[time-nuts] New Member + Basic Questions

Bob Camp kb8tq at n1k.org
Sun Jan 17 09:49:22 EST 2016


Hi



> On Jan 16, 2016, at 7:29 PM, Nathan Johnson <jdownj at gmail.com> wrote:
> 
> Right now I'm mostly aligning IF stages of boat anchor rigs, not designing new
> stuff or trying to evaluate performance of newer rigs, so I think the 8660 will
> do the job until I can afford something better. I'm debating what to buy later,
> but it appears most of the older rigs with better specs and that are well-liked
> here start at $500(It "powers on") to $1000(Tested and calibrated) and can
> easily go as high as one wants to spend on newer gear. I'm sure I will wind up
> that far into the hobby... Just not yet! I appreciate all the information from
> the group, I'm learning a lot.
> Nathan KK4REY

Consider that what you have right now may be “good enough” for anything you
are likely to do with it. You only *need* to get a different gizmo when you have an
application that is beyond what you can deal with now. Yes, gear is cheaper if you 
shop for a year for that “bargain”. You can also wind up with a shed full of gear (or 
possibly three sheds …) going for each deal that comes along. 

Bob


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> On Sat, Jan 16, 2016 at 19:32, Discussion of precise time and frequency
> measurement <time-nuts at febo.com> wrote:
> I did some interpolation to compare the specs for phase noise of the 8660 the
> way it was done then to the present method. I think it is going to be something
> like -105 dBc/Hz to -110 dBc/Hz at 10 kHz offset at 14 MHz carrier frequency.
> 
> As a comparison, the 8662A is about -135 dBc/Hz and the 8642A is better than
> -150 dBc/Hz.
> Actual measurements on multiple generators in my lab. Unfortunately I have never
> used or measured an 8660.
> 
> 3335A -128 dBc/Hz
> 3336C -120 dBc/Hz
> 3325A -115 dBc/Hz (original version. Later improved by 4 pr 5 dB after the 3336C
> came out.)
> 
> As a comparison a Rigol DG4162 is -115 dBc/Hz
> All at 10 kHz offset and on the 20 meter band.
> 
> It depends what you are trying to measure. Sensitivity or noise floor, anything
> will work within the range of specified output accuracy and leakage. On the
> other hand, if you are trying to measure the dynamic range of a receiver, or its
> phase noise characteristics, you cannot do that with most generators.
> 
> Rob, NC0B
> 
> 
> 
> 
> Sent from my iPad
> 
> > On Jan 16, 2016, at 3:10 AM, "Richard (Rick) Karlquist"
> <richard at karlquist.com> wrote:
> >
> >
> >
> >
> >
> >> On 1/14/2016 12:35 PM, Nathan Johnson wrote:
> >> What does the group think of the HP 8660? Just scored a broken one too cheap
> to
> >> pass up. I know it's not gonna be the last signal generator I buy, but for
> under
> >> $100 shipped it should be an interesting project.
> >> Nathan KK4REY
> >
> > When I worked at HP, I had the chance to discuss this product
> > with various engineers who were involved in its development.
> > It frankly wasn't one of the better products in the line.
> > It has a high broadband noise floor. The follow on
> > product, the 8662, is MUCH better. No comparison.
> >
> > Rick Karlquist N6RK
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