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Speaking of NMEA, is there a NMEA alarm monitor?
Almost all GPSs have anchor watch alarms and radars have range alarms but
they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
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"Glenn Ashmore" wrote in message
news:zJ6Xd.54333$SF.21876@lakeread08... Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? Mmmm, interesting option :-) I know that the Seatalk-NMEA brigde from Raymarine has a dedicated alarm output. But this one only works on Seatalk alarms. A microcontroller-and-electronics hobbyist could make this for a few bucks though... Meindert |
Glenn Ashmore wrote:
Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com Yes, it's called a laptop, and you can connect MASSIVE speakers to it! Dennis. -- Satellite photocharts of the UK & Ireland available, excellent detail and accurate calibration using Oziexplorer. Remove *nospam* to reply. |
"Dennis Pogson" wrote in message ... Glenn Ashmore wrote: Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? Yes, it's called a laptop, and you can connect MASSIVE speakers to it! Some how keeping a laptop running 24 hours a day for 3 or 4 days just to monitor for alarm sentences when the job could be done with a fairly simple circuit drawing only a few milliwatts seems more than a little bit wastefull. Also the laptop may be subject to the idiosyncrasies of Windoze. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
Glenn Ashmore wrote:
"Dennis Pogson" wrote in message ... Glenn Ashmore wrote: Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? Yes, it's called a laptop, and you can connect MASSIVE speakers to it! Some how keeping a laptop running 24 hours a day for 3 or 4 days just to monitor for alarm sentences when the job could be done with a fairly simple circuit drawing only a few milliwatts seems more than a little bit wastefull. Also the laptop may be subject to the idiosyncrasies of Windoze. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com I'm sure you are right, but picking up a GPS circuit is more than my limited knowledge of electronics can manage, and as my laptop is connected to the gps most of the time, it seems an easy shortcut. Dennis. -- Satellite photocharts of the UK & Ireland available, excellent detail and accurate calibration using Oziexplorer. Remove *nospam* to reply. |
Meindert Sprang wrote:
"Glenn Ashmore" wrote in message news:zJ6Xd.54333$SF.21876@lakeread08... Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? Mmmm, interesting option :-) I know that the Seatalk-NMEA brigde from Raymarine has a dedicated alarm output. But this one only works on Seatalk alarms. A microcontroller-and-electronics hobbyist could make this for a few bucks though... Meindert Well then Meindert, it sounds like an interesting addition to add to, let's say, a NMEA multiplexer. You could programmatically tell it to convert one of the NMEA outputs to an alarm, coupled to a relay if the current needs to be very big. Another idea would be to offer an option to switch this into the external VHF speaker. Yes you're right a hobbyist can do this for a few bucks but the market is there for grabs, most people prefer buying something of the shelf! Come on, why don't you add this to the next software release ;-) -- Kees |
"Kees Verruijt" wrote in message
... Well then Meindert, it sounds like an interesting addition to add to, let's say, a NMEA multiplexer. You could programmatically tell it to convert one of the NMEA outputs to an alarm, coupled to a relay if the current needs to be very big. Another idea would be to offer an option to switch this into the external VHF speaker. Yes you're right a hobbyist can do this for a few bucks but the market is there for grabs, most people prefer buying something of the shelf! Come on, why don't you add this to the next software release ;-) I'm seriously thinking about it. But the only output available to do this, is the one that is used most to connect to an autopilot. Meindert |
On Mon, 7 Mar 2005 19:54:56 -0500, "Glenn Ashmore" wrote:
Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? As Meindert points out, it'd be pretty simple with a microcontroller. The most complicated part would be the user interface to set what to alarm on, and the criteria, and even that isn't a big deal. Heck, I'm retired and looking for a project...maybe I'll take a shot at it. Norm B |
On 2005-03-08 23:20:00 +1100, "Glenn Ashmore" said:
