FREQUENCY MATRIX FOR THE MARITIMES TRUNK MOBILE RADIO SYSTEM
Last updated September 22, 2017
This is not an official document. Because it is a Marscan custom built matrix some nomenclature, such as "Sequence" and "frequency block" are entirely arbitrary.
Note: It is intended that the matrix shown here will have to be scrolled in order to be completely seen. If you are having trouble doing so, i.e. you cannot see the whole thing, please let me know. Also there may be comments or information in the description that you may wish to correct or add to. Please let me know. When I bring this up on my own computer I can see the whole grid, but there is a glitch in the Frequency 21 column which for some reason shows it wider than it should be. I am putting this up as is, and will work on that minor problem.
The MTMRS is established within the North American 700 MHz Public Safety Band. This band has two segments, one from 769 to 775 MHz and a counterpart segment 30 MHz higher from 799 to 805 MHz. In the context of MTMRS, the lower segment is made up of repeater output frequencies. The upper segment is made up of input frequencies. Listeners are generally only concerned with the output frequencies from repeaters, and, with this in mind, only the lower segment is dealt with here. Note that it is also possible to have simplex and conventional repeater use of this band, but MTMRS does not do this. All simplex and conventional repeater use associated with MTMRS is on the 800 MHz band.
MTMRS uses practically the whole span of the 769-775 MHz band, but does not use all of the frequencies. Some are simply not apparently assigned for any use in our area, but additionally there are several frequencies set aside internationally for low power use and for interoperability. These are not currently used with MTMRS. Interoperability in this sense means use by members of various different systems who would have some common frequencies and therefore be able to intercommunicate via these frequencies. Interoperability in our Maritimes context now generally means something a little different, i..e. different users of this one system are able to talk to each other via common talk groups, not common frequencies, which in effect we already have.
All sites in the system have at least a Control Channel, an Alternate Control Channel, and two Voice Channels. Voice Channels are sometimes referred to as Voice Paths. In some contexts the ACC is considered to be a VC, but the default total channels for a standard rural site is four channels. Each of these channels is carried on a repeater, so it can also be said that each standard site has four repeaters. Most of the time, perhaps almost all the time, the Control Channel receives and transmits data only. The Alternate CC is designated to "take over" if the the CC repeater fails, but there have been some cases in the earlier NS TMR1 in which the CC and ACC regularly alternated with each other, without there being any failure involved. In most cases the ACC is only used for voice if the two designated VC's are busy.
Most listeners are only interested in what they can hear on the system, with a few also interested in figuring out which sites they can pick up. Any scanner capable of tuning the 700 MHz band and trunktracking the system requires only the input of the relevant CC frequency for the site to be monitored. The scanner learns the voice frequencies from the data stream and goes to them automatically. Many listeners will also input the ACC in case the CC goes down. Due to this, the other frequencies are generally of no interest to the normal hobbyist. This also implies that this page and its matrix will be of interest only to those who are interested in the behind-the-scenes structure of the system as I am.
Channels or frequencies in the 700 MHz band as depicted here are 12.5 kHz (0.0125 MHz) apart. Thus the frequencies progress up the band starting at 769.00625 MHz (Channel 1) as follows:
Note that 769.01875 is 12.5 KHz or 0.0125 MHz higher in frequency. You would expect that this next frequency would be designated Channel 2 but it is actually called Channel 3. This is because there is another version of the band plan that has twice as many channels but only 6.25 kHz wide, and in that plan there would be intervening channels that would use the even numbers. So the yellow block you are looking at shows you Channels 1 to 11 of the 12.5 channel plan.
The first section of the band, shown above, is not actually used in trunking, so here is the lowest part actually used in the MTMRS, these being Channels 13 to 21. Each of these is used as a CC at various sites in the MTMRS. For example, 769.08125 is used at Chaswood, New Germany, Fox Island, Caledonia PEI, and Baie-Ste-Anne. I will for illustration purpose call this the Chaswood Group of sites. Note that the next CC down the chart is 0.0125 MHz higher in frequency.
|Chaswood Group of Sites||769.08125|
At any one site the frequencies are
0.2500 MHz apart. The ACC is therefore 0.2500 MHz UP from the CC, then
comes VC1, then VC2. This is an almost invariable pattern. It is
possible for Bell to use a normally VC frequency as a CC or ACC and conversely
the normal CC or ACC frequency be used as a VC but this is either not happening,
or is extremely unusual. I have seen frequency lists showing this at one
or two sites, but that is unconfirmed, so I am for now going on the concept that
the CC/ACC/VC/VC pattern is universal throughout the MTMRS.
