HP 8924C CDMA in very good working and physical condition, passed all self tests, back plastic feet cracked packed very safe and shipped fast. last use and calibration 2007 mobile station test set provides the key set of measurements to manufacture high quality dual-mode CDMA mobile telephones in a single box. Acting as a calibrated, high-performance CDMA base station, the HP 8924C verifies not only the parametric performance of CDMA phones, but also the functional aspects of phone performance. The HP 8924C is optimized to provide high accuracy measurements with the speed required for efficient manufacturing. These characteristics result in superior performing CDMA mobiles that costs less to manufacture. In addition to its CDMA functionality, the HP 8924C includes full AMPS, NAMPS, and TACS analog phone test capability. With the HP 8924C, you save space and cost by making both analog cellular and CDMA digital cellular measurements with the same box. CDMA Base Station Simulator HP 8924C includes a full QPSK signal generator that follows the TIA IS-95 CDMA air interface specifications for base stations. The CDMA signal generator supports an AWGN (Additive White Gaussian Noise) source as well as up to two CDMA sectors. Sector A supports the following CDMA channels: Pilot, Sync, Paging, Traffic, and OCNS. Sector B offers only a Pilot channel, Traffic channel, and a OCNS channel. Absolute power is individually settable for the AWGN source, Sector A, and Sector B in terms of total power in a 1.23 MHz bandwidth. The total CDMA signal generator power is the sum of these three settings. Individual CDMA channels for sector A and sector B are set in terms of relative level below the set sector power. Using industry standard ASIC's, the HP 8924C supports the protocol required to emulate a CDMA base station sufficiently for mobile station test. The HP 8924C also includes a full OQPSK demodulator for CDMA mobile station transmitter and Frame-Error-Rate receiver measurements. Since CDMA mobile testing is performed in a controlled environment (a cable connects the mobile to the test equipment), the HP 8924C does not support multiple rake receivers or over-the-air signal reception in a faded environment. Functional CDMA Mobile Test HP 8924C performs both mobile or base station initiated call connect and disconnect. Enter the required RF channel number, wait for the mobile to acquire service, connect the CDMA mobile to the HP 8924C, and press the call key. To make a CDMA phone call, mobile station functionality is quickly verified with the HP 8924C. To check voice quality, the HP 8924C offers a voice echo mode delays and then re-transmits to the mobile under test any audio spoken into the CDMA mobile. An operator can quickly verify voice quality by speaking into the phone and then listening to the echoed audio in the mobile's handset. CDMA Transmitter Tests Transmitter tests include fast, DSP-based average power measurements from +38 dBm down to -10 dBm and accurate channel power measurements down to -50 dBm. The tuned channel power measurement reports the power in a 1.23 MHz measured at the internal IF of the HP 8924C. By calibrating the tuned channel power measurement against the average power measurement, the HP 8924C achieves accurate low level CDMA power measurements. These two power measurement modes allow accurate verification of maximum power, open loop power control, and closed loop power control. HP 8924C measures transmitted waveform compatibility by the IS-95 recommended correlated power method "r" (rho). This measurement returns the percentage of transmitted power that correlates to the desired code. In addition, the r measurement reports the frequency error, modulated phase and amplitude error, and the carrier feedthrough. CDMA Receiver Tests The key performance parameter for CDMA mobile station receiver is Frame-Error-Rate performance in the presence of AWON. The FER test quantifies the receiver's ability to correctly demodulate a signal in the presence of high interfering noise. The HP 8924C fully supports service Option 2 (RF loopback mode) to test receiver FER performance. Unlike simple mobile reported FER results, the HP 8924C actually compares the received 9600 bps data to the transmitted 9600 bps pseudo-random data and performs a bit-by-bit comparison to calculate the true frame error rate. The HP 8924C reports FER measurements with confidence limits. With confidence limits, FER measurements are made in the fastest possible time. Simply set the target frame error rate and confidence limit and start the test. The HP 8924C then uses a statistical model to determine if the CDMA phone has passed the test. An HP innovation also extends the confidence limit methodology to stop the test early if the phone exceeds the confidence limit with the specified confidence interval. Early termination on FER tests eliminates wasted time when testing clearly defective mobiles. The HP 8924C supports FER measurements at all four data rates: 9600, 4800, 2400, and 1200 bps. Softer Handoff Verification With two configurable CDMA sectors, the HP 8924C can verify the ability of a CDMA mobile to support softer handoffs. Softer handoff is similar to soft handoff and only differs in that the HP 8924C sends identical power control bits to both CDMA cell sectors. This capability provides a cost effective method of verifying soft handoff functionality in CDMA mobile telephones. Analog Capabilities In addition to its powerful CDMA test capabilities, the HP 8924C retains full analog cellular test capability. Derived from the HP 8920B RF communications test set, the HP 8924C is HP-IB mnemonic compatible with the HP 8920B. The HP 8924C in its analog mode operates identical to the HP 8920B. The only differences between the two units are some default parameters required for the CDMA mode of operation. Optional features on the HP 8920B that are standard equipment for the HP 8924C include: a high stability timebase (with improved performance), signaling, CCITT filter, 6 kHz bandpass filter, and spectrum analyzer/tracking generator. These analog features not only allow the HP 8924 to test the analog portion of dual-mode ratios, but also provides an effective suite of measurement tools for radio troubleshooting.
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