Puzzled... Uniden R3 not alerting, but not broken. (1 Viewer)

Derrick Brown

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My Uniden R3 has been working great and still works, but I came across a portable speed unit one night and it never made a sound to my surprise. I have updated to the latest 1.48 firmware, turned on everything thinking it was a X-band since I have it turned off. I have turned on X, K, KA, MRCD, Laser and turned off all filters and even have K, Ka Pop on and it will say nothing as I pass by it multiple times. However, it still alerts me to other signals and vehicle bsm. Chrysler Vans are always K 24.160 usually and I still get other alerts, but this road sign is using something the R3 can not detect which concerns me for obvious reason. I have driven passed it several times and no sound with all filters off and all detecting variants on. I've attached a photo of the R3 working 3 mins after leaving the portable speed unit following a Chrysler Van. Can anyone help with this. I am totally lost and now worried somewhat.


109683
 

thebravo

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It's fully possible that the speed sign is operating outside the minimum scanning frequency of the detector on K band 24.050. MRCD (which is a frequency modulated K band) does go lower than that which is why the R3 isn't the ideal detector for MRCD as it is hardware limited above the minimum frequency MRCD can hit. as long as it's alerting to BSM's and legit police radar then it's working correctly, it may just be able to detect that sign due to frequency limitations.
 

Gowski

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Looks like you are in Advanced mode, what percent is your K set to?
 

westwind77

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I would say turn the K filter off but it seems you have already tried that. My local towns all use the trailers identical to that and my units pick it up with no issues, but it is obviously within rage. I do not remember any of them being very high or very low either.
 

cihkal

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It's fully possible that the speed sign is operating outside the minimum scanning frequency of the detector on K band 24.050. MRCD (which is a frequency modulated K band) does go lower than that which is why the R3 isn't the ideal detector for MRCD as it is hardware limited above the minimum frequency MRCD can hit. as long as it's alerting to BSM's and legit police radar then it's working correctly, it may just be able to detect that sign due to frequency limitations.
If it's in the US we've not seen approved FCCID listings for speed enforcement systems that operate below 24.050

Not saying some don't drift, but I haven't seen the Chicago MRCT cameras change with the cold weather.

Could it also just be filtering the signal? Unless the road sign is used for speed enforcement it may have a modulation scheme or some other characteristics that dont match known threats. Turning off filters on Unidens has never been equal as say turning them off on a V1. There seems to always been some type of baseline signal filtering. If it's just a regular speed sign it could very well have drifted out of the R's range since it's not used for speed enforcement.

Sent from my Pixel using Tapatalk
 
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Heywood

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I found an issue on 1.46 when I had MRCD on. It would omit some of the K band speed signs around me.


Since I’ve upload 1,48, it’s now picking these up normally. Doesn’t matter if MRCD is engaged or not.

I did a similar video on October 2018 as well on another speed sign miss.

It could be out of the range of the R3 or its settings.
The easiest way to see is if you had a couple of other RD’s to check against it. See if they would alert and not just the R3.
 

RRJ

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There is a sign around me that I’ve suspected of fluctuating the signal. It is in a canyon so it’s hard to pick up until you round the corner to come at it for about 1/8 mile. There are times the R1 pickes it up the moment it comes into view and keeps the signal until I pass, times it picks it up initially and drops it well before I pass, times when it picks it up late, and times when it doesn’t alert at all. All of these are on K narrow at about 60 to 70 percent sensitivity, depending on the day. I can see weather playing a part, but it seems theire is no consistency between behavior and weather patterns. I don’t know if it’s even possible to fluctuate signals, but I know I can never expect consistent R1 behavior to that sign.
 

Heywood

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Yes it’s very possible. I have a course of about 12 of these solar powered speed signs.

They are all over the place frequency wise. 24.119 to 24.180.

Lots of factors involved, especially the solar ones. The biggest amount has to do with battery strength.

The other factors is weather, amount of traffic passing by it while recharging, temperatures, lots of them.

The ones by me almost change day to day and never the same.
 
