NR DSP reporting different frequency than standard NR

Discussion in 'NetRadar' started by Pete78, Jan 12, 2018.

  1. Pete78

    Pete78 Premium Member Beginner User Premium Member

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    In my experience, and I've seen others mention it as well, the new DSP reports frequencies that match other high end detectors. For instance, the NR DSP mounted to the front of my car routinely reports the same frequencies as my R3. The (possible) problem I might be seeing is that my rear standard NR antenna reports a slightly different frequency. I'm not sure if this causes issues with threat direction indicators (arrows) in ALPConnect or not. I assume there is some sort of tolerance the app uses to determine direction when the frequencies are a bit off. I know about the doppler effect, and this is not it. I can duplicate the results just by turning my car around in a parking lot using the automatic door radar. Would upgrading my rear antenna to a DSP result in a better performing system?
     
  2. smokinu454

    smokinu454 county road cruisin Advanced User

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    How different are we talking 24.150 vs 24.155 or something more extreme?
     
  3. TurboDriver

    TurboDriver PSL + 50, every now and then Advanced User Premium Member

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    I would think it has more to do with signal strength than frequency. (as far as the arrows)

    The original NR always had an off frequency for me, K was about 20-30 high, Ka 35.5 was closer to 100 low, and 34.7 varied a little.
     
    Last edited: Jan 12, 2018
  4. Pete78

    Pete78 Premium Member Beginner User Premium Member

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    24.165 (front dsp) vs 24.182 (rear standard)

    Another test with a parked police car that left his radar on:

    34.183 front vs 34.840 rear

    Is this anything to worry about?
     
    Last edited: Jan 12, 2018
  5. BestRadarDetectors

    BestRadarDetectors Premium Member Advanced User MFG/Vendor Premium Member

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    DSP antennas will be much more accurate. The older Analog NR will always have a +/- variation.

    Sent from my SM-G955U using Tapatalk
     
  6. Pete78

    Pete78 Premium Member Beginner User Premium Member

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    That's understandable. Does the frequency difference between front and rear antennas affect the behavior of the controller? For instance does it slow down the functioning of the arrows or does it cause multiple bogies to be displayed when it's really a single source? Sometimes driving through a static checkpoint with a Ka radar to check approaching vehicle speed my system goes nuts and shows five or more sources of Ka...
     
  7. BestRadarDetectors

    BestRadarDetectors Premium Member Advanced User MFG/Vendor Premium Member

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    Frequency has nothing to do with arrows, Direction is controlled by strength and there will always be a lag if using a stronger antenna in the front because it will hold the signal longer as you pass before the rear antenna takes over. In the future we may compensate for it depending on how many run this mixed configuration. We have been surprised that over 90% of new purchases so far users are going with dual DSP's..
     
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  8. G37X Jockey

    G37X Jockey Premium Member Intermediate User Premium Member

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    After decades of V1 use, I can attest that rear detections are long duration, slow approach situations with plenty of warning. My DSP is front mounted with a std. NR facing rear which I am confident will be more than adequate. I think a DSP facing rear could become annoying actually.

    Posted from my SM-A520W using the RDF Mobile App!
     
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  9. nicholat

    nicholat Premium Member Advanced User Premium Member

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    Have not installed my front facing DSP unit yet, but most of my BSM false alerts come from the rear. Most of the these false alerts are coming from car going in the opposite direction of my travel.
     
  10. G37X Jockey

    G37X Jockey Premium Member Intermediate User Premium Member

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    Interesting. If the DSP has better BSM filtering then there could be an advantage to having 2 front and rear after all for that reason alone. Looking forward to hearing about people's experiences. For the time being I've spent enough money .

    Posted from my SM-A520W using the RDF Mobile App!
     
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  11. Frankrizzo

    Frankrizzo Learning to Drive General User

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    If I were starting from scratch I’d go dual dsp for the on spec frequencies and a standardized setup alone. Eventually though I’ll end up just upgrading the front.
     
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  12. jakevsnake

    jakevsnake Premium Member Intermediate User Premium Member

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    I am surprised to hear that 90% number myself. It makes me wonder what I could be missing by having just one DSP in the front and a NR in the rear. As people get further into testing both configurations that will determine whether I plan to replace my NR or not.
     
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  13. G37X Jockey

    G37X Jockey Premium Member Intermediate User Premium Member

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    I have the DSP up front and NR out back, and the arrows seem quite accurate. I really don't think a rear DSP will give me any practical advantage.
     
  14. jakevsnake

    jakevsnake Premium Member Intermediate User Premium Member

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    Thats good to know. Hopefully we will get a bigger consensus as time passes.
     
  15. TurboDriver

    TurboDriver PSL + 50, every now and then Advanced User Premium Member

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    I agree and so far I am happy with the NR-O pointing out back and is plenty sensitive. The rear threats aren't needing extreme range to be countered and the arrows (curved lines actually) seem to work well and accurate so far. I think extreme range on the rear would be more of an annoyance than practical. The NR-O did a great job when I had it for front detection's so rear should be just fine.
     
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  16. G37X Jockey

    G37X Jockey Premium Member Intermediate User Premium Member

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    I tend to agree TurboDriver. I've run several V1's for many years, and rear detections always have a slow closing speed so plenty of reaction time - usually measured in minutes. A rear DSP instead of an analog unit would just be a nuisance.
     
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  17. jakevsnake

    jakevsnake Premium Member Intermediate User Premium Member

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    I wasnt concerned so much about range with just having a NR in the rear as I was with BSM filtering. If the DSP is better at filtering I may go with a DSP in the rear sometime in the future. I cant stand false alerts :)
     
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  18. Deacon

    Deacon TXCTG Advanced User Premium Member

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    Especially if you can selectively dial down the sensitivity separately per band per antenna, like you could with forward and rearward facing R3’s. Does the ALP/NR config allow for that?
     
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  19. nicholat

    nicholat Premium Member Advanced User Premium Member

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    The Net radar allow 2 different city mode settings for x and k band. You can change # of bar before alerting. Currently you are not able to set them differently between front and rear antenna. What you can do is Seg both front and back antenna's differently. So I run my K band wide in front and Narrow in the rear.

    @Deacon
     
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  20. G37X Jockey

    G37X Jockey Premium Member Intermediate User Premium Member

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    My NR setup page does allow for independent front and rear antenna alert/bar settings in City modes, but not Hwy mode.
     

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