"Dennis Pogson" wrote in message ... Glenn Ashmore wrote: Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? Yes, it's called a laptop, and you can connect MASSIVE speakers to it! Some how keeping a laptop running 24 hours a day for 3 or 4 days just to monitor for alarm sentences when the job could be done with a fairly simple circuit drawing only a few milliwatts seems more than a little bit wastefull. Also the laptop may be subject to the idiosyncrasies of Windoze. Glen, Here is a scarry thought. My wife went in for LASIK surgery to her eyes. Basically it a laser procedure where they correct your eyes for astigmatism. They use a laser interferometer to map the surface of your eyball and them use mathematics to work out the sequence of laser blasts to ablate the eyball surface to generate good vision. The gave her a DVD of the process they did on her eyes and guess what? The whole thing is controlled by a Windoze PC. I wonder what would happen if the blue screen of death came up in the middle of a procedure;-) -- Regards, John Proctor VK3JP, VKV6789 S/V Chagall |
"John Proctor" wrote in message news:2005030907232116807%lost@nowhereorg... Here is a scarry thought. My wife went in for LASIK surgery to her eyes. Basically it a laser procedure where they correct your eyes for astigmatism. They use a laser interferometer to map the surface of your eyball and them use mathematics to work out the sequence of laser blasts to ablate the eyball surface to generate good vision. The gave her a DVD of the process they did on her eyes and guess what? The whole thing is controlled by a Windoze PC. I wonder what would happen if the blue screen of death came up in the middle of a procedure;-) I noticed to that when I got my eyeballs spot welded. But I had a couple of Valums working so just bowed towards Redmond, WA and crossed my fingers. :-) -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
"Glenn Ashmore" wrote in message news:zJ6Xd.54333$SF.21876@lakeread08... Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com Hi, Talking about "decent" multiplexers, all our NMEA multiplexers have "automatic GPS back-up switching" (plus many other NMEA sentence management features). Read about it he http://brookhouseonline.com/gps_backup_switching.htm . I have been playing with the idea to add a buzzer to warn the user when it switches to the backup GPS. As the "no GPS data" detection is already present, this is very simple to do. If there is sufficient interest, we'll include it as a standard feature. If you want it NOW, we'll add a buzzer to the present model for a small charge if you decide to buy one. Wout |
"Glenn Ashmore" wrote in message news:zJ6Xd.54333$SF.21876@lakeread08... Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com Hi, Talking about "decent" multiplexers, all our NMEA multiplexers have "automatic GPS back-up switching" (plus many other NMEA sentence management features). Read about it he http://brookhouseonline.com/gps_backup_switching.htm . I have been playing with the idea to add a buzzer to warn the user when it switches to the backup GPS. As the "no GPS data" detection is already present, this is very simple to do. If there is sufficient interest, we'll include it as a standard feature. If you want it NOW, we'll add a buzzer to the present model for a small charge if you decide to buy one. Wout Brookhouse |
"Wout B" wrote in message ... Hi, Talking about "decent" multiplexers, all our NMEA multiplexers have "automatic GPS back-up switching" (plus many other NMEA sentence management features). Read about it he http://brookhouseonline.com/gps_backup_switching.htm . I have been playing with the idea to add a buzzer to warn the user when it switches to the backup GPS. As the "no GPS data" detection is already present, this is very simple to do. If there is sufficient interest, we'll include it as a standard feature. If you want it NOW, we'll add a buzzer to the present model for a small charge if you decide to buy one. Wout Brookhouse "Now" is a relative term. I have been working on this boat for 6 years and am now in the "deep pockets" major boat bucks phase. It will be a year before I could afford to buy one if you made it. :-). -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
On Wed, 9 Mar 2005 11:59:17 +1300, "Wout B" wrote:
"Glenn Ashmore" wrote in message news:zJ6Xd.54333$SF.21876@lakeread08... Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com Hi, Talking about "decent" multiplexers, all our NMEA multiplexers have "automatic GPS back-up switching" (plus many other NMEA sentence management features). Read about it he http://brookhouseonline.com/gps_backup_switching.htm . I have been playing with the idea to add a buzzer to warn the user when it switches to the backup GPS. As the "no GPS data" detection is already present, this is very simple to do. If there is sufficient interest, we'll include it as a standard feature. If you want it NOW, we'll add a buzzer to the present model for a small charge if you decide to buy one. Wout I think there's an important point being missed here, IMHO. So far we have over-temp alarms, high water in the bilge alarms, NEMA-driven device alerts, CO alarms, smoke alarms, low oil pressure, and you can add to the list. What's really needed is a thing called an announciator (sp) panel, That's a 'thing' that tells you instantly what the alarm is, usually with a big display (1 inch by 4 inch), and an audible 'sounder'. Agree? Disagree? Norm B |
