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Old 13 June 2011, 13:36   #11
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Ok. Thanks for that. I'm going to go for a 5 amp mini spade fuse in a waterproof holder.

Can you confirm that Tinned thinwall cable is ok to complete the circuit on the -ve side?

VWP - thinwall cable
The 1.5mm sq should be fine

Don't forget to solder all the connections and use adhesive lined heat shrink
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Old 13 June 2011, 13:40   #12
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I'm going to get some japanese bullet connectors as here for the ends.

VWP - non insulated bullet & socket terminals

Thanks for the help
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Old 13 June 2011, 13:43   #13
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Next best thing I spose - stick some vaseline in 'em before you plug them together
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Old 14 June 2011, 13:04   #14
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Ok. Thanks for that. I'm going to go for a 5 amp mini spade fuse in a waterproof holder.
Check your VHF's manual, and see what the max current draw is. If it came with a 6.3A fuse, there is a chance that 5A may blow when transmitting on high power. You should probably go a step up rather than down (small chance of exceeding current rating of wiring, but if it handles 6.3A it will most likely handle 7 or 8.)

jky
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Old 14 June 2011, 13:34   #15
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Martini, I thought the point of a fuse was to protect the equipment if there was a too high current delivered. I was under the impression that anything above 6.3 amp would damage the radio.
Fuse are to protect cables & circuit devices, not the connected equipment.
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Old 14 June 2011, 14:05   #16
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Fuse are to protect cables & circuit devices, not the connected equipment.
That's my take on it too. If your equipment is drawing enough power to blow a fuse that the manufacturer supplied,it's already trashed-but you really don't want a wiring fire.
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Old 14 June 2011, 14:11   #17
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Fuse are to protect cables & circuit devices, not the connected equipment.
Oh Contrae You have never seen a connected equipment burst into flames because of a fault and over rated fuse fitted then
38 Years in the electronice industry and have seen this a hand full of times !!
Oh and a 6.3 amp fuse is a non standard Value so as has been said check total current draw on Max (25w) RF output and go for the closest value higher..
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Old 14 June 2011, 14:37   #18
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Fuse size is determined by current rating of cable. The fuse is there to blow (melt) before the cable does. A correctly designed circuit will withstand the potential fault current of the connected load & the fuse will blow before the circuit i.e. wiring catches fire. Thus disconnecting the faulty equipment from the supply. Electronics usually have an internal fuse or protective device e.g a thermal.
I'm sure someone will be along with the popcorn shortly
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Old 14 June 2011, 14:43   #19
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I already have the popcorn and years of experience and therfore have NO nead for explenastion however you ARE missing the point I'm affraid!!
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Old 14 June 2011, 14:51   #20
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I already have the popcorn and years of experience and therfore have NO nead for explenastion however you ARE missing the point I'm affraid!!
So are you saying that each item of electrical equipment should be supplied radially on individual fuses to suit?
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