Simulcast

Police radio and other types of two-way radio often use simulcast to increase range and frequency control is crucial in these systems. In the past, frequency control was accomplished by using matched quartz oscillators. This method ensured that the oscillators at all sites were very close in frequency, but it also required calibration at each transmit site once or twice a year for low- and high-band systems. Re-calibration at UHF and 800 MHz systems needs to occur much more frequently. Maintaining and calibrating oscillators on a regular basis can be very costly.

Most frequency control methods today reference the Global Positioning System (GPS). This method requires no re-calibration and the frequency accuracy is better than 0.01 hertz at the carrrier frequency. EndRun Technologies offers several helpful products to minimize costs when upgrading a simulcast system.

One such product is the Model 3021-5 Tycho GPS Frequency Reference. The Tycho is a very reliable frequency reference with an MTBF of 25 years based on demonstrated field data. In addition to a 1 PPS output, this model provides four 10-MHz frequency output signals with exceptional spectral purity and high channel-to-channel signal isolation. Features include:

• A 1 PPS output with <20 nanoseconds RMS timing accuracy to GPS.
• A frequency accuracy better than 1x10-13.
• Four 10MHz low-phase-noise outputs.
• An alarm output
• A network port with TELNET, FTP, and more.
• An RS-232 serial port.
• Two-year warranty, free technical support and software upgrades for life.
• Options: Additional LPN Outputs, 10 MPPS, Pulse Rates, -48Vdc Input.

Other products and options are available. For a competitive price quote or to discuss your specific requirements Email or call us between 7:30 am and 4:30 pm Pacific Time at:

1-877-749-3878