"Glenn Ashmore" wrote in message news:QnpXd.56586$SF.18771@lakeread08... "John Proctor" wrote in message news:2005030907232116807%lost@nowhereorg... Here is a scarry thought. My wife went in for LASIK surgery to her eyes. Basically it a laser procedure where they correct your eyes for astigmatism. They use a laser interferometer to map the surface of your eyball and them use mathematics to work out the sequence of laser blasts to ablate the eyball surface to generate good vision. The gave her a DVD of the process they did on her eyes and guess what? The whole thing is controlled by a Windoze PC. I wonder what would happen if the blue screen of death came up in the middle of a procedure;-) I noticed to that when I got my eyeballs spot welded. But I had a couple of Valums working so just bowed towards Redmond, WA and crossed my fingers. :-) I've been running my laptop almost 24/7 for about a year and a half and it has yet to crash. I hope the eye doctor was running XP. Doug -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
On Tue, 8 Mar 2005 21:24:05 -0500, "Glenn Ashmore"
wrote: I have been working on this boat for 6 years and am now in the "deep pockets" major boat bucks phase. It will be a year before I could afford to buy one if you made it. :-). ========================== Sheesh, even with all of those anchors I've bought? :-) |
"engsol" wrote in message ... On Wed, 9 Mar 2005 11:59:17 +1300, "Wout B" wrote: "Glenn Ashmore" wrote in message news:zJ6Xd.54333$SF.21876@lakeread08... Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com Hi, Talking about "decent" multiplexers, all our NMEA multiplexers have "automatic GPS back-up switching" (plus many other NMEA sentence management features). Read about it he http://brookhouseonline.com/gps_backup_switching.htm . I have been playing with the idea to add a buzzer to warn the user when it switches to the backup GPS. As the "no GPS data" detection is already present, this is very simple to do. If there is sufficient interest, we'll include it as a standard feature. If you want it NOW, we'll add a buzzer to the present model for a small charge if you decide to buy one. Wout I think there's an important point being missed here, IMHO. So far we have over-temp alarms, high water in the bilge alarms, NEMA-driven device alerts, CO alarms, smoke alarms, low oil pressure, and you can add to the list. What's really needed is a thing called an announciator (sp) panel, That's a 'thing' that tells you instantly what the alarm is, usually with a big display (1 inch by 4 inch), and an audible 'sounder'. Agree? Disagree? Norm B Sounds like a good idea, I'm sure it would be well received. Wout |
John Proctor wrote:
On 2005-03-08 23:20:00 +1100, "Glenn Ashmore" said: "Dennis Pogson" wrote in message ... Glenn Ashmore wrote: Almost all GPSs have anchor watch alarms and radars have range alarms but they all put out a whimpy little beep. Is there a device that monitors the NMEA data streams (from say a multiplexer) and make a noise that will get your attention when it sees an alarm or MOB statement?? Yes, it's called a laptop, and you can connect MASSIVE speakers to it! Some how keeping a laptop running 24 hours a day for 3 or 4 days just to monitor for alarm sentences when the job could be done with a fairly simple circuit drawing only a few milliwatts seems more than a little bit wastefull. Also the laptop may be subject to the idiosyncrasies of Windoze. Glen, Here is a scarry thought. My wife went in for LASIK surgery to her eyes. Basically it a laser procedure where they correct your eyes for astigmatism. They use a laser interferometer to map the surface of your eyball and them use mathematics to work out the sequence of laser blasts to ablate the eyball surface to generate good vision. The gave her a DVD of the process they did on her eyes and guess what? The whole thing is controlled by a Windoze PC. I wonder what would happen if the blue screen of death came up in the middle of a procedure;-) -- Regards, John Proctor VK3JP, VKV6789 S/V Chagall Press cntrl-alt-del for new eyeballs? -- Satellite photocharts of the UK & Ireland available, excellent detail and accurate calibration using Oziexplorer. Remove *nospam* to reply. |
Hi, Talking about "decent" multiplexers, all our NMEA multiplexers have "automatic GPS back-up switching" (plus many other NMEA sentence management features). Read about it he http://brookhouseonline.com/gps_backup_switching.htm . I have been playing with the idea to add a buzzer to warn the user when it switches to the backup GPS. As the "no GPS data" detection is already present, this is very simple to do. If there is sufficient interest, we'll include it as a standard feature. If you want it NOW, we'll add a buzzer to the present model for a small charge if you decide to buy one. Wout Ehh, talking about "Decent" multiplexers: decent multiplexers have isolated inputs, yours don't. I just connected one of yours to a differential NMEA talker output. I can now hear all NMEA data on my SSB!! While trying to find out what's wrong, I found that all inputs on your multiplexer have the B terminals connected to ground!!! NMEA inputs are supposed to be isolated. Your grounded B terminals on the inputs effectively short-circuit any properly designed talker. Was it that hard to add 50 cents worth of optocouplers? Gert |
