Master Control Talkgroups

 

Master Control Talkgroups or MCT's are special talkgroups (group calls) that will override the default or normal settings and timers of most or possibly all talkgroups on a given manager's timeslot.  MCT's provide a semiautomatic method to keep other talkgroups from barging into an active conversation or hijacking a QSO on a different talkgroup.  They may control 1 timeslot or both timeslots. See the PowerPoint PDF.

TIP:  If you wish to turn off a TS 2 talkgroup(s), you do not need to wait for an opening, just Ker-Chunk as you are TX'ing onto TS1, not nearly as busy as TS 2 (if TS 1 is busy, you will get bonked of course).  Sort your zones so that the MCT's are in the middle to cut down on the thumbing or place MCT off in multiple places in your zone (beginning, middle and end; 3 times)

Up to 4 channels may be needed to control both timeslots to make use of the power of the MCT method of talkgroup control.  If your radio is limited to 16 channels per zone, you may wish to add a second or third zone for a particular repeater to make room for the MCT's as well as the additional talkgroups that are supported on the PNWDigital.Net repeater managers (the c-Bridge).

NOTE: Want to keep this simple?  Local 1 (for timeslot 1) and Local 2 (for timeslot 2) will also have the same "control off" capabilities but for the shorter off time of 5 minutes and only on their own timeslots.  This is the quick and dirty network silencer for either timeslot. 

If the repeater is not listed, you can decode the correct settings as follows; 1st 4 digits are the same, 5 digit is 1 for On or 2 for Off, 6th and 7th digits are the manager/slot combo number and 8th digit is 1 for TS1 or 2 for TS2.  TX is always on TS1 for ALL MCT's.

Decoding the correct TGID's are as follows; 1st 4 digits are:1677 and are fixed, 5th digit is 1 for On or 0 (zero)  for Off, 6th and 7th digits are the manager/slot combo number and 8th digit is 1 for a TS1 TG or 2 for a TS2 TG.  TX is always on TS1 for ALL MCT's.

 
Bremerton  --  PNW-A c-Bridge Managers  -  pnw-a.pnwdigital.net
Manager IPSC Network Manager Status / Notes TS 1 On TS 1 Off TS2 On TS2 Off
01  01-02     16771011 16770011 16771022 16770022
02  03-04     16771031 16770031 16771042 16770042
03  05-06 Ariel - Ariel still on Baw Faw 16771051 16770051 16771062 16770062
04  07-08 Snoqualmie - Rattlesnake Mtn   16771071 16770071 16771082 16770082
05  09-10     16771091 16770091 16771102 16770102
06  11-12 Mazama - Fawn Creek   16771111 16770111 16771122 16770122
07  13-14     16771131 16770131 16771142 16770142
08  15-16   Local 16771151 16770151 16771162 16770162
09  17-18 Whidbey Island - Whidbey   16771171 16770171 16771182 16770182
10  19-20 Seattle - Cougar also Metro 16771191 16770191 16771202 16770202
11  21-22     16771211 16770211 16771222 16770222
12  23-24 Seattle; Cougar, E Tiger All hold-offs & MCT's 16771231 16770231 16771242 16770242
13  25-26 Spokane (moving to E) All hold-offs & MCT's 16771251 16770251 16771262 16770262
14  27-28 Tacoma - Baldi Mtn   16771271 16770271 16771282 16770282
15  29-30 Tacoma - Ruston   16771291 16770291 16771302 16770302
16  31-32 N7MOT   16771311 16770311 16771322 16770322
17  33-34 Sequim - Blyn Mtn   16771331 16770331 16771342 16770342
18  35-36 North Bend - Valley Camp   16771351 16770351 16771362 16770362
19  37-38     16771371 16770371 16771382 16770382
20  39-40 Snoqualmie   16771391 16770391 16771402 16770402
21  41-42 NO7RF   16771411 16770411 16771422 16770422
22  43-44     16771431 16770431 16771442 16770442
23  45-46     16771451 16770451 16771462 16770462
24  47-48 Bellingham VHF - Lookout   16771471 16770471 16771482 16770482
25  49-50 Shelton - Shelton   16771491 16770491 16771502 16770502
26  51-52 Oso - Frailey   16771511 16770511 16771522 16770522
27  53-54     16771531 16770531 16771542 16770542
28  55-56     16771551 16770551 16771562 16770562
29  57-58 900 Mhz - Baldi soon 16771571 16770571 16771582 16770582
30  59-60 Olympia - Capital Peak   16771591 16770591 16771602 16770602
31  61-62 Oregon - Salem N7MAQ 16771611 16770611 16771622 16770622
32  63-64 Seattle South - Kubota   16771631 16770631 16771642 16770642
33  65-66     16771651 16770651 16771662 16770662
34  67-68 GAFS Test Manager 16771671 16770671 16771682 16770682
35  69-70 NW WA UHF - Bellingham Lookout Mtn UHF 16771691 16770691 16771702 16770702
36  71-72 Kelso / Longview   16771711 16770711 16771722 16770722
37  73-74 Seattle - Metro on Gold currently 16771731 16770731 16771742 16770742
38  75-76 Bremerton - Gold Mtn - Seattle Metro   16771751 16770751 16771762 16770762
39  77-78 WA SW Boistfort - Baw Faw - Ariel   16771771 16770771 16771782 16770782
40  79-80 Wenatchee moving to PNW-E 16771791 16770791 16771802 16770802
41  81-82     16771811 16770811 16771822 16770822
42  83-84     16771831 16770831 16771842 16770842
43  85-86 Yakima moving to PNW-E 16771851 16770851 16771862 16770862
44  87-88     16771871 16770871 16771882 16770882
45  89-90     16771891 16770891 16771902 16770902
46  91-92     16771911 16770911 16771922 16770922
47  93-94 Seattle DMR - Link Link 16771931 16770931 16771942 16770942
48  95-96     16771951 16770951 16771962 16770962
49  97-98     16771971 16770971 16771982 16770982
50  99-100     16771991 16770991 16771002 16770002
NOTE:  References are to repeater managers, not repeaters directly, though they may be listed for additional clarity.
ALL MCT's must TX on timeslot 1
, do not TX on timeslot 2, even though the MCT may control timeslot 2 talkgroups
Local 1 & 2 can be used as shorter MCT Off controls, so the additional MCT talkgroups may not needed in all user zones.
 
