- Buyers Guide
Synthesized Telemetry Transmitter
The ST400QF series airborne synthesized patented FEHER quadrature phase-shift keying (QPSK) telemetry transmitter doubles the information bandwidth (when compared to conventional PCM-FM) while utilizing class C power amplifiers, which maintain the power efficiency associated with standard FM transmitters. Available in 2, 5, 8 and 10 W (min) power versions, the transmitter is designed for operation in aerospace environments where size, weight, efficiency and frequency agility are important. The ST400QF frequency range can be remotely controlled from 2.2 to 2.3 GHz in 1 MHz steps in a 100 MHz band by application of a remote binary code. Standard output frequency bands are 2200 to 2400 MHz. The unit’s compact, rugged housing measures 15 cubic inches and weighs 18 oz.
AYDIN Telemetry, a division of AYDIN Corp.,
These surface-mount HCMOS oscillators have tight frequency stabilities of 20 to 25 ppm over the temperature range of 0° to 70°C and 50 ppm over the temperature range of –40° to +85°C. Frequency range is 1.544 to 80 MHz with a tri-state enable/disable function. Designed to meet the SONET tolerance requirement, the oscillators are suitable for modem card, computer peripheral and PCMCIA card applications. Size: 5.0 mm x 7.5 mm. An even more compact version rated at 50 ppm measures 3.5 mm x 6.0 mm x 1.5 mm.
The Connor-Winfield Corporation,
5 V Narrowband VCOs
The model ROS-285PV VCOs operate in the frequency range of 245 to 285 MHz. These VCOs feature linear tuning, harmonic suppression of –20 dBc (typ), phase noise at 10 kHz (typ) offset of –100 dBc/Hz and minimum to maximum tuning voltage of 0.5 to 5. They are suitable for integration with monolithic PLL chips and commercial synthesizers. Price: $17.95 each (5–49). Delivery: stock.
The model PVS 1401 VCO for LMDS applications covers the 1400 to 1600 MHz frequency range with a phase noise of –100 dBc/Hz at 10 kHz offset. The model PV 1910 VCO covers the 1910 to 2345 MHz frequency range with a phase noise of –95 dBc/Hz at 10 kHz offset. The model PVS 925 VCO covers the 925 to 975 MHz frequency range with a phase noise of –105 dBc/Hz at 10 kHz offset. The PV 32 VCO covers the 32 to 64 MHz frequency range with a phase noise of –108 dBc/Hz at 10 kHz offset. All four VCOs are surface mounted and have a power output of 10 dBm. Sizes: from 0.5" x 0.5" (PV) to 0.3" x 0.3" (PVS).
Princeton Electronic Systems Inc. (PES),
High Frequency VCO
The model VCO690-5500T VCO generates frequencies from 5400 to 5600 MHz with control voltages from 0.5 to 4.5 V. The unit typically requires 7.14 mA of current from a 5.0 supply voltage. Typical phase noise at 100 kHz offset is 100 dBc/Hz and typical output power is –1 dBm. Second harmonic suppression is –15 dBc (typ) and third harmonic suppression is –20 dBc (typ). The unit is housed in a 0.50" x 0.50" x 0.25" surface-mount, pick-and-place/reflow-compatible package.
Vari-L Company Inc.,
Low Jitter Frequency Translation Device
The model FX070 low noise, narrowband PLL frequency translator generates a 2488.32 MHz output derived from an external 12.96 MHz reference clock. Output signal is 0 dBm (min) into 50 W, supply voltage is 5.0 V DC +/-5 percent and output jitter is < 5 ps rms (typ) at the output frequency. The device offers a drop-in solution for clock frequency translation and clock distribution in SONET/SDH, ATM and other telecommunication applications, and is available in a 16-pin, surface-mountable, gull wing flatpack package measuring 1.00" x 1.00" x 0.28".
Vectron International, a Dover Technologies company,
1100 - 1175 MHz VCO
The model CLV1137A voltage-controlled oscillator is designed for microwave radios, CATV modems and satellite communications applications and generates frequencies between 1100 and 1175 MHz with a tuning voltage of 0.5 to 4.5 V DC. Power output is 1.5 +/-2.5 dBm, load impedance is 50 W and operating temperature range is –40° to +85°C. The device exhibits a remarkably clean spectral signal of –111 dBc/Hz (typ) at 10 kHz from the carrier while attenuating the second harmonic to a level better than –19 dBc. Price: $15 (1000).
San Diego, CA