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Old 11 November 2013, 01:02   #11
Country: UK - Channel Islands
Town: Jersey
Boat name: Archangel
Make: Ribcraft
Length: 6m +
Engine: ETec 225
MMSI: 235063789
Join Date: Sep 2008
Posts: 1,005
Originally Posted by SPR View Post
And send him on Ham operators course , car battery to heavy to take - with 3 weeks of food supplies...
Just trying to be helpful mate. Any 100w transmitter with need a 25w PSU.

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Old 11 November 2013, 02:33   #12
Country: UK - England
Length: 3m +
Join Date: Sep 2008
Posts: 2,074
So if I recall my physics correctly squaring the power, doubles the distance travelled? So a 100W travels twice as far as a 10W. So roughly speaking a 5W will travel a quarter of the distance of the 125W on the yacht.

So if they get > 1000nm. He might get 250nm.

That assumes he has the same aerial.

Is he wanting comms for disasters - not really practical to rig a 20ft high aerial in an emergency.

Or is he wanting comms for updating the world what he's up to etc in which case when he gets to each camp site thee may be options to rig something up which actually just coils up? But then who'd be listening 250nm away? Would that reach SPR land?

How will he charge his mobile comms whatever that is? 3 weeks is a long time to be without a 3 pin socket in my world! So is he using solar power? How do you charge while underway (when the sun is at its best) and keep everything dry and accessible.

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Old 11 November 2013, 05:24   #13
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Country: UK - Scotland
Town: Central Belt of Scotland
Boat name: Puddleduck III
Make: Bombard
Length: 5m +
Engine: 50 HP
Join Date: Mar 2009
Posts: 2,061
thanks - looks like iridium might work, with PLB being back up plan if it works!

Thanks - got advice both here and PM.

HF looks to complicated to consider...

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