Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

[Brad Dye]

Tom, et.al.

The E911 installation, in the news, is just one of several. Others are 
hospitals, fire stations, etc. using different dispatch systems.

In a wide-area simulcast-overlap paging system, the transmitters in the same 
coverage area are carefully set to all transmit at exactly the same time. Each 
transmitter frequency is set to be slightly different in order to control 
signal overlap/signal cancellation (read: a few Hertz). This has allowed 
simulcast paging to achieve better coverage that any other technology that I am 
aware of — especially in a one-to-many transmission.  Some of the fine points 
of this system engineering are discussed here: 
http://braddye.com/angus_flex_at_6400.html 


A simple explanation of simulcasting is here: 
http://braddye.com/simulcasting.html 

So to me "synchronizing transmitters” means the control system sends the 
traffic out to all the transmitters (over satellite) and tells them all to hold 
the messages in a buffer until “the big hand points straight up” or whatever 
data command the system uses. (excuse the vernacular) 

The problems being experienced right now appear to be the interface of the 
ThunderBolt with the Zetron Model 620 simulcast controller over TSIP. The 
Zetron box is also called a “wireless data encoder.” 
https://www.zetron.com/Portals/0/PDFs/products/Spec%20Sheet%20PDFs/04-Paging/005-1232%20Model%20600-620%20Spec.pdf
 

 This is beyond my pay grade since I am 75 years old and semi-retired.

It is not our goal to blame a particular piece of equipment for this problem. 
The facts are the 1024 roll over happened and just about nobody in the paging 
business knew it was coming. A solution does not need to be found before 
replacement hardware arrives from wherever it is manufactured—in two weeks. I 
am sure the operators would rather solve it with a translator box, or 
something, than buy a new GPSDO for every transmitter in a system — because 
there are many.

When I worked in the paging industry and there was a public safety emergency 
because a system was off the air, no one ate or slept until it was fixed. Well 
that may be a slight exaggeration because I have never missed many meals.

Best Regards,

Brad Dye, K9IQY (licensed 60 years)
Editor, The Wireless Messaging News
P.O. Box 266
Fairfield, IL  62837 USA
Telephone: 618-599-7869
Skype: braddye
http://www.braddye.com 
> On Aug 10, 2017, at 7:59 PM, Tom Van Baak  > wrote:
> 
> Brad,
> 
> Strictly speaking, there's no problem with GPS, or Trimble, or the 
> Thunderbolt GPSDO: each did exactly as designed and documented. Anyone 
> working with timing systems (from astronomy to calendars to watch making to 
> operating systems) knows there are many subtle details. Just wait until 2038 
> for MOAR (the unix Mother of all Rollovers)!
> 
> Each GPS receiver manufacturer deals with dates and times and rollovers 
> differently. Still, it sounds like the 3rd party who wrote software for the 
> E911 or paging system forgot to read the manual on the GPS receiver they 
> chose.
> 
>> The Trimble Thunderbolts are used in many Radio Paging Systems to
>> synchronize their transmitters in simulcast mode.
>> Systems that are using the models affected by the 1024 week epoch
>> are currently off the air or functioning poorly.
> 
> If you are able, can you explain to us what exactly in the transmitters is 
> the problem? All of our TBolts continue to give valid 1 PPS and 10 MHz 
> outputs. What exactly do you mean by "synchronizing transmitters"?
> 
>> Trimble's only distributor, Novotech, did not know about it and had no
>> inventory of the new replacement E series Thunderbolt GPS Receivers.
>> Trimble says they are shipping new units from their overseas factory in
>> about 2 weeks -- that's the best they can offer!
> 
> Is there no way for E911 people to manually set the clock on their system?
> 
>> I read here on the Time Nuts messages that some are considering: "some 
>> in-line
>> device that re-writes the serial data as it comes out of the Thunderbolt
> 
> Right, that was an idea I mentioned. Easy to do but I don't think anyone 
> bothered, because:
> 
> 1) Mark had already fixed Heather.exe for his users, some NTP people added 
> code to their TBolt drivers, Didier updated his LCD Monitor board -- these 
> are all solutions that keep the same TBolt and just tweak the interpretation 
> of the received TSIP date. Hence no need to update the TBolt or create an 
> inline date-fixer gizmo.
> 
> 2) Almost all of us use TBolts for their precise time & frequency outputs, 
> not their TSIP packets, so rollovers don't matter.
> 
>> Does anyone plan to do this? Or does anyone have any ideas for a short-term 
>> solution.
>> Any suggestions 

Re: [time-nuts] TBolt and the Local News

[Adrian Godwin]

I wonder if we're about to see another wave of surplus Thunderbolts ?


