Date   
Re: Amel's suggestion to run the Volvo D3-110 (A54) daily while on passage

Jamie Wendell
 

Scott, Jamie Wendell here on Phantom.
As you may recall when we met last year, I told you I had saltwater migration into my D3-110 on my Amel 54. No one could positively identify why that happened, but the engine was toast. There is a long thread from 2015/2016 about that.
I replaced with a D3-150 and reworked the exhaust from the muffler to the discharge flapper. I upped the size to 90mm and replaced the flapper to match. The original was 90 to the muffler but only 76 downstream. I also shortened the loop significantly.
I have had no problems since.
Hope all is well with you guys. Enjoy PR.
Maybe see you next winter when I head back down.
Jamie
Phantom A54

Re: Too many VHF aerials?

Jean-Pierre Massicotte
 

Bravo!

Jp, Santorin #51 Vanille

On Tue., Jan. 7, 2020, 18:12 Brent Cameron, <brentcameron61@...> wrote:
There are a bunch of issues here and far too many to respond to each email sent individually so I’ll try to put down some basic principles and hopefully all will become clear.  

  1. VHF band antennas can interfere with each other (or any other similar shaped long metal object) if they are within a wavelength of each other which for VHF is about 2 metres  at the same plane (I.e. they won’t interfere if they are stacked one on top of each other (which really isn’t practical but it is true).  This means that an antenna on top of the Mizzen will NOT interfere in any significant way with one on top of the Main but two Antennas on the same mast will interfere badly and should never be done.  
  2. AIS transmits over VHF level frequencies (which are generally around 156-162MHz) but the VHF frequency range that we use for communications (156-157Mhz) and the AIS range (162Mhz) are fairly widely separated within the VHF band (with a few exceptions - the VHF weather channel for instance is around 162Mhz as well.)
  3. VHF Antennas are tuned for very specific frequencies…. People think that because they have a VHF antenna and an antenna splitter they are good…. If you have a typical Shakespeare 4’ antenna, it has a working range of 155.3 to 158.3Mhz while keeping the Standing Wave Ratio less than 3:1 (1:1 is perfect but less than 3 to 1 can be acceptable.  The SWR is a measure of how much power is sent out by the antenna and how much is reflected back (and lost).  The VHF antennas are generally optimized for VHF channel 16 (156.8Mhz) and the SWR of the antenna is optimized there but falls off rapidly on either side of that - think of a parabolic curve… the further away from the optimal tuning, the worse it gets exponentially.  For instance the typical 4’ Shakespeare 5400 has a pretty good SWR of 1.18:1  at Channel 16 but it can only hold the SWR between 2 to 1 within 5Mhz of that and it falls off the cliff beyond that.  That’s why they sell dedicated AIS antennas or antennas that are tuned midway between the two bands and have a broad enough SWR curve to be able to keep both within 3:1). The Shakespeare 5396 AIS antenna is tuned optimally at 158Mhz but again can keep the SWR within 2:1 down to 153Mhz and up to 163Mhz… so not optimal for Channel 16 or AIS but OK for both.  Takeaway, do not use a standard VHF antenna for AIS as it is very suboptimal and you may end up losing much of your power (which is already only 5W compared to the 25W of your VHF).
  4. Antenna splitters allow you to use the VHF antenna (or a combined VHF/AIS antenna WHEN YOU ARE NOT TRANSMITTING but they still can’t fix your antenna tuning.   I know we don’t spend a lot of time actually transmitting but it is worth noting that your AIS system is running blind when you transmit on VHF if you use a splitter and if you understand how AIS works, each station gets a small slice of time to transmit its particulars before moving on to the next…. So it wouldn’t be impossible to cover up a boat that might be in your danger zone with back and forth transmissions.  
  5. VHF signals are line of sight (well they will actually go 4/3 times the radius but let's not get too picky) so height matters (getting the antenna up helps extend the range that your antenna can see over the horizon at sea level.  Unfortunately, VHF antennas are also vertically polarized which means they are VERY directional (they send their signal out perpendicular to their axis and they are much better when longer.  This means that a 4’ antenna with a 3dB gain will have half the power of an 8’ antenna with a 6dB gain (or an 8' has twice the radiated power of a 4') and a 16’ antenna will have a 9dB gain (twice again or 4 times that of a 4’ antenna).  Unfortunately, as the power goes up, the signal also gets flatter in plane.  The 4’ antenna’s signal is roughly spherical but as you go up in power, the signal shape extends out perpendicularly from the antenna so it gets worse and worse when the antenna is pointed away from the source.  That’s why you don’t see 8' & 16’ antennas on sailboats (or monohulls at least) because we put them up on the mast and the rolling of the boat can inadvertently “aim” the antenna away from our targets to the point where you can’t pick up much at all in rough seas.   So, we live with 4’ antennas but try to put them up as high as we can to extend the range.  (This is why the Coast Guard can broadcast and receive so well from shore… their antennas are turned and optimized for both height and range).  
  6. Our VHF radios can typically broadcast at 25W or 1W while our class B AIS radios are limited to only 5W (unlike the Class A used on commercial ships).  Similarly, your handheld VHF is probably setup to broadcast at 1W but has a 5W high power setting.   It should be noted that the watt rating does not affect range but it does provide the ability to overcome another signal (or noise) weaker signal and take over the channel.  At 25W, your 4’ VHF 3dB antenna at the top of your mast can easily provide VHF communications to the horizon (as seen from the top of your mast) but you may have more issues with the 5W Class B AIS in noisy conditions.  You probably notice this yourself when you transmit on low power around the marine but have to switch to high power offshore.
  7. The distance in nautical miles that your antenna can see can be approximated by the formula 1.22 * square root of the height of the antenna above the surface in feet.   A Super Maramu has a mast height of about 66’ so an antenna there could see about 9.9nm.   "Hang on… “  I can hear you saying, "I can talk to people way farther out than that…" yes, but you have to factor in the height of THEIR antennas too..  If they were also in a Super Maramu you could talk to them out to about 20 miles.   From pictures, it appears to me that the mizzen on a Super Maramu is about 80% of the height of the main so let’s say it’s at 53’.  That means an AIS antenna on the mizzen could “only” see 8.9 miles (plus what ever the height of the transmitting antenna was which is independent).  So while putting the antenna on the main gives you one more mile of range, it isn’t significant in the scheme of things.  Bouncing off the troposphere also can get you some additional range but that is very atmospheric dependant so we shouldn’t count on it.  
  8. While DSC does mean Digital Selective Calling, VHF radios so equipped still send out the “digital” signal over the analog VHF much like an old style modem would translate our computers binary information  over our telephone lines - think of the analog signal like a bunch of sine waves all intertwined but the digital signals are just two specific frequencies sent over them  like the old modem squeals you would hear on your fax machines.  So the Digital signals are really just super fast 1’s and 0’s transmitted over analog radio waves that your radio can discriminate and make sense of.  Clear as mud?  
So looking at all that, what are the best options for VHF and AIS?
  1. Best - A 4’ dedicated and optimized antenna for VHF on the main mast so you can transmit to the coast guard when needed.  Luckily your Amel already has this.  Add to this a 4’ dedicated AIS SPECIFIC antenna (optimized for 162MHz) on the Mizzen but a generic “AIS” antenna that is optimized for both bands would do as well.  No splitter.
  2. Less optimally, add a splitter and then replace the old VHF optimized antenna for a VHF & AIS optimized one  (I.e  optimized midway between the two bands) at the top of the main mast
  3. Worst, your old VHF tuned antenna at the main with a splitter.
I should mention that you can easily make all of the above optimizations completely irrelevant by having had wiring/connections to your antenna(s). The Offshore Safety Regulations used for offshore racing dictate that your coaxial cable have a signal loss of no more than 2.2dB (a 40% signal loss) between your radio and your antenna.   If we use an optimistic length of only 25 metres as the length of the cable from the radio up to the antenna, then the standard RG-58 coax cable would generate 4.7dB of loss assuming no connection or splitter losses.  If you use RG-8X, you are at 3.8dB and with less common RG-8U, you are at 2.0dB…. So you really should be using at least LMR-400 cable (1.3dB) which I suspect very few are.   Of course one bad connection with the crappy standard PL259 bayonet connectors that ship with the standard Shakespeare antennas puts it all for naught as well… you should really make sure you fill them with dielectric grease and then waterproof them with tape/heat shrink.  

