Radar Speedcam 1 mile long-range detection! QUESTION: Does detection range increase at night?

skd

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So, Uniden R1 vs Siemens Sitraffic ERS 400 low-powered speed cam. The same one which I tested here a couple of months ago by R1 and the same one @Marty K happened to test here by his R7 too. You can see there results in daylight. Not very satisfying with R1 and as we could assume a little better with R7.

Yet another try from opposite approach today on my way to a neighboring city:

But what happened later on my way back completely blew my mind. Calculated with average speed 70 km/h approximately 1.7 km first sniff distance, that is over a mile distance from that cam. Then another two sniffs prior to entering the kill zone. Everything you see is at Highway mode with all bands at 100%, FW 1.46, K filter ON, TSF OFF, etc. How is this possible? R1 detected it at 24.084 at the whole time which is different from 24.063 I've seen before. I've never gone by that cam at night before. But AFAIK every band is radio waves and frequencies at the end of the day. I have noticed before that for example signals from the radio stations significantly improve over night and you can hear some stations much clearer at night. Did you notice too? Could this logic somehow be connected with this case?

This is the dropped video from my dash cam. I intentionally have not cut the whole detection time some minute and a half. At the end I FF-ed it for a bonus for you to see you how you should or shouldn't be overtaking here happy0199.gif
 
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Marty K

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So, Uniden R1 vs Siemens Sitraffic ERS 400 low-powered speed cam. The same one which I tested here a couple of months ago by R1 and the same one @Marty K happened to test here by his R7 too. You can see there results in daylight. Not very satisfying with R1 and as we could assume a little better with R7.

Yet another try from opposite approach today on my way to a neighboring city:

But what happened later on my way back completely blew my mind. Calculated with average speed 70 km/h approximately 1.7 km first sniff distance, that is over a mile distance from that cam. Then another two sniffs prior to entering the kill zone. Everything you see is at Highway mode with all bands at 100%, FW 1.46, K filter ON, TSF OFF, etc. How is this possible? R1 detected it at 24.084 at the whole time which is different from 24.063 I've seen before. I've never gone by that cam at night before. But AFAIK every band is radio waves and frequencies at the end of the day. I have noticed before that for example signals from the radio stations significantly improve over night and you can hear some stations much clearer at night. Did you notice too? Could this logic somehow be connected with this case?

This is the dropped video from my dash cam. I intentionally have not cut the whole detection time some minute and a half. At the end I FF-ed it for a bonus for you to see you how you should or shouldn't be overtaking here View attachment 133938
I had almost identical experience there (direction-wise), but all during day time. I think the difference in range is simply the direction you approach it from, as this cam is only pointed one way. One factor that can affect the range is the amount of traffic and vehicle size/position around that camera that the signal can reflect off. If traffic is present near the cam, more chances you will get an early (longer range) initial alert...
 
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skd

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Thanks for throwing some light on this, Marty. You're the man! However... one big "HOWEVER" remains here for me. You know, there has been always traffic there. I have been driving with my R1 by this section a couple of times but only in daylight. I've had once one longer detection, like with your R7, but never that long like this one. My detector never stops to amaze me. I love it.
 

Marty K

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Thanks for throwing some light on this, Marty. You're the man! However... one big "HOWEVER" remains here for me. You know, there has been always traffic there. I have been driving with my R1 by this section a couple of times but only in daylight. I've had once one longer detection, like with your R7, but never that long like this one. My detector never stops to amaze me. I love it.
Yes, unfortunately this one of them cases that we would never know for sure. Unless you drive by X number of times, and all passes are with same exactly traffic, same weather, same time of day/night - only then you could maybe see a pattern. Every morning on my commute to work, when I enter the ramp to join the freeway, in the distance (about half mile) I see Walmart (supermarket), but only about half the time I pick up the false K alert from the store's automatic door openers. It's just a hit and miss, or weaker/stronger signal...
 
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skd

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Everything you are saying makes sense. Thank you very much for your clarifications and for the comparative example from the Walmart door openers. It will take some time for me to clear that subtle elements in my archive of facts because I can't be driving by this camera location every night... especially, but will have other chances at night or evening time. For now, when I think about it, I have been left with the impression by other night detection cases that range becomes more or less better at night in comparatively equal conditions during a daytime, especially when shiny and the sun physically emits radiation interfering with the radio waves, which was my main puzzle. Time will help to figure this out.
 

Marty K

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Everything you are saying makes sense. Thank you very much for your clarifications and for the comparative example from the Walmart door openers. It will take some time for me to clear that subtle elements in my archive of facts because I can't be driving by this camera location every night... especially, but will have other chances at night or evening time. For now, when I think about it, I have been left with the impression by other night detection cases that range becomes more or less better at night in comparatively equal conditions during a daytime, especially when shiny and the sun physically emits radiation interfering with the radio waves, which was my main puzzle. Time will help to figure this out.
There are some studies that explain how the ionosphere affect radio waves at night, in particular AM / FM radio broadcast signals (you did mention this I believe). Not sure if this applies particularly to K / Ka bands, but it does have logic. Maybe that is what you have experienced.
 
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ARkaband

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In my personal experience, I feel I get longer range at night. Maybe it's just because there is less traffic.
 

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