In February Microsemi announced the release of version 8 software
(firmware) for these cards, intended to resolve some problems caused by the GPS
module, which was at one time anyway a Trimble Ace 3.
I have been trying to download this firmware from Microsemi but they no
longer accept my S
I now have a copy of this firmware upgrade courtesy of another list
member, and just wanted to say a public thank you.
Regards
Nigel
GM8PZR
In February Microsemi announced the release of version 8 software
(firmware) for these cards, intended to resolve some problems caused by the
GPS
Is anyone else seeing anthing unusual with the MSF 60KHz signal from
Anthorn?
For the past 24 hours or so, at least, all I've been monitoring here,
approx 100 miles from Anthorn, is what seems to be a much weaker than usual
carrier that's pulsing at significantly faster than once per second
Thanks to all who've commented on this.
All the reports I've received have suggested that MSF is behaving normally
and I've taken a closer look at my antenna system, where I've found more
loss at 60KHz than expected in the multicoupler I've been using.
With this bypassed and a stronger sig
Nick,
This looks very interesting but just wondering, will there be an option
for end users to reprogram the board themselves just in case there does turn
out to be any bugs in the software, and if so would you be making updates
available?
Regards
Nigel
GM8PZR
_
Hi Colin,
All the 5313x counter basic oscillators are indeed extraordinarily poor,
and I've always assumed that their only purpose was to demonstrate that the
unit was basically functional.
A couple of years ago I upgraded a 53132A with serial prefix 3546 from
firmware version 3403 to 461
I have just uploaded this firmware to Didier's (KO4BB) manuals site so it
should be available for download in the near future.
Regards
Nigel
GM8PZR
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How similar are the 131A and the 132A ? Is it possible to upgrade a 131
into 132 ?
---
Interesting question!
I suspect not, not in any straightforward fashion anyway, but I'm sure
others would know better than me.
>From a quick look at the component level service manuals the har
Yesterday I used one of John's excellent TICC modules for the first time
and initially set up a quick test using the 10MHz output from a Thunderbolt
as the frequency reference to measure the 1PPS from an Oscilloquartz Star4
GPSDO, with the TICC output feeding a USB3 port on a Windows 10 PC r
Many thanks for the replies on this, what was initially intended as a quick
"Hello World" test seems to have become far more interesting:-)
I'll forward my results to Tom as requested and see where we go from there.
Nigel
GM8PZR
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I've just uploaded a pdf version of the HP 5090A Ops and Service manual to
Didier's site at.
http://www.ko4bb.com
For now at least it's also available at
https://www.mediafire.com/?u0bf1eips89uo3h
The 5090A was an HP product designed in the UK in the early 1960s and was
an off a
I've just received an Ebay purchased E1938A, haven't tested it yet although
I do have a 14 day return option, but unlike previous purchases of these
the serial number label is missing from the rear of the PCB so I have no
obvious way of knowing if the crystal is matched to the PCB.
Does any
how to make the software do this anymore.
I knew at one time, but have long forgotten.
Rick N6RK
On 4/24/2017 5:41 AM, GandalfG8--- via time-nuts wrote:
> I've just received an Ebay purchased E1938A, haven't tested it yet
although
> I do have a 14 day return option, but unl
r. There was some way to
> then set the oven to this temperature. I don't know if anyone
> currently knows how to make the software do this anymore.
> I knew at one time, but have long forgotten.
>
> Rick N6RK
>
> On 4/24/2017 5:41 AM, GandalfG8--- via
Is anybody monitoring eLoran from Anthorn?
I'm less than 100 miles from the transmitter but an FS700 has been unable
to find the signal for several days. Last time this happened though it
turned out to be a local antenna problem so I didn't want to cry wolf until I
found time to take a clo
Iain Young wrote:
I now have all four with green tracking lights, so looks good to go
Thanks Iain,
Also looking good here now so seems like I cried wolf after all, although
very happy it wasn't anything more permanent:-)
Nigel, GM8PZR
___
tim
Yes, noticed here it was off again and am pretty sure you're right about
maintenance, just don't remember them starting at 0700 in the past:-)
Nigel, GM8PZR
In a message dated 10/05/2017 10:58:31 GMT Summer Time, i...@g7iii.net
writes:
On 09/05/17 20:28, moGandalfG8--- via time-nuts wro
I really don't know just how relevant this might be, but some Brandywine
products are/were rebadged units from Time and Frequency Solutions in the UK,
or perhaps vice versa.
