# Presentation: 676980

## DCPR FREQUENCY PLANS

- DCS MANUFACTURERS MEETING NOVEMBER 10, 2004
- Peter Woolner
- Mitretek Systems
- _[pwoolner@mitretek.org](mailto: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

**CHAN**
**1**

**CHAN**
**3**

**CHAN**
**5**

**CHAN**
**2**

**CHAN**
**4**

**CHAN**
**7**

**CHAN**
**6**

**CHAN**
**9**

**CHAN**
**8**

**CHAN**
**11**

**CHAN**
**10**

- 401.701000

- 401.701750

- 401.702500

- 401.703250

- 401.704000

- 401.704750

- 401.705500

- 401.706250

- 401.707000

- 401.707750

- 401.708500

- 300 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**
**401.70000 ?**

**CHAN**
**12**

- 401.709250

- 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.)

**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**

- 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

- 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 1**
**401.70100**

- OLD 3 KHZ CHAN 47

- OLD 3 KHZ CHAN 47

- OLD 3 KHZ CHAN 48

- OLD 3 KHZ CHAN 49

- OLD 1.5 KHZ
- CHAN 96

## 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**

- 401.837875

- 401.838625

- 401.839375

- 401.840125

- 401.840875

- 401.841625

- 401.842375

- 401.843125

- 401.843875

- 401.844625

- 401.845375

- 401.846125

- 300 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

- 125 x 3214703 = 401,837875    125 x 3214709 = 401,838625    125 x 3214715 = 401,839375    125 x 3214721 = 401,840125

- OLD 3 KHZ CHAN 47

- OLD 3 KHZ CHAN 47

- OLD 3 KHZ CHAN 48

- OLD 3 KHZ CHAN 49

## 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**