Re: [time-nuts] unidentified HF time pips

[Scott Armstrong]

Hi Graham,

I am listening to one of those "time pips"  on 30m right now. (1714 utc
02/05/2018).
Frequency is 10.105.

The best I can tell with my calibrated ears and eyes, it appears to be in
sync with WWV. Signal strength is about a s6-7.

I also heard this on Saturday 02/03/2018  about the same frequency but
later in the day.

-Scott AA5AM
EM13sg - Blue Ridge TX

On Sun, Feb 4, 2018 at 4:31 PM, Graham  wrote:

> For some time there have been occasional reports of time pips on a number
> HF frequencies other than the well known CHU, WWV, (etc...) signals.
>
> For example 10140, 10145, 7040, 7065, 7105, 7120 kHz and likely others.
>
> The pips are approximately 15 to 16ms in duration and appear to locked to
> UTC but unlike WWV or CHU they are continuous minute by minute.
>
> Assuming the pips are synchronized to UTC, simply time of arrival with all
> of its issues on HF plus signal strength seems to indicated a source in
> North America.
>
> The frequencies and time of activity might indicate that it is some
> amateur radio operator playing around  but it might not be, the amateur
> 10MHz frequencies is shared with other users. The pips seem to be
> transmitted at a fairly high power level.
>
> I know there is ongoing testing of eLoran and other initiatives
> researching GPS backup systems.
>
> Anyone aware of any group doing any such testing which might be found on
> HF like this?
>
> cheers, Graham ve3gtc
>
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Re: [time-nuts] Looking for info on Trimble 16634-10

[Scott Armstrong]

Hi Guys,

Found a little info..

The main board/receiver used in this unit is also used in the Trimble
Placer 100 and RefTek 73A.
Hopefully, these two leads may develop into some useful info.

Thanks,
Scott AA5AM

On Tue, May 23, 2017 at 6:59 AM, Bob kb8tq <kb...@n1k.org> wrote:

> Hi
>
> Yet again another quick read mistake :)
>
> Bobb
>
> > On May 23, 2017, at 7:35 AM, Tim Shoppa <tsho...@gmail.com> wrote:
> >
> > Bob, that was 16.368MHz, an extremely common crystal to find in the first
> > couple generations of GPS receivers. 16.368 MHz is 16 times the 1.023 MHz
> > C/A GPS signal chipping rate; multiplied by 96.25 to get the 1575.42 MHz
> L1
> > frequency and multiplied by 75 to get the 1227.60 MHz L2 frequency.
> >
> > Tim N3QE
> >
> > On Tue, May 23, 2017 at 7:24 AM, Bob kb8tq <kb...@n1k.org> wrote:
> >
> >> Hi
> >>
> >> If you guess that the design started in 90 and ran through 93~94 that
> >> is a very early unit for Trimble. 16.384 MHz suggests some sort of
> telecom
> >> or data bus application.
> >>
> >> Bob
> >>
> >>> On May 22, 2017, at 11:48 AM, Scott Armstrong <aa...@vntx.net> wrote:
> >>>
> >>> Hi Guys,
> >>>
> >>> I popped open the case.  Not too crowded in side. The case is an
> extruded
> >>> aluminum case that has the back endplate  welded on.
> >>>
> >>> There are 4 board assemblies in the case.
> >>>
> >>> *Interface board that connects the 22 pin connector to the other two
> >> boards.
> >>> * Power supply board. (12016-00). Main component looks to be a DC-DC
> >>> converter made by Computer Products.
> >>> * Main board (14636-)  This board has a 16.368 MHz osc made by NDK.
> >>> * A daughter board (14789E) which is the receiver and is attached to
> the
> >>> main board.
> >>>
> >>> Date codes I see are 89, 91, 92 and 93  so unit was probably assembled
> in
> >>> '93.
> >>>
> >>> Maybe some of the assembly numbers will be recognizable if they are
> used
> >> in
> >>> other units.
> >>>
> >>> Thanks,
> >>> Scott AA5AM
> >>>
> >>>
> >>> On Sat, May 20, 2017 at 12:33 AM, Bill Hawkins <bill.i...@pobox.com>
> >> wrote:
> >>>
> >>>> FWIW, that looks like aviation equipment (gov't or civil), with a
> >>>> locking connector.
> >>>>
> >>>> That stuff is designed for minimum size and weight. You might find the
> >>>> inside of the box quite cramped.
> >>>>
> >>>> Buying aviation parts is even more expensive than buying boat parts.
> >>>>
> >>>> Bill Hawkins
> >>>>
> >>>>
> >>>> -Original Message-
> >>>> From: time-nuts on behalf Of Bob Bownes
> >>>> Sent: Friday, May 19, 2017 10:48 PM
> >>>>
> >>>> Pretty sure that connector is an off the shelf Amphenol part. If you
> >>>> can't find it, however, you can replace it with an off the shelf one
> >>>> that will fit in the same hole. (If your lucky, you can even re-use
> the
> >>>> pins.)
> >>>>
> >>>> The replacement will run you about $30-40 for the pair, chassis and
> >>>> plug. Check Mouser, etc.
> >>>>
> >>>>> On May 19, 2017, at 23:21, Bob kb8tq <kb...@n1k.org> wrote:
> >>>>>
> >>>>> The mating side of that 22 pin connector isn't going to be cheap. It
> >>>>> looks like something out of their government systems group back in
> the
> >>>> late 90's. If it is, you may have a hard time getting info on it.
> >>>>> I'd pop it open and see what's inside. At least that will give you an
> >>>>> idea if it's 20 years old or 5 years old. Knowing the era should help
> >>>> in the search for information.
> >>>>>
> >>>>> Bob
> >>>>>
> >>>>>> On May 19, 2017, at 10:21 PM, Scott Armstrong <aa...@vntx.net>
> wrote:
> >>>>>>
> >>>>>> I acquired a Trimble 16634-10 receiver. A search of the web has
> >>>>>> turned up nothing so far.
> >>>>>> The unit is in a steel box built like a tank. SMA connector for
> >>>>>&