I know this is a lot to absorb but having been in situations where we weren’t seen even at a couple of miles, I’ve done a LOT of study on how to create the best setup and distilled it here as much as I could.  Practical Sailor has done a good series to get you started on this and you can learn a lot by following all the links.    
 

Brent Cameron, Future Amel owner & Amel Owner's Registry Moderator

--
Brent Cameron

Future Amel Owner & Amel Owner Registry Moderator

Oro-Medonte, Ontario, Canada

Re: Too many VHF aerials?

Thomas Peacock
 

Whoa! What a great dissertation. Thanks.

One question that has nagged me since we got AIS:

Our Raymarine chartplotter has several symbols for targets: one for big commercial, one for sail, one for small motor, one for passenger, and a generic symbol, perhaps useful if a transmitting vessel’s AIS has not identified itself as to vessel type. Sometimes I can see a generic AIS target, and when I click on it, all it will give me is distance and MMSI number. As it gets closer, it will then morph into a specific symbol, say, sailboat. Then if I click I get everything, vessel name, speed, course, etc.

Most other digital communications are sent in packets, which, as I see it, if true for AIS, the packet should be quite compact and contain all of the data. I either receive the packet, or error checking tells me that I don’t. Why, at some distances, do I get only partial information?

Not that it’s that important, just curious. Thanks.

Tom Peacock
SM 240 Aletes
Martinique

On Jan 7, 2020, at 5:11 PM, Brent Cameron <brentcameron61@...> wrote:

There are a bunch of issues here and far too many to respond to each email sent individually so I’ll try to put down some basic principles and hopefully all will become clear.  

