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DCPR FREQUENCY PLANS. DCS MANUFACTURERS MEETING NOVEMBER 10, 2004 Peter Woolner Mitretek Systems pwoolner@mitretek.org 703-610-1724. Possible Frequency Plans. Two possibilities were presented at the Manufacturers meeting in Seattle
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DCPR FREQUENCY PLANS DCS MANUFACTURERS MEETING NOVEMBER 10, 2004 Peter Woolner Mitretek Systems pwoolner@mitretek.org 703-610-1724
Possible Frequency Plans • Two possibilities were presented at the Manufacturers meeting in Seattle • Keep all existing carrier frequencies and add new ones halfway between each of the current frequencies • 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
FREQUENCY PLAN #1 Low Pilot 401.70000 ? 401.701000 401.701750 401.702500 401.703250 401.704000 401.704750 401.705500 401.706250 401.707000 401.707750 401.708500 401.709250 300 bps Channels CHAN 1 CHAN 2 CHAN 3 CHAN 4 CHAN 5 CHAN 6 CHAN 7 CHAN 8 CHAN 9 CHAN 10 CHAN 11 CHAN 12 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 OLD 1.5 KHZ CHAN 4 250 x 1606804 = 401,701000 250 x 1606807 = 401,701750 250 x 1606810 = 401,702500 250 x 1606813 = 401,703250 250 x 1606816 = 401,704000
FREQUENCY PLAN #1 (cont.) Channel 1 401.70100 401.838250 401.839000 401.839750 401.840500 401.841250 401.842000 401.842750 401.843500 401.844250 401.845000 401.845750 401.846500 300 bps Channels CHAN 184 CHAN 185 CHAN 186 CHAN 187 CHAN 188 CHAN 189 CHAN 190 CHAN 191 CHAN 192 CHAN 193 CHAN 194 CHAN 195 OLD 1.5 KHZ CHAN 94 OLD 1.5 KHZ CHAN 95 OLD 1.5 KHZ CHAN 96 OLD 1.5 KHZ CHAN 97 OLD 1.5 KHZ CHAN 96 OLD 1.5 KHZ CHAN 93 1200 bps Channels OLD 3 KHZ CHAN 49 OLD 3 KHZ CHAN 48 OLD 3 KHZ CHAN 47 OLD 3 KHZ CHAN 47 CHANNEL 185H CHANNEL 188H CHANNEL 191H CHANNEL 194H
Channel 1 401.700625 FREQUENCY PLAN #2 401.838625 401.839375 401.841625 401.842375 401.843125 401.843875 401.844625 401.845375 401.846125 401.837875 401.840125 401.840875 300 bps Channels CHAN 184 CHAN 185 CHAN 186 CHAN 187 CHAN 188 CHAN 189 CHAN 190 CHAN 191 CHAN 192 CHAN 193 CHAN 194 CHAN 195 OLD 1.5 KHZ CHAN 93 OLD 1.5 KHZ CHAN 96 OLD 1.5 KHZ CHAN 94 OLD 1.5 KHZ CHAN 95 OLD 1.5 KHZ CHAN 97 1200 bps Channels OLD 3 KHZ CHAN 49 OLD 3 KHZ CHAN 48 OLD 3 KHZ CHAN 47 OLD 3 KHZ CHAN 47 CHANNEL 185H CHANNEL 188H CHANNEL 191H CHANNEL 194H 125 x 3214703 = 401,837875 125 x 3214709 = 401,838625 125 x 3214715 = 401,839375 125 x 3214721 = 401,840125
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
