1. Simulcast GPS Master Oscillators CTCSS Synchronization
Carrier Accuracy
CTCSS Synchronization
Ed O’Connor

2. Simulcast’s Technical Challenges
Carrier accuracy (+/- 0.1 Hz)
CTCSS synchronization (+/-30 degrees)
Audio alignment (+/- 30 degrees)
Recovered audio from each site (+/- 0.2 dB)

3. Master Oscillator SecureSync GPS Master Oscillator GPS / OCXO
Synchronizes Carrier Frequency
Synchronizes CTCSS (=PL = CG)
Alternate Versions
GPS / Rb version
GPS / low phase noise OCXO
Manufactured by Spectracom

4. Key Features Locked to GPS 10-MHz outputs for carrier accuracy
Synchronized CTCSS tones
1PPS outputs can be used to control delay
Ethernet port for monitoring and control

5. GPS Locked Locks 10MHz and 1PPS to 24 satellite Navstar constellation
Typically receives 8 or more satellites

6. Frequency Outputs one 10-MHz on rear panel
modules can be added for more 10-MHz or 5-MHz outputs, 3 outputs per card, up to 4 cards per SecureSync
Optional 5-MHz (Motorola standard)
+13dB (1Vrms) into 50 ohms
Accuracy 1x10E-12 = 0.01 MHz

7. CTCSS Outputs Synchronized CTCSS outputs optional
CTCSS = Private Line (PL) = Channel Guard (CG)
Twelve different tones possible – use any as many times as necessary
Exact tone or nearest 1/3 Hz
One 1118 CTCSS Interface Assembly per base station

8. 1PPS Outputs 1PPS on rear panel BNC
<<1usec accuracy when locked to GPS
When unlocked, drift <1usec in 4 hours, <25usec/day

9. Additional Outputs Additional Available Modules
levels, 4 outputs on BNCs
DS1 (or E1) Framed All 1’s on TB

10. Power AC = standard (115/230VAC 50/60Hz) Options +/- 24 to 48VDC
+/- 24 to 48VDC and AC
+/- 12 VDC and AC

11. Oscillator Options
Options Rb
low phase noise OCXO

12. Accessories Accessories CTCSS interface assemblies
Housed version
Rail mounted version
GPS antenna / surge protector / cable
Selector / dist amps for 10-MHz and 1PPS

13. CTCSS Interface Assembly
Model
One required per base station
Outputs on plug-in terminal strip
Input signal source is Master Oscillator DB9
Power input = 12VDC
Rail mount version available (1118-1)

14. GPS Antenna, etc. Model 8225 12 dB cable loss at 1.5GHz allowed
(= 200’ of LMR400)
N type connectors
Model 8226 surge protector isolates rcvr
Model 8227 Preamplifier adds 20dB gain

15. Selector / Dist Amplifier
Model MHz
12 outputs; 2 inputs
Outputs are 750mVrms into 50 ohms
Switchover automatic or alarm input
Powered by 115VAC or 12-24VDC or 48VDC
5-MHz and 1PPS versions available

16. Base Station Interfaces
Details on
Quantar
Mastr III
TB8100
TKR740/840
MT4E

17. Also Available from Simulcast Solutions
Audio Delay
Voter Comparators

18. Master Oscillator Capabilities Questions?
Ed O’Connor

19. GPS Master Oscillator Pricing
SecureSync
Base Price $3450
1) 10-MHz and 1) 1PPS
10-MHz outputs (3/module
CTCSS outputs (2/module)
Alarm contacts
5-MHz outputs (3/module)
12 or 24 to 48VDC power input
DS1 Fr All 1’s outputs (2/module)
1PPSs outputs (4/module))
Antenna
Surge Protector
CTCSS Interface Assembly

20. Distribution Amplifier Pricing
8143 Base Price $2350
12 to 24 or 48VDC power input
5-MHz version n/c
1PPS version