  1. VHF band antennas can interfere with each other (or any other similar shaped long metal object) if they are within a wavelength of each other which for VHF is about 2 metres  at the same plane (I.e. they won’t interfere if they are stacked one on top of each other (which really isn’t practical but it is true).  This means that an antenna on top of the Mizzen will NOT interfere in any significant way with one on top of the Main but two Antennas on the same mast will interfere badly and should never be done.  
  2. AIS transmits over VHF level frequencies (which are generally around 156-162MHz) but the VHF frequency range that we use for communications (156-157Mhz) and the AIS range (162Mhz) are fairly widely separated within the VHF band (with a few exceptions - the VHF weather channel for instance is around 162Mhz as well.)
  3. VHF Antennas are tuned for very specific frequencies…. People think that because they have a VHF antenna and an antenna splitter they are good…. If you have a typical Shakespeare 4’ antenna, it has a working range of 155.3 to 158.3Mhz while keeping the Standing Wave Ratio less than 3:1 (1:1 is perfect but less than 3 to 1 can be acceptable.  The SWR is a measure of how much power is sent out by the antenna and how much is reflected back (and lost).  The VHF antennas are generally optimized for VHF channel 16 (156.8Mhz) and the SWR of the antenna is optimized there but falls off rapidly on either side of that - think of a parabolic curve… the further away from the optimal tuning, the worse it gets exponentially.  For instance the typical 4’ Shakespeare 5400 has a pretty good SWR of 1.18:1  at Channel 16 but it can only hold the SWR between 2 to 1 within 5Mhz of that and it falls off the cliff beyond that.  That’s why they sell dedicated AIS antennas or antennas that are tuned midway between the two bands and have a broad enough SWR curve to be able to keep both within 3:1). The Shakespeare 5396 AIS antenna is tuned optimally at 158Mhz but again can keep the SWR within 2:1 down to 153Mhz and up to 163Mhz… so not optimal for Channel 16 or AIS but OK for both.  Takeaway, do not use a standard VHF antenna for AIS as it is very suboptimal and you may end up losing much of your power (which is already only 5W compared to the 25W of your VHF).
  4. Antenna splitters allow you to use the VHF antenna (or a combined VHF/AIS antenna WHEN YOU ARE NOT TRANSMITTING but they still can’t fix your antenna tuning.   I know we don’t spend a lot of time actually transmitting but it is worth noting that your AIS system is running blind when you transmit on VHF if you use a splitter and if you understand how AIS works, each station gets a small slice of time to transmit its particulars before moving on to the next…. So it wouldn’t be impossible to cover up a boat that might be in your danger zone with back and forth transmissions.  
  5. VHF signals are line of sight (well they will actually go 4/3 times the radius but let's not get too picky) so height matters (getting the antenna up helps extend the range that your antenna can see over the horizon at sea level.  Unfortunately, VHF antennas are also vertically polarized which means they are VERY directional (they send their signal out perpendicular to their axis and they are much better when longer.  This means that a 4’ antenna with a 3dB gain will have half the power of an 8’ antenna with a 6dB gain (or an 8' has twice the radiated power of a 4') and a 16’ antenna will have a 9dB gain (twice again or 4 times that of a 4’ antenna).  Unfortunately, as the power goes up, the signal also gets flatter in plane.  The 4’ antenna’s signal is roughly spherical but as you go up in power, the signal shape extends out perpendicularly from the antenna so it gets worse and worse when the antenna is pointed away from the source.  That’s why you don’t see 8' & 16’ antennas on sailboats (or monohulls at least) because we put them up on the mast and the rolling of the boat can inadvertently “aim” the antenna away from our targets to the point where you can’t pick up much at all in rough seas.   So, we live with 4’ antennas but try to put them up as high as we can to extend the range.  (This is why the Coast Guard can broadcast and receive so well from shore… their antennas are turned and optimized for both height and range).  
  6. Our VHF radios can typically broadcast at 25W or 1W while our class B AIS radios are limited to only 5W (unlike the Class A used on commercial ships).  Similarly, your handheld VHF is probably setup to broadcast at 1W but has a 5W high power setting.   It should be noted that the watt rating does not affect range but it does provide the ability to overcome another signal (or noise) weaker signal and take over the channel.  At 25W, your 4’ VHF 3dB antenna at the top of your mast can easily provide VHF communications to the horizon (as seen from the top of your mast) but you may have more issues with the 5W Class B AIS in noisy conditions.  You probably notice this yourself when you transmit on low power around the marine but have to switch to high power offshore.
  7. The distance in nautical miles that your antenna can see can be approximated by the formula 1.22 * square root of the height of the antenna above the surface in feet.   A Super Maramu has a mast height of about 66’ so an antenna there could see about 9.9nm.   "Hang on… “  I can hear you saying, "I can talk to people way farther out than that…" yes, but you have to factor in the height of THEIR antennas too..  If they were also in a Super Maramu you could talk to them out to about 20 miles.   From pictures, it appears to me that the mizzen on a Super Maramu is about 80% of the height of the main so let’s say it’s at 53’.  That means an AIS antenna on the mizzen could “only” see 8.9 miles (plus what ever the height of the transmitting antenna was which is independent).  So while putting the antenna on the main gives you one more mile of range, it isn’t significant in the scheme of things.  Bouncing off the troposphere also can get you some additional range but that is very atmospheric dependant so we shouldn’t count on it.  
  8. While DSC does mean Digital Selective Calling, VHF radios so equipped still send out the “digital” signal over the analog VHF much like an old style modem would translate our computers binary information  over our telephone lines - think of the analog signal like a bunch of sine waves all intertwined but the digital signals are just two specific frequencies sent over them  like the old modem squeals you would hear on your fax machines.  So the Digital signals are really just super fast 1’s and 0’s transmitted over analog radio waves that your radio can discriminate and make sense of.  Clear as mud?  
So looking at all that, what are the best options for VHF and AIS?
  1. Best - A 4’ dedicated and optimized antenna for VHF on the main mast so you can transmit to the coast guard when needed.  Luckily your Amel already has this.  Add to this a 4’ dedicated AIS SPECIFIC antenna (optimized for 162MHz) on the Mizzen but a generic “AIS” antenna that is optimized for both bands would do as well.  No splitter.
  2. Less optimally, add a splitter and then replace the old VHF optimized antenna for a VHF & AIS optimized one  (I.e  optimized midway between the two bands) at the top of the main mast
  3. Worst, your old VHF tuned antenna at the main with a splitter.
I should mention that you can easily make all of the above optimizations completely irrelevant by having had wiring/connections to your antenna(s). The Offshore Safety Regulations used for offshore racing dictate that your coaxial cable have a signal loss of no more than 2.2dB (a 40% signal loss) between your radio and your antenna.   If we use an optimistic length of only 25 metres as the length of the cable from the radio up to the antenna, then the standard RG-58 coax cable would generate 4.7dB of loss assuming no connection or splitter losses.  If you use RG-8X, you are at 3.8dB and with less common RG-8U, you are at 2.0dB…. So you really should be using at least LMR-400 cable (1.3dB) which I suspect very few are.   Of course one bad connection with the crappy standard PL259 bayonet connectors that ship with the standard Shakespeare antennas puts it all for naught as well… you should really make sure you fill them with dielectric grease and then waterproof them with tape/heat shrink.  

