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Re: [Amel Yacht Owners] Range of AIS
Herbert Lackner
Trying to summarize:
Receiving mode: · General the splitter is splitting the signal to two (or more) receivers. If the signal - that has been splittet up – is not amplified again you loose 3dB (50% - because you split it up for two receivers). · Most oft he modern splitters are active splitters that have a built in amplifier, need power, and will amplify the splitted signal so that in the end no signal reduction should be on both (or more) receivers · Anyway there will be some signal loss because of additional connectors… that cannot be restored through amplifying
Sending Mode: · The splitter has to make sure that only one device sends at one time. In general they are designed in such a way, that the VHF signal has priority, that means that the AIS is only allowed to transmit if the VHF is not sending.
Splitter or no splitter: · When using an active splitter there should be no noteworthy difference between splitter or no splitter in transmitting or receiving · From a security point of view it is an additional piece of electronic that can fail. If so the decision hast o be made if VHF or AIS hast o be used, because only one of them can work. According to murphys law this can occur in a situation where nobody wants to remove the VHF /AIS cover to change the cables… · From a „ease of installation“ point it is much easier to install the splitter because its just connecting it, ready · Considering the costs it does not make a big difference (splitter is a little bit more expensive).
So, in the end, it is just the question if more reliability or additional installation effort is more important.
On our Santorin we use a Banten active splitter and a comar AIS class B transponder with one antenna without any receiving problems, but sometimes the AIS is not able to transmit and sends an Alarm. I could not find out if that is due to splitter problems but I will change this installation abyway in this year when we change the running rigging and service the mast and install an additional antenna on the mizzen for the AIS. I will keep the Splitter as a spare part, if fore any reason then one oft he antennas will fail I can still go back to the current situation with AIS and VHF on one antenna.
Fair winds
Herbert Kali Mera, SN120
Von: amelyachtowners@... [mailto:amelyachtowners@...] Im Auftrag von Patrick Mcaneny
Bob, That's interesting, I was told there would be a loss by the rep. for Garmin , approx. 2db, which was their argument for a dedicated antenna. I just did not and still don't understand why you have a loss assuming good connections and the antenna only servicing one unit at a time either vhf or ais. Thanks, Pat -----Original Message-----
From: drbobgray <drbobgray@...> To: amelyachtowners <amelyachtowners@...> Sent: Sat, Mar 22, 2014 4:08 pm Subject: RE: [Amel Yacht Owners] Range of AIS
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Re: [Amel Yacht Owners] Range of AIS
Patrick McAneny
Bob, That's interesting, I was told there would be a loss by the rep. for Garmin , approx. 2db, which was their argument for a dedicated antenna. I just did not and still don't understand why you have a loss assuming good connections and the antenna only servicing one unit at a time either vhf or ais. Thanks, Pat
-----Original Message----- From: drbobgray To: amelyachtowners Sent: Sat, Mar 22, 2014 4:08 pm Subject: RE: [Amel Yacht Owners] Range of AIS Hi,
I'm new to this users group and joined to listen and learn all about the Amel's while my family and I search for a well-maintained used SM53 to buy and use in the Great Lakes. Here's some theoretical numbers that I've calculated which may may be helpful in understanding what happens when using a 2-way splitter and a 3-way splitter: 2-way splitter...your theoretical insertion loss will be -3dB which is a 50% reduction. 3-way splitter...your theoretical insertion loss will be -4.77dB which is a 67% reduction. best, Bob |
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Re: [Amel Yacht Owners] Range of AIS
Bill & Judy Rouse <yahoogroups@...>
Thanks Bob, For everyone in the Amel Owner's Group, Robert (Bob) Gray, Ph.D. is at Penn State and is Associate Professor of Electrical Engineering/Electrical Engineering and Electrical Engineering Technology.
I thought I would add that bit of information so that you will place some weight on his calculations. Bob is too modest to have added it. He could be a great resource for us in some of our electrical challenges.
I hope you find your Super Maramu. Bill BeBe 387 On Sat, Mar 22, 2014 at 8:08 PM, <drbobgray@...> wrote:
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Re: [Amel Yacht Owners] Range of AIS
drbobgray@...
