1. What is the average life span of a marine radar? 2. Where is the TR cell located? 3. How to test a marine Radar?

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Either a weak magnetron, water in wave guide or most likely radar settings are not right.
You have an 1834C, so a 4KW dome, right?
Radar antenna should be set to type "B" in Radar Set-Up menu
Access this menu by holding the Menu button during turn on and then choosing Installation Mode, allowing access to Installation Set Up Menu, where the Radar Set Up Menu is located. Be sure to do Optimize Radar, while you are in there.
Learn to use Sea Clutter and turn off AC Auto Tune.
Good Luck!
John 847-746-0100

go to the seller and ask him or her

Press and hold the "MENU" button during power on. Release "MENU" after boat appears.
Go through the installation wizard. You must select the radar type, "B" is 1834.

No it does not output any type of radar video data.

depending on which radar it is, it may be the video coax inside the radar cable. Otherwise possibly your magnetron or mic. Try calling mid-shore electronics @ 410-228-7335 they may be able to assist you.

depending on the type of boat you currently have it mounted on, you may be out of range. Also your radar may need tuning and make sure your rain and seaclutter is not too high. Make sure the rain clutter is off. If the radar is mounted on a sailboat and you're having this problem, it's most likely the height unless it worked before in which case it could either be the display or the radar components. Magnetrons which run the radar also have a life.

A 1942 is a 6 kw radar a 1720 is either a 1.5 or 2.2 kw dome. The two will not work together. Besides the cabling is different. Also the radar cable on a 1942 is round where as the 1720 is square. The 1942 display should work fine on a 1943 navnet radar.

You may have a faulty magnetron or one that has gotten old. They do have a life. Find out how many hours you have on the unit and give furuno a call. They will more than likely tell you what they think the problem is.

this sound like a timing issue that could be calibrated out. is it constant or bouncing around