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

skd

Learning to Fly
Beginner User
Joined
Jun 3, 2019
Messages
258
Reaction score
443
Location
Bulgaria
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
 
Last edited:

Marty K

Always Driving Vigilantly
Intermediate User
Premium Member
Joined
Nov 27, 2018
Messages
773
Reaction score
1,805
Location
Bulgaria
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...
 

skd

Learning to Fly
Beginner User
Joined
Jun 3, 2019
Messages
258
Reaction score
443
Location
Bulgaria
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

Always Driving Vigilantly
Intermediate User
Premium Member
Joined
Nov 27, 2018
Messages
773
Reaction score
1,805
Location
Bulgaria
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...
 

skd

Learning to Fly
Beginner User
Joined
Jun 3, 2019
Messages
258
Reaction score
443
Location
Bulgaria
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

Always Driving Vigilantly
Intermediate User
Premium Member
Joined
Nov 27, 2018
Messages
773
Reaction score
1,805
Location
Bulgaria
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.
 

ARkaband

Safe Speeder
Intermediate User
Joined
Jul 28, 2019
Messages
587
Reaction score
1,274
Location
Little Rock or Auburn
In my personal experience, I feel I get longer range at night. Maybe it's just because there is less traffic.
 

Kennyc56

Ford Lover-I/O hater!
Advanced User
Lifetime Premium Member
Joined
Feb 22, 2018
Messages
3,809
Reaction score
11,045
Location
I/O Hell, Aka Eastern N.C.
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
Great videos @skd ! I especially liked the way you passed those two trucks! I love doing that with my Boss 302! I have 4 R1's and they are all monsters!
 
Last edited:

skd

Learning to Fly
Beginner User
Joined
Jun 3, 2019
Messages
258
Reaction score
443
Location
Bulgaria
Great videos @skd ! I especially liked the way you passed those two trucks! I love doing that with my Boss 302! I have 4 R1's and they are all monsters!
Thanks, @Kennyc56. I don't recommend anyone to overtake like this though. The truth is that I didn't see the second truck ahead and it was a fast intuitive decision for me to undertake longer than planned maneuver. But risky maneuvers like this can be seen often on this road especially. It will be what it is until we will have constructed the new highway that should be done in the next couple of years.

As to this cam and why I consider this case amazing, I think it should be boldly underlined that it's extremely low-powered and it's hard to be detected in normal circumstances even in front approach during the day until some, say, 100-150 meters. It takes a really sensitive detector which is able to achieve what you can see in the video. With all that said, we can write down in the archives this R1's detection like "monstrous" :)

Unfortunately this LP K band traffic cam isn't the baddest ass. There are always more sinister things LOL
 

LinuxD

Prepare for warp speed.
Advanced User
Premium Member
Joined
Sep 5, 2015
Messages
1,070
Reaction score
1,809
Location
Youngsville,North Carolina
Things such as air density due to cooler/warmer weather, amount of moisture in the air, amount of traffic present all play a part in how radar signals travel and in the larger scheme of things how all radio signals travel through the atmosphere.

I've a hotel about 3/4 of a mile from me that has auto door openers. I've got it locked out, but depending on atmospheric conditions there are times that I pick it up outside the lockout radius.

There have been times while 70 miles away from a UHF Digital repeater where i could get into it just perfect during periods of cool dry air in the area, whereas normally there was no way i could get into it .

Once at VHF frequencies I was able to make contact with another Ham Radio Operator with a 4 watt HT to another 4 watt HT at a distance of about 150 miles due to a temperature inversion and tropospheric ducting in the spring time.
 
Last edited:

Marty K

Always Driving Vigilantly
Intermediate User
Premium Member
Joined
Nov 27, 2018
Messages
773
Reaction score
1,805
Location
Bulgaria
Thanks, @Kennyc56. I don't recommend anyone to overtake like this though. The truth is that I didn't see the second truck ahead and it was a fast intuitive decision for me to undertake longer than planned maneuver. But risky maneuvers like this can be seen often on this road especially. It will be what it is until we will have constructed the new highway that should be done in the next couple of years.

As to this cam and why I consider this case amazing, I think it should be boldly underlined that it's extremely low-powered and it's hard to be detected in normal circumstances even in front approach during the day until some, say, 100-150 meters. It takes a really sensitive detector which is able to achieve what you can see in the video. With all that said, we can write down in the archives this R1's detection like "monstrous" :)

Unfortunately this LP K band traffic cam isn't the baddest ass. There are always more sinister things LOL
That MRCD is indeed scary. I wonder what would be the range if approaching from the other side...
Post automatically merged:

Things such as air density due to cooler/warmer weather, amount of moisture in the air, amount of traffic present all play a part in how radar signals travel and in the larger scheme of things how all radio signals travel through the atmosphere.

I've a hotel about 3/4 of a mile from me that has auto door openers. I've got it locked out, but depending on atmospheric conditions there are times that I pick it up outside the lockout radius.

There have been times while 70 miles away from a UHF Digital repeater where i could get into it just perfect during periods of cool dry air in the area, whereas normally there was no way i could get into it .

Once at VHF frequencies I was able to make contact with another Ham Radio Operator with a 4 watt HT to another 4 watt HT at a distance of about 150 miles due to a temperature inversion and tropospheric ducting in the spring time.
Thank you for the input, very informative!
 

skd

Learning to Fly
Beginner User
Joined
Jun 3, 2019
Messages
258
Reaction score
443
Location
Bulgaria
Things such as air density due to cooler/warmer weather, amount of moisture in the air, amount of traffic present all play a part in how radar signals travel and in the larger scheme of things how all radio signals travel through the atmosphere.

I've a hotel about 3/4 of a mile from me that has auto door openers. I've got it locked out, but depending on atmospheric conditions there are times that I pick it up outside the lockout radius.

There have been times while 70 miles away from a UHF Digital repeater where i could get into it just perfect during periods of cool dry air in the area, whereas normally there was no way i could get into it .

Once at VHF frequencies I was able to make contact with another Ham Radio Operator with a 4 watt HT to another 4 watt HT at a distance of about 150 miles due to a temperature inversion and tropospheric ducting in the spring time.
Thank you, LinuxD. This is an excellent addition for understanding the bigger picture of how things can be varying.


That MRCD is indeed scary. I wonder what would be the range if approaching from the other side...
If you have watched my July's tests (if I could call it this way), you will get an idea. You can follow the first link from the first post. I've never returned facing this MRCD camera but suppose the range would be something alike. Range at direct approach is always an idea better with filters off, tsf off, pop off. Well, I should put some doubt aside because in reality I've never tested this exact camera in front run. I have been still waiting some nice firmware update by Uniden which I can test going around the nearby MRCD cameras. It is pretty clear now that there is nothing more to be shown better than from @Heywood's tests, @Dukes's tests or even mine.
 

Heywood

Learning Something New, Still Dying Stupid
Corgi Lovers
Advanced User
Lifetime Premium Member
Joined
May 12, 2016
Messages
4,964
Reaction score
9,868
Location
The Tail Lights Pulling Away From You
If you look at my February test, you can see the difference in range heading towards the MRCD rig.
The “T” on the left side of the ledger designated me heading towards the MRCD rig facing the MRCD antenna with the R3.
There’s others from those tests are in the complete thread.
This was just an example of the R3’s results.
 

Attachments

Last edited:
  • Like
Reactions: skd

Discord Server

Latest threads

Forum statistics

Threads
85,337
Messages
1,297,182
Members
21,523
Latest member
EMCCM
Top