Reply
 
Thread Tools Search this Thread
 
Old 31 August 2011, 10:41   #1
Member
 
boristhebold's Avatar
 
Country: UK - England
Length: 7m +
Join Date: Aug 2009
Posts: 1,293
Question about Ch 16

Was out and about on Monday in Poole Bay, I noticed some numpty head had an open mic on channel 16 for a good few hours, sounded like they were chatting away in the background making their dinner. Apparently it was in the christchurch area somewhere.

So my question is what is the impact of an open mic, I know it stops us hearing things but does it also stop the coastguard / rnli etc, does it stop us being able to transmit on that channel. Can anyone explain better to me what happens.
__________________

__________________
boristhebold is offline   Reply With Quote
Old 31 August 2011, 10:45   #2
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,114
My understanding is the strongest signal will overpower all the others. So yes it can potentially wipe out quite a big area for quite some time. A number of radio manufacuturers have systems in place to stop you accidentally locking the mike on for long periods (so say after 10mins of transmit it just stops).
__________________
Poly is offline   Reply With Quote
Old 31 August 2011, 10:48   #3
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Potentially drown out a Mayday shout....

It's the same reason when you call someone on CH16 the first thing you do is agree what channel you are going to switch to, the second being to switch to a working channel!

It's related to one of the good things about MMSI "direct dial" - it doesn't clog 16.
__________________
9D280 is offline   Reply With Quote
Old 31 August 2011, 12:12   #4
Member
 
Anchorhandler's Avatar
 
Country: France
Town: Huisnes sur Mer
Boat name: Raufoss
Make: Avon
Length: 4m +
Engine: Mercury 50
Join Date: Sep 2010
Posts: 789
Sadly we suffered a problem last week on ch12.....for about 1.5 hours all we could hear were dogs barking????

Although Coast Guard and VTS still only transmit at 25w, they generally have some pretty big, high gain, low loss 'sticks' to help broadcast the message.

It would be difficult for a leisure boat vhf set to drown out the CG or VTS, especially if they are close to shore. Offshore and you happen to be on the threshhold for range of a CG broadcast station then somebody nearby with an 'open mic' could very well cause you problems.

I'm always dismayed at how many times we hear children messing about with a VHF set sometimes (but luckily rarely) for hours. Bring back electro-shock therapy!

Simon
__________________
C'est pas l'homme qui prend la mer, c'est la mer qui prend l'homme....
Anchorhandler is offline   Reply With Quote
Old 31 August 2011, 12:32   #5
Member
 
boristhebold's Avatar
 
Country: UK - England
Length: 7m +
Join Date: Aug 2009
Posts: 1,293
Thanks that makes sense. At the bournemouth airshow I heard some muppets singing a song on channel 16, the coastguard was not amused.
__________________
boristhebold is offline   Reply With Quote
Old 31 August 2011, 12:58   #6
Member
 
m chappelow's Avatar
 
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
in some cases the m.c.a (coastguard) will ask a lifeboat if its fitted with D/F (direction finding equipment ) to try locate the vessle or set,

one of our local fishing boats had the skipper squeeze the mike so hard that the switch stuck on transmit ,,unbeknown to him all we could hear for about 2 hours were the sound of a single cylinder diesel engine and the crew slagging all the other local fishing boats off that they came across ,,,bit embaressed when they finally got back to shore and realised what had happened ,,lol
__________________
m chappelow is offline   Reply With Quote
Old 31 August 2011, 13:04   #7
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,926
RIBase
Quote:
Originally Posted by boristhebold View Post
I heard some muppets singing a song on channel 16, the coastguard was not amused.
Not entirely relevant, but recently I heard Belfast CG calling a test MAYDAY on 16 when they meant to make it on 0. Clyde CG were not amused. P&O Highlander was not amused. Few redners all round....

__________________
willk is offline   Reply With Quote
Old 31 August 2011, 13:30   #8
RIBnet supporter
 
Ian M's Avatar
 
Country: UK - England
Town: New Milton
Boat name: Jianna
Make: Osprey
Length: 6m +
Engine: 200 E-TEC
MMSI: 235076954
Join Date: Sep 2004
Posts: 1,933
I confess...............

Many years ago (but not THAT many) we used to have female divers on the club dive boat One of these beauties decided that it was too hot for her to be wearing a woolly hat, so she stuffed it into a gap in the console, directly above the mike You guessed it.................. for 10 minutes we were transmitting on 16. Fortunately one of the more intelligent (male) members of the crew spotted it and it was discretely removed. Thankfully nothing had been said that identified us Oh the shame
__________________
Ian

Dust creation specialist
Ian M is offline   Reply With Quote
Old 31 August 2011, 13:53   #9
SPR
Trade member
 
SPR's Avatar
 
Country: UK - Scotland
Town: Central Belt of Scotland
Boat name: Puddleduck III
Make: Bombard
Length: 5m +
Engine: 50 HP
Join Date: Mar 2009
Posts: 2,066
I believe that DF equipment have been removed from coastguard ststions .. so need to task two resources now:

House of Commons - Transport Committee - Written Evidence

S.
__________________
SPRmarine / SPRtraining
RYA Training Courses & Safety Equipment Sales
SPR is offline   Reply With Quote
Old 31 August 2011, 13:58   #10
SPR
Trade member
 
SPR's Avatar
 
Country: UK - Scotland
Town: Central Belt of Scotland
Boat name: Puddleduck III
Make: Bombard
Length: 5m +
Engine: 50 HP
Join Date: Mar 2009
Posts: 2,066
Quote:
Originally Posted by 9D280 View Post
It's related to one of the good things about MMSI "direct dial" - it doesn't clog 16.
But DSC Distress or Urgency will switch all radios to ch.16 after the Digital message is sent on ch 70

So still pita if somebody is jamming 16 , although they might notice if its DSC Radio bleeping ...

S.
__________________
SPRmarine / SPRtraining
RYA Training Courses & Safety Equipment Sales
SPR is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 07:31.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.