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Old 01 September 2011, 05:42   #11
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Aye, but it removes all the "boat 1, this is boat 2 - go to channel 72?" type traffic.....
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Old 01 September 2011, 05:54   #12
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Best cure for an open mike is one of these retuned to 16, no repeats

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Old 01 September 2011, 06:26   #13
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Will - what on earth is a "test Mayday"? We get practice pans all the time but can anyone tell me what the purpose of a test mayday would be? Any Lifeboat crew here care to elaborate?
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Old 01 September 2011, 09:11   #14
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Will - what on earth is a "test Mayday"? We get practice pans all the time but can anyone tell me what the purpose of a test mayday would be? Any Lifeboat crew here care to elaborate?
Sry - my bad - it was an exercise Mayday Relay
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Old 01 September 2011, 09:31   #15
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when allweather lifeboats were first fitted with D/F it saved literally hours and hours of searching in fog or bad visibility, all thats needed is a call to the casualty asking them to give a count to 10 and you can home in and head straight for them ,,as long as there was nothing in between such as a headland or reef .
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Old 01 September 2011, 11:19   #16
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But DSC Distress or Urgency will switch all radios to ch.16 after the Digital message is sent on ch 70
Problem is that if your VHF has been scanning and locks onto station with a jammed mic, that's all you'll get. The VHF won't switch to another station until the channel it's receiving is idle (at least I think that's what'll happen.) If it's 16, fine, but if it's some other station, you're stuck there.



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when allweather lifeboats were first fitted with D/F it saved literally hours and hours of searching in fog or bad visibility, all thats needed is a call to the casualty asking them to give a count to 10 and you can home in and head straight for them ,,as long as there was nothing in between such as a headland or reef .
Well, you'll still head straight for them; you just won't quite get there...


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Old 01 September 2011, 12:24   #17
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unless you press scan stop the scanning process and untag the the affected channel... so when you restart scan it skips the jammed channel....VHF's are wonderful bits if kit if you spend some time playing with the features !

Scan, Dual Watch and Tri Watch are useful!

just DONT press the RED button when playing...
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Old 01 September 2011, 16:06   #18
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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.
Odd, over here they have been upgrading their DF equipment, although our CG only recently got the capacity to hear digital frequencies (70).

We have open mike situations almost every weekend it seems. Sometimes the CG is able to break in and "override" the transmission, and/or provide some rough location of the offending transmitter. Mostly not though and everyone is just stuck waiting for it to cease. Stern messages about checking equipment for proper operation follow.

If I had a mayday or pan-pan while 16 was effectively jammed, I would try hailing our vessel traffic (VTS) and/or on the CG working channel (22a here).
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Old 01 September 2011, 17:28   #19
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Best cure for an open mike is one of these retuned to 16, no repeats

AGM-88 HARM - Wikipedia, the free encyclopedia
Made by Raymarine


ish
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Old 01 September 2011, 20:32   #20
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Almost. That would be Raytheon building the missiles.

The Raytheon consumer division was renamed Raymarine after it was spun off about 10 years ago.
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