Showing posts with label are. Show all posts
Showing posts with label are. Show all posts
Thursday, November 24, 2016
No worries mate we are precisely in 176 2 feet of water
The owner of this boat called me and said his depth finder wasn't working correctly on a short "Shake Down" cruise from Sarasota, to Egmont Key and back. This was about a 70 mile trip up and back, and he said the Furuno depth finder acted weird on the whole trip. Since we were in about 10 feet of water, the Furuno RD30's depth of about 176 feet, did seem to be a wee bit on the high side. The Nobeltec sounder right next door does have the correct depth. Look at the picture closely, and above the depth number on the Nobeltec system, you can see the the wording "200 khz "Cruising."
So playing the game of "What's different between these two pictures?", we can now see the Furuno RD30 is reporting the correct depth, and the Nobeltec sounder is also. The difference is the Nobeltec sounder is now using the "50 khz Cruising" setting. So by now, a lot of boaters have figured what has happened, but for those who need some enlightenment, this is what is going on, in Americanized English.
The piezoceramic devices in the two transducers are pinging out sound waves, and listening to the returning sound waves as they echo back from the bottom. They are designed to send out a certain frequency sound wave, and hear that frequency when the sound wave bounces back from the bottom. In this case, since both transducers are using the same frequency, they are hearing each other, and the Furuno unit is getting confused. I suspect, but I'm not dead sure, that the Nobeltec sounder module, has a more powerful transducer (I did not climb into the engine room to verify this, it is what it is), and the lower power Furuno transducer just gets overwhelmed. In other words, the Nobeltec transducer is not adversely affected by the Furuno's transducer, but the Nobeltec's transducer bugs the heck out of the Furuno's transducer, if they are operating at the same frequency. Both transducers are made by Airmar, and I hope I got this dialog generally correct Ms. Robb.
The owner now knows, that if both sounder systems are operating at the same time, they must be set to different frequencies, if you don't want to be in 176.2 feet of water all of the time. There are transducer technologies, that can overcome this issue available, and the link below to Airmar will provide wealth of transducer information.
Airmar's FAQ page will answer about 99.1% of your transducer questions.
Saturday, September 17, 2016
Here are 9 steps in how to fit your curtain pole with in depth analysis
1. Pull the measuring tape out and measure the window. When measuring the window, put the tape in the middle of the window and then measure from the outside of the window frame to the outside of the other side of the frame. Write this number down on a piece of paper.
2. Add extra length to the window measurement to draw the curtains to the side. For example, add an extra six inches on each side. Always add the same amount on both sides to keep the curtain pole balanced. In general, a minimum of six inches is necessary to provide enough space on the side to clear the curtain from the window when it is pulled to the side.
3. Add the measurements together. For example, if you allow six inches on each side and the window measurement including the frame was 30 inches, the pole size you require is 42 inches long.
4. Pick out a curtain pole from the store and bring it home. As long as the pole is the appropriate measurement or adjusts to the appropriate measurement, it is appropriate for the curtain.
5. Prepare the curtain rod and bracket so all the pieces are together. Pick up the pole and then hold it up against the wall so it is above the window. Determine the height you prefer for the curtain pole placement.
6. Use a carpenter's level to determine if the curtain pole is straight. This will require the help of a friend or family member so one person can hold the pole while the other levels it. The person who levels the pole should use a pencil to mark bracket locations as needed for the pole. Most poles use two brackets. Put the pole down after marking it.
7. Drill small pilot holes in the wall at the marked locations for the brackets. Use a drill attachment that is smaller than the screws provided with the curtain.
8. Screw in the brackets into the wall at the pilot holes. Make sure all the screws are tight so the curtain pole does not fall.
9. Attach the pole to the bracket according to the pole instructions carefully. Usually, the pole slides onto the bracket, though every brand and pole is slightly different. The instructions provided with the pole should determine how the pole fits the bracket.
10. Browse a full range of curtain poles at the poles company, a leading UK curtain poles retailer.
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