On Fri, Aug 11, 2017 at 12:59 AM, paul swed  wrote:

> Sweet. Yankee ingenuity at its best. $27K thats seriously nice.
> Almost enough to get me to code something. But then its 911 services maybe
> not.
> Regards
> Paul
> WB8TSL
>
> On Thu, Aug 10, 2017 at 7:00 PM, Bob kb8tq  wrote:
>
> > Hi
> >
> > They said that hardware was swapped out.
> >
> > Bob
> >
> > > On Aug 10, 2017, at 6:48 PM, Chris Caudle 
> wrote:
> > >
> > > On Thu, August 10, 2017 5:12 pm, Bob kb8tq wrote:
> > >> Next up is the comment that it took two weeks
> > >> and $27,000 to fix.
> > >
> > > I wonder if that was the cost to purchase new GPSDO units, or the cost
> to
> > > have Trimble dust off the old source code and make a special release
> for
> > > them?
> > >
> > > --
> > > Chris Caudle
> > >
> > >
> > >
> > >
> > > ___
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Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

[Tom Van Baak]

Brad,

Strictly speaking, there's no problem with GPS, or Trimble, or the Thunderbolt 
GPSDO: each did exactly as designed and documented. Anyone working with timing 
systems (from astronomy to calendars to watch making to operating systems) 
knows there are many subtle details. Just wait until 2038 for MOAR (the unix 
Mother of all Rollovers)!

Each GPS receiver manufacturer deals with dates and times and rollovers 
differently. Still, it sounds like the 3rd party who wrote software for the 
E911 or paging system forgot to read the manual on the GPS receiver they chose.

> The Trimble Thunderbolts are used in many Radio Paging Systems to
> synchronize their transmitters in simulcast mode.
> Systems that are using the models affected by the 1024 week epoch
> are currently off the air or functioning poorly.

If you are able, can you explain to us what exactly in the transmitters is the 
problem? All of our TBolts continue to give valid 1 PPS and 10 MHz outputs. 
What exactly do you mean by "synchronizing transmitters"?

> Trimble's only distributor, Novotech, did not know about it and had no
> inventory of the new replacement E series Thunderbolt GPS Receivers.
> Trimble says they are shipping new units from their overseas factory in
> about 2 weeks -- that's the best they can offer!

Is there no way for E911 people to manually set the clock on their system?

> I read here on the Time Nuts messages that some are considering: "some in-line
> device that re-writes the serial data as it comes out of the Thunderbolt

Right, that was an idea I mentioned. Easy to do but I don't think anyone 
bothered, because:

1) Mark had already fixed Heather.exe for his users, some NTP people added code 
to their TBolt drivers, Didier updated his LCD Monitor board -- these are all 
solutions that keep the same TBolt and just tweak the interpretation of the 
received TSIP date. Hence no need to update the TBolt or create an inline 
date-fixer gizmo.

2) Almost all of us use TBolts for their precise time & frequency outputs, not 
their TSIP packets, so rollovers don't matter.

> Does anyone plan to do this? Or does anyone have any ideas for a short-term 
> solution.
> Any suggestions would be sincerely appreciated.

Presumably the E911 system runs some kind of software or operating system? 
Surely there's a way to have the guys who wrote the s/w put a fix in? That 
should be much faster and cheaper than waiting 2 weeks for new h/w, no?

Bob,

> Next up is the comment that it took two weeks and $27,000 to fix.

Wow! At that price, I bet quite a few time-nuts will have a R-Pi or Arduino or 
PIC solution ready by the weekend. Me, I'm busy with family and eclipse and so 
will have to pass on the offer.

You'll want to continuously read serial, unpack TSIP (the DLE stuff), fix the 
0x8F-AB message, repack into TSIP and serial output. You may even get away with 
a single UART since the Rx/Tx pins are both 9600 baud and full duplex. The 
0x8F-AB date fix involves converting UTC ymd to #days, adding 1024, converting 
#days to UTC ymd, where #days is any linear day counting system that works from 
1980 to 2100. Both Mark and I posted samples a while ago. It may take some work 
to make the inline translator code asynchronous enough to avoid data loss or 
excessive packet latency, though. And it's impossible to do real-time 
byte-for-byte translation because the DLE escapes in TSIP can slightly alter 
the byte count.

