sensitivity/filtering diffrence?

Let me propose a "sensitivity/filtering" theory.

Radar from a real LEO/Threat is aimed at you and can be received at a much further distance than a false. Most radar to get your speed will be shot directly at you, not from a parking lot at over a 30 degree angle or more. A typical false is usually a weak signal and will ramp up differently than a real threat. Radar from a gun can get your speed at approximately a maximum of 3000ft, how much more sensitivity do you really need? An extra 500, 1000ft, 3000ft? It only takes a few seconds to slow down.

Therefore if you find that equal medium of being "sensitive" but not overly "sensitive" to off axis radar you will have a quieter RD with almost the same real radar detection range.
Now add what some RD manufactures call "filtering" brief delay, thresh hold or whatever they want to call it. Now you have your self a RD with good detection range but not an overly "sensitive" one. Now you have your self a smart filtering system.

If I pick up a real threat with 10 seconds to react on a less "sensitive" RD, and 13 seconds to react with a more "sensitive" RD, does it really matter when it only takes 4 seconds to slow down? :roll:

I think the descriptions should be “sensitive RD” & “smart RD”. sensitivity doesn’t equate to no ticket, the ability to communicate a real threat correctly by the RD and the drivers reaction to that threat equates to no ticket. Its ½ driver ½ the RD responsibility to prevent a ticket. The most sensitive RD in the world won’t prevent a ticket if it doesn’t communicate the real threat clearly and the driver doesn’t react correctly. :wink:

Now what would be awesome is adjustable sensitivity with the ability to adjust off axis sensitivity via GPS location. :twisted:

What about instant on?

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Originally Posted by CJR238

Now what would be awesome is adjustable sensitivity with the ability to adjust off axis sensitivity via GPS location. :twisted:

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I disagree. Sensitivity should be as great as possible. Also, I believe that the off-axis behavior is a function of the physical antenna or horn rather than the electronics or filtering.

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Originally Posted by mikered30

What about instant on?

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Exactly! Also consider around a curve, etc. While the signal that's clocking you is almost always strong, the theory of a radar detector is to detect weak police radar signals from the traffic ahead and provide a useful amount of warning.

Sensitivity doesn’t matter if you have just as good detection range. The off axis is totally from the horn design, but that’s certainly part of the equation for filtering and would be cool if you could adjust it in some way. :D

Imagine driving through the city with off axis sensitivity decreased and it dramatically reduces the falses passed 30degrees but still keeps maximum "detection range" on the road in front of you.

Because detection range isn’t really affected, only off axis sensitivity is I/O would still be good, even around turns.

Just an idea, :roll: even the V1's arrow concept could actively work with filtering.

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Originally Posted by CJR238

Sensitivity doesn’t matter if you have just as good detection range.

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Sensitivity and filtering are mutually exclusive. If you increase one, you decrease the other. If you decrease off axis sensitivity you also lose the ability to detect weaker signals not directly aligned with the road. One of the things I don't like about the V1 version 1.8 is the redesign of the horn to require a stronger signal if it is off axis as compared to the 1.7. I personally would like to see the sensitivity of the 1.8 with the horn of the 1.7

Wow CJR238 couldn't have made a point clearer. I read on the V1 postings about how fast people drive with a V1, and some said at the PSL or maybe 5 over. Your point about how much distance do you really need is something most people don't point out.

I have a cheap Early Warning 3005 radar detector just for giggles.

Darn, it is REALLY quiet in town compared to my V-1! I love it! I mean, no beeps until I am like right in front of a door opener! It really is great!

Then again, I have encountered TRUE police radar....straight on K band and Ka band with the Early Warning unit. And it alerted me at times in less than 1/4 mile esp. on Ka band. One time I was one block ahead of Ka band radar (parked) going away from it and the Early Warning stopped beeping once I got out ahead of that one block distance.

Sure...the selectivity was awesome!!! LOVED IT! But....the sensitivity was especially poor. I know, what do ya expect from a 19.00 radar detector. However, we are talking sensitivity vs. selectivity here. I would much rather have selectivity higher more than anything.

Funny thing is, I do not consider my V-1 "chatty" at all. Never thought it was noisy even going through big metro areas (BIG "L" on).

Sensitivity and filtering mutually exclusive?????

