Digital voice on VHF marine?

Digital voice on VHF marine?

Post by J999 » Tue, 26 Aug 2003 17:36:52

I was parked on the bluff above the Port Washington, WI harbor on Lake
Michigan,  and heard two stations communicating in what sounded like a
digitized or scrambled mode. I could hear the inflections in their voices but
not understand them.

I don't recall what channel it was. No problems hearing the USCG or other small
fishing boats.

??

John WIlke
Milwaukee

 
 
 

Digital voice on VHF marine?

Post by Dwight Stewar » Wed, 27 Aug 2003 09:26:24



> I was parked on the bluff above the Port
> Washington, WI harbor on Lake Michigan,
> and heard two stations communicating in
> what sounded like a digitized or scrambled
> mode. I could hear the inflections in
> their voices but not understand them.

  Yes, digital is on VHF marine. What you may have heard is Digital
Selective Calling (DSC), an automated beacon, or some other similar digital
transmission. Don't worry, since there is little advantage in it at the
moment, digital won't take over marine radio anytime soon.

Dwight Stewart   (W5NET)

http://www.qsl.net/w5net/

 
 
 

Digital voice on VHF marine?

Post by abigthrea » Wed, 27 Aug 2003 12:36:16

If you remember the freq, check to see if it is around ch 70.  Somewhere
around ch.70 is the DSC freq

Quote:> I was parked on the bluff above the Port Washington, WI harbor on Lake
> Michigan,  and heard two stations communicating in what sounded like a
> digitized or scrambled mode. I could hear the inflections in their voices
but
> not understand them.

> I don't recall what channel it was. No problems hearing the USCG or other
small
> fishing boats.

> ??

> John WIlke
> Milwaukee

 
 
 

Digital voice on VHF marine?

Post by J&D Schnoo » Thu, 28 Aug 2003 13:39:08

I seem to recall audio inversion scrambling allowed on some VHF marine
channels.  However, it also could have been a police agency using it also.
I know, not exactly the usage originally intended by the FCC, but trust me,
it has happened before on VHF marine.  Although, with so many Nextels, etc.,
I am more likely to think a commercial marine operation using simple
scrambling.  If you do a Google search or something similar and put in VHF
marine scrambling, you will see several manufacturers that offer scrambling
either standard or as an option.  (You don't want other fisherman to know
where you caugh that sunfish at!)

Jim  N?JS

 
 
 

Digital voice on VHF marine?

Post by Da » Fri, 29 Aug 2003 02:02:04

I listen to marine freq's all the time and have heard the Coast Guard
use the digital type scrambling at times in lake Ontario.
 
 
 

Digital voice on VHF marine?

Post by Da » Fri, 29 Aug 2003 02:02:08

I listen to marine freq's all the time and have heard the Coast Guard
use the digital type scrambling at times in lake Ontario.
 
 
 

Digital voice on VHF marine?

Post by mar.. » Fri, 29 Aug 2003 05:12:06


> I seem to recall audio inversion scrambling allowed on some VHF marine
> channels.  However, it also could have been a police agency using it also.
> I know, not exactly the usage originally intended by the FCC, but trust me,
> it has happened before on VHF marine.  Although, with so many Nextels, etc.,
> I am more likely to think a commercial marine operation using simple
> scrambling.  If you do a Google search or something similar and put in VHF
> marine scrambling, you will see several manufacturers that offer scrambling
> either standard or as an option.  (You don't want other fisherman to know
> where you caugh that sunfish at!)
> Jim  NJS

Many off-shore fishing fleets use inversion.
I've heard them in NYC.
 
 
 

Digital voice on VHF marine?

Post by keit » Sat, 30 Aug 2003 02:08:01

same here on the oregan coast.  i accidetly decoded the tran and it
was fishermen talking bout the season.  
On Wed, 27 Aug 2003 04:39:08 GMT, "J&D Schnoor"

>I seem to recall audio inversion scrambling allowed on some VHF marine
>channels.  However, it also could have been a police agency using it also.
>I know, not exactly the usage originally intended by the FCC, but trust me,
>it has happened before on VHF marine.  Although, with so many Nextels, etc.,
>I am more likely to think a commercial marine operation using simple
>scrambling.  If you do a Google search or something similar and put in VHF
>marine scrambling, you will see several manufacturers that offer scrambling
>either standard or as an option.  (You don't want other fisherman to know
>where you caugh that sunfish at!)

>Jim  N?JS

 
 
 

Digital voice on VHF marine?

Post by Woolrid » Sat, 30 Aug 2003 07:50:21


> I seem to recall audio inversion scrambling allowed on some VHF marine
> channels.  However, it also could have been a police agency using it also.
> I know, not exactly the usage originally intended by the FCC, but trust me,
> it has happened before on VHF marine.  Although, with so many Nextels, etc.,
> I am more likely to think a commercial marine operation using simple
> scrambling.  If you do a Google search or something similar and put in VHF
> marine scrambling, you will see several manufacturers that offer scrambling
> either standard or as an option.  (You don't want other fisherman to know
> where you caugh that sunfish at!)

> Jim  N?JS

lol nice one. made me chuckle.