"Gert Been" wrote in message ... Hi, Talking about "decent" multiplexers, all our NMEA multiplexers have "automatic GPS back-up switching" (plus many other NMEA sentence management features). Read about it he http://brookhouseonline.com/gps_backup_switching.htm . I have been playing with the idea to add a buzzer to warn the user when it switches to the backup GPS. As the "no GPS data" detection is already present, this is very simple to do. If there is sufficient interest, we'll include it as a standard feature. If you want it NOW, we'll add a buzzer to the present model for a small charge if you decide to buy one. Wout Ehh, talking about "Decent" multiplexers: decent multiplexers have isolated inputs, yours don't. I just connected one of yours to a differential NMEA talker output. I can now hear all NMEA data on my SSB!! While trying to find out what's wrong, I found that all inputs on your multiplexer have the B terminals connected to ground!!! NMEA inputs are supposed to be isolated. Your grounded B terminals on the inputs effectively short-circuit any properly designed talker. Was it that hard to add 50 cents worth of optocouplers? Gert Our new multiplexers have opto-isolated inputs and are compliant with CE emission requirements. Strange that I first hear from you via this newsgroup. Would you not have contacted us with your complaint if you had not come across this newsgroup thread? You say you have just installed one of our multiplexers. I have checked our records, but we don't have you listed as a recent direct customer. If you have any kind of problem with a multiplexer, we'll be happy to assist if you contact us via the normal channel. Your problem can be easily resolved. All you need to do is send us an email and let us know where and when you bought your multiplexer. Wout |
"Meindert Sprang" wrote in
: Mmmm, interesting option :-) I know that the Seatalk-NMEA brigde from Raymarine has a dedicated alarm output. But this one only works on Seatalk alarms. A microcontroller-and-electronics hobbyist could make this for a few bucks though... Meindert I feel a whole new product coming online......(c; MAKE THE DAMNED ALARM LOUD ENOUGH TO WAKE EVERYONE ABOARD!! Thanks....(c; You can hardly hear a Raymarine RL70CRC alarm sitting right in front of it in a 10 knot wind....stupid, stupid, STUPID! |
"Gert Been" wrote in
: Ehh, talking about "Decent" multiplexers: decent multiplexers have isolated inputs, yours don't. I just connected one of yours to a differential NMEA talker output. I can now hear all NMEA data on my SSB!! While trying to find out what's wrong, I found that all inputs on your multiplexer have the B terminals connected to ground!!! NMEA inputs are supposed to be isolated. Your grounded B terminals on the inputs effectively short-circuit any properly designed talker. Was it that hard to add 50 cents worth of optocouplers? Gert This is one of my pet peeves with most manufacturers. STupid Icom's really expensive M-802 uses a BNC RF connector that only has ONE WIRE and ground to hook the NMEA data to the transceiver for DSC/GMDSS GPS input. They should all be HUNG! If everything had a balanced line like NMEA was designed for, I could probably transmit on HF without tearing up the whole boat's NMEA network....(d^:) |
"Wout B" wrote in
: Our new multiplexers have opto-isolated inputs and are compliant with CE emission requirements. Strange that I first hear from you via this newsgroup. Would you not have contacted us with your complaint if you had not come across this newsgroup thread? You say you have just installed one of our multiplexers. I have checked our records, but we don't have you listed as a recent direct customer. If you have any kind of problem with a multiplexer, we'll be happy to assist if you contact us via the normal channel. Your problem can be easily resolved. All you need to do is send us an email and let us know where and when you bought your multiplexer. Wout Translation - "Shhhh.....don't say bad things about boat products in public forums like newsgroups"....... |
"Wout B" wrote in