Re: [time-nuts] Looking for info on Trimble 16634-10

[Scott Armstrong]

Hi Guys,

I popped open the case.  Not too crowded in side. The case is an extruded
aluminum case that has the back endplate  welded on.

There are 4 board assemblies in the case.

*Interface board that connects the 22 pin connector to the other two boards.
* Power supply board. (12016-00). Main component looks to be a DC-DC
converter made by Computer Products.
* Main board (14636-)  This board has a 16.368 MHz osc made by NDK.
* A daughter board (14789E) which is the receiver and is attached to the
main board.

Date codes I see are 89, 91, 92 and 93  so unit was probably assembled in
'93.

Maybe some of the assembly numbers will be recognizable if they are used in
other units.

Thanks,
Scott AA5AM


On Sat, May 20, 2017 at 12:33 AM, Bill Hawkins <bill.i...@pobox.com> wrote:

> FWIW, that looks like aviation equipment (gov't or civil), with a
> locking connector.
>
> That stuff is designed for minimum size and weight. You might find the
> inside of the box quite cramped.
>
> Buying aviation parts is even more expensive than buying boat parts.
>
> Bill Hawkins
>
>
> -Original Message-
> From: time-nuts on behalf Of Bob Bownes
> Sent: Friday, May 19, 2017 10:48 PM
>
> Pretty sure that connector is an off the shelf Amphenol part. If you
> can't find it, however, you can replace it with an off the shelf one
> that will fit in the same hole. (If your lucky, you can even re-use the
> pins.)
>
> The replacement will run you about $30-40 for the pair, chassis and
> plug. Check Mouser, etc.
>
> > On May 19, 2017, at 23:21, Bob kb8tq <kb...@n1k.org> wrote:
> >
> > The mating side of that 22 pin connector isn't going to be cheap. It
> > looks like something out of their government systems group back in the
> late 90's. If it is, you may have a hard time getting info on it.
> > I'd pop it open and see what's inside. At least that will give you an
> > idea if it's 20 years old or 5 years old. Knowing the era should help
> in the search for information.
> >
> > Bob
> >
> >> On May 19, 2017, at 10:21 PM, Scott Armstrong <aa...@vntx.net> wrote:
> >>
> >> I acquired a Trimble 16634-10 receiver. A search of the web has
> >> turned up nothing so far.
> >> The unit is in a steel box built like a tank. SMA connector for
> >> antenna input and a 22 pin circular connector for the I/O and power
> >>
>
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[time-nuts] Looking for info on Trimble 16634-10

[Scott Armstrong]

Hello all,

I acquired a Trimble 16634-10 receiver. A search of the web has turned up
nothing so far.
The unit is in a steel box built like a tank. SMA connector for antenna
input and a 22 pin circular connector for the I/O and power

Does anyone have any pin out information, specs, etc.?

A picture of the unit can bee seen on ebay at

http://www.ebay.com/itm/TRIMBLE-NAVIGATION-GPS-UNIT-16634-10-/361934484802?nma=true=8bBNGShIPf%252FvJpucfMDlEGXDrwI%253D_cvip=true=nc&_trksid=p2047675.l2557


Thanks in advance,

Scott AA5AM
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