[time-nuts] HP 5372A

Dana Whitlow k8yumdoober at gmail.com
Fri May 11 14:21:13 EDT 2018


When I was working at the Arecibo Observatory and we were running the
ionospheric heater
at 5.1 MHz (think Mini-HAARP), I'd sometimes go home (about 3 miles away)
and listen to the
signal there.    There was frequently substantial random fading of the
signal, suggesting that I
was hearing the vector sum of an NVIS signal off the ionosphere and the
usual sidelobe leakage
from the dish.  Said fading could be said to have a characteristic period
of around 1 or 2 seconds,
and was occasionally quite deep.

So, I'm definitely a believer in short path propagation variations.

Dana   K8YUM


On Fri, May 11, 2018 at 1:09 PM, Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> Well, having actually run FMT virtually “in the back yard” of the
> transmitting station …. it’s surprising
> what 70 miles will do. In this case, back yard really does mean on the
> premises. There is a lot that
> gets into even fairly sort distance propagation.
>
> Bob
>
> > On May 11, 2018, at 1:52 PM, Jerry Hancock <jerry at hanler.com> wrote:
> >
> > If you were in Connie’s back yard or had a very stable ground wave, then
> yes, you could automate the testing.
> >
> > There are a number of challenges with this method as looking at the data
> with a simple graph will tell.  You might have large fluctuations on the
> high frequency side only, for instance, that any averaging or algorithm
> would assume to be valid data.
> >
> > The next issue is the length of the dataset as the key-down time is only
> a few minutes so you end-up with not that many samples.
> >
> > Regards,
> >
> > Jerry
> >
> >> On May 10, 2018, at 5:59 AM, Don Murray via time-nuts <
> time-nuts at febo.com> wrote:
> >>
> >> Hi Magnus...
> >>
> >>
> >> Appreciate any help!
> >>
> >> I participate in the ARRL Frequency Measuring Test,
> >> and I would like to automate the measuring process.
> >>
> >> I have two frequencies, A and B...
> >>
> >> A is a GPS locked HP 3336B set to 455,000.000 Hz
> >>
> >> I use the 3336B instead of the 455,000Hz BFO
> >> signal from my GPS locked Racal receiver so
> >> that I can measure AM stations without the
> >> annoying beat note.  ;-)
> >>
> >> B is an IF signal which should appear between
> >> 455,000.000Hz and 455,001.000 Hz
> >>
> >> I would like the 5372A to calculate the B minus A
> >> delta, over a manually started and automatically
> >> stopped measurement period of 110 seconds.
> >>
> >> I would like a delta resolution of 0.001Hz to be
> >> developed by the box.
> >>
> >> Now, there will be doppler.  I want the box
> >> to analyze and give me a best statistical guess
> >> for the B minus A delta.
> >>
> >> BTW the B minus A delta will be added to the
> >> frequency of my Racal receiver to give me the
> >> best "guess" as to the correct frequency of the
> >> target signal.
> >>
> >> The Racal reads out to the Hz, and I am able to
> >> accurately determine if the Racal is tuned above
> >> or below the "target" frequency.
> >>
> >> I will be tuned below the "target" and within
> >> 1 Hz of the "target."
> >>
> >> I assume I will be in the one frequency mode.
> >>
> >> Can the box give me the desired resolution?
> >>
> >> What sampling period would be the best to use?
> >>
> >> What statistical result would I use as my delta?
> >>
> >> Appreciate your help.  My head is spinning whenever I
> >> get into the operating manual!
> >>
> >> TNX...
> >>
> >>
> >> 73
> >> Don
> >> W4WJ
> >>
> >> In a message dated 5/10/2018 2:19:49 AM Central Standard Time,
> magnus at rubidium.dyndns.org writes:
> >>
> >>
> >> Hi,
> >>
> >> What issues do you have?
> >>
> >> Cheers,
> >> Magnus
> >>
> >> On 05/08/2018 02:32 AM, Don Murray via time-nuts wrote:
> >>> Hello Time Nuts...
> >>>
> >>>
> >>>
> >>> Who is the resident expert on the HP5372A?
> >>>
> >>> I have some operational questions.  ;-)
> >>>
> >>> email off list please.  w4wj at aol.com
> >>>
> >>> TNX all...
> >>>
> >>> 73
> >>> Don
> >>> W4WJ
> >>>
> >>>
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