date:20120122

The current batch of (about) $40 units are different from what was
available a year ago.  These new ones require 5V DC input in addition
to 15V and can only be programmed via RS232 a few Hz away from 10MHz.
So they are only good for use as a 10MHz reference

Option 2 in the book refers to a different type FE5380 that can be
programed over a very wide range of several MHz.   I think these are
still being sold on eBay but not for $40.  They seem to be over $100.

Which is which and how to tell?   Just look at the price.

On Sat, Jan 21, 2012 at 9:59 PM, Brad Stockdale b...@shinji.net wrote:
 All,

   I've been on the sidelines of being a time nut for a while now and I'm
 working on getting back into things. Before I drifted away from my hobbies,
 I remember the FE-5680's being around, but I didn't know much about them and
 was more interested in GPSDO's. I think I'd like to help kickstart my
 interest in the area again by picking up a few FE-5680A's from eBay. So, I
 was wondering if there's any certain things I should look for when buying
 some...

   It looks like there's a pretty consistent supply right now on eBay... Are
 there certain sellers that people would recommend?

   I noticed that Option 2 is the RS-232C stuff. Do most on eBay have this
 option?

   Anything in particular I should watch out for?

 Thanks,
 Brad


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-- 

Chris Albertson
Redondo Beach, California

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Re: [time-nuts] HP5328A LEDS driver transistor

2012-01-22 Thread Brooke Clarke

Hi Chris:

To get the LED segments to be the same brightness some form of current limiting is needed and this usually involves
dropping resistors and an active current limiting circuit and that burns up a lot of power.

What does the drive circuit look like?
For example if you connect a scope to a working transistor and look at the base, emitter and collector voltages, what do
you see?

If there's a resistor in series with the LED segments what's the voltage across
it doing?

The mux speed for an LED display is fairly slow so any PNP transistor that can handle the voltages and currents involved
should work.

Have you tried any jelly bean PNPs like the PN2907, 2N3906, 2N4403?

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html

Chris Albertson wrote:

I have an eBay HP5328A counter with two dead digits on the display. I
figured out the problem was two dead transistors. I can swap
transistors with a good digit and the problem moves.

I'd not worked on LED displays before. Turns out only one digit is
lit up at a time, they strobe the digits in sequence. The dead
transistor is the one that controls the all the anodes in the
7-segment LED module. The service manual describes the transistor
like this: part number = 1853-0326, description = TRANSISTOR PNP
SI ... FT-50MHZ
The p/n 1853-0326 cross references to a Motorola MPS-U51. The MPS-U51
data sheet matches the part that fails so I'm sure I got a correct
cross ref.
I took a photo of the dead transistor. It is on .1 perf board for
scale. You can read the 3-326 p/n and see the Motorola M logo.
http://www.dropbox.com/gallery/28915695/1/HP5328A?h=da35c1

I look up the spec in the mps-u51 and see it is a to-220 like case and
can handle 1W. I'm really surprised it burned out as I doubt an LED
requires 1W even if showing an 8. Reading the mps-u51 spec sheet I
see it has a low saturation voltage. Maybe that is why the selected
it as it is being driven by 7400 TTL logic that goes through a
connector and has some resistors involved.

Question: These seem to be hardtop find. Can anyone suggest a good sub

Thanks,
Chris Albertson
Redondo Beach, California

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[time-nuts] Sold: Tek DC510 TM500 Counter (parts or repair)

2012-01-22 Thread Oz-in-DFW

On 1/22/2012 1:14 PM, Oz-in-DFW wrote:
 Unknown, untested, looks to be complete but clearly needs attention.

 Known issues:

 INST ID button is sticky
 Missing a side cover
 CHANNEL B BNC out of round, but looks reshapeable.
 ARM SMB is damaged and will need to be replaced.

 High Res pics at http://www.ozindfw.net/sell/DC510/

 $50 or best offer +$15 shipping in US.  International shipping is
 available, but you'll cover all costs, fees, and tariffs.
-- 
mailto:o...@ozindfw.net
Oz
POB 93167 
Southlake, TX 76092 (Near DFW Airport) 





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Re: [time-nuts] Spectracom 8170 - SWCC clock

Yahoo for real voltage power and current. Teletype style.
Yes indeed the old loop currents seriously worked.
No AA batteries here. ;-)

When will we see a pix of this unit??
Regards
Paul
WB8TSL

On Sat, Jan 21, 2012 at 9:25 PM, Brooke Clarke bro...@pacific.net wrote:

Hi Jim:

There are a number of options.

Ken's clock clinic sells what appears to be a No. 6 Battery that has a
synchronization function for the Western Union clocks.
But the problem with it and the drivers for slave clocks is that they use
fairly low voltage circuitry.

Stock Tickers and Teletype machines are tpically run with loop voltages in
the 60 to 200 Volt range.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.**end2partygovernment.com/**Brooke4Congress.htmlhttp://www.end2partygovernment.com/Brooke4Congress.html

Jim Hickstein wrote:

I have a Spectracom 8170 in the living room (who doesn't?), and a Western
Union time-service clock, a.k.a SWCC clock -- a nice one, in a 3-foot-high
wood case. I've been watching TV with this combination for years and years
but never got around to feeding a pulse from the 8170 to discipline the
other one. Now that Western Union no longer provides the service. :-) But
it just begs to be done.

I did draw up a TTL circuit, once (on a napkin, naturally, which I have
now misplaced), that could live inside the 8170. I figured out the minimum
number of inputs needed to detect when the MM:SS LED displays said 00:00
(for one second). It would close a relay, which could feed the
winding-battery power to the hour-set solenoid down a pair of wires from 10
feet away. But I never built it.

A little over a year ago the TS clock was getting gummy and free-running
slower and slower, so I sent it to the clock hospital. It's back and
free-running nicely, so maybe it's finally time I did this. Anyone got a
better idea than my little TTL circuit, on a breadboard inside the 8170?
I'd like to get it across the rear panel without cutting a new hole, if I
can avoid it. But maybe the right connector would do. Another time-code
receiver in the TS clock, e.g. a GPS module that provides a relay closure
for 1 second on the hour (if such exists) might be neater. But the living
room faces north.

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Re: [time-nuts] Spectracom 8170 - SWCC clock #2

Guess I simply did not read enough threads I see the pix.
Thanks

On Sat, Jan 21, 2012 at 9:42 PM, Brooke Clarke bro...@pacific.net wrote:

Hi again:

Sorry sent too soon.

The time constant of the loop is L/R. By increasing R the loop runs
faster.
Western Union ran the clocks from 200 Volts with a dropping resistor to
get the desired current.

When driven form say 12 Volts the clock response is sluggish, but when
driven from higher voltages the response is very snappy.

I think a simple blocking oscillator could be used to charge up a photo
cap and dump it into one or more series connected clocks.
http://www.prc68.com/I/SWCC.**shtml http://www.prc68.com/I/SWCC.shtml
http://www.prc68.com/I/SWCC2.**shtml http://www.prc68.com/I/SWCC2.shtml
http://www.prc68.com/I/SETSC.**shtml#IMP2http://www.prc68.com/I/SETSC.shtml#IMP2
http://www.prc68.com/I/SWCC.**shtml#Lhttp://www.prc68.com/I/SWCC.shtml#L

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.**end2partygovernment.com/**Brooke4Congress.htmlhttp://www.end2partygovernment.com/Brooke4Congress.html

Brooke Clarke wrote:

Hi Jim:

There are a number of options.

