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problem with simrad radar - or mount...
Hi Jack,
I currently run the radar in HU since I havnt installed my fluxgate yet. I can only agree, after reading your post, that the GPS shouldnt have anything to do with it. The antenna does not know the bearing to the reflection and thus throws the error message. Ill try to take apart the dome and check for cables, dirt etc. Any tips on how the bearing data in Simrads are generated would be greatly appriciated. Regards david Jack Erbes wrote: David Rinnan wrote: Hi Bruce, Thanks for all the information! Just to make sure I understand this.. When you say "look at the way the bearing data is generated" are you then refering to the GPS, in my case, since I havnt installed a separate compass yet? It is not about the GPS, he is talking about bearing as in the direction the radar's rotating radiator or antenna is pointed (relative to the center line of the boat). That bearing is the direction the radar pulse was sent to and received from. If that bearing display is off, the relative bearing to a radar contact from the boat would incorrect. Does your boat have a flux gate compass? A boat with a radar system and/or a autopilot really should have a flux gate compass for determining the boats bearing when not moving. A flux gate compass knows the bearing at all times (boat moving or not) and sends it to other devices as a NMEA sentence. If you do not have a flux gate compass your radar has probably been set up to use the heading data from the NMEA sentences from the GPS. GPS headings are only reliable when you are moving, they float around when you are stopped and do not stay relative to the bow of the boat. In the above I use heading and bearing as follows: heading - the direction the boat is moving bearing - the direction the bow of the boat is pointing Some people will want to argue about the terms and their use but I'm not likely to indulge in discussion about it. :) There are many different definitions and schools of thought on some navigation terms and none of them are wrong. Jack |
#2
posted to rec.boats.electronics
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problem with simrad radar - or mount...
David Rinnan wrote:
Hi Jack, I currently run the radar in HU since I havnt installed my fluxgate yet. I can only agree, after reading your post, that the GPS shouldnt have anything to do with it. The antenna does not know the bearing to the reflection and thus throws the error message. Ill try to take apart the dome and check for cables, dirt etc. Any tips on how the bearing data in Simrads are generated would be greatly appriciated. Checking inside the dome sounds like a good idea to me. I'd think that newer radars would have the timing pulse generator simplified down to something a little less troublesome than optic sensors and stuff like that though. I'm not a radar tech in any sense of the word, I am guy that has occasionally opened one up and checked or connected the cable or something simple like that. Jack -- Jack Erbes in Ellsworth, Maine, USA - jackerbes at adelphia dot net (also receiving email at jacker at midmaine.com) |
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