Re: [time-nuts] NMEA reader?

2010-01-07 Thread James R. Gorr
Hyper-term is free and gives a window with lat, long, time and the usual other 
stuff.

VisualGPS  (http://www.visualgps.net/) is free and provides a nice gui wrapper 
around above info.

Jamie

--- On Thu, 1/7/10, Jim Mandaville  wrote:

> From: Jim Mandaville 
> Subject: [time-nuts] NMEA reader?
> To: "Discussion of precise time and frequency measurement" 
> 
> Date: Thursday, January 7, 2010, 6:42 PM
> I'm totally new to this semi-DIY gps
> stuff.  Can anyone recommend any NMEA packet reader
> software that will work on my old Windows 98 laptop (using
> data through the RS-232 serial)?.   Searching
> online I find a lot of rather expensive software that does
> much more than I want to do.  Any shareware or
> cheapware that just gives a window with lat, long, time and
> the usual other stuff?
> 
> Jim
> 
> 
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Re: [time-nuts] thunderbolts not seeing satellites

2010-01-04 Thread James R. Gorr
It took some time, but I got both to work when connected directly to the 
antenna.  

So I would have to think that the antenna (or the LNA) has degraded over time 
and is producing very marginal signal strength, barely enough for the Tbolts to 
operate.  I am happy my Tbols are fine!  The Lucent antenna I am using is the 
one Björn posted a photo of.  I do have an HP 53582A and a Motorola antenna (I 
think the Motorola antenna only has 26db of gain like the Lucent).  

I guess the Tbolts just require a little more signal strength to operate 
properly.

Thanks Said for the gentle pointer to the recent discussion.  With the baby I 
don't get as much time to keep up with the list and I missed the whole thread.

I will make a new mount for my HP antenna and get it up on the roof.  I don't 
have the snow issues in Las Vegas that others might have. :-)

Jamie

--- On Sun, 1/3/10, saidj...@aol.com  wrote:

> From: saidj...@aol.com 
> Subject: Re: [time-nuts] thunderbolts not seeing satellites
> To: time-nuts@febo.com
> Date: Sunday, January 3, 2010, 5:56 PM
> Hello Jamie,
>  
> about a month ago there was a long thread that thoroughly
> discussed  the 
> problems folks have been seeing when running Thunderbolts
> through  splitters.
> 
> You may want to search the archive, and take a look..
>  
> bye,
> Said
>  
>  
> In a message dated 1/3/2010 17:42:07 Pacific Standard
> Time,  
> jlt...@worldnet.att.net
> writes:
> 
> Have you  tried running it directly to the antenna,
> minus the  splitter?
> 
> Joe
> 
> -Original Message-
> From:  time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com]
> On
> Behalf Of  James R. Gorr
> Sent: Sunday, January 03, 2010 2:14 PM
> To:  time-nuts@febo.com
> Subject: [time-nuts] thunderbolts not seeing 
> satellites
> 
> 
> 
> Hello everyone! Hope your new year is going well so 
> far.
> 
> I have two Tbolts (one from TAPR and one from another guy),
> and  neither one
> is locking on  satellites.
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[time-nuts] thunderbolts not seeing satellites

2010-01-03 Thread James R. Gorr

Hello everyone! Hope your new year is going well so far.

I have two Tbolts (one from TAPR and one from another guy), and neither one is 
locking on satellites.

My set up is a Lucent antenna, about 12 feet of LMR400, a Symmetricom 4 way 
Active "SmartSplitter",  then about 3 feet of LMR 195 to my non-TAPR Tbolt.  I 
have another GPS (non Tbolt) on the SmartSplitter also (that works fine, ie: is 
RX satellites).  This set up has worked for a couple years.  

I originally powered my non-TAPR Tbolt with three "wall warts".  When I got 
this GPS, I was told it took non-standard power of +12/+5/-7.

A while ago I noticed my Tbolt stopped working.  I took it offline and replaced 
it with one I bought from TAPR a year previous.  Additionally, I powered my 
"new" Tbolt with an HP 6236B, and everything worked fine.

Now, this morning I noticed my Tbolt is not working again!

It powers up, draws expected current on start up (then backs down after oven 
warms up) and I can monitor it with tboltmon.exe.  

I did a factory reset then manually input my position.

