[time-nuts] tbolt2lcd Thunderbolt Monitor

[Dr . Götz Romahn]

A software update of my a small monitor for Trimble Thunderbolt, named 
tbolt2lcd, is available from:

http://www.romahn.info/tbolt2lcd/
It does handle week rollover sins 30-Jul-2017 correctly (I hope).
Götz
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Re: [time-nuts] 53132 replacement fan

[Dr . Götz Romahn]

try this site:
http://www.eevblog.com/forum/testgear/replace-fan-on-53131a-counter-with-quieter-version/msg727690/#msg727690
Götz


Am 21.11.2016 um 02:43 schrieb Christopher Hoover:

I was able to cross it easily to a well-known fan manufacturer's part.
If someone doesn't chime in, I'll dig through my notes and get you the
details.

-christopher.
73 de AI6KG

On Sun, Nov 20, 2016 at 11:14 AM, John Ackermann N8UR  wrote:


Does anyone have a part number for the 53132 fan (or equivalent)?  Mine is
getting pretty noisy.

Thanks!
John
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--
Götz Romahn
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Re: [time-nuts] PRS 10 proble

[Dr . Götz Romahn]

Bert,
moving the controller board does not work, but moving the lamp assy did 
work here.


Am 02.03.2016 um 13:41 schrieb Bert Kehren via time-nuts:

We have two PRS 10 units, one with the 1 pps disciplining circuit. Its lamp
  module failed. Moving the controller board to the one without the 1 pps
circuit  did not work. Does any one have done the move successfully.
Bert Kehren
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cheers
Götz Romahn
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Re: [time-nuts] jupiter-t tu60-d120 (maybe d125), pinguino and GPSDO

[Dr. Götz Romahn]

helloMichael,
since I own 2 Jupiter TU60 I am interested in your PCP/Schematics and 
ofcourse the software packet. Please tell me the appropriate conditions.

tnx Götz DL7AOT


Am 20.05.2014 20:16, :

Hi Bret

I did a design some years ago with the TU30/TU60/TU120 used as GPSDO for the
OZ7IGY beacon project, I have a software packet and instructions to turn the
Motorola output to NMEA I can email you.

If you chose to go on with the TUxx GPSDO I can supply you with a PCB.

OZ7IGY Project info: http://rudius.net/oz2m/ngnb/index.htm

Regards
Michael, OZ2ELA


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Re: [time-nuts] TSIP protocol for T-Bolt

[Dr. Götz Romahn]

hi Alex,
thanks for writing in German (vielen Dank). Tom made all the manuals 
available now, so you can fetch them here:

http://www.leapsecond.com/pages/tbolt/manual.htm
herzliche Grüße Götz
PS:Ich bin ebenfalls Elektroingenieur im Ruhestand. (i am also an 
electronics engineer, retired now)



Am 26.03.2014 18:43, :

Hallo Götz,
ich bin kein time nut, aber ich bin ein Frequency nut, und einer, nach
Amerika verschollene deutsche Elektroingenieur in Ruhestand und
Funkamateur KJ6UHN,
und icgh habe den  Thunderbolt, die Hardware, und deswegen moechte Sie
hoeflichst fragen diese

i've found 3 pdf Thunderbolt-Manuals identified as:
-V3 from 2000
-V3 from 2003 and
-V1 from 2012

zu zuschicken
mit besten Dank im Voraus
73
KJ6UHN
Alex


On 3/26/2014 9:13 AM, Götz Romahn wrote:

hi all,
as is my commentent to /tvb's question.
Hope it helps, Götz

Tom,
i've found 3 pdf Thunderbolt-Manuals identified as:
-V3 from 2000
-V3 from 2003 and
-V1 from 2012
Differences are in the Report Packet 0x8F-AC Data Format pp A62,A62
and 81.
If you compare, there are differences among
Byte 1 (Receiver Mode) Bits 5 and6,
Byte 13 (Disciplining Activity) Bits 8 and 9
Bytes 8,9 (Critical Alarms) Bits 1,2,3
Bytes 10,11 (Minor Alarms) Bits 9 and 11 (and yes, Bit 11 is set from
my Tbolt (Firmware V3.00) if I remember correctly). Use of Bit 10
(EEPROM invalid) is not decribed. I have not it tested though :-)
A rather reliable reference are Messages from Thunderbolt Monitor V2.60.
regards Götz


Am 26.03.2014 15:05, :

but beware, no single document related to Thunderbolt from Trimbles
website is complete nor fully correct.


Can you give me an example of some TBolt command that is not in the
TBolt document?


As a reference you may use my code of a simple Tbolt-Monitor you
will here:
http://www.romahn.info/tbolt2lcd/
regards Götz


Nice. Thanks for posting that.

