Question about XRS 9440 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 nearby? I read the instructions manual and could not find any helpful info.

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  • privateer666 Apr 20, 2009

    Seems like a very low sensitivity. 100yards max... i have the same issue

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  • 134 Answers

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.

Posted on Apr 26, 2009

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2 Answers

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

1 Answer

INSTRUCTION MANUAL FOR A COBRA XRS9940


http://www.cobra.com/pages/product-manuals#Radar Detectors

That's the MFG link. I found your unit but they are doing updates to their system & will be back up and running shortly. Hope this helps

Jun 23, 2009 | XRS 9440 Radar Detector

1 Answer

NOT PICKING UP SIGNALS


Radars are like just about anything else you buy these days, you get what you pay for. If you want a cheap but most reliable for the price I would suggest the Whistler XTR-695 *est. price 150 bucks. Although many detectors are prone to being detected by radar detectors (used by law enforcement) this one is a little more likely. So if your state has a ban on radars I wouldnt buy. As far as distance in signal pick up the Valentine One I would go with *est.price400 bucks.

Jun 21, 2009 | XRS 9440 Radar Detector

1 Answer

These don't detect like advertised


The detector will only work if there is a signal transmitting at the time. Depeding on what country you are in, police usually don't activate their radars three minuites before they register your speed. These are more meant for stationary speed cameras than hand-held ones.

Jun 21, 2009 | XRS 9440 Radar Detector

1 Answer

What is pop and spector mean


POP is a type of radar mode which only a couple of radar guns have. In essence, radar gun in POP mode emits an extremely brief signal to measure a car's speed. This brief signal lasts for less than 1/5 of a second. POP mode can not legally be used to write speeding tickets since it is not as accurate as the radar gun's normal operating modes, and since POP mode provides absolutely no radar tracking history.

Most people turn off POP mode in their radar detector's options since POP radar is very rarely encountered and since users experience excessive false alerts with POP turned on.

Spectre refers to the Spectre radar detector detector (RDD) which police use to locate drivers who are using radar detectors. The current Spectre models in use by law enforcement are the Spectre III and IV models. Some Cobra radar detectors claim to be able to detect the Spectre I. This is of no value since all Spectre I RDDs have been upgraded to later Spectre models which Cobra radar detectors can not detect. In short, turn Spectre detection off since this feature is a needless source of false alerts.

Apr 22, 2009 | XRS 9330 Radar Detector

1 Answer

Cobra radar detector


Police usually do not leave their radar guns turned on all of the time. Indeed, most police officers prefer to use the "instant-on" technique to nab speeders. Instant-on works by leaving the radar gun in standby mode (no radar emissions) and then releasing a trigger button to instantly turn on the radar gun to measure a vehicle's speed.

You can check to see if your radar detector is detecting radar by putting it in Highway mode and then driving to a shopping center or other businesss location which has microwave radar automatic door openers. You should get either X band or K band alerts for these microwave automatic door openers. If you do not get any alerts for these door openers, and after having checked a few other locations which have microwave automatic door openers, then this would indicate that your radar detector is defective.

Apr 20, 2009 | XRS 9440 Radar Detector

1 Answer

Reading the radar detector


These are just the frequency ranges, or "bands" that your detector is detecting the frequencies...

X, K, Ka (Kappa-Alpha) are different bands of frequencies.

Mar 12, 2009 | XRS 9440 Radar Detector

1 Answer

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

1 Answer

Have a cobra radar detectors while I am in uSA but do not know what the different alerts mean. Can anyone tell me?


X, K, and Ka Superwide are the radar bands that are used by police radar guns. X band was the first band used for by radar guns, but is now the least used. All radar detectors that we carry detect all 3 of these bands.

Aug 03, 2008 | XRS 9330 Radar Detector

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