Here is the continuation of the above example, so for example all the sites in the Chaswood group, the top row, use the same four frequencies.
If a site is one that requires more voice channels the first few extra ones will also follow on smoothly in this pattern. Here is the above block expanded:
In this example, none of the Chaswood group, top row, has any extra repeaters at present, but if they did they would almost assuredly use one or both of the two frequencies shown in white. The next group down does have at least one site that has two extra repeaters, and these frequencies are shown in blue to show they are in use somewhere in the system but not at all of the sites in the group. This second group is made up of the following sites: Amherst, Eaton Lake, Preston, North Side East Bay, Rocky Mountain, Elmira and Lorne. Of these only the Preston site currently has the extra (blue) frequencies, but in theory the others could in the future have one or both installed.
The example above shows a maximum of two extra repeaters, but could there be more in the progression? That depends. Here is a further expansion of the block shown above:
You will see immediately that the top row, the Chaswood group, is limited to two extra repeaters, because a whole new repeater group in then next part of the same sequence is in place somewhere in the system, with a CC at 770.58125 MHz. That appears to be no problem, as no Chaswood group site is even using any extras at all. But look at the third group down. This is a group of six sites, with two of them, in Tantallon and Salisbury, using two extra repeaters. If a third extra was needed, there is no place to go. Currently in the system there are no frequencies that are used as CC's in a location but used as a VC in another. Now look at the second group, the Amherst group. Notice that this row does not have another CC/ACC/VC/VC immediately following, and it would appear that this group could have more extras added in at the right. On the other hand, we don't really know that. Maybe 770.59375 is set aside for future sites, or perhaps it is set aside to assign to future other users, completely separate from MTMRS, either somewhere in the Maritimes or in adjacent areas in Maine or Quebec. In fact in the whole matrix there is at present only one instance where there are three extras in a row, this being at Maritime Centre in downtown Halifax:
This does not mean that there could not in the future be more sites with three extra voice channels in a row, or perhaps with even more in a row. but when you look at the complete matrix you will see that there are not many opportunities for that happening due to other groups commencing as was shown above.
The statement above might imply that the maximum number of repeaters or frequencies at a site is seven, at Maritime Centre, but that is not the case. There are sites that have more. In fact Maritime Centre has nine repeaters. So where are the other two? Some sites needing extra repeaters have frequencies added that come from different sequences. Maritime Centre has two of this sort.
In the matrix, frequencies that are used by a site that is otherwise using a different sequence of frequencies are shown in dark blue. So in our example above, 770.38125 is in darker blue. This frequency looks like it could be used as the second extra in the fourth group of repeaters. At present none of them need it, and maybe never will. So another site has "borrowed" it because the next frequency in that site's normal sequence is not available. In the example above, 770.38125 is being used by Shubenacadie, which is otherwise on a different frequency sequence. Note that the green CC 770.63125 and its attendant ACC and two VC's is not the Shubenacadie group, thus the Shubenacadie use of 770.38125 appears to be quite random in nature. This frequency is not being used anywhere else in the MTMRS.
Just before going to the overall matrix, I do want to point out that there are three otherwise unused frequencies that are assigned to six sites in Nova Scotia, with each of the three frequencies being used at two sites. These are the special air/ground trunk frequencies. Originally aircraft were banned from the trunk system due to potential interference issues but reason prevailed and a compromise solution was reached. When the Nova Scotia DNR and Lifeflight helicopters take off and rise above treetop level, their on-board trunk radios go into a mode that allows them to communicate only via six sites (Rear Big Hill, Nuttby Mountain, Melrose, Musquodoboit Hbr, Blomidon and Caledonia) and only on these 3 channels, with each channel being used at two of the sites. At these sites their one A/G repeater is available only to the aircraft, and it does not matter what talkgroup is being used. These three frequencies are marked in the brownish colour. One has to wonder if in the future a aimilar arrangement will be extended into New Brunswick. Prince Edward Island is already adequately covered via the Nuttby Mtn site, if not others.
