ESCORT Inc. Announces New Automotive Safety Product: ESCORT Guardian Alert®

[CJR238]

Originally Posted by Nine_c1

X-Band sensitivity on the 9500ix is not up to snuff with the 9500ci. X-Band is overswept by both detectors to pick up LO emissions from cobras to block falses that show up as Ka alerts (3rd harmonic of the Cobra's spewing LO).

so your saying because the CI is more sensitive to X band its able to filter cobras KA falses better?

[Nine_c1]

Originally Posted by CJR238

so your saying because the CI is more sensitive to X band its able to filter cobras KA falses better?

Yes sir. The Cobra's LO operates right around 11.2 GHZ. The 3rd harmonic of 11.2 is 33.6 which is obviously well within the Ka Band.

All Belscort detectors oversweep both the X-Band (10.525) and K-Band (24.150) to pickup up the 1st or 2nd harmonic of the leaking LO emission from the Cobra, and if found, block out the 3rd harmonic which shows up in the Ka Band.

Picking up the 1st harmonic is the easiest since it's the fundamental frequency. Thats why I believe Belscorts do so much better than the Valentine at screening out Cobra's. Escort patented the X-Band oversweep which force's Valentine to continue using K-Band oversweeps alone to find the 2nd harmonic of the leaky LO. Using K-Band oversweeps is not optimal for LO detection as some Radar Detectors use K-Band image filters to suppress leakage of the 2nd LO harmonic..........ie. COBRA!

Screening out Cobra falses should be an easy thing provided the X and Ka band sensitivity of the detector are approximate. The fundamental, or 1st multiple of the leaky LO, will always be the easiest to detect. However, the M4 platform in the 9500ix is not particulary strong on X-Band, having the single horn and primary mixer tuned more for Ka/K sensitivity. The 9500ci dedicates a seperate LNA/Horn/LO/Mixer soley to X-Band reception and so has better balance and the sensitivity on X-Band is more proportional to Ka and K.

[EscortRadar]

Originally Posted by solara

I'm still chuckling over Toter Winkel

That got me too LOL

[Rocky2]

Originally Posted by Nine_c1

Yes sir. The Cobra's LO operates right around 11.2 GHZ. The 3rd harmonic of 11.2 is 33.6 which is obviously well within the Ka Band.

All Belscort detectors oversweep both the X-Band (10.525) and K-Band (24.150) to pickup up the 1st or 2nd harmonic of the leaking LO emission from the Cobra, and if found, block out the 3rd harmonic which shows up in the Ka Band.

Picking up the 1st harmonic is the easiest since it's the fundamental frequency. Thats why I believe Belscorts do so much better than the Valentine at screening out Cobra's........Escort patented the X-Band oversweep which forced Valentine to use K-Band oversweeps alone to find the 2nd harmonic of the leaky LO. Using K-Band oversweeps is not optimal for LO detection as some Radar Detectors use K-Band image filters to suppress leakage of the 2nd LO harmonic..........ie. COBRA!

Screening out Cobra falses should be an easy thing provided the X and Ka band sensivity of the detector are approximate. The fundamental, or 1st multiple of the leaky LO, will always be the easiest to detect. However, the M4 platform in the 9500ix is not particulary strong on X-Band, having the single horn and primary mixer tuned more for Ka/K sensitivity. The 9500ci dedicates a seperate LNA/Horn/LO/Mixer soley to X-Band reception and so has better balance and the sensitivity on X-Band is more proportional to Ka and K.

That was some good info, if you turn X band off do you open yourself up more Cobra Ka falses.

[EscortRadar]

Originally Posted by Nine_c1

... since it uses doppler radar, is it going to be another constant source for false alerts on our Escort radar detectors?

Only if everyone around you has a Guardian Alert and is driving in reverse. The signal is only present when backing, it isn't always on.

The Guardian Alert operates within X band but is modulated, our detectors will see the signal but should not alert to it.

[CJR238]

Originally Posted by EscortRadar

Only if everyone around you has a Guardian Alert and is driving in reverse. The signal is only present when backing, it isn't always on.

The Guardian Alert operates within X band but is modulated, our detectors will see the signal but should not alert to it.

I'm assuming for the same reasons Nine_c1 mentioned in his explanation of Cobra filtering.

[Nine_c1]

Originally Posted by Rocky2

That was some good info, if you turn X band off do you open yourself up more Cobra Ka falses.

I have to say no. Turning X-Band and K-Band off had virtually no effect in response times when I tested the RedLine for how quick it responds to Ka signals (QT testing). This leads me to believe that the detector is still sweeping those frequencies for the purpose of finding and blocking LO emissions from other detectors.

Also, most of us have X-Band turned off and we are still realizing fantastic Ka false suppression to the Cobras.

Since the bandwidth on X-Band is only 100MHZ and K-Band is a single 200MHZ channel, there is not alot of time to be saved by eliminating the actual sweep on these two frequencies anyway. Therefore, I believe the detector just does not report any signals detected in these bands when they are turned off.

Turning off Ka band certainly does eliminate the actual sweep time required to scan the 2.6 GHZ channel. If you turn Ka band off (at least on the M3) you have yourself a lighting quick detector for X and K Band. I was able to consistently pick up .13 second K-Band bursts with the RedLine when I had Ka Band turned off.

[Nine_c1]

Originally Posted by EscortRadar

Only if everyone around you has a Guardian Alert and is driving in reverse. The signal is only present when backing, it isn't always on.

The Guardian Alert operates within X band but is modulated, our detectors will see the signal but should not alert to it.

That's exactly the situation I face every day at Walmart! Except not everyone has a Guardian yet.........but the morons in that parking lot sure do need one.

Modulated X-Band.........my worries are laid to rest! Thanks ER for the reply!

[EscortRadar]

I found out it is technically called swept X band, not modulated. Our M3s do not see it so no worries.

[Nine_c1]

EscortRadar
Official Escort Rep
Join Date: Apr 2009
Posts: 1,132



Quote:
Originally Posted by solara
I'm still chuckling over Toter Winkel

That got me too LOL

You guys have to brush up on your Deutsch! Toter Winkel means Dead Angle.......ie. blind spot......in German.