My cobra 15 band 360 laser radar detector doesn't pick up any radar anymore.I have all settings on.anyone have an idea what might be wrong?thanks

Maybe the fuse for the accessory port / cigarette lighter is blown. Check the fuse map for your car and confirm if the fuse is good or not. Or, if you have another device that uses the port, plug it in and see if it gets power.

this is the product registration page , if you can not figure that out stop swearing on here. it was on the first link I sent you
https://www.cobra.com/support/product-registration




https://www.cobra.com/support/product-registration

I would try to steal one from a mechanical ink pen and cut it to length. Worth a shot.

Has anyone had their Cobra radar detector flash low with a deep beep?

You can get the manual on the link below.

https://cobra.com/downloads/manuals/9200_MANUAL.pdf

Good Luck

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.

Here is a link to Cobra's RD product manuals page:

Cobra - Product Manuals

To the original poster, the officer could have used laser, vascar, or pacing to issue a speeding ticket. The officer also could have used a very quick burst of instant-on radar which Cobra brand radar detectors are notorious for not detecting. The officer also could have used a 35.5 Ka band radar gun. Cobra and other import brands of radar detectors usually have great difficulty detecting 35.5 Ka band radar.

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.

try checking your setting>alert> and make sure all your settings are in the right order. i usually leave it on X+K and leave the Ku Band off since its european and not yet in California. Leave the K bands on and check it out after that. If it still does not work, then if you have a GPS or any other type of strong wireless intereferences then it will greatly reduce the signal distance. Mid-Windshield is the best place to mount the radar since the Laser detector needs a full 360' view and have a clear path looking ahead and through the back seats to the back.

Assuming the model number is COBRA XRS 9500CS 11-BAND RADAR/360*
LASER DETECTOR WITH DIGVIEW DATA DISPLAY
& VOICE ALERT
This is what we can find out about it.
DETECTS 5 RADAR SIGNALS: XBAND, KBAND, KA SUPERWIDE, VG-2 RADAR DETECTOR-DETECTOR, SPECTRE 1 RADAR DETECTOR-DETECTOR

DETECTS 4 LASER SIGNALS: LTI 20-20 LASER, ULTRA LYTE LASER, PROLASER, PROLASER III

2 SAFETY SYSTEMS: SAFTETY ALERT & STROBE ALERTS DIGVIEW DATA DISPLAY & VOICE ALERTS
http://www.fixya.com/support/p237601-cobra_xrs_9500cs_radar_detector/manual-313

I again assume the above model number......
Hope this helped some...
Kevin