Hi,
I'm new to this users group and joined to listen and learn all about the Amel's while my family and I search for a well-maintained used SM53 to buy and use in the Great Lakes. Here's some theoretical numbers that I've calculated which may may be helpful in understanding what happens when using a 2-way splitter and a 3-way splitter: 2-way splitter...your theoretical insertion loss will be -3dB which is a 50% reduction. 3-way splitter...your theoretical insertion loss will be -4.77dB which is a 67% reduction. best, Bob |
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Re: [Amel Yacht Owners] Amel 54 and 55 measurements
Very interesting - could someone remind me of the formula for Max Hull speed using the waterline length as the basis?
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On 22 Mar 2014, at 17:07, sailormon <kimberlite@...> wrote:
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Re: [Amel Yacht Owners] Amel 54 and 55 measurements
Richard Piller <richard03801@...>
The Amel 54 is 56 overall 15.35 m on the water 4.8 M beam The 55 is 17.3 overall Hull 16.74 Waterline 14.85 Beam at waterline 4.14 Beam 4.99 Height over water 21.3 Full load 24 m tons On Mar 22, 2014, at 13:07, sailormon <kimberlite@...> wrote:
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Re: [Amel Yacht Owners] Amel 54 and 55 measurements
sailormon <kimberlite@...>
Peter, A meter is 39.37 inches. It puzzles me. Gw Eric
From: amelyachtowners@...
[mailto:amelyachtowners@...] On Behalf Of Peter Forbes
Sent: Saturday, March 22, 2014 5:08 AM To: amelyachtowners@... Subject: Re: [Amel Yacht Owners] Amel 54 and 55 measurements
Eric,
I'm fairly sure that there are 39 inches in a meter. So 17.2 x 39=670.8 inches divided by 12 for feet = 55.9 feet. I'm rather old fashioned in my maths! So I guess the deck length is 55.9 feet.
Then 16.4 m is 53.3 feet - I assume that is the water line length.
But some wise men like Joel or Bill should interrupt this and tell us the actual figures?
Best wishes
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Re: AIS App for IPAD & iPad navigation with WiFi
Mark Pitt
Hi Hanspeter:
I use iNavx for AIS display and for charting. It is a great product. It will also display all of your instrument data if you also route that through wifi. For the past two years, I have broadcast my AIS and instrument data on wifi by routing the NMEA streams through an old laptop on the nav table connected to an old wifi router. You do not need much bandwidth for this. One can use the free version of Polarcom to send any NMEA stream coming from a com port (USB) to wifi, and if you have more than one com port stream (one for AIS and one for instruments), just add the free version of GPSGate. I have also successfully tried the free software product nmearouter from nmearoute.com. The downside of this setup is the power draw of a laptop and a router. I have just purchased a small bit of hardware, a NMEA-to-wifi router, from www.vyacht.net for only 110 euros that will do the whole job at a very good price and with very low energy draw (1.5 watts under heavy-duty load). I will install it when I return to my boat in Turkey in 2 weeks. This eliminates the need for a laptop to convert NMEA streams and for a wifi router to broadcast them. The vyacht device uses 12 volt input and has the newest 802.11n router on a chip. Bernd Ocklin, guy who builds these in Sweden (bernd at vyacht.net), is a pleasure to work with and will ship his NMEA-to-wifi router anywhere. Best, Mark Pitt S/Y Sabbatical III, ASM #419, located in Kas, Turkey |
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Re: [Amel Yacht Owners] Amel 54 and 55 measurements
Richard03801 <richard03801@...>
The Amel 54 is 56 overall 15.35 m on the water 4.8 M beam The 55 is 17.3 overall Hull 16.74 Waterline 14.85 Beam at waterline 4.14 Beam 4.99 Height over water 21.3 Full load 24 m tons All dims in meters Regards Capt Richard Piller Yacht broker in Newport RI Cell 603 767 5330