Stock Tickers and Teletype machines are tpically run with loop voltages
in the 60 to 200 Volt range.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.**end2partygovernment.com/**Brooke4Congress.htmlhttp://www.end2partygovernment.com/Brooke4Congress.html

Jim Hickstein wrote:

I have a Spectracom 8170 in the living room (who doesn't?), and a
Western Union time-service clock, a.k.a SWCC clock -- a nice one, in a
3-foot-high wood case. I've been watching TV with this combination for
years and years but never got around to feeding a pulse from the 8170 to
discipline the other one. Now that Western Union no longer provides the
service. :-) But it just begs to be done.

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Re: [time-nuts] Spectracom 8170 - SWCC clock

On 1/22/12 1:56 PM, paul swed wrote:

Yahoo for real voltage power and current. Teletype style.
Yes indeed the old loop currents seriously worked.
No AA batteries here. ;-)

When will we see a pix of this unit??

It's my day off. :-)

Regards
Paul
WB8TSL

On Sat, Jan 21, 2012 at 9:25 PM, Brooke Clarkebro...@pacific.net wrote:

Hi Jim:

There are a number of options.

Stock Tickers and Teletype machines are tpically run with loop voltages in
the 60 to 200 Volt range.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.**end2partygovernment.com/**Brooke4Congress.htmlhttp://www.end2partygovernment.com/Brooke4Congress.html

Jim Hickstein wrote:

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Re: [time-nuts] Spectracom 8170 - SWCC clock

OK Clark put some pix up.

On Sun, Jan 22, 2012 at 2:58 PM, Jim Hickstein j...@jxh.com wrote:

On 1/22/12 1:56 PM, paul swed wrote:

Yahoo for real voltage power and current. Teletype style.
Yes indeed the old loop currents seriously worked.
No AA batteries here. ;-)

When will we see a pix of this unit??

It's my day off. :-)

Regards
Paul
WB8TSL

On Sat, Jan 21, 2012 at 9:25 PM, Brooke Clarkebro...@pacific.net
wrote:

Hi Jim:

There are a number of options.

Stock Tickers and Teletype machines are tpically run with loop voltages
in
the 60 to 200 Volt range.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.**end2partygovernme**nt.com/**Brooke4Congress.htmlhttp://end2partygovernment.com/**Brooke4Congress.html
**http://www.**end2partygovernment.com/**Brooke4Congress.htmlhttp://www.end2partygovernment.com/Brooke4Congress.html

Jim Hickstein wrote:

I have a Spectracom 8170 in the living room (who doesn't?), and a
Western
Union time-service clock, a.k.a SWCC clock -- a nice one, in a
3-foot-high
wood case. I've been watching TV with this combination for years and
years
but never got around to feeding a pulse from the 8170 to discipline the
other one. Now that Western Union no longer provides the service. :-)
But
it just begs to be done.

I did draw up a TTL circuit, once (on a napkin, naturally, which I have
now misplaced), that could live inside the 8170. I figured out the
minimum
number of inputs needed to detect when the MM:SS LED displays said 00:00
(for one second). It would close a relay, which could feed the
winding-battery power to the hour-set solenoid down a pair of wires
from 10
feet away. But I never built it.

A little over a year ago the TS clock was getting gummy and free-running
slower and slower, so I sent it to the clock hospital. It's back and
free-running nicely, so maybe it's finally time I did this. Anyone got
a
better idea than my little TTL circuit, on a breadboard inside the 8170?
I'd like to get it across the rear panel without cutting a new hole,
if I
can avoid it. But maybe the right connector would do. Another
time-code
receiver in the TS clock, e.g. a GPS module that provides a relay
closure
for 1 second on the hour (if such exists) might be neater. But the
living
room faces north.

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Re: [time-nuts] HP5328A LEDS driver transistor

2012-01-22 Thread Charles P. Steinmetz

Chris wrote:

Motorola MPS-U51

I look up the spec in the mps-u51 and see it is a to-220 like case and
can handle 1W.

The Motorola Uniwatt case was not really comfortable dissipating
one watt even in 25 degree free air (the book spec). I used them and
their NPN counterpart, the MPS-U01 in a number of designs in the
early '70s because they were the fastest medium-power transistors
available. We always used them with board-mounted heatsinks (unlike
the TO-220 case, which uses a lead frame and has sturdy leads, the
Uniwatt has flimsy wire leads similar to a TO-5/TO-39 package).

Any switching transistor that will handle 1-2A and has an fT in the
50 MHz range or better should work fine. Note the EBC
pinout. Today, I might replace it with a TO-237 device like the
2N6726/27/28/29/30 from Central Semi (same free-air power rating as
U51, same pinout). But note, same optimistic free-air power spec --
I'd use a clip-on heatsink if I couldn't leave my finger on it indefinitely.

http://www.mouser.com/ProductDetail/Central-Semiconductor/2N6730/?qs=sGAEpiMZZMutXGli8Ay4kEe1J5vCvqdNDTChj11qzcA%3d

These seem to be EOL at this time, but still
available. ZTX953/951/753/751 (Diodes, Inc.) and KSA928A (Fairchild)
are TO-92 devices that also claim high dissipation. Again, use a heatsink.

Best regards,

Charles

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Re: [time-nuts] HP5328A LEDS driver transistor

2012-01-22 Thread Don Latham

NTE lists their equivalent as: NTE-189 See:
http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search
Newark has 262 of them :-)
Don
Chris Albertson
 I have an eBay HP5328A counter with two dead digits on the display.  I
 figured out the problem was two dead transistors.  I can swap
 transistors with a good digit and the problem moves.

 I'd not worked on LED displays before.  Turns out only one digit is
 lit up at a time, they strobe the digits in sequence.  The dead
 transistor is the one that controls the all the anodes in the
 7-segment LED module.  The service manual describes the transistor
 like this:  part number = 1853-0326, description = TRANSISTOR PNP
 SI ... FT-50MHZ
 The p/n 1853-0326 cross references to a Motorola MPS-U51.  The MPS-U51
 data sheet matches the part that fails so I'm sure I got a correct
 cross ref.
 I took a photo of the dead transistor.  It is on .1 perf board for
 scale.   You can read the 3-326 p/n and see the Motorola M logo.
 http://www.dropbox.com/gallery/28915695/1/HP5328A?h=da35c1

 I look up the spec in the mps-u51 and see it is a to-220 like case and
 can handle 1W.  I'm really surprised it burned out as I doubt an LED
 requires 1W even if showing an 8.  Reading the mps-u51 spec sheet I
 see it has a low saturation voltage.  Maybe that is why the selected
 it as it is being driven by 7400 TTL logic that goes through a
 connector and has some resistors involved.