I know this is a lot to absorb but having been in situations where we weren’t seen even at a couple of miles, I’ve done a LOT of study on how to create the best setup and distilled it here as much as I could.  Practical Sailor has done a good series to get you started on this and you can learn a lot by following all the links.    
 

Brent Cameron, Future Amel owner & Amel Owner's Registry Moderator

--
Brent Cameron

Future Amel Owner & Amel Owner Registry Moderator

Oro-Medonte, Ontario, Canada


Re: Too many VHF aerials?

Brent Cameron
 

There are a bunch of issues here and far too many to respond to each email sent individually so I’ll try to put down some basic principles and hopefully all will become clear.  

  1. VHF band antennas can interfere with each other (or any other similar shaped long metal object) if they are within a wavelength of each other which for VHF is about 2 metres  at the same plane (I.e. they won’t interfere if they are stacked one on top of each other (which really isn’t practical but it is true).  This means that an antenna on top of the Mizzen will NOT interfere in any significant way with one on top of the Main but two Antennas on the same mast will interfere badly and should never be done.  
  2. AIS transmits over VHF level frequencies (which are generally around 156-162MHz) but the VHF frequency range that we use for communications (156-157Mhz) and the AIS range (162Mhz) are fairly widely separated within the VHF band (with a few exceptions - the VHF weather channel for instance is around 162Mhz as well.)
  3. VHF Antennas are tuned for very specific frequencies…. People think that because they have a VHF antenna and an antenna splitter they are good…. If you have a typical Shakespeare 4’ antenna, it has a working range of 155.3 to 158.3Mhz while keeping the Standing Wave Ratio less than 3:1 (1:1 is perfect but less than 3 to 1 can be acceptable.  The SWR is a measure of how much power is sent out by the antenna and how much is reflected back (and lost).  The VHF antennas are generally optimized for VHF channel 16 (156.8Mhz) and the SWR of the antenna is optimized there but falls off rapidly on either side of that - think of a parabolic curve… the further away from the optimal tuning, the worse it gets exponentially.  For instance the typical 4’ Shakespeare 5400 has a pretty good SWR of 1.18:1  at Channel 16 but it can only hold the SWR between 2 to 1 within 5Mhz of that and it falls off the cliff beyond that.  That’s why they sell dedicated AIS antennas or antennas that are tuned midway between the two bands and have a broad enough SWR curve to be able to keep both within 3:1). The Shakespeare 5396 AIS antenna is tuned optimally at 158Mhz but again can keep the SWR within 2:1 down to 153Mhz and up to 163Mhz… so not optimal for Channel 16 or AIS but OK for both.  Takeaway, do not use a standard VHF antenna for AIS as it is very suboptimal and you may end up losing much of your power (which is already only 5W compared to the 25W of your VHF).
  4. Antenna splitters allow you to use the VHF antenna (or a combined VHF/AIS antenna WHEN YOU ARE NOT TRANSMITTING but they still can’t fix your antenna tuning.   I know we don’t spend a lot of time actually transmitting but it is worth noting that your AIS system is running blind when you transmit on VHF if you use a splitter and if you understand how AIS works, each station gets a small slice of time to transmit its particulars before moving on to the next…. So it wouldn’t be impossible to cover up a boat that might be in your danger zone with back and forth transmissions.  
  5. VHF signals are line of sight (well they will actually go 4/3 times the radius but let's not get too picky) so height matters (getting the antenna up helps extend the range that your antenna can see over the horizon at sea level.  Unfortunately, VHF antennas are also vertically polarized which means they are VERY directional (they send their signal out perpendicular to their axis and they are much better when longer.  This means that a 4’ antenna with a 3dB gain will have half the power of an 8’ antenna with a 6dB gain (or an 8' has twice the radiated power of a 4') and a 16’ antenna will have a 9dB gain (twice again or 4 times that of a 4’ antenna).  Unfortunately, as the power goes up, the signal also gets flatter in plane.  The 4’ antenna’s signal is roughly spherical but as you go up in power, the signal shape extends out perpendicularly from the antenna so it gets worse and worse when the antenna is pointed away from the source.  That’s why you don’t see 8' & 16’ antennas on sailboats (or monohulls at least) because we put them up on the mast and the rolling of the boat can inadvertently “aim” the antenna away from our targets to the point where you can’t pick up much at all in rough seas.   So, we live with 4’ antennas but try to put them up as high as we can to extend the range.  (This is why the Coast Guard can broadcast and receive so well from shore… their antennas are turned and optimized for both height and range).  