: Hi, Talking about "decent" multiplexers, all our NMEA multiplexers have "automatic GPS back-up switching" (plus many other NMEA sentence management features). Read about it he http://brookhouseonline.com/gps_backup_switching.htm . I have been playing with the idea to add a buzzer to warn the user when it switches to the backup GPS. As the "no GPS data" detection is already present, this is very simple to do. If there is sufficient interest, we'll include it as a standard feature. If you want it NOW, we'll add a buzzer to the present model for a small charge if you decide to buy one. Wout Brookhouse I'd rather see shielded connectors so I can run shielded pair cables and RF bypassing of all inputs to keep the HF SSB from screwing all the NMEA crap attached to it. Shielding everything would also make it so we could HEAR the HF receiver and get our WEFAXes without the constant drone of NMEA radiated interference from all the unshielded, unbalanced connections with just open wires sticking out of things. NMEA needs to get its act together and enforce some standards on its members.... Of course, we could dump all this proprietary crap and just wire the boat for Ethernet, negating the need for multiplexers in 1970 serial connections. Ahhhh....addressable Ethernet instruments all speaking the SAME language through a good $49 wireless Netgear router to the wireless laptop in my berth....(c; |
Larry,
Do you have ferite beads at both ends of all your NMEA cables? If so, do they help? krj Larry W4CSC wrote: "Wout B" wrote in : Hi, Talking about "decent" multiplexers, all our NMEA multiplexers have "automatic GPS back-up switching" (plus many other NMEA sentence management features). Read about it he http://brookhouseonline.com/gps_backup_switching.htm . I have been playing with the idea to add a buzzer to warn the user when it switches to the backup GPS. As the "no GPS data" detection is already present, this is very simple to do. If there is sufficient interest, we'll include it as a standard feature. If you want it NOW, we'll add a buzzer to the present model for a small charge if you decide to buy one. Wout Brookhouse I'd rather see shielded connectors so I can run shielded pair cables and RF bypassing of all inputs to keep the HF SSB from screwing all the NMEA crap attached to it. Shielding everything would also make it so we could HEAR the HF receiver and get our WEFAXes without the constant drone of NMEA radiated interference from all the unshielded, unbalanced connections with just open wires sticking out of things. NMEA needs to get its act together and enforce some standards on its members.... Of course, we could dump all this proprietary crap and just wire the boat for Ethernet, negating the need for multiplexers in 1970 serial connections. Ahhhh....addressable Ethernet instruments all speaking the SAME language through a good $49 wireless Netgear router to the wireless laptop in my berth....(c; |
"Gert Been" wrote in message
... Ehh, talking about "Decent" multiplexers: decent multiplexers have isolated inputs, yours don't. I just connected one of yours to a differential NMEA talker output. I can now hear all NMEA data on my SSB!! While trying to find out what's wrong, I found that all inputs on your multiplexer have the B terminals connected to ground!!! NMEA inputs are supposed to be isolated. Your grounded B terminals on the inputs effectively short-circuit any properly designed talker. Was it that hard to add 50 cents worth of optocouplers? Ouch!!! Meindert |
"Larry W4CSC" wrote in message
... This is one of my pet peeves with most manufacturers. STupid Icom's really expensive M-802 uses a BNC RF connector that only has ONE WIRE and ground to hook the NMEA data to the transceiver for DSC/GMDSS GPS input. They should all be HUNG! If everything had a balanced line like NMEA was designed for, I could probably transmit on HF without tearing up the whole boat's NMEA network....(d^:) I agree completely. NMEA should have simply revoked membership of anyone not adhering to the standard. The NMEA-0183 spec is very clear on the naming of the terminals, what signals they should carry and the required isolation on every input. So if everyone adhered to the standard, connecting NMEA would have been as easy as connecting a ligthbulb..... Meindert |
"Larry W4CSC" wrote in message
... I'd rather see shielded connectors so I can run shielded pair cables and RF bypassing of all inputs to keep the HF SSB from screwing all the NMEA crap attached to it. Shielding everything would also make it so we could HEAR the HF receiver and get our WEFAXes without the constant drone of NMEA radiated interference from all the unshielded, unbalanced connections with just open wires sticking out of things. NMEA needs to get its act together and enforce some standards on its members.... Funny thing is: you don't need shielded connectors to be HF-quiet. The physical size of two screw terminals and an inch of bare wire ends are simply not enough to be able to radiate sufficient RF. What does radiate on HF are long cable runs that are either unshielded or unbalanced. Raymarine have put our multiplexers to the test to comply with IEC945 for instance, which limits for susceptibility and emission are rougly ten times more stringent than FCC Part 15 class B. And it passed that test while being in a plastic box and having screw-terminals. The really important thing is to have it wired correctly and, most important, not to connect a shield *at both ends*. Meindert |