 Question:  These seem to be hardtop find.  Can anyone suggest a good
 sub



 Thanks,
 Chris Albertson
 Redondo Beach, California

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-- 
Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind.
R. Bacon
If you don't know what it is, don't poke it.
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com



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Re: [time-nuts] Spectracom 8170 - SWCC clock


On 2012/01/22 13:58, Jim Hickstein wrote:

On 1/22/12 1:56 PM, paul swed wrote:

Yahoo for real voltage power and current. Teletype style.
Yes indeed the old loop currents seriously worked.
No AA batteries here. ;-)


How far will I get with my 3 D cells?  They make it wind nicely, but I've been 
afraid to try 6V, having read somewhere (probably Brooke's pages) not to exceed 
3V lest one damage something.  Then again, that's the local battery, not the 
setting signal.  (No. 6 dry cell?  Dear me, I hadn't even thought of one of 
those for 40 years.)



When will we see a pix of this unit??


It's my day off. :-)


Then again, what's a day off for, if not this kind of thing?

http://www.flickr.com/photos/jxh1/tags/clock/

Brooke Clarke's pix are nice, but I think I have the nicest SWCC clock out 
there, one of the nicest I've seen.  Coincidentally, I bought it in about 1986 
from a fellow named Clark (last name I don't recall), who was a member of the 
Minnesota horological society, or whatever it's called.  A friend of mine, 
another member, put me on to this, and I jumped at it.  (Actually, he has an 
even nicer one, a big Air Force unit IIRC that's about 6 feet tall, and with a 
mercury pendulum bob.)  Took the thing back home to California, and it came with 
me when I moved back to Minnesota in 2003.  It's been the primary time display 
in my house since I got it.  I also still keep the Textronix carton I scrounged, 
that's a perfect fit, for moving it.


-Jim
K6JXH/0

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[time-nuts] FE-5680 serial command tester

2012-01-22 Thread Scott Newell

Here's some source and a cygwin binary (let me know if I need to do a 
win32 binary) for a little app that will try all the known data 
request commands on your FE-5680.  If you're willing and able, I'd 
like for you to run this against each unit you have before it's 
locked and again after it's locked.  I'd love to see a copy of your 
data and the info from the barcode stickers on the cover.


http://n5tnl.com/time/fe-5680a/control/fe5680_info.exe
http://n5tnl.com/time/fe-5680a/control/fe5680_info.c

From the latest tests on my two working units, I'm pretty sure that 
the 0x61 reply is the unit serial number in asciiz text 
(70716).  0xf0 appears to be some sort of version number in asciiz 
text (3.4 on all mine).  0x2b is a weird one; it appears to be a 
frequency in asciiz text (2000 on one unit, 2000.00 
on the other!).


Thanks for the help everyone!

--
newell  N5TNL


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Re: [time-nuts] Spectracom 8170 - SWCC clock

2012-01-22 Thread Don Latham

NICE!
Measure the resistance of the coil, and see what the current would be
with the voltage you want to use. Figure out what the current might have
been in the original installation. Ebay has an installation manual at
auction for these clocks, may have a description of the driving circuit.
In extremis, measure or estimate the coil wire size and calculate the
heat loss for the actuated time with the voltage you want to use.
Don

Jim Hickstein
 On 2012/01/22 13:58, Jim Hickstein wrote:
 On 1/22/12 1:56 PM, paul swed wrote:
 Yahoo for real voltage power and current. Teletype style.
 Yes indeed the old loop currents seriously worked.
 No AA batteries here. ;-)

 How far will I get with my 3 D cells?  They make it wind nicely, but
 I've been
 afraid to try 6V, having read somewhere (probably Brooke's pages) not to
 exceed
 3V lest one damage something.  Then again, that's the local battery, not
 the
 setting signal.  (No. 6 dry cell?  Dear me, I hadn't even thought of one
 of
 those for 40 years.)

 When will we see a pix of this unit??

 It's my day off. :-)

 Then again, what's a day off for, if not this kind of thing?

 http://www.flickr.com/photos/jxh1/tags/clock/

 Brooke Clarke's pix are nice, but I think I have the nicest SWCC clock
 out
 there, one of the nicest I've seen.  Coincidentally, I bought it in
 about 1986
 from a fellow named Clark (last name I don't recall), who was a member
 of the
 Minnesota horological society, or whatever it's called.  A friend of
 mine,
 another member, put me on to this, and I jumped at it.  (Actually, he
 has an
 even nicer one, a big Air Force unit IIRC that's about 6 feet tall, and
 with a
 mercury pendulum bob.)  Took the thing back home to California, and it
 came with
 me when I moved back to Minnesota in 2003.  It's been the primary time
 display
 in my house since I got it.  I also still keep the Textronix carton I
 scrounged,
 that's a perfect fit, for moving it.

 -Jim
 K6JXH/0

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-- 
Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind.
R. Bacon
If you don't know what it is, don't poke it.
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com



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Re: [time-nuts] HP5328A LEDS driver transistor

2012-01-22 Thread David

The package is a TO-202 with the tab cut off or at least the MPS-U51
uses a TO-202 package.  Be careful when you replace it because the
pinout is EBC which is deprecated in power transistor packages.

Ic = 2.0 A
Vceo = 30 V
Pd = 1 W @ Ta 25 C
hfe = 60 @ 0.1 A
Ft = 50 MHz min

This is a very non-critical application.  I agree with Brooke Clarke
that a 2N4403 will probably work fine.  If you want something closer
then there are any number of TO-126 and TO-225 transistors like the
MJE170 which will work but again, be careful of the pinout.

On Sun, 22 Jan 2012 10:41:23 -0800, Chris Albertson
albertson.ch...@gmail.com wrote:

I have an eBay HP5328A counter with two dead digits on the display.  I
figured out the problem was two dead transistors.  I can swap
transistors with a good digit and the problem moves.

I'd not worked on LED displays before.  Turns out only one digit is
lit up at a time, they strobe the digits in sequence.  The dead
transistor is the one that controls the all the anodes in the
7-segment LED module.  The service manual describes the transistor
like this:  part number = 1853-0326, description = TRANSISTOR PNP
SI ... FT-50MHZ
The p/n 1853-0326 cross references to a Motorola MPS-U51.  The MPS-U51
data sheet matches the part that fails so I'm sure I got a correct
cross ref.
I took a photo of the dead transistor.  It is on .1 perf board for
scale.   You can read the 3-326 p/n and see the Motorola M logo.
http://www.dropbox.com/gallery/28915695/1/HP5328A?h=da35c1

I look up the spec in the mps-u51 and see it is a to-220 like case and
can handle 1W.  I'm really surprised it burned out as I doubt an LED
requires 1W even if showing an 8.  Reading the mps-u51 spec sheet I
see it has a low saturation voltage.  Maybe that is why the selected
it as it is being driven by 7400 TTL logic that goes through a
connector and has some resistors involved.

Question:  These seem to be hardtop find.  Can anyone suggest a good sub

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Re: [time-nuts] mixers for frequency measurement

2012-01-22 Thread Magnus Danielson


On 01/21/2012 06:13 PM, Ulrich Bangert wrote:

Magnus,


The end result will be that the instrument limit slope hits the level of the 
stable source much earlier.


Can you elaborate this claim a bit more? I Think I do not understand it in the 
correct way.


You have a 1/f amplitude slope from the instruments measurement limit. 
What you see when you measure is a combination of the instruments 
limitation (the slope) and the actual noise-source curve. The 
intercept-point between them depends on the instruments noise level.
Hence, the instruments measurement limit will dominate for lower taus if 
you have a quiet enough source.



It's more of a practical limitation of getting all those readouts that I wonder 
about.


