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MARC Standards |
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Home
| Bylaws | Standards | Band Plan | Procedures | Resolutions |
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1.
In all cases, regardless of power output or
ERP, the repeater's transmitter is to be configured so that the
transmitter's physical coverage radius does not exceed the repeater's
coordinated coverage radius.
2.
Remote receivers shall be configured so that their
coverage area lies within the coordinated coverage area of the repeater.
3.
Exceeding the coverage radius limits can be cause
for revocation of the station's coordination.
4.
All new coordinations will include a 25 mile
separation from adjacent channel coordinations.
5.
All new coordinations, except SNPR class, will be greater than 120 miles
from any existing coordinated co-channel repeaters, however, the Coordinator
for the 440 Band, may Coordinate Repeaters at a distance separation of 100 miles.
MARC shall require not less 100 miles separation between co-channel repeaters
that cross state lines. This does not include Canada or Upper Michigan. (see Resolution #9)
To better serve
the amateur community and to better utilize our amateur spectrum. As of April
2, 1996 all new repeater coordinations must cover a min coverage of 10 miles
radius. Existing repeaters must have a minimum coverage of 10 miles radius by
April 2, 1997 excluding snappers. If a repeater system cannot accrue a
minimum coverage the council will re-evaluate the system for re-allocation.
6.
The Coordinator will use the location of
transmitter, antenna elevation, beam direction, ERP, polarization, terrain
and adjacent channel use to determine the distance between One Way Link
transmitters. Repeater type spacing is not required.
7.
The Coordinator will use the protected radius of
the repeater to determine Control cochannel assignments. (minimum 25 Miles)
Example: Regional 55 mile protection and District 40 Miles - distance between
assignments is 95 Miles. Two SNPR Controls would be 50 Miles. Adjacent
channel will not be considered unless interference is encountered. Repeater
type spacing is not required. Repeaters with more than one site (transmitter
and links) should use one control frequency for their complete system if
possible.
8.
The coordinator may grant
reasonable variations in distance separations with the use of Documented
Waivers from all parties and a corresponding condition statement in the
Coordination Documents in case interference is experienced.
9.
Auxiliary stations that are used to link two or more
individual repeater systems shall comply with the following: Transmitter power may exceed 10 watts
to accomplish the link but shall not execeed 50 watts. Links using
transmitter power levels in excess of 10 watts shall use directional antennas
with a minimum of 9 dBi forward gain and the antennas must be aimed so that
the major lobe is centered on the receive site. Higher gain
antennas and using the minimum power necessary to complete a link is recommended
as it allows the coordinator to more effectively assign the available
spectrum. These links are not intended to extend the coverage of
any individual repeater beyond its coordinated area.
10.
Allow One Way Links to be
coordinated North and East of the "A" line in the 430.525 to
430.975 frequency range. Links
will be limited to the area East of 84 degrees longitude. See resolution #10.
11.
Adjacent channel spacing mileage requirements for across
state lines coordination's. (Analog Only) see resolutions #12 and #13
a.
5 kHz - 100 miles
b.
10 kHz - 70 miles
c.
15 kHz - 25 miles
d.
20 kHz - 25 miles
Note: Co-channel spacing is 100 miles
12.
Allow the use of the 441/446
band segments for repeaters in other states providing the following
requirements are met: (see resolution
#13
)
a.
HAAT <= 70'
b.
ERP <= 100 watts
c.
Co-channel separation >= 80 miles
Note: Do not use the following reserved frequencies:
441.050, 441.075, 446.000, 446.025 446.050, 446.075, 446.100, 446.125, and
446.150 which are reserved for packet and simplex operations.
13.
MARC will coordinate digital
repeaters with a necessary bandwidth of less than 6.25 kHz on splinter
channels on the 2 meter and 70 CM bands. MARC will coordinate digital
repeaters with a necessary bandwidth of less than 9 kHz on splinter channels
in the 70 CM band. Necessary bandwidth based on FCC
emission designator. [ splinter means 1/2 way between regular channels].
Repeater
separation standards will be a minimum of 70 miles between
co-channel repeaters. Adjacent channel spacing between digital repeaters will
be left to coordinators discretion; however spacing to adjacent channel
analog repeaters will be no less than 50 miles on 2 meters and 40 miles on
70CM.
(see resolution
#11
and
#16
)
14.
Add
the pair 441.075 repeater input / 446.075 repeater output and 441.150
repeater input / 446.150 repeater output to the available repeater pairs for
coordination by MARC. These
pairs would not be coordinated in Grand Rapids because of an existing ATV
coordination. See Resolution
#15
.
