Scheme for 30 MO3 Channels

to firerad2, firerad2, sonofrcma, sonofrcma

A mobile extender scheme just popped into my head - for conventional systems.

Lets assume that radios have - 1 local channel for each agency + 1

county channel for each county + 1 statewide channel for each state +

10 national channels

Of course the local channels are going to be reused extensively - same

with the county channels and the state channels.

To prevent cochannel interference you probably need the following

standardized channels ----- 9 local channels + 9 county channels + 9

state channels + 9 national channels

For example - City 1 would use Local 1 - City 2 would use Local 2 -

City 3 would use City 3 - etc (small cities lets say)

County 1 would use County 1 - County 2 would use County 2 - County 3

would use County 3 - etc

Maine could use State 1 - New Hampshire could use State 2 - Vermont

Could use State 3 - Massachusetts could use State 4 - Rhode Island

could use State 5 - Connecticut could use State 6 - New York could use

State 1 probably (since the NY border is probably always more than 100

miles from the Maine border)

Note - you might be able to get away with 7 local + 7 county + 7 state

+ 7 national channels actually

So - at the most - 36 distinct channels / freqs / base mobile freq

pairs would be involved. (Or 28 if you use 7/7/7/7)

Therefore - if we had 36 extender channels - there would never be a

problem with extenders interfering with each other.

Maybe it would be good to give a concrete example.

Lets say that "FD Local 1" is 153.77 input - 154.43 R - with extender

channels of 163.77 and 164.43. Every FD in the USA that is assigned to

use "FD Local 1" would use those 4 freqs. If you put 30 to 50 miles of

separation between all users of "FD Local 1", there would hopefully

never be any cochannel interference issues.

National 1 could be 154.28 TX/RX with extender channels of 163.28 and

164.28. Any FD that has a disaster or a working fire maybe could shift

their ops to these freqs.

The underlying themes here are - nationwide standardization - and -

the use of 3 or 4 freqs for each "channel"

Every radio would have the same channel load. Positions 1 thru 9 are

Local 1 to Local 9. Positions 11 to 19 are County 1 to County 9.

Positions 21 to 29 are State 1 to State 9. Positions 31 to 39 are

National 1 to National 9.

The National channels could be used as Disaster channels or as local

fireground / spare channels.

--------------------------

2013