Herbert Graf wrote:
> On Sun, 2007-07-29 at 01:47 -0400, Matthew Bajor wrote:
>   
>> I was wondering, what is the difference between a function generator and an
>> RF signal generator, besides the frequency . Does it have ONLY to do with
>> the higher frequency or something else such as the lack of waveforms besides
>> an ordinary sine? Basically, I am looking to buy a Wavetek 2407 and want to
>> make sure I am getting a piece of equipment that can put out an RF carrier
>> sine wave without an input and without modulation.
>>     
>
> I don't know if it's a strict definition, but in general:
>
> - function generator - usually generates more then just sine waves, at
> least in addition to sine some square waves. Often others (ramps,
> triangles), and also often modulation of those waves (i.e. FM, AM, PWM).
> May generate into the RF region, may not.
>
> - RF generator - usually only generates sine waves, but perhaps offers
> more modulation choices. At the most basic I'd expect at least AM and FM
> modulation. Obviously generates in the RF region, and usually doesn't do
> anything for lower frequencies (i.e. 20kHz).
>
> TTYL
>   

It may also be worth adding that function generators tend to be dirtier 
in terms of broadband noise, phase noise, etc. than RF signal 
generators, at least in my experience. 

A lot depends on the specific models, of course, and not every function 
generator has worse phase noise than every RF signal generator, but for 
most receiver measurements I would not generally use a function generator.


Jack
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