Kennewick  --  PNW-D c-Bridge Managers  -  pnw-d.pnwdigital.net
Manager IPSC Network Status / Notes TS 1 On TS 1 Off TS2 On TS2 Off
01  01-02     16771011 16770111 16771022 16770022
02  03-04     16771031 16770031 16771042 16770042
03  05-06     16771051 16770051 16771062 16770062
04  07-08     16771071 16770071 16771082 16770082
05  09-10     16771091 16770091 16771102 16770102
06  11-12 Boardman - Golgatha   1677111 16770111 16771122 16770122
07  13-14 Hood River - Burdoin Mtn   16771131 16770131 16771142 16770142
08  15-16   Local 16771151 16770151 16771162 16770162
09  17-18 Everson - Everson   16771171 16770171 16771182 16770182
10  19-20 Cascade Locks - Cascades Locks Hill   16771191 16770191 16771202 16770202
11  21-22 Biggs Junction - Juniper Point I-84 Group 16771211 16770211 16771222 16770222
12  23-24 The Dalles - Stacker Ridge I-84 Group 16771231 16770231 16771242 16770242
13  25-26 Portland - Westhills I-84 Group / AARG 16771251 16770251 16771262 16770262
14  27-28 Portland / Lookout Pt I-84 Group 16771271 16770271 16771282 16770282
15  29-30 Gresham / Hospital I-84 Group 16771291 16770291 16771302 16770302
16  31-32 Portland / Mt Scott KA7AGH 16771311 16770311 16771322 16770322
17  33-34 IPSC Demo - Test Statewides FT 16771331 16770331 16771342 16770342
18  35-36 Portland - PPMC   16771351 16770351 16771362 16770362
19  37-38     16771371 16770371 16771382 16770382
20  39-40     16771391 16770391 16771402 16770402
21  41-42     16771411 16770411 16771422 16770422
22  43-44 Megler- Megler   16771431 16770431 16771442 16770442
23  45-46     16771451 16770451 16771462 16770462
24  47-48 Yakima - Elephant Mtn still on PNW-A 16771471 16770471 16771482 16770482
25  49-50 MMDVM - Rex 2 slot 16771491 16770491 16771502 16770502
26  51-52 Polly-Audio Test   16771511 16770511 16771522 16770522
27  53-54 MMDVM - Wes Single slot only 16771531 16770531    
28  55-56     16771551 16770551 16771562 16770562
29  57-58 Tri-Cities - Jump Off Joe UHF   16771571 16770571 16771582 16770582
30  59-60 Tri-Cities - Jump Off Joe VHF   16771591 16770591 16771602 16770602
31  61-62 KC7AAD   16771611 16770611 16771622 16770622
32  63-64     16771631 16770631 16771642 16770642
33  65-66 Prineville - Prineville   16771651 16770651 16771662 16770662
34  67-68     16771671 16770671 16771682 16770682
35  69-70     16771691 16770691 16771702 16770702
36  71-72     16771711 16770711 16771722 16770722
37  73-74     16771731 16770731 16771742 16770742
38  75-76     16771751 16770751 16771762 16770762
39  77-78     16771771 16770771 16771782 16770782
40  79-80     16771791 16770791 16771802 16770802
41  81-82 MMDVM - Rpi - TestBed poss: EMMA 16771811 16770811 16771822 16770822
42  83-84 MMDVM - Peter   16771831 16770831 16771842 16770842
43  85-86     16771851 16770851 16771862 16770862
44  87-88     16771871 16770871 16771882 16770882
45  89-90 IPSC-MMDVM - Test PTT Only 16771891 16770891 16771902 16770902
46  91-92 ISPC-MM-Open - Test   16771911 16770911 16771922 16770922
47  93-94 MMCVM - Otis   16771931 16770931 16771942 16770942
48  95-96 IPSC-MMDVM WB7AWL 16771951 16770951 16771962 16770962
49  97 MMDVM - Bridget Single slot only 16771971 16770971    
50  99 MMDVM - Suzy Single slot only 16771991 16770991    
NOTE:  References are to repeater managers, not repeaters directly, though they may be listed for additional clarity.
ALL MCT's must TX on timeslot 1
, do not TX on timeslot 2, even though the MCT may control timeslot 2 talkgroups
Local 1 & 2 can be used as shorter MCT Off controls, so the additional MCT talkgroups may not needed in all user zones.
 