No critical alarms are showing (all green) and minor alarms are all green 
except for: Satellite Tracking, Oscillator Disciplining, and Almanac, which are 
yellow.

I have all 0.0 AMUs under Signal Levels.

I think because the other GPS (non-Tbolt) works, my antenna and splitter is 
fine.  

I have also tried switching ports on the splitter.

I have tested my jumper cable for shorts and continuity. 

Interestingly enough, if I power my original Tbolt (the +12/+5/-7 one) from the 
wall warts, it will "see" 2 satellites, but with very poor signal strength.  It 
will not see anything powered with +12/+5/-12 from the HP PS.

Both Tbolts have the same symptoms.

Anyone ever see issues like this?  Or have any suggestions?

Jamie





  

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Re: [time-nuts] delete

2009-03-07 Thread James R. Gorr

Reading and comprehension skills skills aside, Helmut is an ubber cool name!  
++ Helmut!

> To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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--- On Sat, 3/7/09, gandal...@aol.com  wrote:

> From: gandal...@aol.com 
> Subject: Re: [time-nuts] delete
> To: time-nuts@febo.com
> Date: Saturday, March 7, 2009, 8:33 AM
> In a message dated 07/03/2009 16:32:31 GMT Standard Time,  
> helmut.im...@t-online.de writes:
> 
> Please  delete me from the email distribution  list.
> Thanks!
> Helmut
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> 
> 
> ---
> Makes yer wonder don't it?
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[time-nuts] perl and GPS time

2009-01-11 Thread James R. Gorr

It is not Slashdot, but leapsecond.com got a mention on perlmonks.com:

http://perlmonks.com/?node_id=735502

Jamie


  

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Re: [time-nuts] TB PS/Antenna recommendations

2009-01-08 Thread James R. Gorr

Here is some information on different power-supplies for the tbolt and their 
performance:

http://www.leapsecond.com/pages/tbolt/noise.htm

My tbolt is a little different, it uses: +12/+5/-7 volts.

The only thing I had on hand was a box for of wall-warts, so I grabbed three 
out and configured them as such:

http://n3toy.net/images/power_supply.png

Not sure of the quality of power, but it works. 

Jamie




--- On Wed, 1/7/09, Richard Moore  wrote:

> From: Richard Moore 
> Subject: Re: [time-nuts] TBolt antenna
> To: time-nuts@febo.com
> Date: Wednesday, January 7, 2009, 8:54 PM
> On Jan 7, 2009, at 2:43 PM, time-nuts-requ...@febo.com
> wrote:
> >
> > Message: 6
> > Date: Wed, 7 Jan 2009 17:08:22 -0500
> > From: "Ronald Held"
> 
> > Subject: [time-nuts] TB PS/Antenna recommendations
> > To: time-nuts@febo.com
> > Message-ID:
> >
>   <9a86fb0e0901071408r4a205518mc346d7694f9af...@mail.gmail.com>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > I have not following all of discussions for a while,
> so perhaps I
> > missed out on some of this. What do people suggest for
> a power supply
> > and  from where? The harder request is for an indoor
> antenna probable
> > placed up against the window. Reliable dealers or
> stores would be very
> > helpful.
> >  Ronald
> >
> 
> I'm using a fairly crappy triple-output open-frame
> Autec supply from  
> Marlin P. Jones that was $13. I'm not recommending it,
> but it works.  
> My antenna is an active patch type by Hawk that runs off
> +5V from the  
> TBolt. It has a magnetic base for top of vehicle use.
> I've got it  
> feeding two GPSDOs thru a splitter and it's working
> great. I got it  
> from Synergy for $35 if I remember correctly -- been a
> while. I've  
> got it duct taped to a 2x4 sticking our from under the eave
> of my  
> lab. Most any active antenna will likely work OK outdoors,
> but I  
> don't know about indoors -- think you'll want some
> higher gain version.
> 
> Dick Moore
> 
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Re: [time-nuts] WWV / WWVH / WWVB

2009-01-07 Thread James R. Gorr

http://dkc3.digikey.com/PDF/T091/P0529.pdf


When I look at the catalogue, the description says: 

> | UTC Receiver Module, 60kHz, no CPU | 561-1014-ND | 10.70 | CMMR-6P-60 |

I have looked at modules like this before but what I saw was much more 
expensive.  So I'd like to get one at < $11.00.  Have you been able to RX WWVB 
with it (even if you haven't written anything to decode it)?

