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Old 08-10-2017, 16:16   #61
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Re: DSC (Digital Selective Calling) Explanation

cburger,
The short answer is: No
You can still use the radio to talk on cruiser's nets, and ham radio operations (assuming you're a licenses ham?), as well as use it to receive all sorts of signals (WeFax, SSB Voice weather, shortwave broadcasts, etc.)...
And, of course if you're within range (~ 5000 miles of Mobile, AL) of WLO, you can still use the radio to make and receive ship-to-shore telephone calls....
{and, if you're within range of USCG's NMN or NMC....or AMSA, or NZ Maritime radio/Taupo....then you could still use your radio to call them on SSB Voice, as they continue to maintain an SSB Voice radio watch on a few frequencies...}
Quote:
Originally Posted by cburger View Post
Does this mean that my older non DSC SSB is no longer serviceable ?
The long answer is....well it is long!
But, in the context of using a non-DSC HF radio to call / signal other vessels (or to call / signal the >80 HF-DSC shore stations, or the >450 MF-DSC shore stations, currently operating worldwide), then the answer is: Yes, it is no longer serviceable...and hasn't been since Jan 1999...


Please remember the GMDSS (Global Maritime Distress and Safety System) which mandated Digital Selective Calling (DSC) on both VHF and MF/HF radios (as well as 406mhz EPIRB's, INMARSAT-C, NAVTEX, and SART's), was implemented in 1992....and became mandatory for all signatory nations and all SOLAS vessels in Jan 1999...
So, this has been around / in use daily for decades now...



If you read this thread, from the beginning....and watch the videos, in their entirety....then you should be able to see that all of this is well explained...

I hope this clarifies things??
Fair winds...

John
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Old 08-10-2017, 19:33   #62
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Re: DSC (Digital Selective Calling) Explanation

Quote:
Originally Posted by cburger View Post
Does this mean that my older non DSC SSB is no longer serviceable ?
You can use a software app to do DSC on an older SSB radio. It is called PersonalDSC.

https://m.ebay.com/itm/Personal-DSC-...%257Ciid%253A1
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Old 21-04-2018, 21:16   #63
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Re: DSC (Digital Selective Calling) Explanation

How do these new Uniden Radios do Text messages to an MMSI ?

https://www.uniden.com/shop/communic...e-radio/#specs
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Old 22-04-2018, 11:21   #64
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Re: DSC (Digital Selective Calling) Explanation

Well, you can download the manual. But since that page says you must USE A SMARTPHONE AND BLUETOOTH to set that up, presumably you just send a regular SMS message from the smartphone, by bluetooth, to radio. Which just passes it on to the MMSI/DSC system.

Older equipment, even LORANs, allowed you to enter text just by menu'ing to the text entry screen, then using the up/down arrows to choose letters. Slow, but no fancy keyboard or phone required.
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Old 22-04-2018, 11:54   #65
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Re: DSC (Digital Selective Calling) Explanation

Quote:
Originally Posted by hellosailor View Post
Well, you can download the manual. But since that page says you must USE A SMARTPHONE AND BLUETOOTH to set that up, presumably you just send a regular SMS message from the smartphone, by bluetooth, to radio. Which just passes it on to the MMSI/DSC system.

Older equipment, even LORANs, allowed you to enter text just by menu'ing to the text entry screen, then using the up/down arrows to choose letters. Slow, but no fancy keyboard or phone required.
I did read the manual, and my take-away was that you can optionally use an IOS or Android APP over Bluetooth to setup the VHF radio and send "text Messages". But there is also a way to enter a message and send it only using the keypad and screen on the VHF and an MMSI. Without Cell service over VHF frequencies.

Anybody know anything about that ?
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Old 22-04-2018, 14:01   #66
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Re: DSC (Digital Selective Calling) Explanation

JM-
In theory you can send SMS across any systems, any devices. All that is required is a "gateway" across the networks. SMS originally was just sending single-packet text messages across the command/control channel of the cellular system. What they call "text messaging": now goes way beyond that.
The cellular companies got fancy and all put up gateways to the internet email system, so you can send an email to "123-123-4567@phonecarriersgateway.com" and it goes as a regular email, is received at the gateway, and then is forwarded in the cellular system. All transparent to the user.
For that to work from DSC there would have to be gateways set up within relay range of your radio. There could be--I've just never heard of it. Any junior high school programmer could set up the gateway...question is who's going to pay for it? Or why would they? (Quickly, call Mark Zuckerberg.(G)
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Old 22-04-2018, 14:07   #67
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Re: DSC (Digital Selective Calling) Explanation

JM, Hellosailor, et al,

Don't over think this....(and in reality since it's a Uniden specific product feature, it's probably not a great addition to this thread, and deserves its own discussion...but oh well.)