|Lo Pwr Segment||FREQUENCY BLOCK A||FREQUENCY BLOCK B||FREQUENCY BLOCK C||FREQUENCY BLOCK D||FREQUENCY BLOCK E||FREQUENCY BLOCK F|
|SEQ||FREQ 1||FREQ 2||FREQ 3||FREQ 4||FREQ 5||FREQ 6||FREQ 7||FREQ 8||FREQ 9||FREQ 10||FREQ 11||FREQ 12||FREQ 13||FREQ 14||FREQ 15||FREQ 16||FREQ 17||FREQ 18||FREQ 19||FREQ 20||FREQ 21||FREQ 22||FREQ 23||FREQ 24|
|1||Out of Band||769.08125||769.33125||769.58125||769.83125||770.08125||770.33125||770.58125||770.83125||771.08125||771.33125||771.58125||771.83125||772.08125||772.33125||772.58125||772.83125||773.08125||773.33125||773.58125||773.83125|
|2||Out of Band||769.09375||769.34375||769.59375||769.84375||770.09375||770.34375||770.59375||770.84375||771.09375||771.34375||771.59375||771.84375||772.09375||772.34375||772.59375||772.84375||773.09375||773.34375||773.59375||773.84375||774.09375||774.34375||774.59375||774.84375|
|3||Out of Band||769.10625||769.35625||769.60625||769.85625||770.10625||770.35625||770.60625||770.85625||771.10625||771.35625||771.60625||771.85625||772.10625||772.35625||772.60625||772.85625||773.10625||773.35625||773.60625||773.85625||774.10625||774.35625||774.60625||774.85625|
|4||Out of Band||769.11875||769.36875||769.61875||769.86875||770.11875||770.36875||770.61875||770.86875||771.11875||771.36875||771.61875||771.86875||772.11875||772.36875||772.61875||772.86875||773.11875||773.36875||773.61875||773.86875||774.11875||774.36875||774.61875||774.86875|
|5||Out of Band||769.13125||769.38125||769.63125||769.88125||770.13125||770.38125||770.63125||770.88125||771.13125||771.38125||771.63125||771.88125||772.13125||772.38125||772.63125||772.88125||773.13125||773.38125||773.63125||773.88125||774.13125||774.38125||774.63125||774.88125|
|6||Out of Band||769.14375||769.39375||769.64375||769.89375||770.14375||770.39375||770.64375||770.89375||771.14375||771.39375||771.64375||771.89375||772.14375||772.39375||772.64375||772.89375||773.14375||773.39375||773.64375||773.89375||774.14375||774.39375||774.64375||774.89375|
|7||Out of Band||769.15625||769.40625||769.65625||769.90625||770.15625||770.40625||770.65625||770.90625||771.15625||771.40625||771.65625||771.90625||772.15625||772.40625||772.65625||772.90625||773.15625||773.40625||773.65625||773.90625||774.15625||774.40625||774.65625||774.90625|
|8||Out of Band||769.16875||769.41875||769.66875||769.91875||770.16875||770.41875||770.66875||770.91875||771.16875||771.41875||771.66875||771.91875||772.16875||772.41875||772.66875||772.91875||773.16875||773.41875||773.66875||773.91875||774.16875||774.41875||774.66875||774.91875|
|9||Out of Band||769.18125||769.43125||769.68125||769.93125||770.18125||770.43125||770.68125||770.93125||771.18125||771.43125||771.68125||771.93125||772.18125||772.43125||772.68125||772.93125||773.18125||773.43125||773.68125||773.93125||774.18125||774.43125||774.68125||774.93125|
|10||Out of Band||769.19375||769.44375||769.69375||769.94375||770.19375||770.44375||770.69375||770.94375||771.19375||771.44375||771.69375||771.94375||772.19375||772.44375||772.69375||772.94375||773.19375||773.44375||773.69375||773.94375||774.19375||774.44375||774.69375||774.94375|
|11||Out of Band||769.20625||769.45625||769.70625||769.95625||770.20625||770.45625||770.70625||770.95625||771.20625||771.45625||771.70625||771.95625||772.20625||772.45625||772.70625||772.95625||773.20625||773.45625||773.70625||773.95625||774.20625||774.45625||774.70625||774.95625|
|12||Out of Band||769.21875||769.46875||769.71875||769.96875||770.21875||770.46875||770.71875||770.96875||771.21875||771.46875||771.71875||771.96875||772.21875||772.46875||772.71875||772.96875||773.21875||773.46875||773.71875||773.96875||774.21875||774.46875||774.71875||774.96875|
|13||Out of Band||769.23125||769.48125||769.73125||769.98125||770.23125||770.48125||770.73125||770.98125||771.23125||771.48125||771.73125||771.98125||772.23125||772.48125||772.73125||772.98125||773.23125||773.48125||773.73125||773.98125||774.23125||774.48125||774.73125||774.98125|