I wonder what the no CPU means?

Jamie


--- On Tue, 1/6/09, Scott Newell  wrote:

> From: Scott Newell 
> Subject: Re: [time-nuts] WWV / WWVH / WWVB
> To: "Discussion of precise time and frequency measurement" 
> 
> Date: Tuesday, January 6, 2009, 5:40 PM
> At 07:31 PM 1/6/2009, David M. Witten II wrote:
> >I was confused by their description too.  It does
> include the antenna.
> >I bought two to play with.  It seems pretty complete,
> but I haven't
> >written any code to read it yet.
> 
> Thanks--appreciate the confirmation!
> 
> -- 
> newell  N5TNL 
> 
> 
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Re: [time-nuts] altitude difference between two gps

2008-12-29 Thread James R. Gorr

It does appear to be a datum issue.  Although I never got the two GPS to match 
exactly, they are still a few meters apart.  I did find an older thread on the 
topic from March also.  Thanks for the replies!

Jamie

--- On Sat, 12/27/08, Ed, k1ggi  wrote:

> From: Ed, k1ggi 
> Subject: Re: [time-nuts] altitude difference between two gps
> To: "'Discussion of precise time and frequency measurement'" 
> 
> Date: Saturday, December 27, 2008, 11:12 PM
> On the thunderbolt, what datum do you have selected in Setup
> > Packet Masks
> and Options? If it is 0 (WGS-84), try 2 (NAD-27).
> -30m is about right for the geoid height around Las Vegas.
> Ed, k1ggi
> 
> -Original Message-
> From: James R. Gorr [mailto:n3...@yahoo.com] 
> Sent: Saturday, December 27, 2008 9:26 PM
> To: time-nuts@febo.com
> Subject: [time-nuts] altitude difference between two gps
> 
> Hello everyone!
> 
> I have a tbolt that I am monitoring with tboltmon.exe and
> some off-brand 12
> channel GPS (I bought from Sure Electronics on eBay) that I
> am monitoring
> with VisualGPS.  Both are fed from the same GPS antenna
> through a
> symmetricom splitter.  There is a 30 meter difference in
> the altitude
> readings between the two.  My tbolt says my altitude (after
> a self-survey)
> is ~761 meters and the 12 channel Sure Electronics GPS says
> my altitude is
> ~791 meters after 7,500+ readings.  I took my hand held
> Garmin 12XL outside
> and it says my altitude is ~790 meters at street level.
> 
> Anyone have an idea why my tbolt might be reading different
> from the other
> two devices?  I am assuming the tbolt is reading low. 
> 
> Jamie
> 
> 
>   
> 
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Re: [time-nuts] How are you going to spend your extra second?

2008-12-29 Thread James R. Gorr

As simple as it is, time.gov shows the leap second.  A screen capture from 
there is probably one of the easiest ways to "see" the leap second. 

Would be interested in seeing her leap second art.

Jamie


--- On Mon, 12/29/08, Magnus Danielson  wrote:


> I was just contacted by an artist that wants to capture the
> leap-second 
> for a project she does. I think it very well matches the
> topic of this 
> thread.
> 
> It brings on the discussion on how to best observe the
> leap-second.
> 
> For her part, getting the 23:59:60 reading would be the
> ideal. I came to 
> realize that few computer clocks would report that even
> with propper NTP.
> 
> So, ideas, knowledge, update since the last leap-second?
> 
> I would sure like to see it in various forms. I would like
> to have a 
> computer (UNIX/LINUX) clock that provides propper UTC...
> 
> I would not mind seeing it popping out of my GPS clocks
> either.
> 
> I don't think I will have DCF77, MSF or LORAN-C
> capability on new years 
> eve, otherwise those should be possible to receive here
> too.
> 
> Cheers,
> Magnus
> 
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Re: [time-nuts] altitude difference between two gps

2008-12-27 Thread James R. Gorr

Yes.  The pending leap second has me very scared.  It is the Y2k bug of 2008.  
:-)

Sorry, that is a tilde, not a negative sign.  Meant as "approximately" 791 
meters, although I may be using it completely wrong.  The real value (mean 
average) is 790.83 meters for the Sure Electronics GPS.

Sorry for the confusion.  

