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#391
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Why don't voice radio communications use FM?
Stefan,
(Nitpicking, but what else would you expect in r.a.p.) Have you read this thread? The one big smart*ss in it is more than enough, thank you very much. No need to add to it. -- Thomas Borchert (EDDH) |
#392
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Why don't voice radio communications use FM?
Thomas Borchert wrote:
Emily, Did he really just point this out like no instrment pilot knows this? Still here? ;-) I know, Iknow, I should just kill the entire thread. |
#393
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Why don't voice radio communications use FM?
On Tue, 12 Sep 2006 12:48:35 +0200, Mxsmanic
wrote: Thomas Borchert writes: Yes. So? So the compass cannot always be trusted. The *only* time a compass can almost be trusted is in straight, level, and un-accelerated flight. We make turns based on the TC and a watch not the compass. OTOH you don't have to worry about it precessing like the DG. I can roll into a CW turn and watch the compass show a CCW turn. I can accelerate on one direction and it'll show a left turn. Accelerate in a different direction and have it show a right turn. Of course decelerating will show turns opposite of accelerating. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
#394
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Why don't voice radio communications use FM?
Roger (K8RI) wrote:
On Tue, 12 Sep 2006 12:48:35 +0200, Mxsmanic wrote: Thomas Borchert writes: Yes. So? So the compass cannot always be trusted. The *only* time a compass can almost be trusted is in straight, level, and un-accelerated flight. But the errors are predictable. I've seen a DG slowly wind down to nothing and then completely fail, and I flew the plane just fine with just the compass. |
#395
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Why don't voice radio communications use FM?
Roger (K8RI) wrote:
On Tue, 12 Sep 2006 12:48:35 +0200, Mxsmanic wrote: Thomas Borchert writes: Yes. So? So the compass cannot always be trusted. The *only* time a compass can almost be trusted is in straight, level, and un-accelerated flight. We make turns based on the TC and a watch not the compass. OTOH you don't have to worry about it precessing like the DG. I can roll into a CW turn and watch the compass show a CCW turn. I can accelerate on one direction and it'll show a left turn. Accelerate in a different direction and have it show a right turn. Of course decelerating will show turns opposite of accelerating. It is still trustworthey as it does the same thing in the same conditions every time. That is most people's definition of something you can trust. The acceleration and turn errors are known and predictable, what is there not to trust? The only thing that makes a compass not trustworthey is an unknown magnetic field that may have been brought into the airplane. If you didn't learn to understand and compensate for the characteristics of the standard aviation compass during your flight training, then it is your instruction that was not trustworthey! :-) Matt |
#396
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Why don't voice radio communications use FM?
On Wed, 13 Sep 2006 01:27:58 GMT, Matt Whiting
wrote in : The only thing that makes a compass not trustworthey is an unknown magnetic field that may have been brought into the airplane. Of course, there's also electromagnetism... |
#397
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Why don't voice radio communications use FM?
Larry Dighera wrote:
On Wed, 13 Sep 2006 01:27:58 GMT, Matt Whiting wrote in : The only thing that makes a compass not trustworthey is an unknown magnetic field that may have been brought into the airplane. Of course, there's also electromagnetism... I didn't specify the source of the magnetic field. :-) Matt |
#398
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Why don't voice radio communications use FM?
On Wed, 13 Sep 2006 05:01:18 GMT, Matt Whiting
wrote in : Larry Dighera wrote: On Wed, 13 Sep 2006 01:27:58 GMT, Matt Whiting wrote in : The only thing that makes a compass not trustworthey is an unknown magnetic field that may have been brought into the airplane. Of course, there's also electromagnetism... I didn't specify the source of the magnetic field. :-) No you didn't. I would think it possible for portable wiring plugged into a cigarette lighter to be a possible source of magnetism capable of affecting a compass. I suppose, if both wires are parallel and adjacent, their fields would cancel, but I wouldn't stake my life on it. |
#399
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Why don't voice radio communications use FM?
On Tue, 12 Sep 2006 20:13:57 -0500, Emily
wrote: Roger (K8RI) wrote: On Tue, 12 Sep 2006 12:48:35 +0200, Mxsmanic wrote: Thomas Borchert writes: Yes. So? So the compass cannot always be trusted. The *only* time a compass can almost be trusted is in straight, level, and un-accelerated flight. But the errors are predictable. I've seen a DG slowly wind down to nothing and then completely fail, and I flew the plane just fine with just the compass. I think I may have phrased that poorly. Let me try again? :-)) The compass tells you the truth "only" when in straight, level, and un-accelerated flight IF outside influences are taken into account. Those outside influences are normally predictable, but sometimes sneak up on the unwary. In addition to magnetic variation some aircraft develop some magnetic fields (portions of the airframe may become magnetized) and require degaussing. Adding new equipment can sometimes require "re-swinging" the compass. I have to be careful where I put the Garmin GPS. It works fine on the yoke, but will swing the compass about 60 degrees on when on the glare shield. Around here the magnetic compass is only 6 degrees off which is close enough. However there are areas in the lower 48 where I think you can find close to 20 degrees. Now that is enough to notice even on a short trip. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
#400
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Why don't voice radio communications use FM?
Unfortunately, prices have gone up, yet, this is often available for $59 (sometimes less). He can do this for $49 at many places. He dosen't need to be under the hood to manipulate the controls. www.beapilot.com Best regards, Jer/ "Flight instruction and mountain flying are my vocations!" -- Jer/ (Slash) Eberhard, Mountain Flying Aviation, LTD, Ft Collins, CO CELL 970 231-6325 EMAIL jeratfrii.com http://users.frii.com/jer/ C-206 N9513G, CFII Airplane&Glider FAA-DEN Aviation Safety Counselor CAP-CO Mission&Aircraft CheckPilot BM218 HAM N0FZD 240 Young Eagles! |
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