Hi
> On Jan 16, 2016, at 7:29 PM, Nathan Johnson <[email protected]> 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 > > Sent using CloudMagic Email > [https://cloudmagic.com/k/d/mailapp?ct=pi&cv=7.4.15&pv=9.1&source=email_footer_2] > On Sat, Jan 16, 2016 at 19:32, Discussion of precise time and frequency > measurement <[email protected]> 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" > <[email protected]> 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 > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > > > > -- > > If this email is spam, report it to > > > https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg0MzQzODAwNjpyb2JAbmMwYi5jb206ZGVsaXZlcmVk > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