--- On Sat, 12/27/08, Richard W. Solomon  wrote:

From: Richard W. Solomon 
Subject: Re: [time-nuts] altitude difference between two gps
To: "Discussion of precise time and frequency measurement" 
Date: Saturday, December 27, 2008, 7:24 PM

-800 meters ??
Live in a mine ??
How can that be ?

73, Dick, W1KSZ

-Original Message-----
>From: "James R. Gorr" 
>Sent: Dec 27, 2008 9:26 PM
>To: time-nuts@febo.com
>Subject: [time-nuts] altitude difference between two gps
>
>Hello everyone!
>
>I have a tbolt that I am monitoring with tboltmon.exe and some off-brand 12 
>channel GPS (I bought from Sure Electronics on eBay) that I am monitoring with 
>VisualGPS.  Both are fed from the same GPS antenna through a symmetricom 
>splitter.  There is a 30 meter difference in the altitude readings between the 
>two.  My tbolt says my altitude (after a self-survey) is ~761 meters and the 
>12 channel Sure Electronics GPS says my altitude is ~791 meters after 7,500+ 
>readings.  I took my hand held Garmin 12XL outside and it says my altitude is 
>~790 meters at street level.
>
>Anyone have an idea why my tbolt might be reading different from the other two 
>devices?  I am assuming the tbolt is reading low. 
>
>Jamie
>
>
>      
>
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[time-nuts] altitude difference between two gps

2008-12-27 Thread James R. Gorr
Hello everyone!

I have a tbolt that I am monitoring with tboltmon.exe and some off-brand 12 
channel GPS (I bought from Sure Electronics on eBay) that I am monitoring with 
VisualGPS.  Both are fed from the same GPS antenna through a symmetricom 
splitter.  There is a 30 meter difference in the altitude readings between the 
two.  My tbolt says my altitude (after a self-survey) is ~761 meters and the 12 
channel Sure Electronics GPS says my altitude is ~791 meters after 7,500+ 
readings.  I took my hand held Garmin 12XL outside and it says my altitude is 
~790 meters at street level.

Anyone have an idea why my tbolt might be reading different from the other two 
devices?  I am assuming the tbolt is reading low. 

Jamie


  

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Re: [time-nuts] How are you going to spend your extra second?

2008-12-24 Thread James R. Gorr

Maybe I jumped the gun... (no pun intended).  My apologies, I must not have 
gone back far enough.

Ok, maybe the pun was intended.  :-)

--- On Wed, 12/24/08, Mark Sims  wrote:

From: Mark Sims 
Subject: [time-nuts] How are you going to spend your extra second?
To: time-nuts@febo.com
Date: Wednesday, December 24, 2008, 5:11 PM


James,
If you had read my previous post you would have realized I am far from an 
anti-gun political nut.  I have an arsenal that would make Sadaam blush (over 
100 pieces,  mostly military models from .17 cal to .50BMG).  I paid for the 
HP45 calculator that put me through engineering school by shooting rabbits for 
ranchers.  I was seventh in the nation in a Naval postal match.  What I am 
against is nutcases that spoil the fun for the rest of us by doing things like 
unloading a few magazines of ammo into the sky in the middle of a crowded city.
_
It’s the same Hotmail®. If by “same” you mean up to 70% faster.
http://windowslive.com/online/hotmail?ocid=TXT_TAGLM_WL_hotmail_acq_broad1_122008
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Re: [time-nuts] How are you going to spend your extra second?

2008-12-24 Thread James R. Gorr

Not sure what your post has to do with time.  But thanks for your anti-gun 
political commentary.  

I am going to spend my extra second making up for the time it took me to  
delete your post.

--- On Wed, 12/24/08, Mark Sims  wrote:

From: Mark Sims 
Subject: [time-nuts] How are you going to spend your extra second?
To: time-nuts@febo.com
Date: Wednesday, December 24, 2008, 1:22 PM


Unfortunately, in many US cities,  getting shot on New Years is an all too 
common occurance.  Knuckle dragging idiots celebrate with lots of booze, 
ammunition, and firearms.  At the stoke of midnight they unleash a hail of 
gunfire into the air...  and what goes up tends to come back down.  Inevitably 
somebody (more often than not, a child) will be in the exact place where 
something comes down.-In swedish leap-second translates to 
skott-sekund, and skott translates 
back to shot, so recalling the recent thread on fire-arms, don't get 
shot on the leap-second.
_
Send e-mail anywhere. No map, no compass.
http://windowslive.com/oneline/hotmail?ocid=TXT_TAGLM_WL_hotmail_acq_anywhere_122008
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Re: [time-nuts] spectracom line taps

2008-02-19 Thread James R. Gorr

OK, well it looks like the taps are needed for the
proper operation of this device.  I will just get a
TADD1.  Thanks for the input.  