  6. Our VHF radios can typically broadcast at 25W or 1W while our class B AIS radios are limited to only 5W (unlike the Class A used on commercial ships).  Similarly, your handheld VHF is probably setup to broadcast at 1W but has a 5W high power setting.   It should be noted that the watt rating does not affect range but it does provide the ability to overcome another signal (or noise) weaker signal and take over the channel.  At 25W, your 4’ VHF 3dB antenna at the top of your mast can easily provide VHF communications to the horizon (as seen from the top of your mast) but you may have more issues with the 5W Class B AIS in noisy conditions.  You probably notice this yourself when you transmit on low power around the marine but have to switch to high power offshore.
  7. The distance in nautical miles that your antenna can see can be approximated by the formula 1.22 * square root of the height of the antenna above the surface in feet.   A Super Maramu has a mast height of about 66’ so an antenna there could see about 9.9nm.   "Hang on… “  I can hear you saying, "I can talk to people way farther out than that…" yes, but you have to factor in the height of THEIR antennas too..  If they were also in a Super Maramu you could talk to them out to about 20 miles.   From pictures, it appears to me that the mizzen on a Super Maramu is about 80% of the height of the main so let’s say it’s at 53’.  That means an AIS antenna on the mizzen could “only” see 8.9 miles (plus what ever the height of the transmitting antenna was which is independent).  So while putting the antenna on the main gives you one more mile of range, it isn’t significant in the scheme of things.  Bouncing off the troposphere also can get you some additional range but that is very atmospheric dependant so we shouldn’t count on it.  
  8. While DSC does mean Digital Selective Calling, VHF radios so equipped still send out the “digital” signal over the analog VHF much like an old style modem would translate our computers binary information  over our telephone lines - think of the analog signal like a bunch of sine waves all intertwined but the digital signals are just two specific frequencies sent over them  like the old modem squeals you would hear on your fax machines.  So the Digital signals are really just super fast 1’s and 0’s transmitted over analog radio waves that your radio can discriminate and make sense of.  Clear as mud?  
So looking at all that, what are the best options for VHF and AIS?
  1. Best - A 4’ dedicated and optimized antenna for VHF on the main mast so you can transmit to the coast guard when needed.  Luckily your Amel already has this.  Add to this a 4’ dedicated AIS SPECIFIC antenna (optimized for 162MHz) on the Mizzen but a generic “AIS” antenna that is optimized for both bands would do as well.  No splitter.
  2. Less optimally, add a splitter and then replace the old VHF optimized antenna for a VHF & AIS optimized one  (I.e  optimized midway between the two bands) at the top of the main mast
  3. Worst, your old VHF tuned antenna at the main with a splitter.
I should mention that you can easily make all of the above optimizations completely irrelevant by having had wiring/connections to your antenna(s). The Offshore Safety Regulations used for offshore racing dictate that your coaxial cable have a signal loss of no more than 2.2dB (a 40% signal loss) between your radio and your antenna.   If we use an optimistic length of only 25 metres as the length of the cable from the radio up to the antenna, then the standard RG-58 coax cable would generate 4.7dB of loss assuming no connection or splitter losses.  If you use RG-8X, you are at 3.8dB and with less common RG-8U, you are at 2.0dB…. So you really should be using at least LMR-400 cable (1.3dB) which I suspect very few are.   Of course one bad connection with the crappy standard PL259 bayonet connectors that ship with the standard Shakespeare antennas puts it all for naught as well… you should really make sure you fill them with dielectric grease and then waterproof them with tape/heat shrink.  

I know this is a lot to absorb but having been in situations where we weren’t seen even at a couple of miles, I’ve done a LOT of study on how to create the best setup and distilled it here as much as I could.  Practical Sailor has done a good series to get you started on this and you can learn a lot by following all the links.    
 

Brent Cameron, Future Amel owner & Amel Owner's Registry Moderator

--
Brent Cameron

Future Amel Owner & Amel Owner Registry Moderator

Oro-Medonte, Ontario, Canada

Re: Too many VHF aerials?

