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ARC
70 cm Shared Repeater Pair Standards
Coordination Standards
The purpose / advantage of SNP / SRPs is provide pairs for community or small area repeaters where no 'standard' pairs are available. It is recommended that public service event repeaters and temporary emergency repeaters be allowed use of these repeaters.
A. Coverage radius and protection radius figures for the classes are as follows:
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Class of Repeater
Test Pair
Emergency Pairs
Coordinated Shared Pairs
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Coverage Radius
10 Miles
20 Miles
35 Miles
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Protection Radius
NONE
35 Miles
50 Miles
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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 / registration.
The standard for testing the repeater's coverage radius shall be a mobile station with a center of 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's receive coverage radius if the system is receiving the mobile station at least 80% copy, 100% of the time. For testing repeater transmitters, a mobile station using a 5/8-wave antenna is inside a repeater transmitter's coverage radius if the mobile station is receiving the repeater's transmitter at least 80% copy, 100% of the time. All tests should be made at average
terrain, during non-enhanced band conditions.
4. All new coordinations will include a separation from adjacent channels as follows:
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Spacing
25 kHz
50 kHz
75 kHz
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Separation
10 Miles
5 Miles
NO Minimum
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5. Trustees and Sponsors agree to accept co-channel and adjacent channel interference from other repeaters
provided that those repeaters are being operated in accordance with their coordination parameters.
6. Where interference is being caused to any non-SNP system, it shall be the responsibility of the SNP Trustee
to work with the appropriate coordinator to resolve the problem.
7. Although no out-of-state communication is required to coordinate an SNP / SRP Repeater, care must be
taken to avoid creating an interference problem with existing out-of-state operations.
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Shared Test Pair Class
This pair is 'requested' to be REGISTERED with the Coordinator, but not mandatory.
No coordination is required, but the following guidelines are required to allow best use of this
pair. Again, there is NO protection afforded on these repeaters. These frequencies are not meant
for permanent installation. Purpose is for testing and set-up, then moving to another class for
permanent installation.
1. Maximum ERP permitted will be that required not to exceed coverage radius. Any attempt to evolve to a
larger coverage radius will fall outside the parameters provided for in this class and will not be recognized by
the Coordinator. Also, it will be considered as an un-coordinated repeater and treated as such in any
interference or coordination matter.
2. CTCSS Tone Access is requested and encouraged and the specific tone should conform to the ARC State
Tone Plan or a tone can be assigned by the State Coordinator.
3. Frequency Pair is as follows: TX - 442.250 / RX - 447.250 (1 pair)
4. Maximum antenna height will be 30 ft. above ground level, with NO mountain top sites.
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