B.
Shared Non-Protected
Repeater (SNPR) coordination class.
1.
Maximum ERP permitted shall be 15 watts.
2.
CTCSS access is required and the specific tone
shall be assigned by the appropriate coordinator.
3.
Frequency pairs are as follows:
4.
Any attempt to evolve to a larger coverage radius
will result in de-coordination of the repeater.
5.
Trustees and sponsors agree to accept co-channel
and adjacent channel interference from other repeaters provided that those
other repeaters are being operated in accordance with their coordination
parameters.
6.
Where interference is being caused to any non-SNPR
system, it shall be the responsibility of the SNPR trustee to work with the
appropriate coordinator to resolve the problem.
7.
Although no out-of-state communication is required
to coordinate a SNPR, care must be taken to avoid creating an interference
problem with existing out-of-state operations.
C.
No new coordinations
will be allowed in the Local coordination class.
D.
Quadrant coordination
class.
1.
To receive Quadrant status, the trustee must
document the potential to achieve the requested coverage radius
through submission of
Height Above Average Terrain calculations
, detailed descriptions of future
station equipment, a system map, evidence of detailed terrain
analysis, and end-user need, as approved by the membership.
2.
To maintain Quadrant status, the applicant must
document that coverage of the coordinated coverage radius does in fact exist.
This will be accomplished with annual submission of an operational report, a
coverage radius map, an updated system diagram, and evidence of user need, as
approved by the membership.
E.
The standard for
testing the repeater's coverage radius shall be a mobile station with a
center roof-mounted antenna with an ERP of 25 watts. This can be a 25 watt
radio with a quarter-wave antenna or a 15 watt radio with a 5/8 wave antenna.
Using this equipment, a mobile station is inside a repeater receiver's
coverage radius if the system is receiving the mobile station at least an 80%
copy 100% of the time. Inversely, for testing repeater transmitters, a mobile
station using a 5/8 wave antenna is inside a repeater transmitter coverage
radius if the mobile station is receiving the repeater's transmitter at least
an 80% copy 100% of the time. All tests should be made at average terrain
during non-enhanced band conditions.
F.
Any coordinated
repeater operating within its coordination parameters at the
time of adoption of these standards shall be grandfathered at those
parameters. 1. If updates by submitting a Technical Data Sheet (from the system sponsor) are not received a minimum of once every two years the (MARC) coordinator may withdraw the Co-ordination Authorization. When a determination has been made, by means of research (to be documented by the Frequency Coordinator) that a frequency pair has not been in use for sixty days , the Frequency Coordinator will send an inquiry by tracked mail to the trustee of record. Adding tracking to a letter informs MARC when the letter was delivered to the address of record.
2.
Should no response be received within thirty days
from the date of receipt of this letter, or if the letter is returned as not
deliverable, the coordination of the frequency pair will be rescinded. If the
trustee responds within thirty days, in writing to the coordinator and the chairman
of M.A.R.C., requesting that the coordination be maintained, at the
discretion of the Board, any further action may be stayed for up to ninety
days.
3.
If the repeater is moved more than 5 miles from the
original location without notification to the M.A.R.C. coordinator and
chairman, COORDINATION IS AUTOMATICALLY WITHDRAWN.
4.
In the event of the sale of a coordinated repeater,
the coordination of the repeater will have a temporary status for the period
of 60 days, UNTIL THE SELLER RELINQUISHES THE FREQUENCY COORDINATION IN
WRITING (sent to the frequency coordinator and chairman by U.S.P.S. mail, and
the buyer agrees to all of the coordination guidelines, and the unmodified
coordination has been approved by the coordinator. IF THESE TERMS CANNOT BE
MUTUALLY AGREED UPON BY ALL PARTIES, THE COORDINATION WILL BE CONSIDERED
VOID.
5.
(Holders of frequency coordination, IE: sponsors
and trustees) who terminate their coordination as a result of the sale or
transfer of their system, or for other reasons with the intent not to resume
such operation shall notify the Coordinator and Chairman of the termination
within 30 days of the cessation of the operation and the surrender of the
frequency involved. The Coordinator will then entertain requests for eligible
applicants for the use of the frequency, IN THE BEST INTERESTS OF AMATEUR
RADIO AND THE PUBLIC SERVICE.
6.
