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Nexedge - NX-700 Signal Strength

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kc0bqb

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Is there a way to log signal strength from the NX-700 through the com port? We are trying to do some testing/logging on the coverage area of the trunking repeater.


Thanks,
Josh
kc0bqb
 

kd4efm

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I will have to do some digging, but I don't think so. If you sign up on radio mobile aka towercoverage.com google radio mobile online. I can get within two to five miles accurate coverage.

What system or where if I may ask?

kd4efm Evans, sent using TapTALK on my HTC M9
 

ramal121

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For a NX mobile I think the best you can do is set the "maintenance" function to either the menu or a button. Gives a pretty accurate reading in dBm on the display, but you'll need a pencil and paper.
 

kc0bqb

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Will any of the NX-X00 radios output the received signal strength through the com port?
 

mmckenna

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All the NX-x00 radios use the same firmware, so the functions are nearly identical, other than the obvious.

Would an RSSI pin on the circuit board be useful, or do you need an actual data output?
 

mmckenna

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Is there a way to log signal strength from the NX-700 through the com port? We are trying to do some testing/logging on the coverage area of the trunking repeater.


Thanks,
Josh
kc0bqb

I spent some time scrubbing through a few of the manuals and the only things useful I can find are that you can plug a radio into the KPG-111 software and then activate "Test Mode" on the radio. There is a window there that will give you RSSI and VCO lock voltages. You'd have to set up one of the test frequencies to match that of your system, but that still doesn't give you a way to log it, but at least it's a way to get the RSSI out of the radio.

And, there's the RSSI pin on the circuit board. Might take some outboard gear, but you could log that.
 

kc0bqb

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Yes! a RSSI pin would work. I can use an ADC to poll the pin. I am already grabbing data from the GPS.
 

mmckenna

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RSSI is on pin 15 of the IF IC "IC202".

You might want to check pin 1 on the rear DB25. The manual says "NC", but when I look at the schematic, it says NC/RSSI and there seems to be a connection.
 

ramal121

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I mapped out the analog RSSI for a TKR 810 repeater. Spec said 0 to 3.3 volts on the spread. I found it to be in the range of 1 to 3.5 volts and slightly non-linear.

Once you collect the data, you'll have to step through the receiver with a signal generator to translate to a signal level with a good voltmeter. I suspect all radios are slightly different so check the radio you made the tests with.

Yeah I can see this very doable with one of those cheapo USB A to D data loggers.

Sent from my SM-T560NU using Tapatalk
 
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