Spokane  --  PNW-E c-Bridge Managers  -  pnw-e.pnwdigital.net
Manager IPSC Network Manager Status / Notes TS 1 On TS 1 Off TS2 On TS2 Off
01  01-02     16771011 16770111 16771022 16770022
02  03-04 Allentown PA DCI 16771031 16770031 16771042 16770042
03  05-06     16771051 16770051 16771062 16770062
04  07-08     16771071 16770071 16771082 16770082
05  09-10     16771091 16770091 16771102 16770102
06  11-12 Mazama VHF still on PNW-A 1677111 16770111 16771122 16770122
07  13-14     16771131 16770131 16771142 16770142
08  15-16 Aiken SC DCI 16771151 16770151 16771162 16770162
09  17-18 Pateros - Goat Mtn   16771171 16770171 16771182 16770182
10  19-20 Wenatchee - Little Badger still on PNW-A 16771191 16770191 16771202 16770202
11  21-22 Ellensburg - Sun East UHF   16771211 16770211 16771222 16770222
12  23-24 Ellensburg - Sun East VHF   16771231 16770231 16771242 16770242
13  25-26 Lewiston ID - Craig Mtn   16771251 16770251 16771262 16770262
14  27-28 Saint Maries ID - Saint Maries   16771271 16770271 16771282 16770282
15  29-30 Coeur d'Alene - Blossom Hill   16771291 16770291 16771302 16770302
16  31-32 Spokane - Krell UHF still on PNW-A 16771311 16770311 16771322 16770322
17  33-34 Spokane - Krell VHF still on PNW-A 16771331 16770331 16771342 16770342
18  35-36 Spokane - Lookout Point still on PNW-A 16771351 16770351 16771362 16770362
19  37-38 Moses Lake - Frenchman Hills   16771371 16770371 16771382 16770382
20  39-40 Ephrata - Beasley Hill   16771391 16770391 16771402 16770402
21  41-42   na 16771411 16770411 16771422 16770422
22 43-44 Spokane Valley - Ridgeline   16771431 16770431 16771442 16770442
23  45-46     16771451 16770451 16771462 16770462
24  47-48     16771471 16770471 16771482 16770482
25  49-50     16771491 16770491 16771502 16770502
26  51-52     16771511 16770511 16771522 16770522
27  53-54     16771531 16770531 16771542 16770542
28  55-56     16771551 16770551 16771562 16770562
29  57-58     16771571 16770571 16771582 16770582
30  59-60     16771591 16770591 16771602 16770602
31  61-62     16771611 16770611 16771622 16770622
32  63-64     16771631 16770631 16771642 16770642
33  65-66     16771651 16770651 16771662 16770662
34  67-68     16771671 16770671 16771682 16770682
35  69-70     16771691 16770691 16771702 16770702
36  71-72     16771711 16770711 16771722 16770722
37  73-74     16771731 16770731 16771742 16770742
38  75-76 Moses Lake - Frenchman Hills   16771751 16770751 16771762 16770762
39  77-78     16771771 16770771 16771782 16770782
40  79-80     16771791 16770791 16771802 16770802
41  81-82 Wrightwood CA - Wrightwood   16771811 16770811 16771822 16770822
42  83-84 Orange County CA - Santiago Peak   16771831 16770831 16771842 16770842
43  85-86 Blue Ridge, California   16771851 16770851 16771862 16770862
44  87-88     16771871 16770871 16771882 16770882
45  89-90     16771891 16770891 16771902 16770902
46  91-92   Inland TG Link 16771911 16770911 16771922 16770922
47  93-94     16771931 16770931 16771942 16770942
48  95-96     16771951 16770951 16771962 16770962
49  97-98     16771971 16770971 16771982 16770982
50  99-100   Local 16771991 16770991 16771002 16770002
NOTE:  References are to repeater managers, not repeaters directly, though they may be listed for additional clarity.
ALL MCT's must TX on timeslot 1
, do not TX on timeslot 2, even though the MCT may control timeslot 2 talkgroups
Local 1 & 2 can be used as shorter MCT Off controls, so the additional MCT talkgroups may not needed in all user zones.
 

