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Old 01-12-2013, 11:29   #1576
mvs sarma
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Quote:
Originally Posted by tpreitzel
I was receiving this broadcast and using the Newstar's DR111 display to watch the SNR as I systematically tested more than two dozen cables to identify a fairly recent appearance of noise. It worked as I identified and removed three 6' unshielded cables. As a result, reception of RNZI on 9870 kHz this morning was excellently decoded with an average SNR ~ 16 dB. The percentage of decoded audio was probably greater than 90 %.
Nice to know,
Did you mean UTP cables (used and called CAT6 or CAT5 cables?)
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Old 01-12-2013, 13:43   #1577
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Weak beginning, only the last hour was perfect. Around 0925 the audio started to come. The first transmission had ID:C00000 and the second had no ID at all.

The screenshot is a comparison between the FRG-7700 and the DR111. Both perform more or less the same. Only the clocks are not synchronized, so there is a slight time-slip in the logs.
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File Type: png 9870-131201-0823-1159-Terje@SE.png (43.1 KB, 79 views)
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Old 01-12-2013, 13:51   #1578
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Quote:
Originally Posted by mvs sarma
Nice to know,
Did you mean UTP cables (used and called CAT6 or CAT5 cables?)

OT - No. I had already replaced all the UTP Ethernet cables with SSTP Cat 7. I identified 3 unshielded audio cables. Audio cables are the biggest problem IMO. I've ordered 3 shielded audio cables manufactured by Mediabridge to replace the current ones. At this point, I'm basically finished with the cabling.

Last edited by tpreitzel : 01-12-2013 at 13:58.
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Old 01-12-2013, 13:53   #1579
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Ambient Conditions: 39 F @ surface, RH 62 %, overcast, average noise, PC & M2 off ( 0 dB loss )

Although the last hour is missing, it was just as good as the previous hours so the rating is excellent... The atmospheric noise level was still elevated during the broadcast, but within a range that I'd consider normal.
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Last edited by tpreitzel : 01-12-2013 at 14:01.
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Old 01-12-2013, 14:50   #1580
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RNZI 9870 kHz reception near Atlanta, Georgia, USA

This morning's reception (middle two hours) - Excellent - 99.93% audio decoded.
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Old 02-12-2013, 10:40   #1581
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Total silence since the start and suddenly around 11H00 UTC almost 100% audio
Back to silence around 11H30 UTC
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Old 02-12-2013, 12:58   #1582
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Quote:
Originally Posted by tpreitzel
OT - No. I had already replaced all the UTP Ethernet cables with SSTP Cat 7. I identified 3 unshielded audio cables. Audio cables are the biggest problem IMO. I've ordered 3 shielded audio cables manufactured by Mediabridge to replace the current ones. At this point, I'm basically finished with the cabling.
Ah.
I too had suffered at this issue. Recently bought few 3.5mm E P to E P stereo cables. when I tried them, I had heavy noise on the SD radio graph, even without connecting the cable at SDR side. when i slit open the cable i found that they had just used 3 wires instead of 2 wires and shield. In fact they are supposed to use separate shield for each channel ( L or R ).

Later i bought fresh ones , supposedly supplied with DELL machines. Now only i could restore the low levels like -120dB etc. Perhaps the three wire cables are meant for speakers etc with high drive levels , they feel , no need for shield
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Old 02-12-2013, 14:39   #1583
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DR111 with external active antenna

Although I had 11-13 dB from the FRG-7700 with Dream at the beginning this morning, the DR111 wouldn't show a single dB SNR.

I pressed the presets and back to RNZI, but no. Nothing. But after a while I heard sound and later I started the log. The last hour is definitely the best here. Perfect. Still, I got 93.3% decoded audio during the three last hours of the transmission. I mistook the time, so the log is a bit chopped off at the end.
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Old 02-12-2013, 15:14   #1584
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Perfect today, DRM_DX .Log last 55min.Only small dropout from 1130UTC .Strong AM start on 9870.
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Old 02-12-2013, 15:52   #1585
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RNZI 9870 kHz reception near Atlanta, Georgia, USA

Very good Terje & Sixten!

This morning's reception (last three hours) - pretty good here too - 96.65% audio decoded.
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Old 03-12-2013, 12:59   #1586
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Not a good day for RNZI this morning. Were they doing maintenance? There was an AM station on the channel around 0845 UTC speaking in something that resembled Russian (to me, anyway). All I could make out was "Kazakhstan", "islam" and "neo-nazi", definitely not RNZI... The signal disappeared at 0900, but there was just silence. Later on I noticed RNZI in DRM, but the log is not very good today. Only about 58% decoded audio.


PS: I may have got the frequency wrong for the AM station mentioned above. It was most certainly our dear Mr. Kim in DPRK on 9.875 MHz - it is there today too, and the music is definitely North Korean. Unfortunately, the modulation spectrum kills the DRM from RNZI. Fortunately, DPRK pulls the switch just before 09 UTC.
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Last edited by Digger : 04-12-2013 at 07:55.
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Old 03-12-2013, 15:20   #1587
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RNZI 9870 kHz reception near Atlanta, Georgia, USA

This morning's reception (last three hours) - poor here too - 8.73% audio decoded.
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Old 04-12-2013, 13:17   #1588
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It is DPRK in Russian 5 kHz up that interferes with RNZI before 09 UTC.
After that the decoding improved a lot. About 87% decoded audio in today's log.
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Old 04-12-2013, 15:54   #1589
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RNZI 9870 kHz reception near Atlanta, Georgia, USA

This morning's reception (last three hours) - 82.35% audio decoded.

Similar result to your log Terje.
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Old 05-12-2013, 08:05   #1590
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Quote:
Originally Posted by Digger
It is DPRK in Russian 5 kHz up that interferes with RNZI before 09 UTC.
After that the decoding improved a lot. About 87% decoded audio in today's log.

Yep. The 9875 kHz signal is quite strong here, but the signal is still there past 0900Z. Reception of RNZI @ 9870 kHz is basically useless until this interference is eliminated or the frequency is changed. Only the last hour was semi listenable ... currently -10 F which is tomorrow's high temperature .... brrrrrrrrrrrr

Last edited by tpreitzel : 05-12-2013 at 11:15.
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