I'm not sure if TFS had an equivalent of the GPS4 but certainly both
companies sold versions of the GPS8 and the TFS
Although there doesn't seem to be anything similar in the GPS4 manual, the
Brandywine GPS8 manual does carry a table of various oscillator options on
page 33.
The OCXOs listed there are either from from Milliren or HCD Research.
Nigel, GM8PZR
Hi,
Does someone happen to know what OCXO sit
Hi Pete
That's quite good timing, if you'll pardon the expression:-), as I uploaded
a pdf version of the 5090A manual to mediafire a couple of months ago
http://www.mediafire.com/file/u0bf1eips89uo3h/HP_5090A_Ops_and_Service.pdf
I know a few others have considered converting the 5090A
be too much of a problem:-)
Nigel, GM8PZR
On 06/18/2017 04:17 PM, GandalfG8--- via time-nuts wrote:> I have a
5090B which I'm hoping to get up and running when it finally
> reaches the top of the to do list and my view is that it would be much
better to
> leave the origina
Hi Clint,
There seems to have been very little information available from Halcyon on
either the OFS or PFS off air references. All I've seen is the OFS
alignment document that Stephen is already sending to you.
There were two versions of the OFS1, the later version had similar
proportions
How about building a frequency converter to produce 200KHz; mixing the
incoming RF (198KHz) with 2KHz derived from the output of the unit,
On 18/06/2017 21:17, GandalfG8--- via time-nuts wrote:
> Hi Pete
That's quite good timing, if you'll pardon the expression:-), as I
uploaded a p
ing to the carrier I wonder if it'd be possible to use a
suitably modified PICDiv clocked from a 'standard' 10MHz GPS locked device
like the Lucent?
On 19 June 2017 at 14:19, GandalfG8--- via time-nuts
wrote:
I suppose a converter from 198KHz could be an option but I know
A friend of mine has bought a just out of calibration R & S XSRM Rubidium
standard from one of the so called "recyclers" on Ebay.
Although the price was good, and it came with the off air receiver, phase
meter, and frequency divider, it looks to have been heavily decommissioned
with delibe
Thanks for the replies to this, both on and off list.
Repairs to the wiring turned out to be fairly straightforward and all now
seems to be basically functional, but there still remains the problem of the
lamp.
I am told that the FRK lamp is not a direct replacement, the base is
smaller,
The PTS250 manual is available from mediafire as either a 55MB standard
pdf file or a 41MB OCR pdf file.
https://www.mediafire.com/file/v8vd4o33d7ta1rd/PTS250.pdf
https://www.mediafire.com/file/5hp2hj1la7wws2s/PTS250%20OCR.pdf
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The Programmed Test Sources PTS-x10 manual is available from Mediafire
http://www.mediafire.com/file/ak193b371mbb3vc/PTS_X10.pdf
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Does anyone have a service manual or any information on the
Europeanlectronics Systems (EES) Radio Clock Model 100.
The company was part of Siemens but closed down in 2005.
The Model 100 was supplied by Plessey Defence Systems to the UK military.
Some models could be GPS disciplined
Any infor
e for accounting
purposes and not the engineering / production location).
I have several model 100 units and was just about to put one in a timing
rack at the museum.
Regards
Steve G8EBM
Original Message
Subject: [time-nuts] European Electronics Systems Radio Clock Model 100
From: G
Hi
The CSAC spec sheet calls out an aging rate of 0.9 ppb per month as
“typical”. There is also a temperature spec of 0.4 ppb. If both are correct
for your sample (*and* aging is linear ) you would be out by roughly 10 ppb
per year. There also is a voltage stability spec that might be impacted
Crazy thought.Could you just force a DC offset into the EFC assuming the
internal varicap is not out of range.