Look at the August GOL test, 9500i within feet of the V1, 9500i has FAR superior filtering.

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Originally Posted by bigalinwv

Sensitivity and filtering mutually exclusive?????

Look at the August GOL test, 9500i within feet of the V1, 9500i has FAR superior filtering.

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X2

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Originally Posted by djrams80

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Originally Posted by bigalinwv

Sensitivity and filtering mutually exclusive?????

Look at the August GOL test, 9500i within feet of the V1, 9500i has FAR superior filtering.

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X2

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X3. The 9500I's sensitivity and filtering have no bearing on each outer. But the 9500I is the exception to the rule of most RD's because of speed sensitivity and GPS lock outs (and I feel horn design).

Look at the 2 pictures below and you will see how radar passed the 2nd off axis bar from the center decrease there range dramatically. Imagine if you could subtract the last 2 bars completely (they are useless anyway because they are passed 30 degrees).
http://www.guysoflidar.com/july-2007/k_1.gif

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Originally Posted by CJR238

Imagine if you could subtract the last 2 bars completely (they are useless anyway because they are passed 30 degrees).

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??? So you think all roads are straight and/or enforcement occurs only on straight sections of road? Radar can and is used beyond a 30 degrees angle to the road, and forget advanced detection around a curve. Tunnel vision is a bad thing when it comes to detection, unless you want detection after the fact.

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Originally Posted by zappy

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Originally Posted by CJR238

Imagine if you could subtract the last 2 bars completely (they are useless anyway because they are passed 30 degrees).

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??? So you think all roads are straight and/or enforcement occurs only on straight sections of road? Radar can and is used beyond a 30 degrees angle to the road, and forget advanced detection around a curve. Tunnel vision is a bad thing when it comes to detection, unless you want detection after the fact.

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Check Again. The 9500i does just fine in the "around the curve" tests on both K and Ka.

http://www.guysoflidar.com/august-20...ctor-test.html

Re-read what I was posting to, you missed the point.

Sensitivity around a curve is obviously important, and tunnel vision is real bad. But radar passed 30 degrees shows only 80% of your speed or less. And radar can only go in striate lines.
Up to a 30 degree sensitivity at over 3000ft will almost be at least a few hundred feet wide span to receive radar. More tan enough to receive radar around a curve. Most radar around a curve received is from reflections too.

The radar passed 30degrees in the above picture is only being received at a few hundred feet anyway.

See the below RD on the far left has tunnel vision, that’s bad. But the 2nd 3rd and 4th to the left of the 1st one has good detection range and off axis to 30 degrees, but is not as sensitive to off axis radar passed 30 degrees.

http://www.guysoflidar.com/july-2007/355.gif

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Originally Posted by zappy

Re-read what I was posting to, you missed the point.

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Thanks for challenging my theory. I find the idea of filtering/sensitivity an interesting topic because I feel they can be 2 different things. I feel that a RD can be made to detect extremely far with out being over sensitive by filtering in some way.

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Originally Posted by CJR238

Sensitivity around a curve is obviously important, and tunnel vision is real bad. But radar passed 30 degrees shows only 80% of your speed or less. And radar can only go in striate lines.

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Some of us have to traverse Interstates with curves. Some curves are already 30 degrees, and a LEO shooting from the inside only adds to that angle. Our best hope against I/O is that we'll get an early warning from the traffic ahead. Thus, a LEO at less than 30 degrees to the current target is often at more than 30 degrees to the driver (next target). In such cases, reducing off-axis sensitivity is not the best answer. Actually, I would prefer if off-axis sensitivity were increased and that faster and more sophisticated filtering based on harmonics be performed. You've made an interesting point about allowing the off-axis sensitivity to be user adjustable (so we can adjust for the terrain), but unless you've got a novel idea in mind, I think that such a feature would only be possible at an extremely high price.

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Originally Posted by bigalinwv

Wow CJR238 couldn't have made a point clearer. I read on the V1 postings about how fast people drive with a V1, and some said at the PSL or maybe 5 over. Your point about how much distance do you really need is something most people don't point out.

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Thanks. :wink: knowing the distance of an actual radar gun can get your speed is important. The longest distance I have seen on a radar gun is 3500ft but in most cases it’s much less 2000-2500ft. besides the fact that the LEO needs to be able to make out who is speeding and anything 3000ft would be difficult.