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Old 12-05-2015, 09:57   #16
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Re: New HF-DSC Explanation and LIVE Demonstration Videos

With the recent discussions of Digital Selective Calling and specifically HF-DSC / SSB , I thought bumping this back up top might give some of you the chance to see it....

Watch the video playlists, and I think you'll enjoy!

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



And, some others as well...

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


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


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



Fair winds to all..

John
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Old 28-06-2016, 12:39   #17
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Re: New HF-DSC Explanation and LIVE Demonstration Videos

With all the talk of EPIRB's, "ditch bags", etc...and with the recent loss of a father and his 3 teenagers just off the coast of SW Florida, I thought some might want to know more about EPIRB's, how they work, how the COSPAS-SARSAT system works, etc....
As well as, remember that MF/HF-DSC signaling is just as big of a part of the GMDSS as the 406mhz EPIRB is...

So, for those wishing the details of EPIRB operations, and how to best deploy/use an EPIRB, please have a look here..
EPIRB's are NOT dead! / EPIRB Activation? What happens/How to improve rescue odds!!


Fair winds..

John
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Old 29-07-2018, 13:22   #18
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Re: New HF-DSC Explanation and LIVE Demonstration Videos

While 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.





I also added it to these playlists:

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


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


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


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



Fair winds to all.

John


P.S. FYI, here is my original video regarding channel / frequency choice and the basics of Radiowave Propagation, from Oct 2013...

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Old 03-09-2018, 13:59   #19
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Re: New HF-DSC Explanation and LIVE Demonstration Videos

Hello to all,
I just recently uploaded a couple new videos, showing LIVE, real-world Ship-to-Ship HF-DSC calls...

I've added them to my HF-DSC Playlist...please have a look....(and, please watch the playlist in order, so that it all will make sense)

https://www.youtube.com/playlist?list=PLnN6ygtZ3h2n3z5nlv-ga2zYuPozhUXZX


And, for those completely familiar with their radio and with HF-DSC, here are the videos:

"Live, Ship-to-Ship HF-DSC Calling, on GMDSS HF-DSC Calling Freqs"
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