This seems to be Uniden's marine version of the original "gotenna" system...the original gotenna, allowed you to use your cellphone, via Bluetooth to the gotenna radio, to send SMS (texts) to another gotenna radio/user, using the gotenna radio on the VHF "MURS" channels..

It is also similar to the "Beartooth" system, although they allow voice comms and use the 902-928mhz band.

But, it appears that this is not a "mesh" network, as I don't think that is allowed on VHF maritime freqs, as this could cause serious frequency congestion / interference to the discrete Maritime VHF system!


And, specifically on-point, it appears that this does use VHF-DSC signaling functions (as you must have the MMSI# of any vessel you wish to send an SMS message to, programmed into the radio)...but unsure if your actual SMS /"text" is sent on another VHF-FM channel and the radio then sends this to your phone via Bluetooth, but this appears to be the case...
And/or, you can use the radio's buttons/screen to compose/send a SMS/text, without a phone linked to the radio.

Might be a nice toy to play with...but again, Uniden specific...


Fair winds.

John
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Old 22-04-2018, 14:17   #68
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Re: DSC (Digital Selective Calling) Explanation

Oh goodness, Pizzazz,
I didn't see this posting until now...

What you linked to is a fairly un-workable solution...aside from a few hobbyists, I cannot think of anyone who would consider a piece of software running on a windows laptop, etc., to be a workable solution for HF-DSC comms, where most of what the average sailor/cruiser needs from it, is Urgency or Distress signaling to RCC's and/or SOLAS vessels...

I can't think of anyone who'd be booting-up a computer, starting some software/APP and then verifying the radio is connected and working, etc. all to send a Distress or Urgency message, when in a dire situation...

Although, their software may work, in my personal opinion this is a ridiculous product to promote to those sailing offshore...


Fair winds....and again, sorry I missed this, 6 months ago.

John
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Old 22-04-2018, 14:52   #69
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Re: DSC (Digital Selective Calling) Explanation

Gotenna, Beartooth...Thanks John. "Yet Another Incompatible Proprietary Piece of ...."

But when you consider that SMS started out the same way, tagged onto a back channel, it might actually make sense to standardize something to provide that.

"Nossir, I didn't see that bridge pier, I was texting on my DSC radio at the time."
(Seen that movie before?(G)
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Old 29-07-2018, 13:29   #70
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Re: DSC (Digital Selective Calling) Explanation

While some here-abouts cringe when they see a posting from me with those three letters, DSC....this is just a radio propagation update....so, no ranting about DSC from me today!

There haven't been many changes to the GMDSS....there are a few....like Iridium's new offering from their "NEXT" satellites (Certus) awaiting GMDSS certification, and INMARSAT's Fleet Broadband waiting on the same.....
But, with the prices of those systems and airtime/data costs, it's unlikely any of my fellow budget-conscience cruisers will be ordering any of those anytime soon!!

And, of course just a reminder that the USCG no longer monitors any MF / 2Mhz channels, not 2182 on SSB, nor 2187.5 DSC....
But, of course, DO monitor the remaining 5 GMDSS DSC freqs 24/7, from multiple locations!

https://www.navcen.uscg.gov/?pageName=cgcommsCall



So, there are of course parts of the GMDSS that we all use daily, and many other parts that we equip our boats with....and while the GMDSS was designed to work without specially-trained personnel, it is good to know something about radios, radiowave propagation, MF/HF-DSC, etc....
So, that's why I made all the videos that I did...

This fall, it will be a few years since I recorded/uploaded these videos...

And, while neither the radio nor the basic approach to using it has changed, what has changed is the ~ 11yr solar cycle (which regulates the foibles of long-range radio communication)....

As you can see from this graph, when I recorded most of these videos in Oct 2013 (and again in early 2015), the sunspot cycle wasn't great (avg SSN of 55 to 60), it was much higher than today, in 2018...




So...
So, this month (July 2018) I did another video, updating and describing current HF radiowave propagation for the offshore mariner (whether they use maritime or ham bands)...

This new video, together with my earlier video regarding channel / frequency choice and the basics of Radiowave Propagation, should give many of you some assistance in getting the most out of your HF communications system on-board.



Have a look:









I've also added it to a few Playlists, so it will be available to all when the need it...




HF-DSC Communications
https://www.youtube.com/playlist?lis...ga2zYuPozhUXZX




Maritime HF Communications
https://www.youtube.com/playlist?lis...ZDo_Jk3NB_Bt1y




Offshore Weather
https://www.youtube.com/playlist?lis...zdjTJjHlChruyY




Icom M-802 Instruction Videos
https://www.youtube.com/playlist?lis...rC-8QKVyMb4tVr




Fair winds.


John
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