Adrian,

> While it wouldn't be difficult to build such a device, manufacturing a decent
> quantity in less than 2 weeks to beat Trimble would be a tall order.

Agreed. You know as there's a customer, a weekend project can easily turn into 
a 2 week project.

/tvb

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Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

[Bob kb8tq]

Hi

Indeed, this could be a new wave of TBolts into the market. My fear is that 
those
handling it are not going to sell off the “rejects”. They’ll just toss them in 
the trash.

Bob

> On Aug 10, 2017, at 8:00 PM, paul swed  wrote:
> 
> Just remember you are taking on E911 responsibility.
> Not that brave.
> But come on all those tbolts going in the trash. Sounds like goodies.
> Regards
> Regards
> Paul
> WB8TSL
> 
> 
> On Thu, Aug 10, 2017 at 7:55 PM, Adrian Godwin  wrote:
> 
>> While it wouldn't be difficult to build such a device, manufacturing a
>> decent quantity in less than 2 weeks to beat Trimble would be a tall order.
>> 
>> There are, however, programmable converters : all the hardware you need and
>> just needs some suitable software. For example :
>> 
>> http://www.kksystems.com/programmable-protocol-converters/ppc-4-h2-c.html
>> 
>> It does rather more than you need, there may be cheaper alternatives.
>> 
>> 
>> 
>> On Thu, Aug 10, 2017 at 6:24 PM, Brad Dye  wrote:
>> 
>>> The Trimble Thunderbolts are used in many Radio Paging Systems to
>>> synchronize their transmitters in simulcast mode. Systems that are using
>>> the models affected by the 1024 week epoch are currently off the air or
>>> functioning poorly. This is a very serious issue because many doctors and
>>> nurses as well as first responders rely on their pagers for emergency
>>> notification.
>>> 
>>> Trimble’s only distributor, Novotech, did not know about it and had no
>>> inventory of the new replacement E series Thunderbolt GPS Receivers.
>>> Trimble says they are shipping new units from their overseas factory in
>>> about 2 weeks — thats the best they can offer!
>>> 
>>> I read here on the Time Nuts messages that some are considering: "some
>>> in-line device that re-writes the serial data as it comes out of the
>>> Thunderbolt”
>>> 
>>> Does anyone plan to do this? Or does anyone have any ideas for a
>>> short-term solution.
>>> 
>>> Any suggestions would be sincerely appreciated.
>>> 
>>> Best Regards,
>>> 
>>> Brad Dye
>>> Editor, The Wireless Messaging News
>>> P.O. Box 266
>>> Fairfield, IL  62837 USA
>>> Telephone: 618-599-7869
>>> Skype: braddye
>>> http://www.braddye.com
>>> 
>>> 
>>> ___
>>> time-nuts mailing list -- time-nuts@febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/
>>> mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>> 
>> ___
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Re: [time-nuts] TBolt and the Local News

[Bob kb8tq]

Hi

Since it *is* in a 911 context, whatever is done has a bit of liability 
associated
with it. I also have zero information on how many devices were involved. It 
could easily have been 54 towers at $200 each for hardware and $300 each  
for overhead and labor. 

Bob

> On Aug 10, 2017, at 7:59 PM, paul swed  wrote:
> 
> Sweet. Yankee ingenuity at its best. $27K thats seriously nice.
> Almost enough to get me to code something. But then its 911 services maybe
> not.
> Regards
> Paul
> WB8TSL
> 
> On Thu, Aug 10, 2017 at 7:00 PM, Bob kb8tq  wrote:
> 
>> Hi
>> 
>> They said that hardware was swapped out.
>> 
>> Bob
>> 
>>> On Aug 10, 2017, at 6:48 PM, Chris Caudle  wrote:
>>> 
>>> On Thu, August 10, 2017 5:12 pm, Bob kb8tq wrote:
 Next up is the comment that it took two weeks
 and $27,000 to fix.
>>> 
>>> I wonder if that was the cost to purchase new GPSDO units, or the cost to
>>> have Trimble dust off the old source code and make a special release for
>>> them?
>>> 
>>> --
>>> Chris Caudle
>>> 
>>> 
>>> 
>>> 
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>> mailman/listinfo/time-nuts
>>> and follow the instructions there.
>> 
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Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