How it Works

These talkgroups are special in that they are not used for voice traffic but as a control method (much like DTMF) to override the standard or default talkgroup timers associated with each talkgroup.  Newly created c-Bridge managers (IPSC network repeater groups) will be based on this Master Control Talkgroup (MCT) concept while older managers will keep their hold-off timers as the primary method of talkgroup manipulation, though MCT's may also be supported.

  • Suggested:  Use One Touch buttons or place Local 1 & 2 channels either in position 1 & 2 or 15 & 16 on HT's for easy and frequent access.  One touch is best for MCT on's while MCT off's are best used in position 16 (or 15/16) on a HT for quick kerchunks.  You may wish to set the One Touch menu timer to 30's or so.

  • New PNWDigital.Net managers will have 2 set of two MCT's; "Master Off" and "Master On" for one or both timeslots.  Some older managers have only 1 set of 2 MCT's for control of both timeslots (see chart above)

  • Each MCT On will turn on some or all networked TG's on one or both timeslots (typically 55 or 59 minutes).  On's will seldom be used

  • Each MCT Off will turn off all networked TG's on one or both timeslots (typically 15 or 29 minutes).  Off's (or Local) will be used extensively

  • Local 1 & 2 will also act as MCT Off's but with shorter hold-off timers (typically 5 minutes)

  • Some PTT talkgroups may be turned on via MCT; programming is up to repeater owner on which if any.  These variations may or may not be documented, contact the repeater owner for more information.

How it works for a PNW Local Repeater User

Normally a user should turn off all talkgroups prior to making a call via MCT Off or Local.  Then a kerchunk on the talkgroup of choice will turn this one talkgroup back on.  Once done with a conversation, the user can optionally kerchunk the main TG back on.  If they don't do this, the default state will return within 15-29 minutes, a time span determined by the network manager and/or repeater owners.  This time span is selected to try to match the typical length of a conversation.  If a conversation is longer than the timer, then the user should re-kerchunk the Master Off or you will roll the dice on loosing the timeslot to another talkgroup that may go active during an extended conversation.  This is the MCT method described in it's simplest form.

The stock Master On timer will turn on all talkgroups, including those that are normally full time by default just incase they were turned off.  This likely will be infrequently used while the MCT Off command will be very commonplace. The network manager and/or the repeater owners may select other options such all talkgroups on or some of the PTT talkgroups turned on.  This is all determined before the manager is coded.  So some or all of the PTT talkgroups could be turned on as some sort of monitoring situation.

