #4
Brendan1
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30-31 May log

Well, I managed to get this log started just 5 minutes after hooking up my 'good' antenna outside after moving.

Fairly disrupted during the first hour, but much better after that. Some adjacent channel interference on 9625 at first, but at 0000Z it shifted off for the better.

Nice to have a new one in the same hemisphere!
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File Type: png 9630-100530-2348-0157-Brendan1.png (43.6 KB, 411 views)
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Airspy HF+ Discovery + SDR-Console s/w + 60m dipole
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Old 01-06-2010, 03:27   #5
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Smile 31 may - 1 June log

Today's observations: DRM carrier came up at 2346 UTC, no audio was heard until 0005 UTC. It would appear that from 2346 to 0005 the carrier was 1) either running at reduced levels, gradually increasing to full power, or 2) local sunset in Cariari (2350) played a dramatic role in changing the signal strength over the path to my location.

No audio heard after 0200, although the DRM signal was on the air until 0205 UTC. The Dream waterfall at the time was showing an amazing portrait of the ionosphere, with the DRM waveform illuminating all of the adjacent spectrum. I have a screenshot of the waterfall, but it is too big to upload.

Great audio by the way, not many 'digital' artifacts could be heard. The impulse response was running from less than 4ms to just over 5ms.
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File Type: png 9630-100531-2345-0206-Brendan1.png (43.7 KB, 379 views)
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Airspy HF+ Discovery + SDR-Console s/w + 60m dipole
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Old 02-06-2010, 03:01   #6
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1-2 June log

Today's notes: Audio started at 2358, ended at 0147. Carrier came up at 2347, and went off-air at 0149. Excellent signal strength while the broadcast was on, any decoding problems were fairly brief.

It would seem as if the Cariari station is somewhat loose about adhering to a schedule.
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File Type: png 9630-100601-2348-0149-Brendan1.png (40.2 KB, 369 views)
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Old 02-06-2010, 07:01   #7
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1 - 2 June

According to an answer from REE yesterday via e-mail that I got read: "We have planned these transmissions from 0 to 2 am UTC" (from Cariari). There was no mention of the direction of the broadcast. I am most certainly outside the target area.

My unattended log was better than my first try, but the Doppler is higher than 1 Hz all the time which results in no decoding at all according to my experience. The Channel Impulse Response is probably wide and poor as well - that's an assumption. The log is a 30 seconds interval Auto-Plot, which didn't manage to shoot any screenshots due to the absence of decoded audio. That means that I have to get up in the middle of the night to see for myself.
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File Type: png 9630-100601-2345-0150-HED362@CH.png (38.8 KB, 338 views)
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Old 03-06-2010, 03:29   #8
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2-3 June log

Well, if by starting 7 minutes early and ending 10 minutes early they mean 0000-0200, I guess they are "on time."

{IMHO, a radio transmission should be like a good Swiss train: leave at the exact second it's scheduled, not before, not after. Gotta love punctuality!}

Started at 2353 today, and ended at 0150. Audio was up about 3 minutes later.

I think the azimuth previously given for the REE broadcast was 340, which would put me very much in the path, either here or in Arizona. Given the signal quality, I think that's still the case. I didn't get a chance to check the channel impulse response here today, but IIRC yesterday it was <5ms. I'll try to check tomorrow for sure.

Today's results are extremely good all told.
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File Type: png 9630-100602-2353-0150-Brendan1.png (40.9 KB, 373 views)
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Airspy HF+ Discovery + SDR-Console s/w + 60m dipole
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Old 03-06-2010, 08:15   #9
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Then I am definitely outside the target area. And sound asleep...
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File Type: png 9630-100602-2350-0151-HED362@CH.png (43.8 KB, 345 views)
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Old 04-06-2010, 03:08   #10
Brendan1
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3-4 June log

Terje - Since when is a true DRM fan supposed to sleep? Somewhere there is always a transmission to try and log!

I checked the impulse response, and for the most part it was between 4 and 5ms. Towards the end of the broadcast I noticed that band conditions were deteriorating and it was showing a width of at least 7ms from time to time.

Not so good tonight, mostly because of a high "A" index here I think. Condtions weren't very good for most of my logs today.

The broadcast started at 2356 and ended at 0156. They're getting better at their timekeeping...
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File Type: png 9630-100603-2356-0156-Brendan1.png (46.0 KB, 307 views)
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Old 04-06-2010, 06:32   #11
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3 - 4 June

Hi Brendan and all,

Oh, my passionate DRM years are over, thats why I decided to sleep through this transmission In the 1960's I used to hunt MW DX during the winter nights.

Actually, I let Dream run through the night and the log is enclosed. The Doppler is extremely high and the SNR peaked around 0050 UT.
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File Type: png 9630-100603-2355-0157-HED362@CH.png (40.1 KB, 330 views)
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Old 04-06-2010, 18:21   #12
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Hi Terje and all,

Oh, I understand about sleeping all night, yes indeed! I'm with you, and a decent uninterrupted night's sleep is a wonderful thing. At least with the DRM programs available for our use we can do unattended logging. Pity the poor analog types who are still manually logging in the middle of the night. Having done a lot of night-time listening in the past, I no longer feel the need to actually be awake.
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Airspy HF+ Discovery + SDR-Console s/w + 60m dipole
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Old 04-06-2010, 21:30   #13
drmdab
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For those of you speaking Spanish, there is a report about DRM from Costa Rica on REE's website:

http://www.rtve.es/mediateca/audios/...a/790400.shtml
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Old 05-06-2010, 07:49   #14
Digger
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4 - 5 June

Looking at the Doppler, it looks better than the previous nights. But like I said, according to my experience, there will be no decoded audio with Doppler values above 1 Hz with my setup. Zzzzzz. . .
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File Type: png 9630-100604-2350-0155-HED362@CH.png (39.1 KB, 381 views)
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Old 06-06-2010, 02:40   #15
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4-5 June log

Some weakness in the band last night, and the solar indices were not helping at the time!
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