It is not all those readouts! The counters do the averaging inside, giving an 
overall measurement rate of 1/s. the external arming of 1000/s is just for keeping Tau 
exactly at 1s.


OK. Have you measured the dead-times? Unknown or worse, unstable 
dead-time can be a limiting aspect. Dead-time can be compensated, but it 
seems it is an art that gone out of fashion.



I also have another project on a FPGA ongoing with a DDMTD test, but last time 
I tried things I ended up with a tool problem.


I would never claim that FPGAs are bad for time nuts projects in
general but my own experiences (I tried things like programmable
dividers, linear phase comparators and ps TI interval measurements)
with FPGAs have all shown heavy problems because of unwanted
analogue like interactions inside the FPGA that are difficult
to deal with since we lack to opportunity to put a blocking C here
ore there inside the FPGA. These effects in the sub nanosecond
region are irrelevant for all other kind of electronics including
VERY fast logic but the can be a disaster for time nuts.


If one beleives that the FPGA is a precision timing by itself, you are 
bound to have problems. It is a handy and programmable lump of logic and 
gates. For precision timing you need a clean front-end, but then let 
data-collection and high-speed dataprocessing occur in the FPGA.


For a DDMTD for instance, while the the FPGA does the full function, 
putting a pair of real DFFs up-front will clean things up and the FPGA 
side will only act as a recording device as the timing separation has 
already been done in the front-end.


Cheers,
Magnus

Cheers,
Magnus

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[time-nuts] Thunderbolt GPS TimeKeeper

2012-01-22 Thread Dennis Czelusniak

As of 01 January 2012 all three of my systems began to Sync.the 
year  incorrectly. I am using Trimble TimeKeeper ver. 1.02. The year 2020 now 
appears on my PC's, the time however is correct. I use Windows NT, XP, and 
Vista. The Date is correct when displayed in TBoltMon. I reinstalled the 
software on a spare PC that is not connected to  my network, same results. Is 
there a fix somewhere or am I overlooking something obvious?
Regards, Dennis WD8DCJ
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Re: [time-nuts] Spectracom 8170 - SWCC clock

Nice pixs
I would think that the setting winding would be of the old teletype loop
voltage and current and that the local winding battery as mentioned would
have been 3-6 VDC.
Nice looking clock lucky you to find such an instrument.
Regards
Paul.

On Sun, Jan 22, 2012 at 3:49 PM, Jim Hickstein j...@jxh.com wrote:

On 2012/01/22 13:58, Jim Hickstein wrote:

On 1/22/12 1:56 PM, paul swed wrote:

Yahoo for real voltage power and current. Teletype style.
Yes indeed the old loop currents seriously worked.
No AA batteries here. ;-)

How far will I get with my 3 D cells? They make it wind nicely, but I've
been afraid to try 6V, having read somewhere (probably Brooke's pages) not
to exceed 3V lest one damage something. Then again, that's the local
battery, not the setting signal. (No. 6 dry cell? Dear me, I hadn't even
thought of one of those for 40 years.)

When will we see a pix of this unit??

It's my day off. :-)

Then again, what's a day off for, if not this kind of thing?

http://www.flickr.com/photos/**jxh1/tags/clock/http://www.flickr.com/photos/jxh1/tags/clock/

Brooke Clarke's pix are nice, but I think I have the nicest SWCC clock out
there, one of the nicest I've seen. Coincidentally, I bought it in about
1986 from a fellow named Clark (last name I don't recall), who was a member
of the Minnesota horological society, or whatever it's called. A friend of
mine, another member, put me on to this, and I jumped at it. (Actually, he
has an even nicer one, a big Air Force unit IIRC that's about 6 feet tall,
and with a mercury pendulum bob.) Took the thing back home to California,
and it came with me when I moved back to Minnesota in 2003. It's been the
primary time display in my house since I got it. I also still keep the
Textronix carton I scrounged, that's a perfect fit, for moving it.

-Jim
K6JXH/0

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Re: [time-nuts] HP5328A LEDS driver transistor

2012-01-22 Thread Stan Searing

A good source of replacement parts for test equipment is Sphere Research (
http://www.sphere.bc.ca/ ).
They don't show any in stock, but you could email.
NTE is a good source for replacement parts, but the NTE189 is really
expensive ($26.73 from Newark
and $30.59 from Mouser).  For the cost of a couple of these you can get a
whole 5328A (I have one or two
on my shelf I'd sell for $50 if you are ever up in San Jose).
I'd use a 
MJE171GOS-NDhttp://search.digikey.com/us/en/products/MJE171G/MJE171GOS-ND/919498
 or 
497-4829-5-NDhttp://search.digikey.com/us/en/products/2SB772/497-4829-5-ND/954133
from
DigiKey (but as mentioned by others,
watch the pinout, as most any power tab transistor will have the collector
in the center,
while the MPS-U51 is one of the few exceptions).  You might also need to
slim down
the leads to fit the PC board.

Stan




On Sun, Jan 22, 2012 at 12:34 PM, Don Latham d...@montana.com wrote:

 NTE lists their equivalent as: NTE-189 See:
 http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search
 Newark has 262 of them :-)
 Don
 Chris Albertson
  I have an eBay HP5328A counter with two dead digits on the display.  I
  figured out the problem was two dead transistors.  I can swap
  transistors with a good digit and the problem moves.
 
  I'd not worked on LED displays before.  Turns out only one digit is
  lit up at a time, they strobe the digits in sequence.  The dead
  transistor is the one that controls the all the anodes in the
  7-segment LED module.  The service manual describes the transistor
  like this:  part number = 1853-0326, description = TRANSISTOR PNP
  SI ... FT-50MHZ
  The p/n 1853-0326 cross references to a Motorola MPS-U51.  The MPS-U51
  data sheet matches the part that fails so I'm sure I got a correct
  cross ref.
  I took a photo of the dead transistor.  It is on .1 perf board for
  scale.   You can read the 3-326 p/n and see the Motorola M logo.
  http://www.dropbox.com/gallery/28915695/1/HP5328A?h=da35c1
 
  I look up the spec in the mps-u51 and see it is a to-220 like case and
  can handle 1W.  I'm really surprised it burned out as I doubt an LED
  requires 1W even if showing an 8.  Reading the mps-u51 spec sheet I
  see it has a low saturation voltage.  Maybe that is why the selected
  it as it is being driven by 7400 TTL logic that goes through a
  connector and has some resistors involved.
 
  Question:  These seem to be hardtop find.  Can anyone suggest a good
  sub
 
 
 
  Thanks,
  Chris Albertson
  Redondo Beach, California
 
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 --
 Neither the voice of authority nor the weight of reason and argument
 are as significant as experiment, for thence comes quiet to the mind.
 R. Bacon
 If you don't know what it is, don't poke it.
 Ghost in the Shell


 Dr. Don Latham AJ7LL
 Six Mile Systems LLP
 17850 Six Mile Road
 POB 134
 Huson, MT, 59846
 VOX 406-626-4304
 www.lightningforensics.com
 www.sixmilesystems.com



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Re: [time-nuts] Spectracom 8170 - SWCC clock


On 2012/01/22 14:56, Don Latham wrote:

NICE!
Measure the resistance of the coil, and see what the current would be
with the voltage you want to use. Figure out what the current might have
been in the original installation. Ebay has an installation manual at
auction for these clocks, may have a description of the driving circuit.


