Re: eLoran
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@lists.febo.com
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To: time-nuts@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@lists.febo.com To subscribe or unsubscribe via email, send a message with subject or body 'help' to time-nuts-request@lists.febo.com You can reach the person managing the list at time-nuts-owner@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@gmail.com) ---------------------------------------------------------------------- Message: 1 Date: Thu, 25 May 2023 12:10:42 -0400 From: paul swed paulswedb@gmail.com Subject: [time-nuts] Re: E-Loran tests To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com Message-ID: CAD2JfAhLjzJS6N9Zwrt38UZQU+tUjnmAR2Ejs08MMUNg-ZJJJw@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@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
On May 24, 2023, at 12:43 PM, Jeff Huselid via time-nuts <
time-nuts@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
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------------------------------ Message: 2 Date: Sat, 27 May 2023 22:57:30 +0000 From: "vilgotch1@gmail.com" vilgotch1@gmail.com Subject: [time-nuts] HP 5061A HVPS repair To: time-nuts@lists.febo.com Message-ID: emeccaa2da-3231-4a74-83fa-d1608ff5cdf6@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:
-
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! -
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
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