[paul swed]

Just remember you are taking on E911 responsibility.
Not that brave.
But come on all those tbolts going in the trash. Sounds like goodies.
Regards
Regards
Paul
WB8TSL


On Thu, Aug 10, 2017 at 7:55 PM, Adrian Godwin  wrote:

> While it wouldn't be difficult to build such a device, manufacturing a
> decent quantity in less than 2 weeks to beat Trimble would be a tall order.
>
> There are, however, programmable converters : all the hardware you need and
> just needs some suitable software. For example :
>
> http://www.kksystems.com/programmable-protocol-converters/ppc-4-h2-c.html
>
> It does rather more than you need, there may be cheaper alternatives.
>
>
>
> On Thu, Aug 10, 2017 at 6:24 PM, Brad Dye  wrote:
>
> > The Trimble Thunderbolts are used in many Radio Paging Systems to
> > synchronize their transmitters in simulcast mode. Systems that are using
> > the models affected by the 1024 week epoch are currently off the air or
> > functioning poorly. This is a very serious issue because many doctors and
> > nurses as well as first responders rely on their pagers for emergency
> > notification.
> >
> > Trimble’s only distributor, Novotech, did not know about it and had no
> > inventory of the new replacement E series Thunderbolt GPS Receivers.
> > Trimble says they are shipping new units from their overseas factory in
> > about 2 weeks — thats the best they can offer!
> >
> > I read here on the Time Nuts messages that some are considering: "some
> > in-line device that re-writes the serial data as it comes out of the
> > Thunderbolt”
> >
> > Does anyone plan to do this? Or does anyone have any ideas for a
> > short-term solution.
> >
> > Any suggestions would be sincerely appreciated.
> >
> > Best Regards,
> >
> > Brad Dye
> > Editor, The Wireless Messaging News
> > P.O. Box 266
> > Fairfield, IL  62837 USA
> > Telephone: 618-599-7869
> > Skype: braddye
> > http://www.braddye.com
> >
> >
> > ___
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/
> > mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
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Re: [time-nuts] Using Timelab

[Jerry Stern]

Opps my smartphone spell corrected somehow.  My question is about Timelab  not 
timewave

Sorry
Jerry

Sent from my iPhone

> On Aug 10, 2017, at 6:52 PM, Jerry Stern  wrote:
> 
> I have a PM6690 and it seems to work with Prologix GPIB/USB and latest 
> version of Timewave.  I have never used the software before.  I have my 
> Thunderbolt connected as external ref and as Input A measuring Freq.  inset 
> up Timewave for a modified Allan Dev taking datapoints every second for 2 
> hours.  After about 10-15 mins it had collected 7200 points and stop and said 
> insufficient data points were acquired.  Why did Timewave stop exactly at 
> 7200 ?
> 
> Any advice appreciated to get me on the right track
> 
> Jerry  
> 
> Sent from my iPhone

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Re: [time-nuts] TBolt and the Local News

[paul swed]

Sweet. Yankee ingenuity at its best. $27K thats seriously nice.
Almost enough to get me to code something. But then its 911 services maybe
not.
Regards
Paul
WB8TSL

On Thu, Aug 10, 2017 at 7:00 PM, Bob kb8tq  wrote:

> Hi
>
> They said that hardware was swapped out.
>
> Bob
>
> > On Aug 10, 2017, at 6:48 PM, Chris Caudle  wrote:
> >
> > On Thu, August 10, 2017 5:12 pm, Bob kb8tq wrote:
> >> Next up is the comment that it took two weeks
> >> and $27,000 to fix.
> >
> > I wonder if that was the cost to purchase new GPSDO units, or the cost to
> > have Trimble dust off the old source code and make a special release for
> > them?
> >
> > --
> > Chris Caudle
> >
> >
> >
> >
> > ___
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> > and follow the instructions there.
>
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Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

[Adrian Godwin]

While it wouldn't be difficult to build such a device, manufacturing a
decent quantity in less than 2 weeks to beat Trimble would be a tall order.

There are, however, programmable converters : all the hardware you need and
just needs some suitable software. For example :

http://www.kksystems.com/programmable-protocol-converters/ppc-4-h2-c.html

It does rather more than you need, there may be cheaper alternatives.



