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Two-Tone decode programming NX200

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iceman977th

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Trying to program two-tone decoding on my NX200. I have two sets of tones that I want to program. One is 903.2/553.9, and the other is 810.2/903.2. First tone is programmed to A/B, the other is programmed to C/D. First tone will decode without a problem, and during the pager test the second set is usually right after the first set, but it will not activate on the second set of tones at all. Is there something I'm missing?
 

ramal121

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I'm concerned about the 903.2 tone. In one set it is the A tone and in the other set the B tone. Depending how the tones are sent out, the radio may run the 903.2 decode together thinking it's one long tone. You could put the single tone sets into individual channels to test each one separately. I suspect that would work fine.

Let me get to my software to see if there are any timing parameters you could diddle with.
 

iceman977th

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I'm concerned about the 903.2 tone. In one set it is the A tone and in the other set the B tone. Depending how the tones are sent out, the radio may run the 903.2 decode together thinking it's one long tone. You could put the single tone sets into individual channels to test each one separately. I suspect that would work fine.

Let me get to my software to see if there are any timing parameters you could diddle with.
Here are the decode parameters I have set up right now. I never thought about that.
 

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ramal121

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Well you piqued my interest and had to try it myself. I programmed my NX200 to your 2tone settings and set the radio off with my service monitor. For the tone sets I used the standard 1second/3 second timing and started with a 3 second gap time between sets. No problem decoding either. Swapped tone sets for encoding and still both alerted. I reduced the gap time between tone sets a few times until I got to zero. All four tones went out mashed together and the radio could still decode both, even when the set were swapped again. Played with the auto reset timer, switched the decode sequence to A-B/C-A, swapped tones around still all good.

The only time I could get the second set of tones to fail was with the gap time at zero and I changed the alert tone timing so both were very long slow baaleeeps of several seconds. Encoding A-B/C-D to the radio worked but C-D/A-B did not. Increasing the gap time to 50ms then both worked fine.

So to me it looks like the NX200 can decode a 2tone just about any which way it comes out. Starting to think there may be problems on the way it comes across on the radio. Wide/narrow issue? Tone volume (deviation) too high or too low? I know you're probably entering tones off of a list but are these the true tones or maybe a little off (tones vary from encoder to encoder)?

I guess, again, you could put different A-B sets in two different channels to see if they will decode all by themselves. Sorry but not finding much here at my end.
 

iceman977th

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Well you piqued my interest and had to try it myself. I programmed my NX200 to your 2tone settings and set the radio off with my service monitor. For the tone sets I used the standard 1second/3 second timing and started with a 3 second gap time between sets. No problem decoding either. Swapped tone sets for encoding and still both alerted. I reduced the gap time between tone sets a few times until I got to zero. All four tones went out mashed together and the radio could still decode both, even when the set were swapped again. Played with the auto reset timer, switched the decode sequence to A-B/C-A, swapped tones around still all good.

The only time I could get the second set of tones to fail was with the gap time at zero and I changed the alert tone timing so both were very long slow baaleeeps of several seconds. Encoding A-B/C-D to the radio worked but C-D/A-B did not. Increasing the gap time to 50ms then both worked fine.

So to me it looks like the NX200 can decode a 2tone just about any which way it comes out. Starting to think there may be problems on the way it comes across on the radio. Wide/narrow issue? Tone volume (deviation) too high or too low? I know you're probably entering tones off of a list but are these the true tones or maybe a little off (tones vary from encoder to encoder)?

I guess, again, you could put different A-B sets in two different channels to see if they will decode all by themselves. Sorry but not finding much here at my end.
That's weird, because A/B works fine. When they do the nightly tone test, A/B tone is the 3rd tone, then the C/D tone is the 4th tone. It never activates, even with a second of spacing.
 
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