"krj" wrote in message
. .. Larry, Do you have ferite beads at both ends of all your NMEA cables? If so, do they help? Ferrite beads don't do much on HF, but all the more on VHF. But like I said in me other replay, it's more important to terminate the wire correctly. If you have a shield, do not use it as a signal return as with coaxial cable. Only connect it on one side so no current can flow through the shield, otherwise it will radiate being a perfect antenna. Meindert |
Meindert,
The problem is that all the Raymarine Seatalk cables use red for yellow for data, red for + volts, and the shield for - volts. Saves cost of s third wire. krj Meindert Sprang wrote: "krj" wrote in message . .. Larry, Do you have ferite beads at both ends of all your NMEA cables? If so, do they help? Ferrite beads don't do much on HF, but all the more on VHF. But like I said in me other replay, it's more important to terminate the wire correctly. If you have a shield, do not use it as a signal return as with coaxial cable. Only connect it on one side so no current can flow through the shield, otherwise it will radiate being a perfect antenna. Meindert |
"krj" wrote in message
.. . Meindert, The problem is that all the Raymarine Seatalk cables use red for yellow for data, red for + volts, and the shield for - volts. Saves cost of s third wire. krj I see. What you *can* do against HF interference is to run each cable 10 loops through a ferrite ring core. Meindert |
"Doug Dotson" dougdotson@NOSPAMcablespeedNOSPAMcom wrote in message ... "Glenn Ashmore" wrote in message news:QnpXd.56586$SF.18771@lakeread08... "John Proctor" wrote in message news:2005030907232116807%lost@nowhereorg... Here is a scarry thought. My wife went in for LASIK surgery to her eyes. Basically it a laser procedure where they correct your eyes for astigmatism. They use a laser interferometer to map the surface of your eyball and them use mathematics to work out the sequence of laser blasts to ablate the eyball surface to generate good vision. The gave her a DVD of the process they did on her eyes and guess what? The whole thing is controlled by a Windoze PC. I wonder what would happen if the blue screen of death came up in the middle of a procedure;-) I noticed to that when I got my eyeballs spot welded. But I had a couple of Valums working so just bowed towards Redmond, WA and crossed my fingers. :-) I've been running my laptop almost 24/7 for about a year and a half and it has yet to crash. I hope the eye doctor was running XP. Doug -- Glenn Ashmore I worked for about a year (4 years ago) as a test technician at an OEM company that made embedded microprocessor products for several medical electronics firms for eye surgery. Quite often the boards we tested were small quantities and we usually had no clue what some of the connectors interfaced with once we sent them to our customer. However, silk screen labels such as foot pedal left, right, forward, back, up, down, etc raised my curiosity. It seems the eye surgeons use a foot pedal control similar to the clamp on skates we played with as children. Yes, the processors and firmware used Intel products, so I am not surprised there is a Windows XXX interface, but I doubt if Windows was directly controlling the surgery. I suspect it was used for logging and visual magnification, etc. The OEM boards appeared to be the surgeon interface to the laser and fluid washers, etc. 73 Doug K7ABX |
"Meindert Sprang" wrote in
: So if everyone adhered to the standard, connecting NMEA would have been as easy as connecting a ligthbulb..... Meindert An all multiplexers should use STANDARDIZED SHIELDED CONNECTORS, not some open screw terminals just waiting for something to touch them.......grrrr.....(c; |
krj wrote in
: Larry, Do you have ferite beads at both ends of all your NMEA cables? If so, do they help? krj I tried that, too. They reduce the noise, somewhat, but the open screw terminals on the Noland multiplexer, the unbalanced lines making all the unshielded NMEA cables into a giant transmitting antenna just bypass them beads or clamshell ferrites so much it's nearly useless..... I bought a new Maxtor 300 GB external portable hard drive for my system, today, in a moment of weakness at Best Buy ($299). It came with the nicest WELL SHIELDED USB-2 and Firewire cables with clear plastic coverings so you can see the braided shield inside....oh, the longing for a whole boat network like that...(c; |
"Larry W4CSC" wrote in message
... "Meindert Sprang" wrote in : So if everyone adhered to the standard, connecting NMEA would have been as easy as connecting a ligthbulb..... Meindert An all multiplexers should use STANDARDIZED SHIELDED CONNECTORS, not some open screw terminals just waiting for something to touch them.......grrrr.....(c; Yeah Yeah..... When you are installing this stuff for living, you very soon learn to appreciate the absence of fixed connectors on cables..... or do you want to make all holes in bulkeads bug enough for all connectors to push through..... just once..... Meindert |