--- Bill Janssen <[EMAIL PROTECTED]> wrote:

> John Ackermann N8UR wrote:
> > jshank said the following on 02/18/2008 03:05 PM:
> >   
> >> Jamie,
> >>
> >> If you have the Spectracom 8140 you need to use
> the line taps.  With out 
> >> using the line taps you sinewave will not be
> symmetrically along 0 voltage, 
> >> that is the sine wave will all be positive
> voltage.
> >> 
> >
> > I'm not certain about that; while I haven't used
> an 8140 amplifier, I
> > have an 8164 WWVB disciplined oscillator that has
> an option installed to
> > allow it to run a string of 8140T taps.  I was
> able to use those outputs
> > directly by using a series cap to isolate the DC
> voltage; what's left is
> > the 10 MHz sine wave.  As I noted in my other
> post, it does want to see
> > a 50 ohm load (after the isolating cap) or the
> fault indicator may go
> > on.  I suspect the 8140 amp is very similar;
> Spectracom did a lot of
> > design reuse across their products.
> >
> > John
> Be careful with that termination. If the  output has
> 12 volts DC you 
> would need an isolating cap.
> The Line Taps were intended for a production line
> where the taps could 
> just be plugged in
> and would get their power from the coax. Some were
> made that had a power 
> jack and those
> could be powered from a "wall transformer".
> 
> Bill K7NOM
> 
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[time-nuts] spectracom line taps

2008-02-18 Thread James R. Gorr

I have a Spectracom 8140 frequency distribution amp. 
I see on ebay there are line taps for this device.  Do
I need the line taps?  Or can I just use the 8140 as
is?  What are the line taps supposed to do?

Jamie


  

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Re: [time-nuts] Best choice for house 10MHz reference...??

2008-01-29 Thread James R. Gorr

Sorry for the noise!  --Jamie

--- "James R. Gorr" <[EMAIL PROTECTED]> wrote:

> 
> Hi George,
> 
> What are you asking for a Thunderbolt?
> 
> Jamie
> 
> --- George <[EMAIL PROTECTED]> wrote:
> 
> > John Miles wrote:
> > > As unhappy as you may be to hear it, Mike,
> you're
> > done upgrading, at least
> > > for now.  Thunderbolts are about as good as they
> > get.  Yes, some units like
> > > the HP and Jackson Labs clocks can do somewhat
> > better, and with
> > > entirely-different equipment, you might be able
> to
> > tell.  Not with the 49xP
> > > analyzer, though.
> > >
> > > Your 497P is limited by its 1-Hz counter LSD,
> not
> > the Thunderbolt.  1E-10
> > > accuracy from the Thunderbolt is 1 Hz at 10 GHz,
> > and that's about what the
> > > Thunderbolt does at tau=1s, even though the spec
> > sheet shows it closer to
> > > 1E-9 at t=1s.
> > >
> > > That means that there is no conceivable benefit
> to
> > further upgrading the 10
> > > MHz reference beyond where you already are.  I
> > know, I know, that's the
> > > worst news of all. :)
> > >
> > > Focus on giving the Thunderbolt the best signal
> > you can, via antenna
> > > mounting.
> > >
> > > -- john, KE5FX
> > >
> > >   
> > And, if anyone out there still need a Thunderbolt
> > (for less than the 
> > ebay price), I have a few more OEM units
> available.
> > 
> > 73,
> > 
> > geo - n4ua
> > 
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> >
>
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> > 
> 
> 
> 
>  
>

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Re: [time-nuts] Best choice for house 10MHz reference...??

2008-01-29 Thread James R. Gorr

Hi George,

What are you asking for a Thunderbolt?

