SDS100/SDS200: Uniden SDS100 close call feature DMR/NXDN

[wsp44]

I recently purchased a SDS100 and while testing some DMR/NXDN radios I noticed that it wouldn't close call analyze them. The close call feature works great for analog, and p25 conventional (I haven't tried to see if it will close call p25 trunking) but after doing a little digging and contacting bearcat warehouse, the guys over there informed me that that the SDS was unable to close call DMR or NXDN. Surely I'm not the only out there would love to have this feature. I understand that DMR, NXDN, and EDACS are not standard features in the SDS100 and that is probably why you can't close call those protocol, but hopefully this is something that Uniden is looking into.

 

[KevinC]

I see no reason for it to not hit on NXDN, mine does. As far as DMR goes it will hit on the repeater side but not the mobile/subscriber side due to the short duration of the on of the on/off TX cyc

 

[dave3825]

Do you have the NXDN and DMR upgrades installed in the radio? I had asked about the sds 200 displaying the protocol it was on during searches and believe was told it would only work if the upgrades were in place. That may be the same with close call.

 

[Whiskey3JMC]

Close call certainly doesn't discriminate voice mode. Are you certain the proper band(s) is (are) turned on for what you're trying to get a close call hit on?

Set CC Bands lets you select the Close Call bands to be searched.

Scroll to each Band and press E/yes to toggle On or Off. Press Menu to return.

but after doing a little digging and contacting bearcat warehouse, the guys over there informed me that that the SDS was unable to close call DMR or NXDN.

Partially false. There have been documented issues on the forums getting CC hits from DMR (& I guess NXDN?) simplex but repeated operations you shouldn't really have an issue

 

[wsp44]

I should have specified that it wouldn't CC DMR simplex.

DMR simplex doesn't CC, NXDN simplex DOES CC

 

[wsp44]

Do you have the NXDN and DMR upgrades installed in the radio? I had asked about the sds 200 displaying the protocol it was on during searches and believe was told it would only work if the upgrades were in place. That may be the same with close call.

Both upgrades are enabled, my first thought was that maybe they weren't enabled.

 

[KevinC]

I should have specified that it wouldn't CC DMR simplex.

DMR simplex doesn't CC, NXDN simplex DOES CC

You are correct, it won't CC DMR simplex. The duration of the TX signal is too short for CC to detect it. A matter of physics.

 

[RRR]

If it can't detect half the timeslot, then how can it truly be able to decode TDMA?

 

[62Truck]

If it can't detect half the timeslot, then how can it truly be able to decode TDMA?

Because the repeater will transmit both slots at the same time whether if there is activity on the other slot or not

 

[RRR]

Ok, so then they technically can't monitor TDMA then, if the full 12.5 "slot" has to be keyed up

 

[62Truck]

We are talking about close call and DMR simplex, my 436 seems to decode simplex DMR fine

 

[racingfan360]

Decoding a DMR simplex/repeater input and detecting the same signal using Close Call are not the same thing. An SDS100 will decode a DMR simplex/repeater input TDMA signal just fine But the technology behind how Close Call works means that it will never be able to reliably detect a DMR simplex signal. It relies on comparing multiple short samples. It needs a signal with a duration of greater than 30msec (don't recall the exact minimum duration, I'm sure someone else will).

 

[Ubbe]

It needs a signal with a duration of greater than 30msec (don't recall the exact minimum duration, I'm sure someone else will).

It's much longer. Something like 3 samples of 200mS each that totals 0,6 sec.

/Ubbe

 

[jeremym70]

On an unrelated but similar note, in this area we have a NXDN 454 MHz trunked system with 6.25KHz splits. Using a custom search band with my 325P2, 996P2 or SDS scanners I cannot lock on any control or voice channels. However if I manually step through the freqs while in search mode I can hear and decode them. I have adjusted digital waiting time with no luck.
Any ideas?

 

[KevinC]

On an unrelated but similar note, in this area we have a NXDN 454 MHz trunked system with 6.25KHz splits. Using a custom search band with my 325P2, 996P2 or SDS scanners I cannot lock on any control or voice channels. However if I manually step through the freqs while in search mode I can hear and decode them. I have adjusted digital waiting time with no luck.
Any ideas?

Check your Broadcast Screen for pagers.

 

[Ubbe]

On an unrelated but similar note, in this area we have a NXDN 454 MHz trunked system with 6.25KHz splits. Using a custom search band with my 325P2, 996P2 or SDS scanners I cannot lock on any control or voice channels. However if I manually step through the freqs while in search mode I can hear and decode them. I have adjusted digital waiting time with no luck.
Any ideas?

Digital Waiting Time are only a speaker audio mute function so that you do not need to listen to the data signal while it is trying to decode it and switch to digital mode. It doesn't do anything to the decode function.

Set the digital wait time to 0 so you will be able to hear the same thing as the scanner hear. But if it doesn't even stop the search then it has to be what KevinC suggests, that the Broadcast Screen are blocking the frequency during search mode. When you tick a box in the Broadcast Screen setting it will block that frequency range and exclude it from being detected in search and close call.

/Ubbe

 

[jeremym70]

Thanks both of you, it now works on my 996P2 and SDS.