Radar Frequency Discrepencies

Heywood

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I know I was talking to someone about how different detector see different radar signals and present them to the user.

I had a little time today, so I went out with a collection of RD`s that will show the frequency and gave it a shot. I hit each detector with my Bushnell, Stalker ATS, and Eagle Talon.

I used my R3, R-Ex, Max, and RX65.

They were closer than What I thought they would be in a controlled setting. I`ve noticed in one of my videos that the R3 would show 24.147 and the R-Ex showed 24.157.

Anyhow here`s the video

 

drtoddw

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When I've run the EX and the R3 at the same time, I've noticed they are usually close but rarely can be quite a bit different.
 

InsipidMonkey

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How close were the antennas to the detectors when you were doing this test? The accuracy of the displayed frequency decreases significantly if the detector is being over-driven by a strong signal, and could explain much of the variability seen.
 

Heywood

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Window was open and shot out to the side. Nothing right at the detector.
I was careful not to overdrive them.

I thought they were pretty close across the board. Did you see something that I didn’t notice??

If your talking about when I seen the difference where they were far apart, it was this video.



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InsipidMonkey

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I think it's pretty clear the detectors are still being over-driven. The R3 initially shows two Ka signals when hit with 35.5, the EX has the frequency change from 34.750 to 34.724 with the Stalker, the Max shows 3 different K band frequencies, and two Ka signals when hit with the Stalker, and the RX65 shows 33.728 after the 35.5 signal stops.

Still, it's an interesting test and good to see the agreement!
 

Heywood

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Hmmm. I’ll have to look again.

A lot of those changes were well after I had let go of the trigger. I only pulled the trigger to get the reaction and then let go.

It’s easy enough for me to do it again. I was using my GoPro for the video. I suppose I could leave it running, get out and fire each gun towards the back of my truck?


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Heywood

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Had to go out and put the wife's roof up and doors back on her wrangler, so I did a 2nd video. I stood outside and shot away from the truck to make sure there was no overdrive issues. You can see in the meters that they were never spiked.

 

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Where are you shooting them from? Are you down the street a good ways out in the rain?

If not, I don't believe you have a "Clean" controlled setting. They were probably to close to the transmitted source causing mixing and front end receiver overload plus there were other devices with antennas in the vehicle (read possible additional mixing). Lastly most detectors are more accurate from the front.

An open field at 200 yards, transmitting at the front of the vehicle, with all other detectors on a table behind the shooting point except the one being tested in the vehicle would be a better clean controlled setting.

The test driving towards a speed sign has two massive problems, high front end overload plus tons of mixing going on from three active plugged in devices. It is impossible to "Cleanly" test any detector if another detector is in the vehicle (plugged in or not, they all have antennas).
 

Bossdad71

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nice test, thank you. looks like you were getting a bit of rain up that way
 

Heywood

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Both tests seemed pretty close. None of the detectors spiked or peaked.

The 2nd round was taken outside the truck. Windows closed, gun pointed back to avoid overdrive. The signal strength meters seemed to be in a good spot.

The video I posted of the multiple signs? Yeah there was a lot going on. I can see how that can affect it. That’s why I tried this a couple of times.

I haven’t studied the videos too closely, but both rounds seemed to deliver close to the same results.

I wasn’t seeing big differences between the R3 (24.147)and R-Ex(24.257) here.



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Heywood

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nice test, thank you. looks like you were getting a bit of rain up that way
It’s about time. It’s been smoking hot up here for 2 weeks straight.


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Driver66

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Interesting, thanks for sharing.
 

LinuxD

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If you want to get a good idea take a rubber band on your Bushnell and put it on constant Xmit, position it along a road, drive a mile or so down the road turn around and proceed towards signal, noting freq shown and distance from signal when it is aquired. Can be done with the others and would yield better results. The bushnell is great for testing sensitivity as nominal output is about 5mW. My two Kustom guns according to specs are 15 to 40 mW each. Good thing is I have a tuning fork for K band from Kustom (and certificate) for 35 mph to check each gun with before I start doing any type of testing.
 

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