|14||Out of Band||769.24375||769.49375||769.74375||769.99375||770.24375||770.49375||770.74375||770.99375||771.24375||771.49375||771.74375||771.99375||772.24375||772.49375||772.74375||772.99375||773.24375||773.49375||773.74375||773.99375||774.24375||774.49375||774.74375||774.99375|
|15||769.00625||769.25625||769.50625||769.75625||770.00625||770.25625||770.50625||770.75625||771.00625||771.25625||771.50625||771.75625||772.00625||772.25625||772.50625||772.75625||773.00625||773.25625||773.50625||773.75625||774.00625||774.25625||774.50625||774.75625||OUT OF BAND|
|16||769.01875||769.26875||769.51875||769.76875||770.01875||770.26875||770.51875||770.76875||771.01875||771.26875||771.51875||771.76875||772.01875||772.26875||772.51875||772.76875||773.01875||773.26875||773.51875||773.76875||774.01875||774.26875||774.51875||774.76875||OUT OF BAND|
|17||769.03125||769.28125||769.53125||769.78125||770.03125||770.28125||770.53125||770.78125||771.03125||771.28125||771.53125||771.78125||772.03125||772.28125||772.53125||772.78125||773.03125||773.28125||773.53125||773.78125||774.03125||774.28125||774.53125||774.78125||OUT OF BAND|
|18||769.04375||769.29375||769.54375||769.79375||770.04375||770.29375||770.54375||770.79375||771.04375||771.29375||771.54375||771.79375||772.04375||772.29375||772.54375||772.79375||773.04375||773.29375||773.54375||773.79375||774.04375||774.29375||774.54375||774.79375||OUT OF BAND|
|19||769.05625||769.30625||769.55625||769.80625||770.05625||770.30625||770.55625||770.80625||771.05625||771.30625||771.55625||771.80625||772.05625||772.30625||772.55625||772.80625||773.05625||773.30625||773.55625||773.80625||774.05625||774.30625||774.55625||774.80625||OUT OF BAND|
|20||769.06875||769.31875||769.56875||769.81875||770.06875||770.31875||770.56875||770.81875||771.06875||771.31875||771.56875||771.81875||772.06875||772.31875||772.56875||772.81875||773.06875||773.31875||773.56875||773.81875||774.06875||774.31875||774.56875||774.81875||OUT OF BAND|
|White cells are frequencies not presently used in the MTMRS and not known to be otherwise assigned. It is possible that these are reserved for other users in our area, or adjacent in Quebec or Maine.|
|Control Channel frequency. See below for specific assignments.|
|Alternate Control Channel frequency|
|Voice channels 1 and 2 (standard number)|
|Additional voice channels that follow on in sequence from VC 1 and 2.|
|Additional voice channels at a few sites. These are from a different group than the CC/ACC/VC1/VC2|
|Low Power; not assigned in trunk system.||Low power||not assignable to trunk sites.|
|769.00625 MHZ is Channel 1 in the band plan. Channel #'s ascend by 2's. Thus 769.01875 is Channel 3. Even numbers are reserved for subdivisions of these 12.5 MHz channels.|
|770.96875||Air Ground frequency at Caledonia and Nuttby, used only by DNR and EHS helicopters, which are allowed only on these 3 frequencies at these 6 sites when aloft.|
|771.46875||Air Ground frequency at Blomidon and Melrose, used only by DNR and EHS helicopters, which are allowed only on these 3 frequencies at these 6 sites when aloft.|
|773.06875||Air Ground frequency at Rear Big Hill and Musquodoboit Hbr, used only by DNR and EHS helicopters, which are allowed only on these 3 frequencies at these 6 sites when aloft.|
|Internationally allocated interoperability frequencies. Used for simplex and for conventional repeaters. These are not currently in use or installed in MTMRS radios.|
|All sites with the same CC frequency have at least the first four frequencies in the group, but only one or two will have the additional light blue frequencies in the sequence.|
|769.08125||Chaswood (11), New Germany (39), Fox Island (57), Caledonia [PEI] (103), Baie-Ste-Anne NB (52)|
