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Nexedge Gen 2 Issues

km4lkx

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Aug 19, 2019
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Hello Everyone,
I am the Radio Systems Administrator for an SMR Service in my area. We currently have 31 sites that are running Gen 2. We have been experiencing a myriad of issues with the Gen 2 system. So much so that we are considering reverting all our sites back to Gen 1 as our coverage area has shrank considerably and customers are not happy. I have noticed that when observing the symbol decode for a local control channel, one of the symbols is off by about 5%-10%. This is true for every NXR-5800 we have tested. The process for tuning these repeaters in no small task, especially considering the number we currently have deployed...

We have a Gen1 and Gen2 control channel co-located at the same site, fed into the same combiner and antenna. (All of which is new and factory tuned by TX/RX Systems) I ran a test to see what the fringe RSSI is. Please see the attached photo for the comparison. This test was ran on two good mobile antennas of the same gain and location on the vehicle. Has anyone else ran into this issue with Gen2?
 

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TampaTyron

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Feb 1, 2010
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I would be very surprised. Kenwood makes really good stuff and takes things like this very seriously. I am sure they will get you squared away. Please keep us informed. TT
 

KevinC

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Somewhere other than home :(
I'm not Kenwood-wise so these are not manufacturer specific questions. Have you measured the power out of the combiner for both channels to see if they are equal? Have you moved your vehicle a little to see if the imbalance stays the same or flip-flops? Have you swapped antennas on the two mobiles to make sure the imbalance doesn't follow the antenna?
 

km4lkx

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RF side of things is good. Combiner was factory tuned by TX/RX systems for the frequencies used. When I check the cans with my service monitor, I get the expected isolation at each can.

I have swapped the two mobile antennas.

I have driven around and the delta between the two systems’ RSSI in the fringe is persistent.
 

Reelfishguy

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May 30, 2011
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It does not make sense that if you are getting the same power from each transmitter at the top of the combiner stack, that you have that much variation with the RSSI for each transmitter.
 

TampaTyron

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Factory tuned doesnt mean much to me as I deal with factory mistuned combining and filtering several times a month. That being said, have you measured the power coming out of the combiner on all system transmit frequencies? TT
 

mmckenna

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Please see the attached photo for the comparison. This test was ran on two good mobile antennas of the same gain and location on the vehicle.
I'm only running a Gen 1 system, so I have no input on the Gen1 vs. Gen 2 side of this, but I doubt that is causing the RF issues.


I didn't see this mentioned anywhere, but have you tried switching radios? I mean specifically, put the Gen 2 system on the NX-800 and the Gen 1 system on the NX-5800 to see if the issue follows the radio or the system.
 
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