If the user doesn't Master Off first, then any talkgroup that is fulltime is capable for grabbing the timeslot and preempting the current conversation.  The user would then need to time a Master Off kerchunk between the current talkers Tx cycle.  Then kerchunk their talkgroup back on.  If you don't mind losing your active conversation, then no need to use the MCT's.

It is suggested that users with HT's, program the Master On and Master off MCT's in positions 15 and 16 (and 13/14 if both timeslots are used in one zone).  This will make it easy to spin the dial to the top to quickly turn off the talkgroups.  Mobiles with more channels may wish to have more than 1 MCT set in the zone to simply getting to them for a kerchunk.

Another user radio programming option is to program up the MCT via dedicated front panel keys if your radio supports it so there is no need to have the MCT's using 2 or 4 channel slots in your zone.  Pushing outside the box, the MCT Off TG's could be used a Local only talkgroup on either slot, increasing the versatility of that channel slot.

Example: 

Let's say that Washington 2, PNW 2 and PNW Regional 2 are all on full time (by default), this being typical for most Washington state repeater managers.  Now comes a local user who wants to talk on TAC 310 (PTT by default).  The user has two choices, key up on TAC 310 to turn it on and then begin a conversation or kerchunking "MCT 2 Off" then switching to TAC 310 for a QSO with no other networked talkgroups to bother the QSO on TAC 310. 

If the local user skips the "MCT 2 Off" step, everything can still work fine but those three full time talkgroups could go busy at any time and capture the timeslot thereby taking TAC 310 away from the active local user.  This effectively ends that local users conversation when other networked talkgroups are enabled and idle, but then go active.

To keep from having the rug pulled out from under the local user (another talkgroup barging in), the user should turn off all talkgroups by kerchunking the "MCT 2 Off" talkgroup.  This provides 15 or 29 minutes (typically) of "quiet time" for a conversation.

At the end of the local user's conversation, the MCT 2 On talkgroup could be kerchunked to turn the timeslot's talkgroups back on.  If done though, it will turn on all timeslot 2 talkgroups, which may not be what you really want done.  So you could kerchunk the main TS 2 talkgroup back on, PNW 2 for example or just simply wait for the talkgroups to pop back on when the 15 minute timer expires.

So while MCT's are optional, they play an important role in for local users who wish to engage in a conversation.

PRO's:

  • Simple understanding to our local users on how the system works
  • Either talkgroups are On or Off
  • Can be called up via One Touch front panel programming via TRBO HT's and likely other makes as well
  • Fewer competing timer interactions to confuse users
  • Can be used to monitor nets (passively) without other talkgroup interruptions
  • c-Bridge admin time is minimized by a factor of up to 16 times simply to program a new manager
  • Local 1 & 2 will also act as MCT Off's but can have shorter hold-off timers of 5-15 minutes typically
  • Some c-Bridge groups are already using some form of MCT already. 
  • This admin has used MCT's for years on his local repeater managers and uses them daily

CON's:

  • Less intelligent control dynamically during and between conversations
  • User should know and remember to initiate the sequence before beginning a conversation
  • May require the use of and space for the additional 1, 2 or 4 more talkgroups for dedicated channel space in zones
  • It is a new approach and harder for existing users to embrace the change

While some "automation" is lost as are 1 or 2 channels per timeslot in a subscriber radio zone (suggest using One Touch buttons), this is a huge benefit to the admin who must code in up to all 37 timeslot 2 hold-offs for each of the talkgroups on the timeslot.  At the low end, 15 talkgroups on 1 manager can be 225 hold off timers or up to 1370 timers at the high end.  MCT's require only 1 timer per talkgroup or 15 additional line entries for a minimal timeslot.  Local 1 and Local 2 will add another hold-off timer entry but still well short of the upper end of 1300 plus currently.

In practice, there will likely a dual use of Locals as well as a combination of hold off timers for the full time talkgroups added to supplement the MCT's to insure a better experience by the local repeater users.  But at this point, a new manager with 15 TG's could be created and be useable in about an hour, far less than the 6-8 hours entering all the possible hold off timer combinations.

 

 Revised: 12/01/2020 09:12

 

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