Alan Leslie
 

Yes it can be an issue
See : https://www.seamagazine.com/importance-antenna-placement/

We use a splitter on our main mast VHF antenna for Ais and Fixed mount VHF. It works very well...and better IMO than having a proliferation of antennae

Cheers
Alan
Elyse SM437

Re: Sidepower SP 155 TCi needed

Scott SV Tengah
 

Sharing is caring, so here are the wiring diagrams and schematics for the A54 bow thruster that I got from Amel.

I also added the instructions to replace the sacrificial flexible coupling, which I have had to do.

Hope this helps someone.

--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com

Re: Too many VHF aerials?

Scott SV Tengah
 

I just replaced my main mast VHF antenna and traced all the other ones. On our A54 main mast, there are two Banten aerials, one for the VHF and the other for the FM/AM radio. 

On the mizzen, we have the AIS antenna, connected to our Furuno FA-50. As you may know, AIS transmits on VHF frequencies. The second antenna on the mizzen is the weather fax, which I don't really use. Based on my understanding, it's important that the VHF and AIS antennas are at least half a wavelength (a meter) apart horizontally and ideally on a different vertical plane. That's how Amel installed it on my A54. So if you're going to add an AIS antenna, put it on the mizzen, which it seems you're planning on doing.

Having VHF and AIS on the same mast will negatively impact both. That said, in reality, Class B AIS doesn't transmit that often and we don't blabber that much on VHF that I'd be too worried about that affecting AIS that often. :)

--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com

Re: Too many VHF aerials?

Arno Luijten
 

Why do you say too many? Are they interfering with each other. We have two on te main mast and one on the mizzen; AIS, VHF and WeatherFax. They seem to get along.  In my marina the is currently a motorboat with 11 of these white sticks, make me wonder what they are for. But it also has 4 domes and 2 Radars. The owner must be very important :-)

Regards,
Arno Luijten
SV Luna,
A54-121

Re: Amel's suggestion to run the Volvo D3-110 (A54) daily while on passage

Porter McRoberts
 

Thank to Oliver and also to Scott. Great question!  
Porter A54-154

Excuse the errors.  
Sent from my IPhone 
Www.fouribis.com

On Jan 7, 2020, at 11:18 AM, Scott SV Tengah <Scott.nguyen@...> wrote:

Fantastic information from Olivier.  Thank you. I presume the flap is a specific Amel part or can we buy it elsewhere? I am totally for supporting Amel but the shipping costs from France get a bit high for a small part. :)

On another note, what is the general guideline for using the Volvo D3-110 and the Onan when the boat is heeled over? I do recall reading the Onan spec that it shouldn't be used at more than 10 degrees constant with short bursts to 20degrees. I can definitely hear a change in genset note when the boat is rolling and it is not related to the exhaust outlet going underwater. 

Back in my car racing days, I was very aware of oil starvation when the oil sloshes to the side of the oil sump while cornering. The solution there was either baffles (helps) or a dry sump. Is this a concern with our marine engines/genset?

--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com

Re: Batteries

Danny and Yvonne SIMMS
 

We bought a set of deep cycle lead acid batteries from West Marine in Newport Rhode Island in 2009, got 8 years out of them. They would have lasted longer if I hadn't messed up by leaving the freezer open and switched on when I left the boat on its mooring for 6 weeks. I leave two fridges on to use the power from wind gen and solar but hit the wrong breaker.  They were labelled "West Marine". I replaced them with Trojans in New Zealand 

Regards

Danny

SM 299

Ocean Pearl

On 08 January 2020 at 04:15 Chuck_Kim_Joy <clacey9@...> wrote:

Have not tried West Marine. Looking for lead acid deep cycle. Preferably Trojan good price good battery. Thanks for your reply. 
Chuck 
Joy #388

On Tue, Jan 7, 2020 at 11:08 AM Mark Erdos < mcerdos@...> wrote:

Have you tried the local Costco? West Marine? It may help if you state the type of batteries you seek.

 

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Vista Mar, Panama

www.creampuff.us

 

From: main@AmelYachtOwners.groups.io [mailto:main@AmelYachtOwners.groups.io] On Behalf Of Chuck_Kim_Joy
Sent: Tuesday, January 7, 2020 9:52 AM
To: main@AmelYachtOwners.groups.io
Subject: [AmelYachtOwners] Batteries

 

Greetings All and Happy New Year!

In Puerto Rico now and looking for batteries. Can anyone recommend a supplier. Hoping Gary S. will pipe in I know he spends a lot of time here. Thanks in advance. 

 


 

 

Re: Amel's suggestion to run the Volvo D3-110 (A54) daily while on passage

Mark Erdos
 

Although not fitted with a Volvo or a 54, Cream puff is fitted with a Vetus Waterlock muffler. Even if you do not have the Vetus model, the setup for the water-lock is probably very similar. The muffler is fitted with a drain screw. Undoing this screw while underway would absolutely eliminated any chance of water back-flowing into the engine. If you opt to do this, it might be advisable to attach a hose pointed toward the bilge. And, of course, do not run the engine with the water-lock drain open.

 

So, for those of you not wanting to run the engine at all while underway on long passages, this is an alternate option.

