DSDPlus Xpt system - no control channel

[htidliam]

I have a local XPT system, I believe XPT systems have no control channel.

How can i trunk this in dsd+ fast lane without a control channel being available?

 

[RayAir]

I have a local XPT system, I believe XPT systems have no control channel.

How can i trunk this in dsd+ fast lane without a control channel being available?

I have one local xpt system and it is similar to Capacity Plus.
If it is using pseudo trunk that is a bit different animal.
Are you sure it is xpt?

 

[htidliam]

Hello,

Dsd+ shows XPT

And my scanner shows it as XPT.

So I’m positive it’s XPT, there’s only 2 x frequencies in use. But no control channel.

So I’m struggling to how I can follow it

 

[dave3825]

If its only 2 freqs, have you tried the FMP24 scan list?

; FMP24 Scan List
; ---------------
;
; Entries in this file are scanned when the 'S' key is pressed in FMP24
;
; Press Esc in FMP24 to exit scanner mode
;
; Lines with leading semicolons are ignored.
; Use a leading semicolon to "lock out" an entry.
; Use a leading semicolon to add comments/documentation.
;
; File processing stops if a line containing "<EOF>" is found.
; Entries after the <EOF> line are not processed.
;
;
; Line format:
;
; frequency options description
;
;
; Frequency is specified in MHz
;
;
; Options:
;
; Modulation Specifier
;
; 4 kHz bandwidth digital protocol specifiers:
;
; iDAS
; NX48
; NXDN48
; NEXEDGE48
;
; 7.6 kHz bandwidth digital protocol specifiers:
;
; Dstar
; D-Star
; DMR
; TRBO
; Cap+
; Con+
; TIII
; XPT
;
; 9.5 kHz bandwidth digital protocol specifiers:
;
; Fusion
; NX96
; NXDN96
; NEXEDGE96
; P25
;
; 12.5 kHz bandwidth digital protocol specifiers:
;
; PV
; ProVoice
;
; Analog modulation specifiers:
;
; AM (AM demodulation for airband)
;
; Anything else, such as "FM" or "Analog" or nothing
; is assumed to be FM modulated analog and defaults to 12.5 kHz bandwidth
;
;
; Bandwidth Specifier
;
; Overrides default bandwidth
;
; Format: BW=<kHz>
;
; Valid bandwidth values are 4, 7.6, 9.5, 12.5 and 22
;
;
; Delay Specifier
;
; Keeps FMP24 on a channel / delays resumption of scanning
; for the specified amount of time after a valid signal ends
;
; Format: DELAY=<seconds>
;
;
; Description
;
; User-supplied channel name/description
;
;
; Sample scan list:

118.3 AM BW=12.5 DELAY=2.5 Miami Tower

145.17 DMR DELAY=1.5 N2GKG

162.4 FM WX

454.35 NX48 Acme Inc.

163.8125 P25 BW=12.5 DELAY=5 Feds

<EOF>

 

[Forts]

XPT is very similar to Capacity Plus. There will be bursts of data periodically as needed. I'd presume it would program the same way as Cap+... set it up as a networked system with an arbitrarily assigned network ID.

 

[RayAir]

Maybe it's just using pseudo trunk and dsd flags it as xpt? If you have all the frequencies in use and can't find a beacon I'd bet it's pseudo trunk.

From Hytera DMR planner-

Pseudo Trunk is one of the Hytera patents. Generally, in Repeater mode, DMR standard protocol
defines radios to transmit in the fixed slot. If the slot is occupied, the radio has to wait for it instead of
another free slot, wasting the frequency band resources. However, the Pseudo Trunk feature allows
two different calls to be made simultaneously in Direct mode, as well as the dynamic slot distribution
in Repeater mode. This brings great convenience and efficiency to the communications

 

[R0am3r]

@htidliam - If DSDPlus Fastlane and your scanner shows XPT, it is likely XPT. As @dave3825 suggested, try using the DSDPlus Scan List. A casino near me has a four frequency XPT system, so I have the option of using a Scan List or I can assign multiple SDRs (and multiple instances of DSDPlus FL) to monitor the four frequencies.

The Uniden SDS series scanners will also work with XPT systems, but you may want to configure them differently. If you need help with this, please ask.