[Elecraft] hp 8640 signal generator

[Jim Wiley]

Robert -


Try using a low-frequency AC signal, as from a function generator, and 
DC couple it to the 8640B FM modulator input.  Depending on how much 
sweep you need, I think this will work. I am pretty sure the 8640B FM 
section will respond to DC.

If you have a function generator, and it generates sawtooth waves, you 
can use the same signal to drive your scope. 


Alternately, if you don't have a function generator, but do have a 
fairly modern scope, then perhaps it has a "sweep out" signal (often on 
the rear panel) that you could use to drive the 8640B FM section.  The 
results would probably be the same.  Using DC coupling insures that low 
frequency signals make it all the way through the amplifier chain in the 
various instruments.


Other than not having retrace blanking, the results should look pretty 
much like any sweep generator / detector combo.


- Jim, KL7CC



Robert Tellefsen wrote:
> I have a nice 8640, which is an excellent signal generator.
> However, I'm interested in sweeping filters with it.
> Does anyone know if there is a way to get it to sweep,
> or are we stuck with manual tuning?
> Thanks and 73
> Bob N6WG
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