On Mon, 14 Mar 2005 07:02:18 +0100, "Meindert Sprang" wrote:
"Larry W4CSC" wrote in message ... "Meindert Sprang" wrote in : So if everyone adhered to the standard, connecting NMEA would have been as easy as connecting a ligthbulb..... Meindert An all multiplexers should use STANDARDIZED SHIELDED CONNECTORS, not some open screw terminals just waiting for something to touch them.......grrrr.....(c; Yeah Yeah..... When you are installing this stuff for living, you very soon learn to appreciate the absence of fixed connectors on cables..... or do you want to make all holes in bulkeads bug enough for all connectors to push through..... just once..... Meindert Am I over looking something? Can't the cable be routed, then the connectors installed? Might make a neater installation, avoiding coils of excess cable....or cables which might be too short. Norm B |
"engsol" wrote in message
... On Mon, 14 Mar 2005 07:02:18 +0100, "Meindert Sprang" wrote: When you are installing this stuff for living, you very soon learn to appreciate the absence of fixed connectors on cables..... or do you want to make all holes in bulkeads bug enough for all connectors to push through..... just once..... Meindert Am I over looking something? Can't the cable be routed, then the connectors installed? Might make a neater installation, avoiding coils of excess cable....or cables which might be too short. No, you're not overlooking. But it just feels plain stupid to first cut the plugs, route the cables and then reassemble them. What would you like to do most: solder a plug with tiny contacts or just strip the wire, crimp on a pin and screw them into a screw terminal? And believe me, it's not just theory but this is backed up with measurements: a 4800 baud signal is just not going to produce interference because the last inch is not screened and connected to screw terminals. They are physically too small to be able to radiate enough energy to interfere with an SSB. Meindert |
Have you priced a crimping machine that is capable of dealing with most
reasonable moisture proof connectors? Doug "engsol" wrote in message ... On Mon, 14 Mar 2005 07:02:18 +0100, "Meindert Sprang" wrote: "Larry W4CSC" wrote in message ... "Meindert Sprang" wrote in : So if everyone adhered to the standard, connecting NMEA would have been as easy as connecting a ligthbulb..... Meindert An all multiplexers should use STANDARDIZED SHIELDED CONNECTORS, not some open screw terminals just waiting for something to touch them.......grrrr.....(c; Yeah Yeah..... When you are installing this stuff for living, you very soon learn to appreciate the absence of fixed connectors on cables..... or do you want to make all holes in bulkeads bug enough for all connectors to push through..... just once..... Meindert Am I over looking something? Can't the cable be routed, then the connectors installed? Might make a neater installation, avoiding coils of excess cable....or cables which might be too short. Norm B |
On Mon, 14 Mar 2005 19:25:40 +0100, "Meindert Sprang" wrote:
"engsol" wrote in message .. . On Mon, 14 Mar 2005 07:02:18 +0100, "Meindert Sprang" wrote: When you are installing this stuff for living, you very soon learn to appreciate the absence of fixed connectors on cables..... or do you want to make all holes in bulkeads bug enough for all connectors to push through..... just once..... Meindert Am I over looking something? Can't the cable be routed, then the connectors installed? Might make a neater installation, avoiding coils of excess cable....or cables which might be too short. No, you're not overlooking. But it just feels plain stupid to first cut the plugs, route the cables and then reassemble them. What would you like to do most: solder a plug with tiny contacts or just strip the wire, crimp on a pin and screw them into a screw terminal? And believe me, it's not just theory but this is backed up with measurements: a 4800 baud signal is just not going to produce interference because the last inch is not screened and connected to screw terminals. They are physically too small to be able to radiate enough energy to interfere with an SSB. Meindert Yep, soldering tiny pins is no fun. I agree 100% that 'strip n crimp' is the way to go. When I was doing embedded controllers for ag equipment, I used 3M plastic circular mating connectors. They had the advantage of strain relief and some protection from dust and moisture, to say nothing of accidential shorting. As to 4800 baud radiating for 1 inch unshielded...not much chance of that. The only exception might be if the rise time of the pulses was quick enough...often seen in switching power supplies....to cause the old 'comb' of harmonics. Norm B |
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