 

Image result for vetus waterlock

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Vista Mar, Panama

www.creampuff.us

 

 

Re: Too many VHF aerials?

Ryan Meador
 

Hi Mark,

Do you have a Class A VHF?  Those are the type that use two antennas for DSC, but I've never seen one in the flesh -- most recreational boats use Class D, with a shared antenna.

On our boat, we have one antenna on each mast.  The main mast is split between the nav station VHF and AIS, and the mizzen is connected to the helm VHF.  Both VHFs have DSC.  This setup has worked well for us.  If the splitter fails, it's easy to connect the nav station VHF directly to the radio, and I believe we also have a jumper between the helm and nav station so we can swap the antennas to either radio by plugging a few wires (that's what the wire is labeled as by the previous owner... I haven't tried).  And we also have a handheld as a third backup.

I think having the AIS on the main mast for better range outweighs any drawbacks of having a splitter.

Ryan and Kelly
SM 233 Iteration
Boston, MA, USA


On Tue, Jan 7, 2020 at 12:10 PM Thomas Peacock <peacock8491@...> wrote:
Hi Mark,

We also have one VHF on the main mast, and one on the mizzen. Maybe I have misunderstood the configuration, but here is how I think we have it:

The main mast antenna is hooked up to our VHF analog radio. That radio also has a button for DSC (the D standing for digital), but I always assumed that the DSC signal was transmitted via the same antenna as the analog VHF signal, not on a separate antenna. At least, when I installed the radio, there was only one antenna output terminal on the radio, so I don’t see how it would use two antennas.

Our mizzen antenna hooks up directly to the AIS transceiver, no other devices use it. 

If the either VHF antenna failed, we also have a spare antenna on board that could be partially hoisted for elevation.

Tom Peacock
SM 240 Aletes
Martinique



On Jan 7, 2020, at 11:56 AM, marklesparkle59 <marklesparkle59@...> wrote:

On my main mast there is the main VHF Radio aerial, on the mizzen are the DSC aerial and the Emergency VHF aerial and I would like to add an AIS aerial to avoid a splitter. I am considering replacing the Emergency aerial with the AIS and using a bolt on emergency. How have other owners coped with this proliferation? 

Mark Porter
Sea Hobo
SHARKI #96
CARDIFF Marine Village

Too many VHF aerials?

marklesparkle59
 

On my main mast there is the main VHF Radio aerial, on the mizzen are the DSC aerial and the Emergency VHF aerial and I would like to add an AIS aerial to avoid a splitter. I am considering replacing the Emergency aerial with the AIS and using a bolt on emergency. How have other owners coped with or avoided this proliferation? 

Mark Porter
Sea Hobo
SHARKI #96
CARDIFF Marine Village

Re: Windsreen replacement

Arno Luijten
 

Hi Paul,

Last spring I got an offer to have them replaced for a little over 900 euro by:

SARL caraibe menuiserie le Carénage
97290 LE MARIN
Tél : 0596537663
Tél portable : 0696257604
Fax : 0596537663
Site web :
Email : serge@...

I was not able to get to Martinique at that time so I have no idea about quality, etc.

Regards,

Arno Luijten
SV Luna,
A54-121

Re: Too many VHF aerials?

Thomas Peacock
 

Hi Mark,

We also have one VHF on the main mast, and one on the mizzen. Maybe I have misunderstood the configuration, but here is how I think we have it:

The main mast antenna is hooked up to our VHF analog radio. That radio also has a button for DSC (the D standing for digital), but I always assumed that the DSC signal was transmitted via the same antenna as the analog VHF signal, not on a separate antenna. At least, when I installed the radio, there was only one antenna output terminal on the radio, so I don’t see how it would use two antennas.

Our mizzen antenna hooks up directly to the AIS transceiver, no other devices use it. 

If the either VHF antenna failed, we also have a spare antenna on board that could be partially hoisted for elevation.

Tom Peacock
SM 240 Aletes
Martinique



On Jan 7, 2020, at 11:56 AM, marklesparkle59 <marklesparkle59@...> wrote:

On my main mast there is the main VHF Radio aerial, on the mizzen are the DSC aerial and the Emergency VHF aerial and I would like to add an AIS aerial to avoid a splitter. I am considering replacing the Emergency aerial with the AIS and using a bolt on emergency. How have other owners coped with this proliferation? 

Mark Porter
Sea Hobo
SHARKI #96
CARDIFF Marine Village

Re: Batteries

Chuck_Kim_Joy
 


Is this Dr. James Cromie? Kim and I were just talking about you and wondered if you and your lovely family ever made it down. We hope you are doing well and your parents are at peace with your sailing adventures 😉. Hope to cross paths and catch up. We are heading back to St.Martin by early February then a leisurely pace south to Trinidad by end of season. Happy new year!
All the best,
Chuck and Kim 


On Tue, Jan 7, 2020 at 12:53 PM James Cromie via Groups.Io <jamescromie=yahoo.com@groups.io> wrote:
Chuck - By the way, I’m enjoying espresso several times a day ever since I picked up the same machine that I saw on your boat back in Cuttyhunk!  
More Caffeine = more projects done in a day and more productive deck hands!

