DCPR FREQUENCY PLANS DCS MANUFACTURERS MEETING NOVEMBER 10, 2004 Peter Woolner Mitretek Systems

2 Possible Frequency Plans Two possibilities were presented at the Manufacturers meeting in Seattle a.Keep all existing carrier frequencies and add new ones halfway between each of the current frequencies b.Split each existing channel in half and have the new carrier frequencies offset ±1/4 of the old channel width I can think of no other useful variation I can think of no other useful variation

3 FREQUENCY PLAN #1 CHAN 1 CHAN 3 CHAN 5 CHAN 2 CHAN 4 CHAN 7 CHAN 6 CHAN 9 CHAN 8 CHAN 11 CHAN bps Channels OLD 1.5 KHZ CHAN 1 OLD 1.5 KHZ CHAN 2 OLD 1.5 KHZ CHAN 3 OLD 1.5 KHZ CHAN 4 OLD 1.5 KHZ CHAN 5 Low Pilot ? CHAN OLD 1.5 KHZ CHAN x = 401, x = 401, x = 401, x = 401, x = 401,704000

4 FREQUENCY PLAN #1 (cont.) CHAN 184 CHAN 185 CHANNEL 185H CHANNEL 188H CHAN 187 CHAN 189 CHAN 186 CHAN 188 CHAN 191 CHAN 190 CHAN 193 CHAN 192 CHAN 195 CHAN 194 CHANNEL 191H CHANNEL 194H bps Channels 1200 bps Channels OLD 1.5 KHZ CHAN 93 OLD 1.5 KHZ CHAN 94 OLD 1.5 KHZ CHAN 95 OLD 1.5 KHZ CHAN 96 OLD 1.5 KHZ CHAN 97 Channel OLD 3 KHZ CHAN 47 OLD 3 KHZ CHAN 48 OLD 3 KHZ CHAN 49 OLD 1.5 KHZ CHAN 96

5 FREQUENCY PLAN #2 CHAN 184 CHAN 185 CHANNEL 185H CHANNEL 188H CHAN 187 CHAN 189 CHAN 186 CHAN 188 CHAN 191 CHAN 190 CHAN 193 CHAN 192 CHAN 195 CHAN 194 CHANNEL 191H CHANNEL 194H bps Channels 1200 bps Channels OLD 1.5 KHZ CHAN 93 OLD 1.5 KHZ CHAN 94 OLD 1.5 KHZ CHAN 95 OLD 1.5 KHZ CHAN 96 OLD 1.5 KHZ CHAN 97 Channel x = 401, x = 401, x = 401, x = 401, OLD 3 KHZ CHAN 47 OLD 3 KHZ CHAN 48 OLD 3 KHZ CHAN 49

6 Plan Comparison All plan 1 channel center frequencies are multiples of 250 Hz but plan 2 center frequencies are multiples of 125 Hz This affects phase stability and interference Most plan 1 frequencies are the same as the existing channels (both 300 and 1200) All existing DCPRS synthesizers could tune to most plan 1 frequencies but to none of the plan 2 frequencies RECOMMENDATION: USE PLAN 1