Regards Richard Piller Cell 603 767 5330
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AIS App for IPAD
hanspeter baettig
I recently purchased the latest generation of an AIS Transponder (easy TRX2-IS-WiFi from Weatherdock) This System comes with in build VHF splitter,DVB-T splitter, integrated WiFi, integrated GPS antenna. I' looking now for an App for my Navigation IPad. Has somebody experieance with the App eg iAIS from Digital Yacht or SEAiq Open. Fair wind and a good sailing saison Hanspeter Tamango 2, SM #16 Krusadasi, Turkey |
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Re: [Amel Yacht Owners] Amel 54 and 55 measurements
Eric, I'm fairly sure that there are 39 inches in a meter. So 17.2 x 39=670.8 inches divided by 12 for feet = 55.9 feet. I'm rather old fashioned in my maths! So I guess the deck length is 55.9 feet. Then 16.4 m is 53.3 feet - I assume that is the water line length. But some wise men like Joel or Bill should interrupt this and tell us the actual figures? Best wishes On 22 Mar 2014, at 05:14, sailormon <kimberlite@...> wrote:
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Re: [Amel Yacht Owners] Amel 54 and 55 measurements
sailormon <kimberlite@...>
Peter, Isn’t 17.2 meters 56.4 feet? And 16.4 meters 53 feet that is the waterline? Fair Winds Eric Kimberlite SM 376
From: amelyachtowners@...
[mailto:amelyachtowners@...] On Behalf Of Peter Forbes
Sent: Friday, March 21, 2014 1:57 PM To: amelyachtowners@... Subject: Re: [Amel Yacht Owners] Amel 54 and 55 measurements
Eric,
My 54 user manual says:
Lh 16.4m Bh 4.7m Lmax 17.2m Bmax 4.8m
This could mean the LWL as we Brits call it is 16.4m and the Beam at WL is 4.7.
Max length - deck level 17.2 - max width at widest point is 4.8m
I hope that helps
On 21 Mar 2014, at 17:03, sailormon <kimberlite@...> wrote:
Hi, What is the length at the waterline of the Amel 54 and 55 and its beam? Fair Winds Eric Kimberlite SM 376
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Re: [Amel Yacht Owners] Amel 54 and 55 measurements
sailormon <kimberlite@...>
Peter, Thanks. Fair Winds Eric Kimberlite SM 376
From:
amelyachtowners@... [mailto:amelyachtowners@...] On
Behalf Of Peter Forbes
Eric,
My 54 user manual says:
Lh 16.4m Bh 4.7m Lmax 17.2m Bmax 4.8m
This could mean the LWL as we Brits call it is 16.4m and the Beam at WL is 4.7.
Max length - deck level 17.2 - max width at widest point is 4.8m
On 21 Mar 2014, at 17:03, sailormon <kimberlite@...> wrote:
Hi, What is the length at the waterline of the Amel 54 and 55 and its beam? Fair Winds Eric Kimberlite SM 376
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Re: [Amel Yacht Owners] Amel 54 and 55 measurements
Eric,
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My 54 user manual says: Lh 16.4m Bh 4.7m Lmax 17.2m Bmax 4.8m This could mean the LWL as we Brits call it is 16.4m and the Beam at WL is 4.7. Max length - deck level 17.2 - max width at widest point is 4.8m On 21 Mar 2014, at 17:03, sailormon <kimberlite@...> wrote:
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Dishwasher Amel 54
Krasopoulos Dimitris <dkra@...>
Thank you I will check and try to solve the problem it seems that this is the source of the problem Regards Dimitris Amel 54 Alma libre too Στάλθηκε από το iPhone μου 21 Μαρ 2014, 17:56, ο/η Nefeli <smnefeli@...> έγραψε:
Στάλθηκε από το iPhone μου
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Amel 54 and 55 measurements
sailormon <kimberlite@...>
Hi, What is the length at the waterline of the Amel 54 and 55 and its beam? Fair Winds Eric Kimberlite SM 376
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Re: [Amel Yacht Owners] Dometic Dishwasher DW2440- Amel54
smnefeli
I do not know if the model is the same, but I had exactly the same symptoms on my SuperMaramu.
