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QC II Issues - XTL & XTS5000

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Happy new year all!

I am on a regional fire dispatch system in New Hampshire (Lakes Region Mutual Fire Aid). The network operates a simplex simulcast system with Several towers on mountain tops across the region.

Lakes Region uses QC II (or perhaps some other iteration of the two-tone analog paging system) to dispatch individual towns with some having multiple sets of tones depending on the call. Fortunately, my town only has 1 set of tones for all calls:

A) 1357.0
B) 764.6

My Uniden scanner properly trips every time These tones come through the dispatch channel. Furthermore, the computer program called two-tone detect also seems to be working properly. But, neither my XTS nor XTL5000 ever alert in either the and setting or the or setting for these or any other tones that come from dispatch.

Making the situation even more confusing, when I use one radio to key the same tones on a separate frequency for testing purposes, the other radio does alert properly, along with the uniden scanner. Issues alerting for the XTL & XTS only arise when the tones come from dispatch but the uniden scanner’s performance is exactly the same in all scenarios.

After reading other threads, it seems that this is not an uncommon issue, and furthermore, it seems that our community has collectively not been able to solve it yet.

Im hoping perhaps others who have had this issue might be able to share and discuss what they have done to try and address it, andfolks who have been able to successfully work with QCII might be able to share their expertise and insights.

I’m sure there is something silly I am missing in the CPS, and hopefully someone will be able to call me out on it!

Thanks!
 

KevinC

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You mention it’s simulcast, is your digital modulator set to CQPSK?

Assuming it’s P25. It probably isn’t, so never mind. :p
 
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Maybe check pre-emphasis/de-emphasis to be sure it matches what the system uses?
To be honest, I’m not really sure what pre/de emphasis is or how to determine what the system uses. Any advice as to how to figure this out?
 

Tech21

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To be honest, I’m not really sure what pre/de emphasis is or how to determine what the system uses. Any advice as to how to figure this out?
If your radio shop has any idea what they are doing, "pre and de" is turned on in subscribers.
 

n3obl

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Maybe double check your tones. The scanner might be decoding it off freq. Commerical radio is not as tolerate and needs to be spot on
 
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Maybe double check your tones. The scanner might be decoding it off freq. Commerical radio is not as tolerate and needs to be spot on
I think you are right- I’m moving the tone settings to the nearest standard QC II tones. The scanner set to the old tones and the other radio set to the old tones still trips at close range but not when further away.

Hopefully this was the issue!

As far as pre/de emphasis goes- I’m not able to find anything in the CPS. Just “RX Emphasis” and “TX Emphasis”.

Does anyone know which field it is under?
 
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Still not working- I think there’s something else. Confirmed the Tones are accurate and are:

A) 1357.6
B) 767.4

I’m not sure if there is something else I am missing because the PL code is also accurate (210.7).

There really isn’t much static at all either so I don’t think there is distortion.
 
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The audio on the portables picks up perfectly with the PL on? Would that mean that they aren’t broadcasting the tones CSQ?
 

nhfirefighter

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Tones for LRMFA are broadcast with PL, so that isn’t the problem. If your tone codes are spot on then it is probably in the call alert decode settings. As another poster noted the radios are less forgiving than the scanners. You need to make sure the tone codes you are entering is exactly same as the tones generated from the console in dispatch. If you work for the fire department you should be able to get the exact codes from a department officer.
 
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Tones for LRMFA are broadcast with PL, so that isn’t the problem. If your tone codes are spot on then it is probably in the call alert decode settings. As another poster noted the radios are less forgiving than the scanners. You need to make sure the tone codes you are entering is exactly same as the tones generated from the console in dispatch. If you work for the fire department you should be able to get the exact codes from a department officer.
Thanks! Confirmed today that the tones are exact so I think it’s something else in the settings.
 

AM909

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Can you record and post a transmission from dispatch? Maybe their timing is off?
 

wa8pyr

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Still not working- I think there’s something else. Confirmed the Tones are accurate and are:

A) 1357.6
B) 767.4

I’m not sure if there is something else I am missing because the PL code is also accurate (210.7).

There really isn’t much static at all either so I don’t think there is distortion.

Try creating a separate personality with the paging frequency set to receive only, and carrier squelch only, and set it up in whatever zone you want as a separate paging channel. I've had issues in the past on both Motorola and Harris radios where the decode didn't work quite right with PL on the receive frequency; once I dropped that and went to carrier squelch for the paging channel only, all was well.
 
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