[time-nuts] Re: eLoran

[R&M Putz]

To Paul and John;
I have a 2000 and a 2004 which is a 2000 with a built in strip chart recorder!
Regards,
Rich
W9ENG

----- Original Message -----
From: <time-nuts-request at lists.febo.com>
Reply-To: <time-nuts at lists.febo.com>
To: <time-nuts at lists.febo.com>
Sent: 5/28/2023 3:30:23 AM
Subject: time-nuts Digest, Vol 229, Issue 29
________________________________________________________________________________


Send time-nuts mailing list submissions to time-nuts at lists.febo.com To subscribe or unsubscribe via email, send a message with subject or body 'help' to time-nuts-request at lists.febo.com You can reach the person managing the list at time-nuts-owner at lists.febo.com When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics:    1. Re: E-Loran tests (paul swed)    2. HP 5061A HVPS repair (vilgotch1 at gmail.com) ---------------------------------------------------------------------- Message: 1 Date: Thu, 25 May 2023 12:10:42 -0400 From: paul swed <paulswedb at gmail.com> Subject: [time-nuts] Re: E-Loran tests To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com> Message-ID: <CAD2JfAhLjzJS6N9Zwrt38UZQU+tUjnmAR2Ejs08MMUNg-ZJJJw at mail.gmail.com> Content-Type: text/plain; charset="UTF-8" John great to hear.
The 2100f does not have a hard coded GRI. Its entered on the front panel on
the unit at start up.
At least thats the way my unit works. I also have a 2100 that operates the
same and with humor I think you and I are the only ones with a 2000. Though
its no longer racked.
Regards
Paul
WB8TSL

On Thu, May 25, 2023 at 11:20 AM JOHN HARTZELL via time-nuts <
time-nuts at lists.febo.com> wrote:

> Legacy Loran-C receivers will work just fine receiving e-Loran (LFPhoenix)
> signals , providing the on air testing is of a GRI that is hard coded into
> your 1970  Austron 2100F.  The additional data will not affect a Loran-C
> receiver.  I have locked on using my Austron 2000C-1, no problem.
>
> Maybe consider contacting Ursa Navigation and buying one of their state of
> the art 2023 receivers.
>
> Kind regards,
>
> John
>
> https://linkedin.com/in/john-h-6a131b12/
>
>
>
>
> > On May 24, 2023, at 12:43 PM, Jeff Huselid via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > Greetings,
> >    Anyone have more info on the E-Loran tests in progress? Which station
> is master, power levels, coding delay, etc? I am trying to receive using my
> Austron 2100F, I think maybe it doesn’t like the additional added data.
> Worked well on the old system.
> > Jeff H.
> >
> >
> >
> >
> >
> > Best regards,
> > Jeff Huselid
> > Valley Communication Engineering
> > 3145 South De Wolf Avenue
> > Fresno, CA 93725
> > Phone 559 268 3311
> > Fax 559 233 3414
> > Dun & Bradstreet DUNS 36-334-2460
> > Precision Services Since 1977
> >
> > ITAR COMPLIANCE ALERT
> >
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------------------------------ Message: 2 Date: Sat, 27 May 2023 22:57:30 +0000 From: "vilgotch1 at gmail.com" <vilgotch1 at gmail.com> Subject: [time-nuts] HP 5061A HVPS repair To: time-nuts at lists.febo.com Message-ID: <emeccaa2da-3231-4a74-83fa-d1608ff5cdf6 at e1bf1122.com> Content-Type: text/plain; charset=utf-8; format=flowed Hi all,

  I have a HP 5061A with a working physics package and run it in Cs mode 
every now and then. Recently it wouldn't start and the problem was that 
the +3500 volt A18 unit was not producing its "power good" signal from 
pin 4. I therefore had to fix it.

The +3500 ( ion pump supply A18) and -2500 (electron multiplier supply 
A19) supplies are similar modules and are housed in sealed cans that are 
soldered shut. There is a soldered-on cap over a filler hole, possibly 
to fill the unit with inert gas. The circuits consist of a blocking 
oscillator running at about 1 KHz feeding a small power transistor that 
pulses the primary of a tuned transformer running at about 20 KHz. The 
secondary voltage is fed to a half wave doubler of appropriate polarity, 
the final capacitor of which is 0.01 uF. There is a voltage 
divider/bleeder consisting of a 200 Meg HV resistor and lower value 
resistors. The supply is free running with no voltage feedback. The 
bleeder time constant is 2 seconds so it should usually be safe to work 
on the HV section after about 10 seconds. The whole thing works from the 
+18.7 volt DC supply in the 5061A.

To get to the circuitry I gently heated the can with a small gas torch 
until the solder melted and I was able to pull out the innards. I set it 
up on the bench and applied 18.7 volts but no output was present on pin 
4. It soon became obvious that the problem was R4, a faulty 200 Meg 
resistor which was open. Replacing it cured the problem. Fortunately 200 
Meg HV resistors are not too hard to find on the usual auction site.

There are a couple of gotchas I need to mention:

1. If there is no output on pin 4 don't assume the oscillator section is 
not working. An open R4 will prevent any voltage reaching pin 4 and will 
also prevent any bleeder action. That 0.01 uF cap will hold the HV for a 
long time. Don't ask me how I know this!

2. The HV output and the oscillator 18.7 volt supply are both  
referenced to the chassis ground but connected separately. When testing 
the unit out of the 5061A you need to connect the negative 18.7 volt 
terminal (pin 2) to the chassis. I'm not sure why HP did this and the 
schematic was a bit confusing to me with different ground symbols in 
different parts of the circuit. The thing will run if you don't connect 
it this way but the voltage readings don't make sense.

I no longer have access to a source of dry nitrogen but I don't think 
the lack of it will make much difference.

Finally I have a question. My A18 unit produces a bit more than +3500 
volts. It's about +3850. Is this a problem and will it harm the Cs tube?

Regards to all,

Morris
------------------------------ Subject: Digest Footer _______________________________________________ time-nuts mailing list -- time-nuts at lists.febo.com To unsubscribe send an email to time-nuts-leave at lists.febo.com %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s ------------------------------ End of time-nuts Digest, Vol 229, Issue 29 ******************************************