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Shortwave Data Decoding - Discussions regarding decoding digital signals on the HF bands, including HFDL, ALE, RTTY, CW, and others.

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Old 11-28-2017, 7:12 PM
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Default 8,414.5 KHZ DSC frequency ???

8,414.5 KHZ USB can someone tell me if this is a Digital Selective Calling (DSC) frequency or a Navtex frequency. I thought it was DSC but I am picking up all Navtex messages on this frequencies.

Also UTC 1:41 - 6,312.000 - KHZ - DSC I am picking up Navtex Messages also
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Last edited by Saint; 11-28-2017 at 8:05 PM..
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Old 11-29-2017, 1:43 PM
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https://www.navcen.uscg.gov/?pageName=cgcommsCall

Tune down to 8412.8 khz to decode DSC traffic. It looks like the USCG is now accepting test calls on 4207.5 khz for east/west coat USA.
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Old 11-30-2017, 10:12 PM
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8.414.5 is USCG Navtex days
8.414.5 is Argentina navy Navtex at 0400 UTC

The following links show reception reports

https://www.youtube.com/watch?v=MXBY9c3h6DM

https://www.youtube.com/watch?v=MXBY9c3h6DM
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Old 12-01-2017, 8:13 PM
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I thought NAVTEX was 518 khz?

I've been trying to decode GMDSS using MultiPsk (as well as Sorcerer and a couple of others) and I am getting nothing.

I have the receiver tuned to 8414.5 USB, and the MultiPsk software mode set to "GMDSS" and I get a signal in the waterfall, and I can hear the tone, but no text.

I tried YADD (Yet Another DSC Decoder), and got nothing. Then I tried YAND (Yet Another Navtex Decoder), and I finally got decoded text.

So if 8414.5 is NAVTEX, what is the difference between it and GMDSS? I thought I had this figured out.
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Old 12-01-2017, 8:24 PM
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Default Navtex

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Originally Posted by W4KRR View Post
I thought NAVTEX was 518 khz?

I've been trying to decode GMDSS using MultiPsk (as well as Sorcerer and a couple of others) and I am getting nothing.

I have the receiver tuned to 8414.5 USB, and the MultiPsk software mode set to "GMDSS" and I get a signal in the waterfall, and I can hear the tone, but no text.

I tried YADD (Yet Another DSC Decoder), and got nothing. Then I tried YAND (Yet Another Navtex Decoder), and I finally got decoded text.

So if 8414.5 is NAVTEX, what is the difference between it and GMDSS? I thought I had this figured out.
I use Yand to decode Navtex on 8.414.5 and 6.312.0 kHz
I have yet to decode any DSC
Steve
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Old 12-01-2017, 9:04 PM
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Quote:
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I use Yand to decode Navtex on 8.414.5 and 6.312.0 kHz
I have yet to decode any DSC
Steve
I used Yand for the first time today to decode NAVTEX. I thought 8414.5 was GMDSS, which probably explains why it didn't work when I tried using Yadd.

But, Yand shows 518 and 490 khz, and Yadd shows 8414.5, yet Yadd won't decode 8414.5, whereas Yand will.
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Old 12-01-2017, 9:25 PM
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Default yand

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Originally Posted by W4KRR View Post
I used Yand for the first time today to decode NAVTEX. I thought 8414.5 was GMDSS, which probably explains why it didn't work when I tried using Yadd.

But, Yand shows 518 and 490 khz, and Yadd shows 8414.5, yet Yadd won't decode 8414.5, whereas Yand will.
Yea' I noticed the same discrepencies also with these decoders.
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Old 12-01-2017, 9:25 PM
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I won't try to explain software differences in decoding - too much variation in receivers, bad decodes, whatever - but I think part of the issue is that folks are confusing the purposes between GMDSS and NAVTEX

GMDSS is a selcall system- a DSC broadcast that is nothing more than a signaling mode...see this reference from our digital decoding FAQ

https://www.sigidwiki.com/wiki/GMDSS...ective_Calling

Now NAVTEX - which is built off of the Sitor-B protocols - is for news and maritime broadcast information. It's sometimes also referred to as Radio-Telex, and you can find more information here...

https://www.sigidwiki.com/wiki/SITOR-B

also see Bill Hepburn's excellent website on the subject, which is linked in the article above

Both modes have a very unique and distinct sound; you simply can't mistake one for the other. You don't even need a waterfall to tell the difference. There are audio samples of both modes on the UDXF digital page..

Digital Modes

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Old 12-04-2017, 7:48 AM
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Where can you find Yand......
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Old 12-04-2017, 8:40 AM
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Where can you find Yand......
Try here:
https://www.ndblist.info/datamodes.htm
Scroll about 2/3 of the way down.
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Old 12-04-2017, 10:46 AM
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Quote:
Originally Posted by W4KRR View Post
Try here:
https://www.ndblist.info/datamodes.htm
Scroll about 2/3 of the way down.
Thanks got it,its nice you also can download an user manual....
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