I hate to pay twenty bucks for a PDF, or to pay twenty bucks just to find out. 
If it's anything like this:


http://electric-clocks.com/SWCC/

... it doesn't say.  The winding battery, and the setting signal, were supplied, 
and the installer didn't need to know the specs.  But, then again, I can't 
afford to experiment too broadly and damage my museum piece.  I think the guy 
who recently cleaned and repaired the movement tested this coil.  I'll call him 
back and ask what he put on it.



In extremis, measure or estimate the coil wire size and calculate the
heat loss for the actuated time with the voltage you want to use.
Don


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Re: [time-nuts] Spectracom 8170 - SWCC clock

2012-01-22 Thread Bob Camp

Teletype loop current as in 20 ma through the coil via a dropping resistor off
of 125 vdc.

Bob

On Jan 22, 2012, at 4:06 PM, paul swed paulsw...@gmail.com wrote:

On Sun, Jan 22, 2012 at 3:49 PM, Jim Hickstein j...@jxh.com wrote:

On 2012/01/22 13:58, Jim Hickstein wrote:

On 1/22/12 1:56 PM, paul swed wrote:

Yahoo for real voltage power and current. Teletype style.
Yes indeed the old loop currents seriously worked.
No AA batteries here. ;-)

When will we see a pix of this unit??

It's my day off. :-)

Then again, what's a day off for, if not this kind of thing?

http://www.flickr.com/photos/**jxh1/tags/clock/http://www.flickr.com/photos/jxh1/tags/clock/

-Jim
K6JXH/0

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Re: [time-nuts] Thunderbolt GPS TimeKeeper

2012-01-22 Thread Paul F. Sehorne

Where does one find Trimble Timekeeper software?  and documentation on 
how to use it?


Thanks,
Paul

On 1/22/2012 3:06 PM, Dennis Czelusniak wrote:

As of 01 January 2012 all three of my systems began to Sync.the year  
incorrectly. I am using Trimble TimeKeeper ver. 1.02. The year 2020 now appears 
on my PC's, the time however is correct. I use Windows NT, XP, and Vista. The 
Date is correct when displayed in TBoltMon. I reinstalled the software on a 
spare PC that is not connected to  my network, same results. Is there a fix 
somewhere or am I overlooking something obvious?
Regards, Dennis WD8DCJ
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Re: [time-nuts] Thunderbolt GPS TimeKeeper

If you are keeping a network of PCs in sync to time the software to
use is NTP.
http://www.ntp.org/
NTP cansyncto your GPS(s) and to other NTP severs out on the Internet.


On Sun, Jan 22, 2012 at 1:06 PM, Dennis Czelusniak
czelusni...@yahoo.com wrote:
 As of 01 January 2012 all three of my systems began to Sync.the 
 year  incorrectly. I am using Trimble TimeKeeper ver. 1.02. The year 2020 now 
 appears on my PC's, the time however is correct. I use Windows NT, XP, and 
 Vista. The Date is correct when displayed in TBoltMon. I reinstalled the 
 software on a spare PC that is not connected to  my network, same results. Is 
 there a fix somewhere or am I overlooking something obvious?
 Regards, Dennis WD8DCJ
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-- 

Chris Albertson
Redondo Beach, California

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Re: [time-nuts] Spectracom 8170 - SWCC clock

2012-01-22 Thread Brooke Clarke

Hi:

Synchronizer coil data at:
http://www.prc68.com/I/SWCC.shtml#SC - old 2 coil sync
and
http://www.prc68.com/I/SWCC2.shtml#SC - newer single coil sync

The WU central office used a 200 VDC supply and the loop drove a number of series connected sync coils. A large ceramic
tube variable resistor was used to set the loop current.
It's amazing how much snappier the sync action is when the loop resistance is raised, i.e. shorter time constant/higher
loop voltage.
I think something like a throwaway camera flash circuit could be charged up maybe a minute before the top of the hour
and then dumped into the sync coil a few (TBD) ms prior to the exact top of the hour.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html

Jim Hickstein wrote:

On 2012/01/22 14:56, Don Latham wrote:

NICE!
Measure the resistance of the coil, and see what the current would be
with the voltage you want to use. Figure out what the current might have
been in the original installation. Ebay has an installation manual at
auction for these clocks, may have a description of the driving circuit.

I hate to pay twenty bucks for a PDF, or to pay twenty bucks just to find out.
If it's anything like this:

http://electric-clocks.com/SWCC/

... it doesn't say. The winding battery, and the setting signal, were supplied, and the installer didn't need to know
the specs. But, then again, I can't afford to experiment too broadly and damage my museum piece. I think the guy who
recently cleaned and repaired the movement tested this coil. I'll call him back and ask what he put on it.

In extremis, measure or estimate the coil wire size and calculate the
heat loss for the actuated time with the voltage you want to use.
Don

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Re: [time-nuts] HP5328A LEDS driver transistor

Thanks everyone for all the options.  OK there are real MPS-U51 for $5
or $6 each.  The NTE parts sells for between $25 and $30.   HP places
these just on top of each digit with the tap fasting the plastic LED
so it can't short.  HP also cuts the taps so they can't short to the
case.  I think they grossly per spec'd them because they are used in a
place where there is no heat sink and very little airflow.   I say
over spec but yet two burn out.

Funny the seller thought the counter worked.  The burned out digits
were the least significant and with them out you still have a 7
digital counter.  Really all that most people need for aligning radios
and such.

My plan now is to do a parametric search on Digikey/Mouser a quick
search found many for under $1 that could work.  I'll wait 'till I'm
in need of some parts to build my next projects and add a few
transistors.


On Sun, Jan 22, 2012 at 1:07 PM, Stan Searing timenuts...@gmail.com wrote:

 on my shelf I'd sell for $50 if you are ever up in San Jose).

If you could drop them at Cal State I might take you up on that.
Yes,  I'll look at that transistor below

 I'd use a 
 MJE171GOS-NDhttp://search.digikey.com/us/en/products/MJE171G/MJE171GOS-ND/919498
  or 
 497-4829-5-NDhttp://search.digikey.com/us/en/products/2SB772/497-4829-5-ND/954133
 from
 DigiKey (but as mentioned by others,
 watch the pinout, as most any power tab transistor will have the collector
 in the center,
 while the MPS-U51 is one of the few exceptions).  You might also need to
 slim down
 the leads to fit the PC board.

 Stan




 On Sun, Jan 22, 2012 at 12:34 PM, Don Latham d...@montana.com wrote:

 NTE lists their equivalent as: NTE-189 See:
 http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search
 Newark has 262 of them :-)
 Don
 Chris Albertson
  I have an eBay HP5328A counter with two dead digits on the display.  I
  figured out the problem was two dead transistors.  I can swap
  transistors with a good digit and the problem moves.
 
