美国PTS公司（Programmed Test Source,Inc.）是国际知名的高性能频率合成器（频率综合器）的生产商，具有品质可靠、切换迅速、相位噪声低、产品线齐全等特点，是众多知名企业如A.D.，G.E.，Motoroal，Philips，Siemens，Toshiba等的合作伙伴。频率合成器是以一个精确度、稳定度极好的石英晶体震荡器作为基准频率，利用加、减、乘、除等基本运算技术，以获得与石英晶体震荡器同等精确度和稳定度的大量离散频率信号的设备。它广泛应用于通讯设备、雷达、导航、频率时间标准等各个技术领域。例如，在各种精密仪表中，频率合成器能提供高分辨率、低噪声（相位噪声）的信号，以适应各种精密测量的需要。

SPECIFICATIONS
Frequency
Range: 90******Hz to 119.999 999 9 MHz
Resolution: 0.1 Hz to 100 KHz, optional in decades
Accuracy same as frequency standard
Control: manual by 10-position dial;
remote by TTL-level parallel entry BCD or GPIB (optional)
Switching Time (to within 0.1 radian at new frequency)
100 MHz - 10 MHz digit: 20 μseconds
1 MHz - 0.1 Hz digit: 5 μseconds
Output Level: +3 to +10 dBm (.7V max, 50 Ω), metered in
dBm and volts (rms)
Flatness: ±0.5 dB
Impedance: 50 Ω
Control: manual by front panel control; remote by analog
voltage
Spurious (at full power output, +10 dBm)
Outputs Discrete: -75 dBc within ±30 MHz of carrier,-55 dBc outside;
line related, -80 dBc
Harmonics: -55 dBc
Phase Noise: -75 dBc (0.5 Hz to 15 KHz) including effects of
internal standard
L (1Hz): 10 Hz/ -105 dBc, 100 Hz/ -118 dBc, 1KHz/-128.dBc
10 KHz/-132 dBc, 100 KHz/ -132 dBc
Noise Floor: -135 dBc/Hz
Frequency Internal: OCXO or TCXO
Standard 3 x 10-9/day 1 x 10-8/day
±1 x 10-8/0 - 50ºC ±1 x 10-6/0 - 50ºC
1 x 10-6/year 2 x 10-6/year
External: 10 MHz, 0.4-2.0 Vrms into 300 Ω;
5 MHz, 0.5-2.0 Vrms into 300 Ω
Aux. Output: 10.000 MHz, 0.4 Vrms into 50 Ω
(Note: internal or external standard required for operation)
General Operating Ambient: 0 - 55ºC, 95% R.H.
Power: 105 - 125V, 50 - 400 Hz, 40W (100, 220, 240V optional)
Dimensions: 19 x 5.25 x 18 inches (relay rack or bench cabinet)
Weight: 35 lbs
For units equipped with a DDS-TLU option, specifications are modified as follows:
DDS Option H K
Phase-Continuous 100 KHz thru 0.1 Hz digits 10 KHz thru 0.1 Hz digits
Switching Range (~1 MHz bandwidth) (~100 KHz bandwidth)
Frequency Resolution 0.1 Hz 0.1 Hz
Optional Phase Rotation 0-360° in .36° steps N/A
Switching Time (within phase-continuous range) <1μs transient, 2μs delay
Spurious Discrete:(±30 MHz of fout) -65 dBc -75 dBc
Outputs Phase Noise: -65 dBc -70 dBc

PTS 120 FREQUENCY SYNTHESIZER
• 90- 120 MHz
• + 3 to + 10 dBm output
• choice of resolution
• very low phase noise
• fast switching, 5 - 20μs
• fully programmable, BCD or GPIB
• modular flexibility, remote-only versions
• low power consumption, high reliability
• 7 decades of DDS resolution available
with phase continuous switching