- Buyers Guide
Weatherproof S-band Transmitter
The model CHC29218-250/5650 class C power amplifier system operates over the 2025 to 2120 MHz NASA frequency band with 250 W (min) output power, and is circulator protected. The amplifier system is housed in two weatherproof NEMA enclosures (amplifier and power supply) for direct mounting to an outdoor antenna. Operating temperature is 0° to +50°C with 100 percent condensing humidity. An RF input level of 0 dBm is required for full power output. A low power mode (25 W) is also selectable locally. Prime operating power is 120 VAC single phase 50/60 Hz. Size: 25" x 24" x 12".
12.5 - 25 MHz VCO
The model JTOS-25 surface-mount VCO is the performance solution for measurement instrumentation and phase lock loop circuit applications spanning the 12.5 to 25 MHz frequency range. The thermally rugged VCO features linear tuning characteristics, -26 dBc (typ) harmonic suppression and 1 to 11 V tuning voltage and displays low -115 dBc/Hz (typ) phase noise at 10 kHz offset over the band. Tape-and-reel packaging is available. Price: $18.95 each (5-49).
The model MTXL25 TCXO is available with frequency stabilities of +/-1.5 ppm over -20° to +70°C, +/-2.5 ppm over the -30° to +75°C and +/-5 ppm over -40° to +85°C operating temperature ranges. Frequency adjustment is by means of an internal trimmer. Output is HCMOS/TLL compatible. The model MTVXL25 has the same stability options as the MTXL25 but incorporates voltage tuning. These oscillators are good for PCS, cellular, GPS, test instrumentation and mobile radio base station applications, and are available in a small leadless surface-mount 9.6 x 11.4 x 2.5 mm package.
M-tron Industries Inc.,
(800) 762-8800 or (605) 665-9321.
The model RTVY-174 TCXO offers +/-2.5 ppm stability over the temperature range of -30° to +80°C as a standard feature. It is powered by a 3 V supply and the current drain is 2 mA (max). Output voltage is 0.9 V p-p (min), clipped sinewave, capable of driving a 10 kW load shunted by 10 pF. The unit is available in standard frequencies from 12.6 to 19.8 MHz. The TCXO incorporates a custom IC chip, not a hybrid, and has a footprint of only 6.0 x 3.5 mm. Price: $5.95 each (10,000).
Raltron Electronics Corp.,
mm-wave Active Doublers
The models AK-2X and AKa-2X active doublers operate from 18 to 26 GHz and 26 to 40 GHz, respectively. Input power can be in the range of 10 to 17 dBm and output power options are 15 dBm (min) or 20 dBm (min). Customized input and output power requirements are available. Fundamental and harmonic rejection is 20 dBc (typ), 15 dBc (min). Input connectors are K-type (F) and output connectors are either K-type (F) or waveguide.
Spacek Labs Inc.,
Santa Barbara, CA
1500 - 1600 MHz VCO
The model CLV1550E VCO operates over the frequency range of 1500 to 1600 MHz with a tuning voltage of 0.5 to 5 V DC. The phase noise is -106 dBc/Hz at 10 kHz offset with harmonic suppression of -35 dBc. Load impedance is 50 W, and the unit operates over the temperature range of -40° to +85°C. Applications include digital radios, base stations and mobile communications.
San Diego, CA
3.3 V VCXO
The PVL54I series 3.3 V voltage-controlled crystal oscillator (VCXO) is a low jitter oscillator designed to meet the stringent SONET chip specifications for SONET, SDH and ATM applications. The oscillator is ideal for the AMCC S3041 and S3043 OC-48 transmitter chips and has a total frequency tolerance of less than 20 ppm. Jitter performance is guaranteed to be less than 1 ps in the 12 kHz to 20 MHz band. (Use of a fundamental frequency source rather than a multiplier to reach the output frequency achieves this low jitter.) Center frequency is 30 to 155.52 MHz, temperature range is 0° to +70°C, output load is 50 W and linearity is +/-10 percent (max).
LMDS Phased-locked DRO
The model HP E5500 DRO operates over the frequency range of 12 to 16 GHz with a power output of +13 dBm. Harmonics are -20 dBc and spurious is -80 dBc. Temperature range is -10° to +65°C and operation is +12 V at 160 mA. The DRO is reliable with a rugged design and low microphonics.
The model PV-1103 low noise VCO is designed for cable modems and other applications, and works over a frequency range of 1100 to 2000 MHz with a 10 V supply. The phase noise of the VCO is -100 dBc/Hz at 10 kHz offset and -120 dBc/Hz at 100 kHz offset from the center frequency. The tuning voltage is 1 to 20 V, and the unit operates over the temperature range of -30° to +70°C. Size: 0.5" x 0.5".
Princeton Electronic Systems Inc.(PES),
The model SEL 3400 crystal clock oscillator is designed for high resolution graphics, top-line workstations, and imaging and telecommunications applications and has a frequency range from 7 to 250 MHz, including SONET 155.52 MHz. The SEL 3400 is available in 5, -5.2 and 3.3 V positive/pseudo emitter-coupled logic supply voltages. (The 3.3 V complementary version is also compatible with low voltage differential signaling.) Open emitter outputs allow the user to select the load termination to optimize performance and crystal technology allows for economical and rapid turnaround of custom frequencies. Delivery: stock to 10 weeks.
Menlo Park, CA
(800) 227-8974 or (650) 470-7700.