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

[Richard W. Solomon]

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 mailman.qth.net" <r-390 at mailman.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 
>>[mailto:r-390-bounces at mailman.qth.net] On Behalf Of Barry
>>Sent: Wednesday, March 09, 2011 1:46 PM
>>To: r-390 at mailman.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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