THE 6070A/6071A SYNTHESIZED RF SIGNAL GENERATOR 1-7. The John Fluke Models 6070A and 6071A Synthesized RF Signal Generators are designed for use in the calibration laboratory, engineering laboratory, or manufacturing environments. Both models offer extensive modulation capabilities and use phase-locked loop circuitry to generate fully synthesized signals with extremely low discrete spurious, and phase noise. These versatile instruments are intended for both bench and systems use. When the instrument is used in a system, all front panel control functions (except POWER and MOD OUT level) can be controlled via an IEEE-488, 1978, interface. 1-8. Instrument parameters, such as output frequency and amplitude, can be programmed to specific values or manually adjusted using the Edit Knob (large knob near the lower right corner of the front panel). The Edit Knob is connected to a digital rotary encoder to provide the same continuous manual adjustment capability that an analog tuning control provides, but with the positive positioning of a digital control. The rotary encoder has 25 magnetic detent positions. The user can feel each position of the Edit Knob. 1-9. The major difference between the two models is that the 6071A has twice the output frequency of the 6070A. The output frequency of the 6070A can be selected within 1 Hz over a range from 200 kHz to 519.999999 Mhz (520 MHz). The output frequency of the 6071A can be selected within 1 Hz from 200 kHz to 520 MHz and within 2 Hz from 520 MHz to 1039.999998 MHz (1040 MHz). Both models can produce frequencies outside of the specified ranges, but the performance is not guaranteed. 1-10. The UNCAL annunciator will turn on to indicate that the instrument is operating beyond specified ranges. The synthesized RF signal is available at the front panel RF OUTPUT connector (if the 607XA-830 Rear Panel Output Option is installed, the RF output is available at a rear panel Type N connector). 1-11. Internal frequency reference is a 10 MHz free air timebase (the 607XA-130 Oven Reference Option is available for increased accuracy and stability). This 10 MHz reference can also be phase locked to external references of 1, 2, 2.5, 5, or 10 MHz(0.3 to 4V peak-to~peak sine or square wave) input via a rear panel BNC connector (50 Ohm input impedance, nominally). When an external reference is used, the shift from internal to external is automatic. The 10 MHz reference signal (used as the internal instrument reference) is available as a TTL signal at a rear panel REF OUT connector. 1-12. Below 520 MHz, output level can be selected with a resolution of 0.1 dB over the range of + 19 to -140 dBm (2 V to 22 nV rms) into 50 Ohms. At 520 MHz or above, output level can be selected with a resolution of 0.1 dB over the range of+13 to-140 dBm (I Vto 22 nV rms). Selected level is displayed on the front panel in either dBm or volts (the instrument will convert from one to the other if the units are changed). The internal microprocessor automatically compensates output level for flatness and accuracy although this automatic correction can be disabled (special function 81). 1-13. The RF output signal can be modulated in various combinations of amplitude modulation (AM), frequency modulation (FM), or phase modulation (0M) from internal sources, external sources, or a combination of internal and external sources. Table 1-1 lists all modulation combinations and the possible modulation sources for each combination. Amplitude modulation depth can be selected with a resolution of 0.1 % over the range of 0% to 99.9% (see the specifications for calibrated range). The frequency modulation function allows the output frequency to be deviated while the output frequency is still synthesized unless the DCFM Mode is selected. Maximum index of modulation that can be selected for either FM or 0M depends upon the output frequency and the modulation frequency selected. The internal modulation signal can be made available at the MOD OUT connectors (front and rear panels). An external modulation signal can be either ac or dc coupled through parallel connectors on the rear and front panels (MOD IN connector, 600 Ohm nominal input impedance). External input sensitivity is such that a 1 V peak input signal produces the calibrated modulation. The list of specifications at the end of this section provides detailed information about the modulation characteristics. 1-14. Up to 9 front panel setups can be stored in the internal memory of the standard instrument, but these setups are lost when the instrument is turned off. The 607XA-570 Non-Volatile Memory Option provides 50 memory locations. Since this option is battery powered, front panel setups stored in these 50 locations are not lost when the instrument is turned off. 1-15. Three outputs are available for coordinating the activity of associated devices: sweep analog output, penlift output, and output invalid output. The sweep analog output is available at the front panel SWP OUT connector. This output steps from 0 to 10V as the frequency is swept from the start frequency to the stop frequency. The size of the steps depends upon the sweep width and the sweep increment selected. The penlift output is available at a rear panel BNC connector. This output is a TTL signal that goes high during a sweep retrace and stays high until the next sweep starts. The output valid signal is available at a rear panel BNC connector. This output is a TTL signal that goes high when output frequency, output amplitude, or modulation is potentially unsettled.