Question about Furuno Navnet 1834C/NT vx2 Radar C Map Nt

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No data at >1mile

Radar sweep visible on display. Detection good at 1 mile only "grass". Unit is brand new, recently installed.

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  • 65 Answers

If the unit is new and never been set up post installation, that's probably your problem. You have to go into the Installation Wizard and set the unit up properly. There are multiple choices of displays and scanner units to select to obtain the configuration you have. Then the radar has to be optimized (auto-tuned). If you don't have access to an installation manual and feel confident yourself, you'll need to contact a local Furuno authorized dealer or call Furuno USA tech support and they'll walk you through it. Their number is 360-834-9300

Posted on Jun 20, 2014

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Posted on Jan 02, 2017

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TechnoMarine
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SOURCE: Hi, Furuno 1731 radar - no sweep/echo seen on

Go to longest range and full Gain min Rain and Sea Clutter
Do you have speckle? Yes = Receive OK, Wiring OK,No transmit (magnetron or modulator) No = Most likely a broken wire
There is a very tiny coax (shielded wire) that is know to lose its' center conductor, which is very delicate

Posted on Jan 13, 2010

  • 111 Answers

SOURCE: No radar target images

Sounds like your video cable inside your radar cable. Also brings your Gain back to zero, STC back to Zero and rain back to zero. Next increase your gain until you see a picture. If none of that is working, check your cable then finally call a dealer.

Posted on Jan 22, 2010

  • 64 Answers

SOURCE: NMEA Output from Furuno 6" LCD Radar, Model 1623

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

Posted on Jun 14, 2010

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1 Answer

What is pop radar


When radar detectors proved easily capable of sniffing out radar from miles away, radar gun manufacturers responded by producing instant-on radar or unoffically called "Pulse" radar. In the instant-on mode, the radar's transmitter is placed on hold, ready to fire but not yet producing a signal for detectors to hear. The officer waits until his target is very close (brings a new meaning to "wait till you see the whites of their eyes") then releases the radar from stand by mode and gets a speed reading within a second or so (pulse). In this situation, no detector offers much warning.
There are guns out there that operate just like the instant-on guns of the past but with a very tough twist - POPTM mode! This gun is a normal K and Ka band radar gun detectable by most radar detectors made in the past 30 years, until this gun is placed in POP mode. When the gun is in POP™ Mode and activated, a brief burst of energy, less than 1/15 of a second, is transmitted and the vehicle's speed is quickly acquired. A detector without POP™ Mode detection capability cannot respond to this brief transmission.
TIP - When traveling in unfamiliar highways always try to find a vehicle which is traveling at the same rate or faster than you are and keep several car lengths behind them. This way the other vehicle can "flush out the radar".

Oct 22, 2015 | Vehicle Parts & Accessories

1 Answer

No data at >1 mile


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

Dec 26, 2013 | Furuno Navnet 1834C/NT vx2 Radar C Map Nt

1 Answer

We have a radar Furuno 1622 - the scanner scans but sometimes we got echo and targets, sometimes none, sometime we get echos and targets on a small range display (1mile) but none on 2 or 4 miles range,...


I know this question is very basic, but did you check your gain and clutter settings? That echoes show in short range, disappear, reappear, and are not consistent on long range sounds normal to me. Auto settings sometimes also can get a bit mad, then manula settings makes sense.

Did you run the unit and scanner test?

Dec 04, 2010 | Furuno 1715 LCD Radar System GPS Receiver

1 Answer

My ship furuno radar hasn no sweep only a center dot.all other fed in information like speed,GPS input o.k.


The symptom you describe sounds like a case of no radar targets. To further diagnose, put radar on the longest range and turn Gain to full, Sea Clutter to Minimum, Rain Clutter to Minimum, and observe the screen. The presence of "grass" or evenly distributed clutter indicates that the receiver and cabling is good and the radar may not be transmitting. No transmit is caused by a bad magnetron or a bad modulator in the antenna, or depending on model there is still an outside chance that the power supply in the display has failed.

Dec 29, 2009 | Furuno Navnet 1834C/NT vx2 Radar C Map Nt

1 Answer

No radar target images


Sounds like your video cable inside your radar cable. Also brings your Gain back to zero, STC back to Zero and rain back to zero. Next increase your gain until you see a picture. If none of that is working, check your cable then finally call a dealer.

Oct 15, 2009 | Furuno 1715 Radar 24nm Range

1 Answer

I recently purchased a used cobra 6050 radar detector, it passes self test but doesn't alert on anything. What should I do?


Unfortunatly most people don't get rid of a good working radar detector, check with the manufactor they usually have a mail in repair service but depending on what they're gonna charge you, you might be better off buying a new one - I have found Escort to be very good and I've had several brands.

Aug 18, 2009 | Vehicle Parts & Accessories

1 Answer

Garmin 660WT FM - Use in France re Speed Cameras


this is a gps navigation device. there is no radar detection with it. the only thing it has is an FM traffic service to avoid delays, which may not be available in france. in short, this device is not illeagel nor does it have any type or radar detection or even speed camera detection.

Jul 18, 2009 | Garmin Nuvi 660 GPS Receiver

1 Answer

Error message on screen "No heading pulse"


Your belt on the inside of the dome has come off. Take a small allen wrench with you when you go to check on it.

Mar 14, 2009 | Furuno 1715 7" Monochrome Lcd 2.2kw Radar...

1 Answer

Service required


This message is generated only after a Bel or Escort radar detector has repeatedly encountered problems while trying to self-calibrate its radar detection circuitry. The Service Required message literally means that you must send in your RD for service since there is nothing that can be done to fix whatever the problem is short of sending it in for factory service. At least it will come back working like brand new!

Mar 06, 2009 | Vector 955 Radar Detector

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