Crazyhorse

Depends on battery. The lead crystal and led carbon ("superconductor") types can take all you can throw at them and no melt down. My experience to date is that your average car alternator can NOT be converted to external regulation without some safe guards and compromise, all depends on power requirements. Heat dissipation is paramount on standard automotive size alternators that are externally regulated where the regulator has no idea how hot the alternator is getting, like Mr.Polley's ZM4 which simply keeps loading it up until you smell burning windings. Car type alternators and those tha

Grahams "bosch" alternators are actually cheap OEX Chinese made for Holden etc. He told me you cant get Bosch alternators anymore, his are "bosch type", doesn't say that on his website. Rang a supplier in Whangarei and asked him if you can get Bosch alternators "how many do you want?. His regulator uses a timer to switch between bulk and float so doesn't sense battery capacity, only voltage and you need to tell him how big the battery bank is so he can set the timer so when suddenly under full load, 50% charged batteries and running a 1000w windlass, it jumps the alternator into full output

We have a old fish net float midway along the "floating" painter as when setting the hook...they don't always float! Seen some with lots of floats (must've picked up their painter more than once!)

Of interest, you actually have to short out the field on a alternator to neutral in order to stop induced current as the simple passing of the windings through the energised stator will still produce a potential which in turn creates potential in the stator and current flow. Your alternator is still working otherwise!

Says it all really. The others? Still getting away with it?

If your hull is constructed in ply or timber, be careful running a common to all through hull fittings. Earthing straps are heavy duty fine mesh copper to minimize voltage drop and anything else can cause a voltage potential to occur between components in sea water which will slowly weaken the timber around them. My understanding is earthing skin fittings is actually counter productive and not necessary as a circuit can not be set up unless the hull is made of a conducting material, aluminium or steel.

Say it again? A horn speaker. The audio is of a higher pitch so can be heard clearly over engines, mother in-laws etc and requires very little power to drive them. One wire pair, one 2.5mm tip sleave and horn speaker.....

With out actually seeing the wiring, as its DV (12v?) I am guessing the white and green wires were put in by a previous owner and to no accepted standard other than their own. Running multiple commons back to one point is nothing to be worried about and is advisable to prevent voltage drop between various components which could acellerate electrolysis. You haven't said if you also have a parallel AC system?

As above, hate the term earth, much prefer "common" as in zero volts potential in relation to all other equipment and power supplies. Unless your starter motor and alternator is designed to run on a common plus volts (positive earth) then any cable connected directly to the engine body is going to be a common so zero volts. Unless you are wired for 240v AC you will find any and all wires attached to the same common point on the engine are simply supplying a direct return path from other equipment like your DC switch board etc.

Or sell the boat and get a job.

Keep getting those civil defence "biblical" rain warnings and the suns almost out here, sea flat.

A horn speaker is the way to go. Most are safe outdoors but require little volume to amplify the audio. Just look a little unsightly for the fussy buggars.

Exactly. Refer above, stop netting. Period.

It will have a "CE" of some sort on it. If its a purpose built transceiver for the maritime service it will not be a problem. You might get asked to produce proof that you passed some exam on its use like you need in the UK, a operators certificate but I doubt they will bother. Customs are currently only concerned with monitoring the import of non type approved equipment. New regs that came out last year here.

Well, is this blocked for you too!!!? https://www.stuff.co.nz/environment/110767355/three-hectors-dolphins-killed-in-net-off-canterbury-coast Another T H R E E Hectors dolphins, dead in nets or is that fake news too? Fisheries Inshore New Zealand chief executive Dr Jeremy Helson said it was a "regrettable and unprecedented" run of deaths. The industry was extremely concerned, he said. We are throwing all our resources into finding out why this is occurring with unusual regularity and we are heading down to Canterbury to talk to the fishers involved." "Resources"? All they have

No idea but it's all to do with importing "prohibited" equipment, that is transceivers that can operate beyond their intended specification. If it type approved, no problem. If not, you need a RSM registered dealer to import it for you and of course be legally allowed to have it in your possession so a appropriate qualification. Getting caught with a boefeng on marine channels is not a good idea.

Not sure what you mean? No prob if type approved in the UK. Bring your operators certificate too.

Yep. Gets a bit like that. Channel "width" is actually the spacing between channels so 25khz spacing, new channels now going to halve that to 12.5khz. Maximum deviation is 5khz which is the way FM is modulated by the audio volume being fed to a "variactor" so the frequency either side of the channel frequency, example: 156.800 (CH16) would be plus 805 to minus 795. FM changes the frequency slightly to transmit the audio as opposed to AM which changes the amplitude. F3E is simply the designation for FM and the 16K is the actual bandwidth allowed for the transmitter and used. Carrier pigeons wo

Nah, we need the wild west again. All carry 6 shooters and meet the bastards at high noon! (Solve the population problem too, create work for carpenters, grave diggers. Only downside will probably put the price of lead sinkers up).

Occupied Bandwidth：≤16KHz

Hmmm...No one asked about the "golly gosh" system. Didn't know this until this subject turned up and did a little research. India has their own system! Even better, its all geostationary satellites so not in our sky only for India.

16khz

Rec. ITU-R M.489-2 1 RECOMMENDATION ITU-R M.489-2* TECHNICAL CHARACTERISTICS OF VHF RADIOTELEPHONE EQUIPMENT OPERATING IN THE MARITIME MOBILE SERVICE IN CHANNELS SPACED BY 25 kHz Rec. ITU-R M.489-2 Summary (1974-1978-1995) The Recommendation describes the technical characteristics of VHF radiotelephone transmitters and receivers (or transceivers) used in the maritime mobile service when operating in 25 kHz channels of Appendix S18 [Appendix 18] of the Radio Regulations (RR). It also contains those additional characteristics of transceivers required to operate

Yep, got it totally faaaarked up Becacara, been a while since I looked at this again!! Channel spacing is 25khz (yanks moving to 12.khz). Modulation is 16k so 16khz f3e so pre-emphasis FM so phase modulation. Baofengs Puxings etc will work at 12.5kz but as I said, be careful as they are not type approved for marine VHF.

Not correct. IMO channels agreed to by the ITU are 16K0F3E so 25khz. Your APPROVED marine VHF radio is FM deviation is 25khz but there is a move in the US to 12.5khz which they have called "interleaved" and have 3 digit channel numbers so basically chopping up the available spectrum into more real estate. Your cheap Chinese illegal radio will still work OK at 12.5kz but RSM with a spectrum analyser will spot you!