|769.09375||Amherst(4), Eaton Lk (21), Preston (48), NSEB (62), Elmira (100), Lorne NB (71)|
|769.10625||Tantallon (43), ME Pubnico(30), Louisbourg (60), Sutherlands Bog (84), Alma (109), Salisbury (39),|
|769.11875||Airport (12), Kingsburg (37), Tarbotvale (66), Fairmont (81), Mt. Pleasant (107), Riverside-Albert (20), Bettesburg (66)|
|769.13125||Claremont (3), Wellington, NS (13), Great Hill (34), Fenton (55), SW Margaree (74), Perry Settlement Route 880 (21), Elmtree (59)|
|769.15625||Sand R (1), Sackville (47), Granite Village (33), Mabou (77), Rawdon (97), Charlottetown (111), Tignish (110), Castaway (55)|
|769.16875||Shubenacadie (10), Hebbville (36), Lundy (56), Boularderie (65),||Souris (101), O'Leary (108), Doaktown (58), Grove Hill (64), Bathurst (53)|
|769.18125||Wharton (2), Geizers Hill (45), Dalhousie (20), Kiltarlity (75), River John, Caraquet (30)|
|769.25625||Londonderry (7), Barrington (31), Whites Lake (44), Loch Lomond (59), West St. Peters (104), Hardwood Ridge (100), Lavillette (13), St. Martins (40), Atholville (4)|
|769.26875||Churchill (106), Dickie Mtn/Norton (17), St Leolin (87)|
|769.28125||Wentworth (6), Lansdowne (22), Neils Hbr (70), Kingsville (79) Vaughan|
|769.29375||Shelburne (32), C Smokey (69), Piedmont (83),Blackville (28), Shemogue (5), Hazel Hill (41)|
|769.30625||Pugwash (5), Aldersville (41), Tangier (50), Martinique (58), North Mtn (72), Port Mouton, South St. Norbert (84), St. Isidore (86), Hibernia Heights (88)|
|769.31875||Wellington PEI (114), Chaplin Island (56)|
|770.19375||Tiverton (24), Musquodoboit Hbr (49), Rear Big Hill (67), Baker Lk (26), Coburn (7), Kenneth Mtn (68), Penobsquis (37), Allardville (51, Melrose (36)|
|770.20625||Nova Scotia Mobile Site (87), Buckleys Mtn (3), Crabbe Mtn (57)|
|770.50625||E Kemptville (27), Wakeup Hill (40), Chaplin (52), Dalhousie NB (8), Scotch Mtn (81), Shediac(22), Redmondville (St Margarets) (38)|
|770.53125||Queensland (42), Cheticamp (73), Brookland (85), Fairfield (60), Lameque (70), Upham (93), Acadieville (50)|
|770.54375||Mayfield, PEI, Fundy Pk (32), Neguac (14)|
|770.55625||Summerville (102), Den Hill (12), Miramichi (16), Moncton (44)|
|770.58125||Borden (113), Tracadie (92)|
|770.60625||Noel Lake (9), Sellars Brook (38), Lwr Middle R (68), Stanhope (105), Quispamsis (Otty Glen) (101), Seven Mile Ridge (82)|
|770.63125||Saint John (Cottage Rd) (80), Edmundston (Blanchette Mtn) (102), Oak Hill (75), Stanley (91)|
|770.65625||Greenlaw Mtn (6), Mactaquac (35), Veneer Mill (25)|
|770.66875||Four Falls (11), Skiff Lake (83)|
|771.14375||Kintore (69), St. George (85)|
|771.69375||Bethel (27), Durham Bridge (10)|
|771.70625||Hilden (8), New Minas (17), Meteghan (26), Caledonia (35), Marion Br (61), Bouctouche (29), Petersville Hill (18), Ste Anne de Madawaska (23), Newburg (74)|
|771.75625||Morristown (18), Marshalltown (23), Belleville S (29), Glace Bay (64), Nuttby Mtn (86), Jardineville (Richibucto) (19), Riceville (78), Tracey (24), Bristol (2)|
|771.78125||Ellershouse (14), Corberrie (25), Ecum Secum (53), Inverness(76), Pleasant Ridge (77), Deersdale (34)|
|771.85625||Blomidon (16), Hebron (28), Melrose (54), Cape North (71), Whycocomagh (78), Benton Ridge (1), Clair (31), Robinson (79)|
|772.04375||Dumfries (9), Cameron Mtn (15), Indian Mtn A (67), Maces Bay (72)|
|772.05625||Popple Hill (43), St. Stephen (90)|
|772.08125||Campobello (54), Oromocto Water Tower (94)|
|772.09375||McAdam (73), Parker Ridge (76), St Quentin (89)|
|772.11875||Grand Falls (63), Grand Manan (33)|
|772.39375||C Clarence (19), Marinette (51), Aulds Cove (80), E Lynn Mtn|
|773.03125||Royal Rd (Fredericton) (42)|
|773.18125||Martock (15), Maritime Ctr (46), Coxheath (63), Antigonish (82), Harcourt (65)|
|774.03125||Gowland Mtn (62)|