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There is a security switch to prevent the dishwasher to flood the vessel that forces the evacuation pump to work (the noise you hear) but prevents anything else to happen. Try and check is under the dishwasher there is a recess with water accumulated (I had to extract the dishwasher on my vessel to check it, but it was not difficult). If so, get rid of the water and the problem is solved. Fernanmdo s/y Nefeli SM 38, currently in St. Lucia On 20 Mar 2014, at 23:34, Dimitris Krassopoulos wrote:
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Re: [Amel Yacht Owners] Range of AIS
svperegrinus <no_reply@...>
This does not address the original poster's question of what happens if you use a splitter, but here's some additional data:
1. VHF radio (with a 4' antenna on top of main mast) This radio has an AIS built-in. No antenna splitter, it uses the same antenna used for the voice radio. Currently the furthest reliable signal is "Dole Chile", steaming at 25.6 miles away. 2. Dedicated AIS on its on 4' antenna on top of mizzen This got a fragmentary tx from "Dole Chile", but lost that signal before it could receive the actual name (only got the MMSI), and never got ROT, nor draught, etc., although bearing, SOG and position were picked up. The furthest reliable signal is "Bimini Superfast", steaming at 23.9 miles away, a signal also picked by the VHF. Other than antenna height, a factor could be that even though both systems use 4' antennas, the VHF has a "Shakespeare Phase III Marine Cell" (mod. 6410) antenna, whereas the AIS has a "Shakesperare Phase III Marine AIS" (mod. 6396) antenna. But I doubt the antennas make much difference. Net/net, mast height makes a difference, as Mark proposes. There are 144 targets right now. s.v. Peregrinus SM2K #350 (2001) |
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Re: [Amel Yacht Owners] Range of AIS
sailormon <kimberlite@...>
Mark, It shouldn’t work at that range as you stated, but it does—I guess we are using the force ! Fair Winds Eric
From:
amelyachtowners@... [mailto:amelyachtowners@...] On
Behalf Of Mark Erdos
Eric,
I can’t explain the anomalies. I can just elucidate the theory.
Best regards,
Mark
SM2K #275
From:
amelyachtowners@... [mailto:amelyachtowners@...] On
Behalf Of sailormon
Mark, I have frequently received AIS from ships over 50 miles away. One time as I was rounding Montauk point I was able to read ships anchored outside Manhattan. Over 100 miles. I believe this is due to the fact that many of these ships AIS antennas are over 100 feet above the water.
With respect to the transmission of class B AIS , I believe it is only 5 watts as the class A is 25 watts. Many times I see ships but they only see me at about 5-6 miles. When I feel rich, I will buy a class A unit. Fair Winds Eric Kimberlite SM 376
From: amelyachtowners@...
[mailto:amelyachtowners@...]
On Behalf Of Mark Erdos
Sent: Thursday, March 20, 2014 10:09 AM To: amelyachtowners@... Subject: RE: [Amel Yacht Owners] ais antenna
Mark,
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Re: [Amel Yacht Owners] Range of AIS
Eric,
I can’t explain the anomalies. I can just elucidate the theory.
Best regards,
Mark
SM2K #275
From: amelyachtowners@... [mailto:amelyachtowners@...] On Behalf Of sailormon
Sent: Thursday, March 20, 2014 8:06 PM To: amelyachtowners@... Subject: [Amel Yacht Owners] Range of AIS
Mark, I have frequently received AIS from ships over 50 miles away. One time as I was rounding Montauk point I was able to read ships anchored outside Manhattan. Over 100 miles. I believe this is due to the fact that many of these ships AIS antennas are over 100 feet above the water.
With respect to the transmission of class B AIS , I believe it is only 5 watts as the class A is 25 watts. Many times I see ships but they only see me at about 5-6 miles. When I feel rich, I will buy a class A unit. Fair Winds Eric Kimberlite SM 376
From: amelyachtowners@... [mailto:amelyachtowners@...] On Behalf Of Mark Erdos
Mark, |
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