Phase Matrix/EIP 25B/28B High Performance in a Small Package The 25B/28B family of CW frequency counters is the ideal choice when it comes to communications applications. These half-rack portable, rugged units combine durability and small size with high performance features typically found only in larger bench-top instruments. With simultaneous power measurement capability, and options for a high stability timebase and a protective transit case, these high performance counters are ideally suited for applications in:
• Carrier signal measurement • Transmitter frequency verification • Channel specific signal measurements • Microwave link testing • Channel monitoring Phase Matrix's 25B/28B at a glance • Keyboard controlled frequency limit selection • Power Measurement to 0.1 dB resolution • Power Measurement accuracy to ±0.5 dB typical • -30 dB sensitivity • 200 Watt (+53 dBm) peak damage protection • 10 dB automatic amplitude discrimination • 200 ms acquisition time • Up to 800 MHz/sec tracking speed • 20 MHz P-P FM tolerance up to a 10 MHz rate Selective Frequency and Power Measurements With a single connection, the Phase Matrix 25B/28B counters can simultaneously measure and display the input signal's frequency and power level in the microwave band, eliminating the need for a separate microwave power meter. Within the 25 MHz bandwidth of the YIG-preselector, only the selected signals frequency and power are measured. Signals to be analyzed are selected by keystroke entry of an individual center frequency, or a search range between a high and low frequency limit. This signal selectivity, combined with 20 MHz of FM tolerance at all rates up to 10 MHz, allows the Phase Matrix 25B/28B to make accurate frequency and power level measurements even while the input signal is carrying traffic; there is no need to take the transmitter; or adjacent channels, off the air for routine checks. Easy to Read and Operate Frequency and power measurements can be made to a resolution of 1 Hz and 0.1 dB, respectively. Easy keystroke entry of frequency and power offsets allows system-under-test frequency translation devices and cable losses to be compensated for in the displayed measurement results.
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