Thanks,
/tvb




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Re: [time-nuts] Repair of PRS10 Lamp Assembly

[Dr. Götz Romahn]

Thanks for all your comments so far. I did sniffing with a cable loop 
located in the lamp cell (thank you Bob for this advice), and surprise 
(!) RF power does not degrade with time but does stay rock solid after 
ignition. So, sorry Bob, you did not win the bet this time. Next step 
should be to check, what is going on with heating. Not so easy since all 
the many diagnostics are within range. As a provisory measure I decided 
to cheat the lamp heat regulator somehow by paralleling a 39 KOhm 
resistor to R226 an thereby shifting the operating point of the 
thermistors in lamp assembly. PPR10, when started properly, now seems to 
work as expected.
One comment to the lamp starting algorithm: oscillator FET drain and 
gate voltage are controlled via factory set values but not on an 
individual basis. All lamps are started with FET voltage set to maximum 
available via SD2=255  and after inginition to some reduced value also 
via SD2=55. So there is no need to change set values for different lamp 
assemblies.

Goetz


Am 18.03.2013 01:34, :

Hi

I'd bet that something is keeping the oscillator from putting out enough RF. 
The circuit is simple enough that the issue is one of a very small number of 
parts. I'd bet on the FET…..

Bob

On Mar 17, 2013, at 8:24 PM, brucekar...@aol.com wrote:


I am afraid the PRS-10 lamp starting algorithm is a little involved.   I
believe that once the lamp temperature is in the starting range, the
microprocessor ramps up the drain and possibly gate voltage of the heating
oscillator FET until the bulb strikes as evidenced by a DC signal at the  
detector.
If the lamp overheats (as measured by thermistors imbedded in  the back of
the lamp block), at some point the microprocessor will reduce the  drain
voltage to a safe steady-state value.

The starting constants for each individual PRS-10 are factory-set in  the
unit's programmed software, and as far as I know, access to change these
settings has not been made available yet to end users.  This makes it
difficult to swap lamps between units.

I have a PRS-10 with a lamp that is just on the edge of starting  properly.
Since I cannot change the factory-programmed values, I have  tried adding
a shunt resistor to increase the lamp current to the point where it  would
reliably start.  But, unfortunately, other problems seem to be  keeping the
unit from working properly.

The only luck I have had in repairing a non-working PRS-10 with certainty,
was one in a Symmetricom 2500 Time Source that turned out to have a  failed
Mini-Circuits VCO on the synthesizer board.  Replacing the VCO  module
restored proper operation.

Perhaps someday the factory will provide end users with access to what  are
now factory-only settings.

Bruce, KG6OJI
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Re: [time-nuts] Repair of PRS10 Lamp Assembly

[Dr. Götz Romahn]

thank you for fast responses. As I wrote in my posting, heating seems to 
be ok as reported by the PRS10 diagnostic tools. I agree with Bob and 
Paul: RF seems to degrade with warming up, but how can I test this. 
Remember, lamp and oscillator of PRS10 are not!!! accessible during 
operation and what part of hte oscillator could be the culprit ( and why 
do you think it is) ?

Goetz

Am 17.03.2013 20:59, :

My 2 cents and it is that. The FRS use a higher voltage say 24 V and on
ignition that drops back. I have also seen on time-nuts older systems that
actually use an ignition voltage to trigger the lamp.
But I agree that it sounds like the RF might be low. The bulb does need to
be heated to get to the right color temperature also.

On Sun, Mar 17, 2013 at 9:03 AM, Bob Camp li...@rtty.us wrote:


Hi

Unless the PRS10 is very unusual in it's operation there are two things to
check early in the debug process:

1) Is the oven heating up to roughly the right temperature?

2) The lamp is lit by RF energy. If the oscillator / amplifier supplying
the RF isn't putting out as much as it should (or what it should) the lamp
will not stay lit.

I'd bet on number 2 in your case. There are many other possibilities, but
I'd check those two first.

Bob

On Mar 17, 2013, at 5:22 AM, Dr. Götz Romahn go...@g-romahn.de wrote:


dear all,
beeing a silent reader of this list for a while, I now ask my first

question.

I have obtained a PRS10 that was declared faulty and it is. The problem

I located in lamp assy.

Lamp ignites only after warming up and pushing by a voltage kick from

abt. 24V to abt 28V on the -24_heat line for some seconds. PRS10 gets
locked there after and rbmon shows a seemingly healthy unit (see
attachment). But... within some 15 to 45 minutes later light from lamp
degrades as seen through LAMP VIEW hole in top board as well as AD9
Photocell I/V going down from 1.68 after ignition to 0.158 and lock is lost
of course. Since all heating and voltage diagnostics do stay within
accepted limits I suspect some problem within lamp enclosure (see
attachment). Your help for further diagnosis and any hints for obtaining
spare parts would be appreciated very much.

Cheers Goetz
PRS10 after

ignition.jpglamp-assy.jpg___

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