On Thu, Aug 10, 2017 at 6:24 PM, Brad Dye  wrote:

> The Trimble Thunderbolts are used in many Radio Paging Systems to
> synchronize their transmitters in simulcast mode. Systems that are using
> the models affected by the 1024 week epoch are currently off the air or
> functioning poorly. This is a very serious issue because many doctors and
> nurses as well as first responders rely on their pagers for emergency
> notification.
>
> Trimble’s only distributor, Novotech, did not know about it and had no
> inventory of the new replacement E series Thunderbolt GPS Receivers.
> Trimble says they are shipping new units from their overseas factory in
> about 2 weeks — thats the best they can offer!
>
> I read here on the Time Nuts messages that some are considering: "some
> in-line device that re-writes the serial data as it comes out of the
> Thunderbolt”
>
> Does anyone plan to do this? Or does anyone have any ideas for a
> short-term solution.
>
> Any suggestions would be sincerely appreciated.
>
> Best Regards,
>
> Brad Dye
> Editor, The Wireless Messaging News
> P.O. Box 266
> Fairfield, IL  62837 USA
> Telephone: 618-599-7869
> Skype: braddye
> http://www.braddye.com
>
>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> and follow the instructions there.
>
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Re: [time-nuts] TBolt and the Local News

[Bob kb8tq]

Hi

They said that hardware was swapped out. 

Bob

> On Aug 10, 2017, at 6:48 PM, Chris Caudle  wrote:
> 
> On Thu, August 10, 2017 5:12 pm, Bob kb8tq wrote:
>> Next up is the comment that it took two weeks
>> and $27,000 to fix.
> 
> I wonder if that was the cost to purchase new GPSDO units, or the cost to
> have Trimble dust off the old source code and make a special release for
> them?
> 
> -- 
> Chris Caudle
> 
> 
> 
> 
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Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

[Brad Dye]

The Trimble Thunderbolts are used in many Radio Paging Systems to synchronize 
their transmitters in simulcast mode. Systems that are using the models 
affected by the 1024 week epoch are currently off the air or functioning 
poorly. This is a very serious issue because many doctors and nurses as well as 
first responders rely on their pagers for emergency notification.

Trimble’s only distributor, Novotech, did not know about it and had no 
inventory of the new replacement E series Thunderbolt GPS Receivers. Trimble 
says they are shipping new units from their overseas factory in about 2 weeks — 
thats the best they can offer!  

I read here on the Time Nuts messages that some are considering: "some in-line 
device that re-writes the serial data as it comes out of the Thunderbolt”

Does anyone plan to do this? Or does anyone have any ideas for a short-term 
solution.

Any suggestions would be sincerely appreciated.

Best Regards,

Brad Dye
Editor, The Wireless Messaging News
P.O. Box 266
Fairfield, IL  62837 USA
Telephone: 618-599-7869
Skype: braddye
http://www.braddye.com


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[time-nuts] Using Timewave

[Jerry Stern]

I have a PM6690 and it seems to work with Prologix GPIB/USB and latest version 
of Timewave.  I have never used the software before.  I have my Thunderbolt 
connected as external ref and as Input A measuring Freq.  inset up Timewave for 
a modified Allan Dev taking datapoints every second for 2 hours.  After about 
10-15 mins it had collected 7200 points and stop and said insufficient data 
points were acquired.  Why did Timewave stop exactly at 7200 ?

Any advice appreciated to get me on the right track

Jerry  

Sent from my iPhone
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Re: [time-nuts] time-nuts Digest, Vol 157, Issue 14

[Andre]

Hi, I might actually have one of these lowtempalloy_ripped off an old phone 
base station PCB.

I recall sending one of them to dave_b on 4HV.org, maybe he still has it?
The modules are double oven so probably useful, not sure about the frequency 
though.

