[time-nuts] HP-3586B SSB L.O. Mods...

[paul swed]

Interesting because its going to be very hard for spec lab to do it. I
experimented tonight and the results were not good.
What I can say is the 3586 is stable to spec labs resolution.

On Mon, Mar 21, 2011 at 7:43 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> I forget exactly which programs do which, but there are some free spectrum
> analysis programs that will get you way into the sub-Hz resolution with an
> <=8 KHz sample rate.
>
> Bob
>
>
> On Mar 21, 2011, at 5:44 PM, paul swed wrote:
>
> > It can actually be calculated and it is in Berts tables.
> > But last night I used spectrum lab and and could see the difference
> between
> > usb worse case.5 Hz and LSB .3Hz. It was very stable no drifting at all
> > while tuned to wwvb. But spectrum lab was not really optimized to give me
> > better detail. Sub Hz res. Need to figure out how you would do that
> actually
> > and maybe you simply can't.
> > Regards
> > Paul
> > WB8TSL
> >
> > On Mon, Mar 21, 2011 at 5:29 PM, Burt I. Weiner <biwa at att.net> wrote:
> >
> >> Bert,
> >>
> >> This looks very interesting.  Have you been able to determine the actual
> >> error between the receiver's "tuned to" frequency and the 1850.000.00 Hz
> >> audio tone error out of the receivers audio for upper and lower SSB?
>  This
> >> could make a good group project kit.
> >>
> >> Burt, K6OQK
> >>
> >>
> >> Date: Mon, 21 Mar 2011 10:11:04 -0700 (PDT)
> >>> From: "Bert, VE2ZAZ" <ve2zaz at yahoo.ca>
> >>> To: time-nuts at febo.com
> >>> Subject: Re: [time-nuts] HP 3586A/B/C entirely referenced to 10MHz: A
> >>>       solution
> >>> Message-ID: <258386.19056.qm at web112008.mail.gq1.yahoo.com>
> >>> Content-Type: text/plain; charset=us-ascii
> >>>
> >>> Hello Everyone,
> >>>
> >>> I have spent the last few weeks modifying the HP 3586 Selective Level
> >>> Meter. The
> >>> intent was to modify the unit and reference the SSB product detector
> stage
> >>> to
> >>> the internal reference. This would make the entire SLM locked to the
> 10MHz
> >>> reference, whether internal or externally fed.
> >>>
> >>> I have completed the modification with satisfactory results. I use a
> >>> DDS-Based
> >>> Function Generator 16-pin IC and a small 8-pin PIC micro.  For more
> >>> detail,
> >>> visit my website at http://ve2zaz.net/HP3586_AD5962/HP3586_AD5962.htm.
> >>>
> >>> This has been a very good exercise from a DDS perspective and I have
> >>> learned a
> >>> lot on the topic. I would be interested in hearing from those who
> proceed
> >>> with
> >>> the mod.
> >>>
> >>> Thanks,
> >>>
> >>> Bert, VE2ZAZ
> >>>
> >>
> >> Burt I. Weiner Associates
> >> Broadcast Technical Services
> >> Glendale, California  U.S.A.
> >> biwa at att.net
> >> www.biwa.cc
> >> K6OQK
> >>
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