  I'd not worked on LED displays before.  Turns out only one digit is
  lit up at a time, they strobe the digits in sequence.  The dead
  transistor is the one that controls the all the anodes in the
  7-segment LED module.  The service manual describes the transistor
  like this:  part number = 1853-0326, description = TRANSISTOR PNP
  SI ... FT-50MHZ
  The p/n 1853-0326 cross references to a Motorola MPS-U51.  The MPS-U51
  data sheet matches the part that fails so I'm sure I got a correct
  cross ref.
  I took a photo of the dead transistor.  It is on .1 perf board for
  scale.   You can read the 3-326 p/n and see the Motorola M logo.
  http://www.dropbox.com/gallery/28915695/1/HP5328A?h=da35c1
 
  I look up the spec in the mps-u51 and see it is a to-220 like case and
  can handle 1W.  I'm really surprised it burned out as I doubt an LED
  requires 1W even if showing an 8.  Reading the mps-u51 spec sheet I
  see it has a low saturation voltage.  Maybe that is why the selected
  it as it is being driven by 7400 TTL logic that goes through a
  connector and has some resistors involved.
 
  Question:  These seem to be hardtop find.  Can anyone suggest a good
  sub
 
 
 
  Thanks,
  Chris Albertson
  Redondo Beach, California
 
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 --
 Neither the voice of authority nor the weight of reason and argument
 are as significant as experiment, for thence comes quiet to the mind.
 R. Bacon
 If you don't know what it is, don't poke it.
 Ghost in the Shell


 Dr. Don Latham AJ7LL
 Six Mile Systems LLP
 17850 Six Mile Road
 POB 134
 Huson, MT, 59846
 VOX 406-626-4304
 www.lightningforensics.com
 www.sixmilesystems.com



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-- 

Chris Albertson
Redondo Beach, California

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Re: [time-nuts] Spectracom 8170 - SWCC clock


On 2012/01/22 15:29, Bob Camp wrote:

Hi

Teletype loop current as in 20 ma through the coil via a dropping resistor off 
of 125 vdc.


Value for the dropping resistor?  (I know, I'm an Extra, and I used to design 
digital circuits, so I should know this stuff.  But I've been in software for a 
long time.  Let's see E over I R.)


I measured the setting coil at the terminals: 11.5 ohms.  To limit 125 VDC to 
20mA, this would need an additional 6.2 Kohms.  I suppose that represents the 
metallic circuit back to WU plus a bunch of other 11.5-ohm clocks on the same 
circuit, plus a compensating resistor back at the head end?


Locally, a D cell (or 3 in series, which I have), with about 200 more ohms, 
might do.  (Reaches into desk drawer.)  Let's see if I still have that bunch of 
100-ohm resistors left over from making an ISDN terminator.  Why, yes! 
Quarter-watt.  P over I E.  90mW.  Eh, it probably won't blow up.


I tried measuring the winding coil, too: 0.1 ohms, but I'm not sure I was 
getting it in the right place.  And now I've put the face back on the clock. 
Otherwise I couldn't tell what time it was!  I am really trained to look at that 
spot on the wall for this information.  While the SWCC was in the hospital (for 
over a year) I had to buy another clock to put there.  The blank spot was 
driving me crazy.


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Re: [time-nuts] Spectracom 8170 - SWCC clock

2012-01-22 Thread Brooke Clarke

Hi Jim:

On web page:
http://www.prc68.com/I/SWCC2.shtml#SC

I have data from Henry W. that says 120 V (my memory was wrong on the 200 V)
and he says 250 ma.
This will give about 66 times faster response time than using 3 Volts.

I'm spending time on this because with low loop voltage the action is so sluggish that it will barely work or for a
clock that's not brand new and properly oiled may not work at all.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html

Jim Hickstein wrote:

On 2012/01/22 15:29, Bob Camp wrote:

Teletype loop current as in 20 ma through the coil via a dropping resistor off
of 125 vdc.

Value for the dropping resistor? (I know, I'm an Extra, and I used to design digital circuits, so I should know this
stuff. But I've been in software for a long time. Let's see E over I R.)

I measured the setting coil at the terminals: 11.5 ohms. To limit 125 VDC to 20mA, this would need an additional 6.2
Kohms. I suppose that represents the metallic circuit back to WU plus a bunch of other 11.5-ohm clocks on the same
circuit, plus a compensating resistor back at the head end?

Locally, a D cell (or 3 in series, which I have), with about 200 more ohms, might do. (Reaches into desk drawer.)
Let's see if I still have that bunch of 100-ohm resistors left over from making an ISDN terminator. Why, yes!
Quarter-watt. P over I E. 90mW. Eh, it probably won't blow up.

I tried measuring the winding coil, too: 0.1 ohms, but I'm not sure I was getting it in the right place. And now I've
put the face back on the clock. Otherwise I couldn't tell what time it was! I am really trained to look at that spot
on the wall for this information. While the SWCC was in the hospital (for over a year) I had to buy another clock to
put there. The blank spot was driving me crazy.

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Re: [time-nuts] Spectracom 8170 - SWCC clock


On 2012/01/22 17:03, Brooke Clarke wrote:

Hi Jim:

On web page:
http://www.prc68.com/I/SWCC2.shtml#SC

I have data from Henry W. that says 120 V (my memory was wrong on the 200 V) and
he says 250 ma.
This will give about 66 times faster response time than using 3 Volts.


Oh, I was reading the dual-coil section.


I'm spending time on this because with low loop voltage the action is so
sluggish that it will barely work or for a clock that's not brand new and
properly oiled may not work at all.


Got it, thanks.  Since I have 4.5V easily obtainable, and a freshly cleaned and 
oiled clock, I may give that a shot first, with or without the 200 ohms.  Then 
I'll know better what you're talking about.


I don't mind if it's a little sluggish.  I just want to keep the thing from 
drifting a minute a week, which is about where I have the pendulum adjusted now. 
 The local temperature variations introduce significant error.  The pendulum 
rod seems to be of wood, without much in the way of temperature compensation. 
But of course, with the setting signal, it didn't need to free-run with high 
accuracy.


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Re: [time-nuts] HP5328A LEDS driver transistor

2012-01-22 Thread Robert LaJeunesse

Specifying the digit scan transistor is a bit tricky, and often power 
dissipation is just not a concern. Why? Consider the duty cycle. A transistor 
switching one amp (a LOT for 7+1 segments) with a 0.6V saturation dissipates 
600mW, but only when on. Given a 1/8 duty cycle that's 75mW average. Any 
stinkin 
TO-92 will handle that power all day long! Only an ultra-conservative design 
would use an exposed tab transistor, as expected for HP!

Trust me, I put over 20,000 digit drive transistors to work in Terminal One 
O'Hare. Non-Darlington TO-220 parts switching 6A each at 1/16 duty, mounted 
with 
a plastic rivit to nothing more than a small foil pad on 2-sided FR-4 PCB. 
Dissipation was less than 200mW apiece. Still working last I knew, after some 
25 
years. FWIW it was the LEDs that needed cooling, especially with 19,000 LEDs in 
one baggage claim sign.

Bob LaJeunesse



From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, January 22, 2012 5:40:50 PM
Subject: Re: [time-nuts] HP5328A LEDS driver transistor

Thanks everyone for all the options.  OK there are real MPS-U51 for $5
or $6 each.  The NTE parts sells for between $25 and $30.  HP places
these just on top of each digit with the tap fasting the plastic LED
so it can't short.  HP also cuts the taps so they can't short to the
case.  I think they grossly per spec'd them because they are used in a
place where there is no heat sink and very little airflow.  I say
over spec but yet two burn out.