Jamie

--- George <[EMAIL PROTECTED]> wrote:

> John Miles wrote:
> > As unhappy as you may be to hear it, Mike, you're
> done upgrading, at least
> > for now.  Thunderbolts are about as good as they
> get.  Yes, some units like
> > the HP and Jackson Labs clocks can do somewhat
> better, and with
> > entirely-different equipment, you might be able to
> tell.  Not with the 49xP
> > analyzer, though.
> >
> > Your 497P is limited by its 1-Hz counter LSD, not
> the Thunderbolt.  1E-10
> > accuracy from the Thunderbolt is 1 Hz at 10 GHz,
> and that's about what the
> > Thunderbolt does at tau=1s, even though the spec
> sheet shows it closer to
> > 1E-9 at t=1s.
> >
> > That means that there is no conceivable benefit to
> further upgrading the 10
> > MHz reference beyond where you already are.  I
> know, I know, that's the
> > worst news of all. :)
> >
> > Focus on giving the Thunderbolt the best signal
> you can, via antenna
> > mounting.
> >
> > -- john, KE5FX
> >
> >   
> And, if anyone out there still need a Thunderbolt
> (for less than the 
> ebay price), I have a few more OEM units available.
> 
> 73,
> 
> geo - n4ua
> 
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Re: [time-nuts] RFTG-m-RB

2008-01-19 Thread James R. Gorr

What I am trying to accomplish is provide a reference
for my HP 3586C.  I want to try my hand at the FMT in
February.

I have a set of the Lucent RFTG-m-XO and RFTG-m-RB.

My options are use the RB as stand alone or use the XO
with the GPS, or combine the two.  (I believe I have
the "matched set" that should work together).

Either way, they both output 15 MHz sine wave and the
RB outputs 10 MHz square wave.

Is there an advantage using one over the other?  I
would like to set them up together as the matched set
they are supposed to be, although I don't think there
is any advantage to that for me really.

So, for starters I was just going to use the Rb's 10
MHz output.  But the more I think about it, the more
questions I have.

>From reading all the previous posts about these the
GPS does not disciplines the Rb.  The Rb unit is there
to take over in the even the GPS fails.  So that leads
me to believe that the XO is more accurate in the
short term as long as it has something to steer it
like a GPS or the Rb.  

So my guess is that the XO would really be a better
choice, but I am back to dividing the 15 MHz down to
10 MHz.  I understand about dividing by 3 and
multiplying by 2.  Could someone please provide a
circuit?

Am I right in my logic and am I going down the right
path with my project?

Thanks for all the expert support.  

Jamie






--- John Ackermann N8UR <[EMAIL PROTECTED]> wrote:

> Bruce Griffiths said the following on 01/19/2008
> 05:20 PM:
> > James R. Gorr wrote:
> >> I always assumed frequency references should be
> sine
> >> waves.  If that is not the case, I guess I can
> use
> >> this for a reference for other equipment?  And if
> a
> >> square wave is just fine, could I use a
> clock-block to
> >> divide the 15 MHz of the XO down to 10 MHz?  
> > If you ever have to do this, the clock block is an
> unnecessarily complex
> > solution.
> 
> Actually, the Clock-Block is about the worst
> possible solution to this
> problem (since I designed it, I don't have to worry
> about offending
> anyone in saying that!).
> 
> The synthesizer used in the Clock-Block has very,
> very bad phase noise;
> that's the price of very wide frequency coverage in
> a single chip.
> 
> I haven't done it to my unit yet, but from tracing
> the circuitry of the
> RFTG, it doesn't look like it would be hard to
> bypass the 10 to 15 MHz
> conversion circuitry and feed 10 MHz from the
> oscillator directly to the
> primary output.  That would be a much better
> solution.
> 
> John
> 
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Re: [time-nuts] RFTG-m-RB

2008-01-19 Thread James R. Gorr

My scope was set for 2 volts / div, terminated right
in to the scope.  Arguably not the best way to view
it...

Here is another photo, terminated with 50 Ohms and
amplitude set at 1 volt per division.  I guess it
looks a lot cleaner.  Not sure what the impedance is
supposed to be.

I always assumed frequency references should be sine
waves.  If that is not the case, I guess I can use
this for a reference for other equipment?  And if a
square wave is just fine, could I use a clock-block to
divide the 15 MHz of the XO down to 10 MHz?  If not,
what other alternatives are there to get 10 MHz out
the the 15 MHz?  I have seen discussion on the
reflector about this, I will go back and search for
any circuits someone might have posted.

Sorry to unload so many questions!