Best,
James
On Jan 7, 2020, at 11:48 AM, Chuck_Kim_Joy <clacey9@...> wrote:

Thanks James. I am in contact with them and like the Trojans. Can't seem to find them in stock on the island so might have to ship. Thanks 
Chuck 
Joy #388

On Tue, Jan 7, 2020 at 11:28 AM James Cromie via Groups.Io <jamescromie=yahoo.com@groups.io> wrote:
Hi Chuck - 
I purchased a full set of Trojan 31XHS and a DEKA 1231 starter battery from DCBattery “dot” com.  
They provided excellent service and shipped them all to Aruba for only $230.  
The trojans were $205 each, and the DEKA was $135.  I thought it was a good deal to get the exact batteries I wanted.   Shipping to PR and any taxes should be even easier. 

All batteries arrived in good condition based upon personally load testing them and manufacture dates were the same month as delivery to me. 

contact was Danny Rojas:  danny “at” dcbatter “dot” com

Best,
James
On Jan 7, 2020, at 8:52 AM, Chuck_Kim_Joy <clacey9@...> wrote:

Greetings All and Happy New Year!

In Puerto Rico now and looking for batteries. Can anyone recommend a supplier. Hoping Gary S. will pipe in I know he spends a lot of time here. Thanks in advance. 





Too many VHF aerials?

marklesparkle59
 

On my main mast there is the main VHF Radio aerial, on the mizzen are the DSC aerial and the Emergency VHF aerial and I would like to add an AIS aerial to avoid a splitter. I am considering replacing the Emergency aerial with the AIS and using a bolt on emergency. How have other owners coped with this proliferation? 

Mark Porter
Sea Hobo
SHARKI #96
CARDIFF Marine Village

Re: Batteries

James Cromie
 

Chuck - By the way, I’m enjoying espresso several times a day ever since I picked up the same machine that I saw on your boat back in Cuttyhunk!  
More Caffeine = more projects done in a day and more productive deck hands!

Best,
James

On Jan 7, 2020, at 11:48 AM, Chuck_Kim_Joy <clacey9@...> wrote:

Thanks James. I am in contact with them and like the Trojans. Can't seem to find them in stock on the island so might have to ship. Thanks 
Chuck 
Joy #388

On Tue, Jan 7, 2020 at 11:28 AM James Cromie via Groups.Io <jamescromie=yahoo.com@groups.io> wrote:
Hi Chuck - 
I purchased a full set of Trojan 31XHS and a DEKA 1231 starter battery from DCBattery “dot” com.  
They provided excellent service and shipped them all to Aruba for only $230.  
The trojans were $205 each, and the DEKA was $135.  I thought it was a good deal to get the exact batteries I wanted.   Shipping to PR and any taxes should be even easier. 

All batteries arrived in good condition based upon personally load testing them and manufacture dates were the same month as delivery to me. 

contact was Danny Rojas:  danny “at” dcbatter “dot” com

Best,
James
On Jan 7, 2020, at 8:52 AM, Chuck_Kim_Joy <clacey9@...> wrote:

Greetings All and Happy New Year!

In Puerto Rico now and looking for batteries. Can anyone recommend a supplier. Hoping Gary S. will pipe in I know he spends a lot of time here. Thanks in advance. 





Re: Batteries

Chuck_Kim_Joy
 

Thanks James. I am in contact with them and like the Trojans. Can't seem to find them in stock on the island so might have to ship. Thanks 
Chuck 
Joy #388

On Tue, Jan 7, 2020 at 11:28 AM James Cromie via Groups.Io <jamescromie=yahoo.com@groups.io> wrote:
Hi Chuck - 
I purchased a full set of Trojan 31XHS and a DEKA 1231 starter battery from DCBattery “dot” com.  
They provided excellent service and shipped them all to Aruba for only $230.  
The trojans were $205 each, and the DEKA was $135.  I thought it was a good deal to get the exact batteries I wanted.   Shipping to PR and any taxes should be even easier. 

All batteries arrived in good condition based upon personally load testing them and manufacture dates were the same month as delivery to me. 

contact was Danny Rojas:  danny “at” dcbatter “dot” com

Best,
James
On Jan 7, 2020, at 8:52 AM, Chuck_Kim_Joy <clacey9@...> wrote:

Greetings All and Happy New Year!

In Puerto Rico now and looking for batteries. Can anyone recommend a supplier. Hoping Gary S. will pipe in I know he spends a lot of time here. Thanks in advance. 


Re: Amel's suggestion to run the Volvo D3-110 (A54) daily while on passage

Scott SV Tengah
 

Fantastic information from Olivier.  Thank you. I presume the flap is a specific Amel part or can we buy it elsewhere? I am totally for supporting Amel but the shipping costs from France get a bit high for a small part. :)

On another note, what is the general guideline for using the Volvo D3-110 and the Onan when the boat is heeled over? I do recall reading the Onan spec that it shouldn't be used at more than 10 degrees constant with short bursts to 20degrees. I can definitely hear a change in genset note when the boat is rolling and it is not related to the exhaust outlet going underwater. 

Back in my car racing days, I was very aware of oil starvation when the oil sloshes to the side of the oil sump while cornering. The solution there was either baffles (helps) or a dry sump. Is this a concern with our marine engines/genset?

--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com