[time-nuts] FA-2 questions

[Didier Juges]

HP8656 and spectral purity should not be used in the same sentence. I had
one and the best band is VHF where it may be usable for SSB or NBFM if you
are not too picky. It gets worse from there going up. The worst is the
lower band (HF) because it is actually the high band mixed down.

http://www.ko4bb.com/getsimple/index.php?id=comparing-the-hp-8656a-hp-8657b-and-hp-3586a


Didier KO4BB

On Sat, Oct 12, 2019 at 10:07 PM David <mcquate at sonic.net> wrote:

> The hp8656 spectral purity may be a problem.  Residual FM for output
> frequencies above 494MHz is < 15 Hz rms ( 0.3 to 3 kHz BW ).  (The B
> version is better by about a factor of 2)
> Dave
>
> Perry Sandeen via time-nuts <time-nuts at lists.febo.com> wrote:
>
> >Yo Bubba Dudes!,
> >First, does the internal OCXO run when the power is turned off?
> >Wrote:
> >We are presently experimenting using a ISC570B  multiplier at 100 MHz
> >and get 13 digits seeattached but the data out of the back is only 12
> >digits reliable.
> >Looking it up I found out that the ISC570B is a teeny - tiny IC which
> >for me would pose a problem to implement.
> >
> >So looking at alternatives that I already had I came up with two
> >possible alternative multiplier ideas.
> >The first was to put the 10 MHz DUT into the external reference of my
> >(boat anchor) HP signal generator set the output frequency to 200 MHz
> >and put the output into the channel 1 input to get extra resolution
> >digits.
> >Expanding upon that, I came with more complex but what may be a better
> >error multiplier reading since I have both signal generators on hand.
> >First I feed the 10 MHz DUT signal into my Fluke 6080 setting the
> >output to 1 GHz.  I'd then feed the reference 10 MHz signal into the
> >external reference of my HP 8656 and set the output to 990 MHz.
> >Next I'd feed both outputs into a
> >AD8342 LF to 3.8GHZ Active Mixer Down conversion Output withBalun
> >Transformer
> >
> >board from ebay ($23) and then feed the multiplied signal into channel
> >1. (I may need a simple low pass filter.)
> >
> >
> >This should give me a 100X error multiplication.
> >
> >
> >Am I on the right track or am I missing something?
> >
> >
> >Regards,
> >Perrier
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >_______________________________________________
> >time-nuts mailing list -- time-nuts at lists.febo.com
> >To unsubscribe, go to
> >http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> >and follow the instructions there.
>
>
> Sent with mySecureMail.
> http://www.mysecurephone.eu/
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>