[time-nuts] HP Stories: Frequency Counter business

[paul swed]

Been seriously enjoying the discussion. Especially the insights of HP. I
have several 5245 and 5248Ms (Better oven osc)
Just had to do a few minor repairs over Christmas. That said the binary
counter to nixie decoders are just a crazy engineering marvel. Neon bulbs
light that change a photo cell that illuminates the nixie number. I have
seen the 52X series long ago and stayed clear of them.
But this winter they may have been helpful in keeping warm.
Keep sharing.
Regards
Paul
WB8TSL

On Mon, Jan 21, 2019 at 7:04 PM Don <dlewis6767 at austin.rr.com> wrote:

> http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1951-01.pdf
> On Mon, 2019-01-21 at 14:15 -0500, Gordon Batey wrote:
> > Greetings to all,
> >
> > I believe that was the HP 525 counter.  I had one as my first
> > counter
> > which I picked up surplus many years ago.  It had several plug-ins
> > for
> > different
> > frequency ranges.  Kept the basement warm in the winter time.  The
> > vhf
> > plugin was a heterodyne mixer as I recall.  This unit ontained MANY
> > tubes
> > and a
> > fairly large fan to remove the heat.  I gave it to another ham
> > several years
> > ago.
> >
> >
> > I really enjoy the HP stories.
> >
> > Gordon Batey
> > WA4FJC
> >
> >
> >
> > Hi,
> > I used an HP counter in 1961 that had these vertical strings of neon
> > tubes
> > behind numbers, and the two least significant decimals were read off
> > two
> > milliamp meters numbered 0 to 10. For each count the needles would
> > point to
> > the number to be read. The whole instrument was a 2 foot cube that
> > sat on a
> > trolley.
> > After all this time I can not remember the model number. Our company
> > repaired Air force instruments and recalibration of frequency
> > ?meters?
> > (calibrated heterodyne oscillators).
> > Cheers,
> > Neville Michie
> >
> >
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