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I just bought my cobra xrs 878. I was driving and my radar did not alert until I was beside the cop car any suggestion on why it was so late to respond.

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Need a pop 3 dectector

Posted on May 26, 2011

  • danieledmund May 26, 2011

    What's that and I can't just set something.

  • ty May 27, 2011

    pop 3 is the one step up that they use our tax dollars for and its usually on the 16 band dectectors. k and x band are kinda worthless anymore its all laser any more

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1 Answer

I have the cobra xrs 9345 that my friend borrowed and when i got it back in plugged it in it just shows and 8 on the screen is there anyway i can get it back to normal?


hello my name is kenrik. About a year i bought a radar detector everything work good for like 8 month after that my radar don't make any detection i went by a cop using a laser gun and the radar didn't detect anything so what i can do ?
the model is cobra xrs 9345

Oct 01, 2010 | Electronics XRS9345 Radar Detector

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How do you turn off the POP ALERT on cobra 878? I turned it on and now it is annoying me becuase it goes off constantly... Does anyone have manual or suggestion on how to turn off? Please Help


Press and hold Dim and City buttons for four seconds
Voice Response with say, "Pop On" or "Pop Off" Tone Response will be, Pop On = Two Beeps, Pop Off = One Beep
You can find the full manual here:
http://www.manualnguide.com/manual/cobra-xrs-878-manual/

Sep 11, 2010 | XRS 9440 Radar Detector

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Doesn't detect all cops.


i drove right past highway patrol with radar gun pinter at me and it didn't make a sound...its garbage..dont buy

Jul 09, 2010 | XRS 9330 Radar Detector

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The Cobra XRS 9445 14 Band Radar Detector false alerts....


mine does the same thing...b4 i had the same model and it never did this...do u happen to have an aftermarket security system in your vehicle

Jun 10, 2010 | Electronics XRS9445 Radar Detector

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I HAVE A CORA XRS 9685 RADAR AND IT DOESENT WARN ME WHEN I AM NEAR COPS?


find a mobile speed trailer somewhere in a neighborhood just because it doesnt alert when you are next to a patrol car doesnt mean it isnt working 9 out of 10 the radar gun isnt on in the car or the gun is set to alert at a higher speed than what you are doing
i always check mine at the mobile speed trailers that the cops set up in neighborhoods

Apr 21, 2010 | XRS-9685 Radar Detector

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Cobra XRS 9440 will not detect police radar. Does not alert when I drive by a police car. How can I fix this problem? Is there a way to change the settings so that I can be alerted when there is police...


Radar detectors are not police detectors. Radar detectors only alert to police when the police have their radar guns turned on. Most police officers operate their radar guns in "instant-on" mode rather than leaving their radar guns turned on continuously. Instant-on operation involves very briefly turning the radar gun on for up to a second or two in order to get a vehicle's speed.

Cobra radar detectors are known to have great difficulty detecting the 35.5 Ka band radar gun frequency. This should be considered a serious problem since 35.5 Ka is the second most popular Ka radar gun frequency following the most commonly encountered 34.7 Ka radar gun frequency. There isn't much that Cobra can do about this issue since their competitors hold all of the really good patented solutions for detecting 35.5 Ka police radar while ignoring false alerts caused on this frequency due to other radar detectors.

Apr 16, 2009 | XRS 9440 Radar Detector

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Undersatanding the 12 bands of cobra xrs 797


Its all marketing hype. Cobra breaks up the three X, K and Ka bands into sub-bands, and they do the same for the single 904nm laser wavelength. There are no sub-bands for X or K band. In the USA, Ka band radar guns operate on three Ka band frequencies: 33.8, 34.7 nd 35.5 MHz. Cobra also breaks up the single laser band based on the known pulse rates of various laser gun models. Yet in general if you get a laser alert from a nearby cop then likely you have been tagged and will be getting a ticket.

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Cobra xrs757 X Band


The x-band is the considered a "trash band". It picks up things like automatic doors at supermarkets and such. About every radar detector made has an X band for non-police radar. There is no way to turn this band off on the XRS-757.

Holding down the dim button for 2 seconds turns the V alert on/off
Holding down the city button for 2 seconds turns the Spectra on/off
Holding both city and dim together for 2 seconds turns K and Ku band on/off.

Dec 18, 2008 | XRS-757 Radar Detector

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I have a cobra radar dector esd 737 and i sdoesnt pick up cops tell they are like not even a half a mile ahead of you and tips or ideas how to get it to work better


Detecting of radar or lidar emissions depends on mounting of detector.In My experience it is best to mount it just above windscreen wipers.You must check if your detector is visible from license plate level. This is important for laser detection. For other measuring devices it's only important to be visible.Higher mounting facing downwards will reduce false X and K/Ka signals.It will reduce detecing of true as well, so it is all up to you.You must know that laser detecting only covers your car.It d'ont matter if a cop is 300m or 1800m away.X band has a large emission, and it is easily detected.K/Ka band is a pulse emitting and has a lot narrow detecting point.It is effective at max 800m.In ether case speed can be reduced 20-30 km/h in city, and 30-50 km/h on highway.

Apr 25, 2008 | ESD 7000 Radar Detector

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