Funny the seller thought the counter worked.  The burned out digits
were the least significant and with them out you still have a 7
digital counter.  Really all that most people need for aligning radios
and such.

My plan now is to do a parametric search on Digikey/Mouser a quick
search found many for under $1 that could work.  I'll wait 'till I'm
in need of some parts to build my next projects and add a few
transistors.


On Sun, Jan 22, 2012 at 1:07 PM, Stan Searing timenuts...@gmail.com wrote:

 on my shelf I'd sell for $50 if you are ever up in San Jose).

If you could drop them at Cal State I might take you up on that.
Yes,  I'll look at that transistor below

 I'd use a 
MJE171GOS-NDhttp://search.digikey.com/us/en/products/MJE171G/MJE171GOS-ND/919498

  or 
497-4829-5-NDhttp://search.digikey.com/us/en/products/2SB772/497-4829-5-ND/954133

 from
 DigiKey (but as mentioned by others,
 watch the pinout, as most any power tab transistor will have the collector
 in the center,
 while the MPS-U51 is one of the few exceptions).  You might also need to
 slim down
 the leads to fit the PC board.

 Stan




 On Sun, Jan 22, 2012 at 12:34 PM, Don Latham d...@montana.com wrote:

 NTE lists their equivalent as: NTE-189 See:
 http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search
 Newark has 262 of them :-)
 Don
 Chris Albertson
  I have an eBay HP5328A counter with two dead digits on the display.  I
  figured out the problem was two dead transistors.  I can swap
  transistors with a good digit and the problem moves.
 
  I'd not worked on LED displays before.  Turns out only one digit is
  lit up at a time, they strobe the digits in sequence.  The dead
  transistor is the one that controls the all the anodes in the
  7-segment LED module.  The service manual describes the transistor
  like this:  part number = 1853-0326, description = TRANSISTOR PNP
  SI ... FT-50MHZ
  The p/n 1853-0326 cross references to a Motorola MPS-U51.  The MPS-U51
  data sheet matches the part that fails so I'm sure I got a correct
  cross ref.
  I took a photo of the dead transistor.  It is on .1 perf board for
  scale.   You can read the 3-326 p/n and see the Motorola M logo.
  http://www.dropbox.com/gallery/28915695/1/HP5328A?h=da35c1
 
  I look up the spec in the mps-u51 and see it is a to-220 like case and
  can handle 1W.  I'm really surprised it burned out as I doubt an LED
  requires 1W even if showing an 8.  Reading the mps-u51 spec sheet I
  see it has a low saturation voltage.  Maybe that is why the selected
  it as it is being driven by 7400 TTL logic that goes through a
  connector and has some resistors involved.
 
  Question:  These seem to be hardtop find.  Can anyone suggest a good
  sub
 
 
 
  Thanks,
  Chris Albertson
  Redondo Beach, California
 
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 --
 Neither the voice of authority nor the weight of reason and argument
 are as significant as experiment, for thence comes quiet to the mind.
 R. Bacon
 If you don't know what it is, don't poke it.
 Ghost in the Shell


 Dr. Don Latham AJ7LL
 Six Mile Systems LLP
 17850 Six Mile Road
 POB 134
 Huson, MT, 59846
 VOX 406-626-4304
 www.lightningforensics.com
 www.sixmilesystems.com

Re: [time-nuts] HP5328A LEDS driver transistor

2012-01-22 Thread Chris Stake


Chris,
Try BC327 / BC328, they are pinout-compatible if you fit them flipped.
On paper they are less powerful but the high gain and low saturation voltage
works in your favour. I have used them for anode drivers in seven segment
displays. Inexpensive, worth a try!
Kind regards

Chris

 -Original Message-
 From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
 Behalf Of Chris Albertson
 Sent: 22 January 2012 22:41
 To: Discussion of precise time and frequency measurement
 Subject: Re: [time-nuts] HP5328A LEDS driver transistor
 
 Thanks everyone for all the options.  OK there are real MPS-U51 for $5
 or $6 each.  The NTE parts sells for between $25 and $30.   HP places
 these just on top of each digit with the tap fasting the plastic LED
 so it can't short.  HP also cuts the taps so they can't short to the
 case.  I think they grossly per spec'd them because they are used in a
 place where there is no heat sink and very little airflow.   I say
 over spec but yet two burn out.
 
 Funny the seller thought the counter worked.  The burned out digits
 were the least significant and with them out you still have a 7
 digital counter.  Really all that most people need for aligning radios
 and such.
 
 My plan now is to do a parametric search on Digikey/Mouser a quick
 search found many for under $1 that could work.  I'll wait 'till I'm
 in need of some parts to build my next projects and add a few
 transistors.
 
 
 On Sun, Jan 22, 2012 at 1:07 PM, Stan Searing timenuts...@gmail.com
 wrote:
 
  on my shelf I'd sell for $50 if you are ever up in San Jose).
 
 If you could drop them at Cal State I might take you up on that.
 Yes,  I'll look at that transistor below
 
  I'd use a MJE171GOS-
 NDhttp://search.digikey.com/us/en/products/MJE171G/MJE171GOS-ND/919498
   or 497-4829-5-NDhttp://search.digikey.com/us/en/products/2SB772/497-
 4829-5-ND/954133
  from
  DigiKey (but as mentioned by others,
  watch the pinout, as most any power tab transistor will have the
 collector
  in the center,
  while the MPS-U51 is one of the few exceptions).  You might also need to
  slim down
  the leads to fit the PC board.
 
  Stan
 
 
 
 
  On Sun, Jan 22, 2012 at 12:34 PM, Don Latham d...@montana.com wrote:
 
  NTE lists their equivalent as: NTE-189 See:
  http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search
  Newark has 262 of them :-)
  Don
  Chris Albertson
   I have an eBay HP5328A counter with two dead digits on the display.
  I
   figured out the problem was two dead transistors.  I can swap
   transistors with a good digit and the problem moves.
  
   I'd not worked on LED displays before.  Turns out only one digit is
   lit up at a time, they strobe the digits in sequence.  The dead
   transistor is the one that controls the all the anodes in the
   7-segment LED module.  The service manual describes the transistor
   like this:  part number = 1853-0326, description = TRANSISTOR PNP
   SI ... FT-50MHZ
   The p/n 1853-0326 cross references to a Motorola MPS-U51.  The MPS-
 U51
   data sheet matches the part that fails so I'm sure I got a correct
   cross ref.
   I took a photo of the dead transistor.  It is on .1 perf board for
   scale.   You can read the 3-326 p/n and see the Motorola M logo.
   http://www.dropbox.com/gallery/28915695/1/HP5328A?h=da35c1
  
   I look up the spec in the mps-u51 and see it is a to-220 like case
 and
   can handle 1W.  I'm really surprised it burned out as I doubt an LED
   requires 1W even if showing an 8.  Reading the mps-u51 spec sheet I
   see it has a low saturation voltage.  Maybe that is why the selected
   it as it is being driven by 7400 TTL logic that goes through a
   connector and has some resistors involved.
  
   Question:  These seem to be hardtop find.  Can anyone suggest a good
   sub
  
  
  
   Thanks,
   Chris Albertson
   Redondo Beach, California
  
   ___
   time-nuts mailing list -- time-nuts@febo.com
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   https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
   and follow the instructions there.
  