Also re. DIY atomic clock, never did manage to find a non working Rb module for 
tinkering.
Does anyone have one with low emission which they want to sell please?

thanks, -Andre

From: time-nuts  on behalf of 
time-nuts-requ...@febo.com 
Sent: 09 August 2017 17:00
To: time-nuts@febo.com
Subject: time-nuts Digest, Vol 157, Issue 14

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Today's Topics:

   1. Re: Vectron Labs 100MHz OCXO datasheet? (Dave M)
   2. Re: Vectron Labs 100MHz OCXO datasheet? (jimlux)


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Message: 1
Date: Wed, 9 Aug 2017 09:57:55 -0500
From: "Dave M" 
To: "Discussion of precise time and frequency measurement"

Subject: Re: [time-nuts] Vectron Labs 100MHz OCXO datasheet?
Message-ID: 
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=original

Neil Smith G4DBN wrote:
> Does anyone have any technical info on a Vectron Laboratories 100MHz
> OCXO, model 724Y3067 (part number A61583-1) please? Can’t find a
> datasheet on the current Vectron Inc website and my Google-fu is weak
> today. Neil



The 724Y is a model in Vectron's CO-724 series.  I've sent a copy of the
datasheet directly to Neil

Cheers,
Dave M



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Message: 2
Date: Wed, 9 Aug 2017 08:07:28 -0700
From: jimlux 
To: Discussion of precise time and frequency measurement

Subject: Re: [time-nuts] Vectron Labs 100MHz OCXO datasheet?
Message-ID: 
Content-Type: text/plain; charset=utf-8; format=flowed

On 8/8/17 11:04 PM, Neil Smith G4DBN wrote:
> Does anyone have any technical info on a Vectron Laboratories 100MHz OCXO, 
> model 724Y3067 (part number A61583-1) please? Can’t find a datasheet on the 
> current Vectron Inc website and my Google-fu is weak today.
> Neil
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>
that doesn't resemble a standard vectron part number

You might look at the CO-724

https://www.vectron.com/products/ocxo/co724725.htm

I don't know if Y indicates the temperature range... probably a custom.

FOr others in that series, the next two digits indicate the frequency
stability - 58 -> 5E-8, 28 -> 2E-8, 17->1E-7

30 -> 3E-10?

If you're looking at the one in the various online ads, the pinout is
pretty different - this is almost certainly a custom.

You could always send an email to Vectron




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Re: [time-nuts] TBolt and the Local News

[Chris Caudle]

On Thu, August 10, 2017 5:12 pm, Bob kb8tq wrote:
> Next up is the comment that it took two weeks
> and $27,000 to fix.

I wonder if that was the cost to purchase new GPSDO units, or the cost to
have Trimble dust off the old source code and make a special release for
them?

-- 
Chris Caudle




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[time-nuts] TBolt and the Local News

[Bob kb8tq]

Hi

So I’m sitting at dinner focusing on a cold beverage, with the local 
news running in the background. Blah blah blah … local EMS system
down for two weeks…. surprise hardware failure takes out “paging 
system” … blah .. blah … blah …

So finally they pop up with the “documentation” related to the failure.
… ThunderBolt will fail … hmmm… I think I’ve heard about TBolt’s 
failing recently. Maybe the local county 911 should subscribe to TimeNuts !!!

Next up is the comment that it took two weeks and $27,000 to fix. !!! If that 
all went to Trimble, I can see why they would prefer to let them fail vs issuing
some sort of firmware update :)

Back to my cold beverage ….

Bob
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Re: [time-nuts] interesting HP divider and clock on ebay

[timeok]

   Hi,
   I have an HP115 H27 for sale.
   It has a small mechanical problem on the fast Time Reference knob.
   Request 499 Euros + shipping cost.
   Location Italy.
   Luciano
   If interested email me directly:   tim...@timeok.it


   Da "time-nuts" time-nuts-boun...@febo.com
   A "Discussion of precise time and frequency measurement" time-nuts@febo.com
   Cc
   Data Thu, 10 Aug 2017 03:27:12 +
   Oggetto Re: [time-nuts] interesting HP divider and clock on ebay
   The inside looks very much like the inside of the 113. Different layout but
   similar components and, it appears, also a 1 KHz motor.

   J.


   On Wed, Aug 9, 2017 at 8:22 PM paul swed  wrote:

   > Thanks Tom I am familiar with the unit and this looks really nice. But
   > won't be in my rack.
   > Regards
   > Paul
   > WB8TSL
   >
   > On Wed, Aug 9, 2017 at 8:32 PM, Tom Van Baak  wrote:
   >
   > > > Boy I have to say the front looks great. Good pixs to look at.
   > > > Price not exciting at all. But maybe someone has a spare kilo-buck.
   > >
   > > Paul,
   > >
   > > More info on the hp 115:
   > >
   > > http://hpmemoryproject.org/wb_pages/wall_b_page_01.htm
   > >
   > > /tvb
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   > >
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