[R-390] Okay, don't laugh at me but...

[Barry]

Well, I'm looking at an HP-8601A but not sure how that'll turn out.  Short of that, I may ask the locals.  This is a high-tech community so maybe I'll get lucky.

Thanks,
Barry - N4BUQ


 On Wed 09/03/11  6:20 PM , "Richard W. Solomon" w1ksz at earthlink.net sent:
> Why not just beg, borrow or buy a 20 MHz Function Generator ??
> 
> 73, Dick, W1KSZ
> 
> 
> -----Original Message-----
> >From: David Wise David_
> Wise at Phoenix.com>>Sent: Mar 9, 2011 4:20 PM
> >To: "r-390 at m
> ailman.qth.net" r-390 at m
> ailman.qth.net>>Subject: Re: [R-390] Okay, don't laugh at me
> but...>
> >In the 8-16MHz range, the 8640B can only sweep +/-
> 80kHz, which>is not really wide enough to align a broadcast FM
> IF.>
> >I can think of three ways around this.
> >
> >1. Another VHF generator and a mixer.  Tune the
> 8640B to, say,>60.7 and the other gen to 50.  Drift will equal the
> second>generator's drift.  Another 8640B would be great. 
> You can get>by with a 608 if you warm it up
> beforehand.>
> >2. An 11710B Down Converter.  Tune the 8640B to 60.7
> .>
> >3. Amplify the 8640B's 5MHz timebase and mix with
> 8640B output.>Tune the 8640B to 15.7 using underrun on the 16-32
> range.>See Agilent App Note AN171-2, "Extending the 8640B
> Frequency>Down to DC".
> >
> >Dave Wise 
> >
> >>-----Original Message-----
> >>From: r-390-bounces at mailman.qth.net >>[r-390-bounces at mailman.qth.net] On Behalf Of Barry>>Sent: Wednesday, March 09, 2011 1:46 PM
> >>To: r-390 at m
> ailman.qth.net>>Subject: [R-390] Okay, don't laugh at me
> but...>>
> >>I am aligning an old FM radio and I want to sweep
> the IF >>transformers but I don't have a sweep generator.  I
> know that >>my function generators with VCO input can function
> as a sweep >>generator, but they don't cover the 10.7MHz
> range.>>
> >>Here's the dumb question:  Can I use my HP-8640B
> (in FM mode) >>and feed the modulation input with a triangle
> waveform from a >>function generator to essentially cause the 8640 to
> sweep the >>center frequency?
> >>
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