It would be simply adding a resistor to pull up or down to see if you can
get a bit of pull and allow the dac to move back in range a bit. Its a band
aid.
I know its sort of crazy. Bu
Is this auction # 273145006434, actually showing at $9.77 here in the UK, and
from a recently registered zero rated seller?
If so, and given that the auction text, and perhaps the photos too, seem to be
taken from one or more of Bob Mokia's
auctions dating back a couple of years or so, and th
Unless I copied the number incorrectly earlier it does seem likely that Ebay
has pulled that auction.
It may still be showing up to those who "bought" them but a straight search on
that number returns nothing,
either in completed or running listings, nor does it show up now in searches
for "Tri
I've had one of the cheap TruePosition GPSDOs running here for the past week,
this is the earlier version with the Bliley oscillator, and as Mark reported
have been seeing what I consider to be excessive holdover reports from Lady
Heather.
At 55 degrees north the number of Sats visible can be a
Today using Lady Heather I have observed the TruePostion GPSDO dropping into
holdover as the number of tracked sats dropped from four to three.
There does seem to be some hysteresis in the system though, the number of
tracked sats eventually dropped to two and then the unit came out of holdover
Ok, I give up
I've been logging this with Lady H and was watching again this afternoon as
the sat count dropped but this time there was no dropping into holdover as the
number of sats dropped from four to threedamn, it just carried on doing its
thing until the count went up again:-)
I
The location at 55N, 5W, isn't ideal, there's quite a large hole to the north
but this isn't something I've seen here before with any other GPS module or
GPSDO.
When first noticed I'm sure it was whilst tracking six or seven sats, it was
certainly five or more, which is why I commented in the f
op in very quickly ( a
second or two), but come
out slowly ( many minutes). Local noise can in some cases be enough to put you
in holdover.
Bob
> On May 13, 2018, at 1:13 PM, gandalfg8--- via time-nuts
> wrote:
>
> The location at 55N, 5W, isn't ideal, there's quite
omething like this might be akin to watching grass grow:-)
Nigel, GM8PZR
-Original Message-
From: Bob kb8tq
To: gandalfg8 ; Discussion of precise time and frequency
measurement
Sent: Tue, 15 May 2018 17:44
Subject: Re: [time-nuts] TruePosition GPSDO Holdover Issues
Hi
If you a
Hi Hal, and thanks for that.
In my case at least there's no problem with making plots from live data as Lady
Heather will do that for me,
it's just the time taken to collect the data for each plot that could be an
issue.
I'd just been wondering aloud whether any of the online simulations for
This is a nice GPSDO but there doesn't seem to be too many about these days
compared with the earlier Bliley version, and searching the usual channels from
the UK currently seems to brings up just one, Ebay ref 152981122366.
39.99 USD is a pretty good price, and despite being described as used
I have a Tek FCA3103 300 MHz counter that measures ADEV
as a built in function. When I bring up the settings
menu for the measurement, it has an entry window for
"tau" (the averaging time, IE "sigma sub y of tau").
It defaults to 200 ms. I can enter larger values and
ADEV gives reasonably resu
Perhaps not a very common item, and probably restricted to the UK, but I have
seen these mentioned here before.
The 607B was a very nice 2 to 30MHz synthesiser used as the drive unit in the
UK Diplomatic Service Piccolo radio system.
Both Sayrosa and Piccolo are long gone, and information has a
This is probably now well past its sell by date but over the years there have
been a number of requests here for schematics of the Spectracom 8140T Line Taps
as used with the 8140 Frequency Distribution Amp.
The standard reply has always been that no schematics were available from
Spectraco
nly make darn sure they had headers fitted before being returned
to the box!
Nigel, GM8PZR
-Original Message-
From: Julien Goodwin
To: gandalfg8 ; Discussion of precise time and frequency
measurement
Sent: Thu, 14 Jun 2018 11:36
Subject: Re: [time-nuts] Spectracom 8140T Line Tap
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