[time-nuts] Meter face for HP-4805A

Tue Oct 12 13:29:19 UTC 2010

Didier,
Its subjective then. If its bad enough you take the risk because you do know
the process will degrade the scale. Essentially when its time to do it you
will.
So the good news is this. With todays tools you can very accurately
reproduce the meter scale. I scan them at 1200 dpi as I just did for the
dymec. I prefer bitmap over jpeg for storing them.

Additionally with the various paint programs that seem to come on every pc
today you can always fix issues pretty easily. Then print to your favorite
material which most likely is a white picture material. (I like it because
its a bit thicker and more stable) Though good quality paper
is excellent also.

Hmmm maybe we should send our meter scans to K4BB repository. Heck he has
rom images.
Regards Paul.

On Tue, Oct 12, 2010 at 9:06 AM, <shalimr9 at gmail.com> wrote:

> I have an HP-4508A Vector Voltmeter that has a bad case of meter paint
> peeling. I took pictures to have in case it gets worse (which it probably
> will), but I am concerned that any attempt at taking the meters apart (as I
> would need to actually scan the meter faces directly on the scanner to have
> a scale image without to much distortion) would result in most of what's
> left of the paint to fall off.
>
> This probably should go on the HP_Agilent news group, but I was wondering
> if someone in this group had experience with rebuilding those or similar
> meters.
>
> Didierr
>
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: paul swed <paulswedb at gmail.com>
> Sender: time-nuts-bounces at febo.com
> Date: Mon, 11 Oct 2010 20:22:32
> To: <billj at ieee.org>; Discussion of precise time and frequency
> measurement<time-nuts at febo.com>
> Reply-To: Discussion of precise time and frequency measurement
>        <time-nuts at febo.com>
> Subject: Re: [time-nuts] Possibly OT - Any interest in a vintage HP/Dymec
>  DY-5842 VLF receiver?
>
> Thanks Bill the scale is fine. Its the meter needle that had paint peeling
> off.
> Just pulled the meter and removed the loose paint. Also just scanned the
> meter face so in the crazy possibility of the decals peeling I can just
> print a new face.
> Now to locate a hobby store (that may actually be really tough these days.)
> and find some enamel paint of approx correct color.
> Kind of a florescent red and really a little dab will do you.
> Regards
> Paul.
>
> On Mon, Oct 11, 2010 at 11:22 AM, Bill Janssen <billj at ieee.org> wrote:
>
> > paul swed wrote:
> >
> >> An update. Indeed its working very well now. Easily at -88dbm. Its quite
> >> interesting in the fact that if you set the Local oscillator exactly at
> >> 160
> >> KC which today is easy to do, you actually have mis-adjusted it. It
> dawned
> >> on me this morning that since its a freq LO add and then subtract
> scheme.
> >> That you actually adjust it for peak signal through the 100KC IF.
> >> Essentially disregarding slight literal offsets. (This is the same
> >> approach
> >> some navy receivers use back in the 70s, and some older ham equipment.)
> >> The unit cleaned up very well though still have some tape glue to remove
> >> and
> >> label gunk from stickers.
> >> The biggest challenge is gently pulling the meter out and removing the
> >> peeling needle paint thats jamming the needle. No coffee during that
> >> exercise.
> >> Regards
> >> Paul.
> >>
> >>
> > I have had some success with putting the meter scale back down with
> water.
> > It seems on some meters
> > that the scale was a decal that had a water based glue. I used a tooth
> pick
> > to put a drop of water under
> > the part that was lifted and the used the tooth pick to smooth the scale
> > back in place.
> >
> > Bill K7NOM
> >
> >  On Mon, Oct 11, 2010 at 1:09 AM, Paul Davis <ziggy9 at pumpkinbrook.com>
> >> wrote:
> >>
> >>
> >>
> >>> In case anyone was wondering, the receiver has found a home with Paul,
> >>> WB8TSL. He tells me he's got it receiving WWVB already. It will need a
> >>> little TLC, but it was good to see its basic functionality confirmed.
> >>>
> >>> I've posted the scanned copy of the manual on my website at <
> >>> http://www.pumpkinbrook.com/DY-5842/> for those that are interested.
> >>>
> >>> Thanks for the interest, and the replies.
> >>>
> >>> Paul - K9MR
> >>>
> >>>
> >>> On Oct 2, 2010, at 2:40 PM, Pete Lancashire wrote:
> >>>
> >>>  Ken would be a great person. THe HP Memory project would be another
> >>>
> >>>
> >>>> http://www.hpmemory.org/index.htm
> >>>>
> >>>> -pete
> >>>>
> >>>> On Fri, Oct 1, 2010 at 3:50 PM, Brian Kirby <
> >>>> kilodelta4foxmike at gmail.com>
> >>>> wrote:
> >>>>
> >>>>
> >>>>
> >>>>> You might consider contacting Dr. Ken Kuhn  --
> kennathakuhn at gmail.com
> >>>>>
> >>>>> check his HP museum at http://www.kennethkuhn.com/hpmuseum/
> >>>>>
> >>>>> Brian Kirby KD4FM
> >>>>>
> >>>>>
> >>>>>
> >>>>> On 10/1/2010 5:34 PM, ziggy9 wrote:
> >>>>>
> >>>>>
> >>>>>
> >>>>>> Fellow time-nuts:
> >>>>>> I've got a circa 1964 DY-5842 VLF receiver. This is (was) operated
> in
> >>>>>> conjunction with an external time interval counter to make a
> frequency
> >>>>>> comparison. So you would select WWVL for example, and use that as
> your
> >>>>>> primary standard for comparison to your local standard. It's got 5
> >>>>>> crystals
> >>>>>> in it: 16, 18, 19.8, 20, and 60 kHz (listed as GBR, NBA, NPM, WWVL,
> >>>>>> WWVB).
> >>>>>> It works and I have the manual. The thing is, the interest in
> >>>>>> something
> >>>>>> like this is bound to be a bit narrow, so I thought I'd mention it
> >>>>>> here.
> >>>>>>
> >>>>>> So if there are any collectors, equipment museums, etc. that might
> be
> >>>>>> interested in this, please let me know. I'm a bit sentimental about
> >>>>>> this
> >>>>>> thing, it's sort of a bit of history, and from what I can tell,
> >>>>>> somewhat
> >>>>>> rare (doesnt make it worth anything though :). Since it's a bit of a
> >>>>>> curiosity, I'd like to pass it to someone that might be interested
> in
> >>>>>> it
> >>>>>> rather than just tossing it. I can always provide more details to
> >>>>>> anyone
> >>>>>> that wants them.
> >>>>>>
> >>>>>> Best regards,
> >>>>>> Paul Davis - K9MR
> >>>>>>
> >>>>>>
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