 
 
  --
  Neither the voice of authority nor the weight of reason and argument
  are as significant as experiment, for thence comes quiet to the mind.
  R. Bacon
  If you don't know what it is, don't poke it.
  Ghost in the Shell
 
 
  Dr. Don Latham AJ7LL
  Six Mile Systems LLP
  17850 Six Mile Road
  POB 134
  Huson, MT, 59846
  VOX 406-626-4304
  www.lightningforensics.com
  www.sixmilesystems.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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 bin/mailman/listinfo/time-nuts
  and follow the instructions there.
 
 
 
 --
 
 Chris Albertson
 Redondo Beach,

Re: [time-nuts] Spectracom 8170 - SWCC clock

2012-01-22 Thread Bob Camp

Hi

6K is about right. The resistor was typically a big ceramic wire wound 10K 
variable.

No guarantee it's right for a clock, just that it's right for a teletype.

Bob



On Jan 22, 2012, at 5:46 PM, Jim Hickstein j...@jxh.com wrote:

 On 2012/01/22 15:29, Bob Camp wrote:
 Hi
 
 Teletype loop current as in 20 ma through the coil via a dropping resistor 
 off of 125 vdc.
 
 Value for the dropping resistor?  (I know, I'm an Extra, and I used to design 
 digital circuits, so I should know this stuff.  But I've been in software for 
 a long time.  Let's see E over I R.)
 
 I measured the setting coil at the terminals: 11.5 ohms.  To limit 125 VDC to 
 20mA, this would need an additional 6.2 Kohms.  I suppose that represents the 
 metallic circuit back to WU plus a bunch of other 11.5-ohm clocks on the same 
 circuit, plus a compensating resistor back at the head end?
 
 Locally, a D cell (or 3 in series, which I have), with about 200 more ohms, 
 might do.  (Reaches into desk drawer.)  Let's see if I still have that bunch 
 of 100-ohm resistors left over from making an ISDN terminator.  Why, yes! 
 Quarter-watt.  P over I E.  90mW.  Eh, it probably won't blow up.
 
 I tried measuring the winding coil, too: 0.1 ohms, but I'm not sure I was 
 getting it in the right place.  And now I've put the face back on the clock. 
 Otherwise I couldn't tell what time it was!  I am really trained to look at 
 that spot on the wall for this information.  While the SWCC was in the 
 hospital (for over a year) I had to buy another clock to put there.  The 
 blank spot was driving me crazy.
 
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[time-nuts] GPIB programming 'íb' style

2012-01-22 Thread Luis Cupido


Is it possible to program under Windows, still
using the old_style national instruments 'ib...' calls.
when using USB-GPIB interfaces like prologix or others ?

many tks.

Luis Cupido.
ct1dmk.

p.s.(I only have real GPIB 'c' programming experience on MSDOS
all the rest is using high level stuff like labview. I have
no clue about what GPIB-USB does when we leave
the 'automagic' install  use scenario).

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[time-nuts] Ocean Optics HR2000 USB Spectrometers

2012-01-22 Thread J. Forster

Hi,

In response to several off-list queries, I contacted Roland Guilmet to see
if he still had any available.

In another development, a Group member has been able to change the
wavelength limits of the scan, without opening the unit, so two can be
paralleled to cover the visible spectrum.


Roland responded:

The Spectros are $110 including shipping via Flat Rate Box. I still have
some.

Regards,
Roland


His email address is: roland.cuil...@yahoo.com

PLEASE, if you are interested, contact him directly, not via this list or me.

Best,

-John

===




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Re: [time-nuts] Ocean Optics HR2000 USB Spectrometers

2012-01-22 Thread Peter Gottlieb


Typo on his email...  it is roland.guil...@yahoo.com


On 1/22/2012 9:40 PM, J. Forster wrote:

Hi,

In response to several off-list queries, I contacted Roland Guilmet to see
if he still had any available.

In another development, a Group member has been able to change the
wavelength limits of the scan, without opening the unit, so two can be
paralleled to cover the visible spectrum.


Roland responded:

The Spectros are $110 including shipping via Flat Rate Box. I still have
some.

Regards,
Roland


His email address is: roland.cuil...@yahoo.com

PLEASE, if you are interested, contact him directly, not via this list or me.

Best,

-John

===




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-
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1416 / Virus Database: 2109/4760 - Release Date: 01/22/12




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[time-nuts] Ocean Optics HR2000 USB Spectrometers... Correction

2012-01-22 Thread J. Forster

I made a typo. the correct email for Roland is:

roland.guil...@yahoo.com


Hi,

In response to several off-list queries, I contacted Roland Guilmet to see
if he still had any available.

In another development, a Group member has been able to change the
wavelength limits of the scan, without opening the unit, so two can be
paralleled to cover the visible spectrum.


Roland responded:

The Spectros are $110 including shipping via Flat Rate Box. I still have
some.

Regards,
Roland


His email address is: roland.guil...@yahoo.com

PLEASE, if you are interested, contact him directly, not via this list or me.

Best,

-John

===








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[time-nuts] Datum1000B service info

2012-01-22 Thread Mark Spencer

Just wondering if anyone has any service info for the Datum 1000B.

My new to me unit may have a few issues (:   

 (The unit seems to work okay for a day or so then the phase of the output 
fluctuates slightly with a period of a few hundred seconds or so.)  It's only 
been powered up for less than a week so I'm not ready to start tearing it apart 
yet.

The performance when it is working okay is considerably better than spec and 
it's helped confirm the performance of my FTS 1050 which was the main reason I 
acquired the unit so this acquisition has not been a total loss.

The packaging of the unit was less than stelar in my view so it may have 
sustained some shocks in transport, but nothing rattled when I received the 
package.

Any comments would be appreciated.

Regards Mark S



Sent from my iPad
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Re: [time-nuts] GPIB programming 'íb' style

On Sun, Jan 22, 2012 at 6:24 PM, Luis Cupido cup...@mail.ua.pt wrote:
 Is it possible to program under Windows, still
 using the old_style national instruments 'ib...' calls.
 when using USB-GPIB interfaces like prologix or others ?

 p.s.(I only have real GPIB 'c' programming experience on MSDOS...

I think the big different between DOS and Windows will be the windows
programs are structured differently.   With MSDOS you own the
computer and there is nothing else going on.  It is like programming
an embedded micro controller.   With Windows you respond to events.
For example in DOS to read once every second you would do the read, do
a one second delay and then loop back.  In Windows you'd start a one
second timer and then do your read as a response to the timer event.
No delay loop.
-- 

Chris Albertson
Redondo Beach, California

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[time-nuts] FE-5680 ADC vs. supply voltage

2012-01-22 Thread Scott Newell

Here's a graph of the ADC readings as I dropped the power supply 
voltage from 18V down to 6V on my non-locking FE-5680:


http://n5tnl.com/time/fe-5680a/graphs/unit_1_volttest.png

I'd hoped that channel 2 would have been a supply voltage, but it 
isn't, or it's one of the low voltage regulated rails.  I was 
surprised to see the channel 4 (still assuming it's VCXO related?) 
swing change with supply voltage.


--
newell  N5TNL


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Re: [time-nuts] HP5328A LEDS driver transistor