Harmonics are generally much higher as considerable effort is spent in reducing intermodulation and other non-harmonically related spurious signals. Today a variety of modulation formats may be available in a signal generator. These may be will outside the operating frequency range of the unit under test, and the signal generator will need to accommodate these and any other requirements.All signal generators produce some level of spurious signals. As a result it is necessary to check the signal generator specifications to ensure that it has the required capabilities.Originally many signal generators had the capability to have amplitude modulation, AM , and frequency modulation, FM applied. However there are elements including temperature stability, line voltage stability, ageing (i.e. RF signal generators vary considerably in performance. These need to be added statistically to gain the overall "accuracy" for the radio frequency signal generator. The accuracy of the attenuator then provides the relative accuracy of the individual steps while the maintained level of the amplifier provides the absolute level accuracy. 99 All accuracy measurements are specified in terms of parts per million (PPM). As with any item of test instrumentation, the specification sheet sets out the performance of the particular RF signal generator.The set of specifications used for RF signal generators is tailored towards the performance parameters that are of importance in that scenario.
Accordingly it is necessary to know what can be tolerated.The level of phase noise from a radio frequency signal generator will generally fall as the offset from the carrier increases. Frequency is a measure of how fast a repetitive signal repeats per unit time and commonly measured in Hz (cycles per second).
These may include: various forms of phase shift keying, PSK (including BPSK, QPSK, 8PSK, etc) as well as other more complicated modulation formats including quadrature amplitude modulation, QAM (including 16 and 64 point QAM) need to be used. The output of a signal generator generally consists of an attenuator and this gives the ability to vary the output level. However with radio and wireless systems using far more advanced forms of modulation, many signal generators have very comprehensive modulation capabilities. For example, when testing radio receivers it is necessary to test their susceptibility to out of band signals at image and other frequencies. It is necessary to work out what is needed, and what will be needed to enable the best option to be chosen. the steady drift with time over many months of the crystal within the reference standard, etc. In some circumstances it is likely that the response may be very sensitive to the signal generator level. dB relative to one milliwatt.Although different signal generators have different output levels, the most common maximum output level is +13 dBm, although whatever the exact maximum level is, it is normally in the range 10 to 100 milliwatts, i.e. With a low price, reliable performance, and multiple built-in functions, RF signal generators are general purpose instruments, ideal for R&D, manufacturing, education, and service maintenance. RF Signal Generators have maximum frequencies that vary per model, but generally accepted maximum is 6 GHz, which overlaps with Microwave Generators that start in the MHz range up to 20 GHz maximum.
While a synthesized signal generator offers many advantages from exact frequency selection to stability, and high levels of programmability, the issue of phase noise can be a problem in some generators, and the phase noise spec needs to be carefully considered. One items that has to be noted on many signal generators these days is the level of phase noise that is produced. KKmoon RF Signal Generator, 0.5MHz-470MHz RF Signal Generator Meter Tester for FM Radio Walkie-Talkie Debug Digital CTCSS Singal Output 4.5 out of 5 stars 2 $80.99 $ 80 .
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