Sponsors of 5 or more repeaters may report their yearly updates, with a 1
year grace period, using a spread sheet in lieu of the web page TDS
update/renewal submission. The spreadsheet containing the current data
for the trustee's coordinations will be sent to them upon a request to the
database manager. The spread sheet must be checked for accuracy by the
trustee. Corrections to the coordinations data must be made on the spread
sheet. Please highlight any changes. The Trustee should insert their name
and date at the bottom of the sheet and email it to the MARC database manager
at mail@miarc.com. This will then be checked by the database manager and if
accepted, the MARC database will be updated. This will be valid for 1 to 2
years. Individual updates must be made on the MARC web page by submitting
a TDS application if changes are made to a coordination that require
re-coordination.
II.
Band Plans.
A.
All band plans shall be in accordance with the ARRL
recommended band plans as listed in the ARRL Repeater Directory, 1989-90 edition,
except as noted below.
Non-standard pairs or offsets will not be coordinated.
B.
50 MHz Band
C.
All activities above 51.100 are on 20 KHz
channels
D.
144 MHz Band
The following
frequency pairs are to be utilized for repeater coordinations. All offsets will
be 600 KHz, except SNPRs. The division of the band segments will be made in
20 KHz increments.
E.
For packet operations, the following channels will
be protected from coordinated operations.
F.
222 MHz Band
The following
frequency pairs are to be utilized for repeater coordinations. All offsets
will be 1.6 MHz. The division of the band segments will be in 20 KHz
increments.
G.
The following frequencies are to be allocated to voice
links. The division of this band segment will be in 20 KHz increments.
Transmitter power output is limited to 10 watts.
H.
A statewide control link frequency of 222.320 is allocated
to any trustee desiring a 222 MHz control frequency. For packet operations,
the following channels will be protected from coordinated operations.
I.
420 MHz Band
The following frequency
pairs are to be utilized for repeater coordinations. All offsets will be 5
MHz. The division of the band segment will be in 25 KHz increments.
The following frequencies
are to be allocated to voice and control links. Reserved packet and simplex
frequencies are also indicated. The division of these band segments will be
in 25 KHz increments. Transmitter power output is limited to 10 watts for
link transmitters.Please follow the link below to view the 440 Band Plan for
Voice and Control links, ATV,
Packet, Simplex and Repeater Frequencies
.
J.
902 MHz Band
(33cm)
The purpose of
this section is to place a uniform and specific written documentation
concerning coordination and cooperation in the use of the 33cm spectrum as
allocated to Amateur Radio by the FCC in accordance with statements made in
Article I of the MARC Bylaws.
Frequencies
Covered:
902.0000 MHz to
928.0000 MHz
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Guidelines: Repeaters:
The following is criteria to be met for the coordination of repeaters in the 33cm band.
Repeater frequencies
must fit into the bandplan as stated above. Repeater
owner/Trustee must comply with rules concerning TDS submission as stated in
the
MARC Bylaws, Co-Channel Protection Distance: No
repeater shall be given a protection distance of more than 50 miles without a study
clearly showing the need for such. This study can be done using methods
outlined elsewhere in this document. The protection distance of a
coordinated repeater may be less than 50 miles, but shall not exceed
50 miles without a
propagation study indicating the need for additional protection distance. Adjacent Channel Protection : Repeaters
using adjacent channels shall have a minimum physical distance between
transmitters. This distance shall be determined by using half of the
distance of the Protection
Radius of the repeater with the largest protection distance. Definitions: Channel.
– Frequencies within a given spectrum with designated spacing to provide
uniformity in frequency utilization. Co-Channel.
– A common frequency shared between two coordinated repeaters. Adjacent
Channel. – A channel that falls either immediately before or after the
desired operating frequency. Protection
Distance. – The minimum physical distance between two transmitters. Protection
Radius. – The averaged distance from the transmitter that the transmitted
signal is useable by a
receiver of reasonable sensitivity.
Coverage Prediction
Study: Coverage
prediction shall be done in one of three ways. 1: Accept the minimum
protection radius as the maximum coverage area. 2: True coverage area study
done with calibrated test equipment. 3: Approved software
designed to provide coverage modeling. Coverage
area is to be defined as an average distance of coverage from the Repeater
transmitter based on a signal of at least -110 dBm in 75% of locations 75
% of the time. This translates roughly to a signal that is useable by an
average user
listening to a voice repeater in a mobile situation with a radio of average receive capability (roughly 0.3 microvolts). |
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Adapted from MARC Standards, REV 01
2 December 1989, as amended
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Section J 902 MHz
Band(33cm) was added to MARC Standards on June 4, 2005 by voice vote, after
being in use as Resolution # 3, since September 2003. |