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Derrick Brown

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Looks like you are in Advanced mode, what percent is your K set to?
K Percentage was set to 100. After reading the other post, I'm believing it is below/above what the threshold of what the R3 can pick up.
-- Double Post Merged: --
Try turning off MRCD and see if alerts without it enabled.
When I initially encountered the mobile unit, I was still using V1.37 and thought, this may be an MRCD. So i updated to V1.48. So the unit didn't have MRCD originally and with it, it didn't make any difference.
 
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JustinP

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The R series has some filtering in hardware that filters out a lot of speed signs, even with all other filters off. I have yet to see it with a portable unit, but sounds like that's what happening.
 

Got Jeep

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You cannot accurately test a RD with a speed sign. Too many variables.
Your RD is working fine. Put it behind you and hammer down.
 

cowboycasey

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When I went to 1.48 I saw the same things happening with speed signs, seems they were disappearing or elerting the last 200 to 300 feet.. Not sure if the R3 "knew" it was a speed sign but made me very nervous and I changed back to 1.37... I get a great ramp up and range on them again..

I have no idea what it was doing or how it was doing it. I just want a detector that tells me there is a radar signal the farthest away as possible....
 

Derrick Brown

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When I went to 1.48 I saw the same things happening with speed signs, seems they were disappearing or elerting the last 200 to 300 feet.. Not sure if the R3 "knew" it was a speed sign but made me very nervous and I changed back to 1.37... I get a great ramp up and range on them again..

I have no idea what it was doing or how it was doing it. I just want a detector that tells me there is a radar signal the farthest away as possible....
I was using V1.37 when I initially came across this mobile unit. I updated to V1.48 and checked it again and no difference. I didn't have any issues with V1.37. I'll run V1.48 for a while to see if I can tell a difference. If not, I will be using V1.37 again. V1.48 does seem to cut down somewhat on the K false alerts, but that may just be me thinking. More use will tell.
 

fishing66

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There are a ton of radar signs out there to which detectors will not alert. The Houston Radar PNL10 is notorious....it uses a low-powered patch antenna, is usually solar-powered and detectors just don't alert to it. I run across two of them on a frequent business route and the R3 never alerts even though it displays my speed (albeit at close range).
 

samq45

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I come across a lot of speed signs where the R3 and other newer detectors will not alert all of the time - might be 20-30% of the time at best. Seems to alert more times when the sign is forward facing. Most of these K band signs around here have a blue LED light in the middle of them.

I would suspect the modulation is close to BSMs (they cost less) and the detectors are filtering them out as non LEO radar.
 
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LinuxD

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I've a speed sign near me that on rare occasion my DFR7 will alert to. I had it locked out because it is a solar powered unit and in a tight "S" curve in a 25 mph zone, I cleared my lock outs a while ago and I can "sometimes" get an alert before i crest the railroad bridge and enter the "S" curve but they have the sign and gun pointed very well so it only gets a reading as you clear the first curve and start to make the 2nd. Prior to that it was a PITA as it wasn't aimed right and was spewing K band out all over. The freq on it varies quite a bit depending on temperature and the amount of sunlight the panels have received.

Don't use speed signs as a point of reference to how well your detector is preforming.
 

Derrick Brown

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I come across a lot of speed signs where the R3 and other newer detectors will not alert all of the time - might be 20-30% of the time at best. Seems to alert more times when the sign is forward facing. Most of these K band signs around here have a blue LED light in the middle of them.

I would suspect the modulation is close to BSMs (they cost less) and the detectors are filtering them out as non LEO radar.
Thanks, Seems that way. I have come across many mobile units that get detected, but this was the first not to be detected. I came across another mobile unit yesterday that was detected about 1/2 mile away as soon as I turned onto the street, the R3 went crazy with no sight of the unit.
 

jprd

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Here's an earlier discussion to add.
 
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SVD

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Agree with speed signs being a rather unreliable frame of reference. In the winter, they don't get much sunlight where I am, and their emission range is noticeable weaker. After a week of no sun, these speed signs don't even show your speed, sometimes with detectable radar, sometimes they are totally dead.
 

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