Thanks! --Jamie


--- Rob Kimberley <[EMAIL PROTECTED]> wrote:

> James,
> 
> Not played with one of these units, but looks like a
> very useable 10 MHz
> square wave. What impedance are you terminating
> with? What is the amplitude
> scale on the 'scope?
> 
> Rob Kimberley 
> 
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of James R. Gorr
> Sent: 19 January 2008 19:15
> To: time-nuts@febo.com
> Subject: [time-nuts] RFTG-m-RB
> 
> 
> Attached is a photo of the output of my RFTG-m-RB J2
> (10 MHz REF OUT).  Is
> this the expected shape?  J4 (15 MHz OUT) is a nice
> clean sine wave.  Can I
> safely use this 10 MHz signal as a reference for
> other gear that takes a 10
> MHz input?
> 
> Thanks in advance!
> 
> Jamie
> 
> 
>  
>

> 
> Never miss a thing.  Make Yahoo your home page. 
> http://www.yahoo.com/r/hs
> 
> 
> 
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[time-nuts] RFTG-m-RB

2008-01-19 Thread James R. Gorr

Attached is a photo of the output of my RFTG-m-RB J2
(10 MHz REF OUT).  Is this the expected shape?  J4 (15
MHz OUT) is a nice clean sine wave.  Can I safely use
this 10 MHz signal as a reference for other gear that
takes a 10 MHz input?

Thanks in advance!

Jamie


  

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Re: [time-nuts] HP phase-noise measurement seminar coursebook

2007-09-22 Thread James R. Gorr
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY


Thanks for the scan!  As someone not in the industry
or having a background in metrology, a lot of stuff on
this list is *way* over my head, but I enjoy reading
the dialog.  And scans like this are a big help to me.

I have heard the term phase-noise used often here but
never really understood what it meant.  Hopefully this
scan will help.  Thanks again.

Jamie

--- John Miles <[EMAIL PROTECTED]> wrote:

> This seminar was given June 14, 1985 at Red Bank,
> NJ.  Its handout covered
> pretty much every bit of information and lore HP had
> to impart on
> phase-noise measurement.  Anyone interested in PN
> measurement with 80s-era
> hardware (8566/8568/3585A, 11729B/C, 3047A, etc.)
> may want to download a
> copy of the course notes that I just scanned.
> 
> http://www.ke5fx.com/HP_PN_seminar.pdf (124 pages, 7
> MB)
> 
> -- john, KE5FX
> 
> 
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[time-nuts] austron 2201A antenna

2007-09-19 Thread James R. Gorr
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY


Hello all,

I have an Austron 2201A GPS receiver, but no antenna. 
I know it does not take a standard antenna and I have
not been able to find an original on ebay since I got
the receiver. 

Anyone have any suggestions on where to locate one? Is
it possible to make or purchase a down-converter and
maintain the original specifications?  

I did not realize when I bought the unit it took
something special.  Anyone know why they decided to go
with something non-standard?  Maybe to lessen the loss
in the coax for an extended run?

Jamie


  

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[time-nuts] Bush Accepts Pentagon Position on GPS

2007-09-18 Thread James R. Gorr
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY


Not a technical link, just FYI:


WASHINGTON —  President Bush on Tuesday accepted the
Pentagon's decision to stop buying Global Positioning
System satellites that can intentionally degrade the
accuracy of civil signals used for a myriad of
purposes _ from tracking aircraft to finding missing
skiers.

http://www.foxnews.com/wires/2007Sep18/0,4670,BushGlobalPositioning,00.html


  

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Re: [time-nuts] OT: You know your getting old when...

2007-09-06 Thread James R. Gorr
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY


It does seem perfectly acceptable when working HF to
*say* "KCs" (I'll be listening around x MHz, plus or
minus 10 KCs).  Writing it does sort of date a person
though, which simply shows a level of experience.

> Re: [time-nuts] OT: You know your getting old
when...

Does OT mean "off topic" or "old timer"? :-)

--- Jack Hudler <[EMAIL PROTECTED]> wrote:

> When you find yourself writing 80 KC instead of 80
> KHz.
> 
> Jack
> 
> 


   
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Re: [time-nuts] great advice from the list

2007-08-14 Thread James R. Gorr
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY


It has been removed already.  I thought it was amazing
that 6 people bid on it the last time I saw it.

--- [EMAIL PROTECTED] wrote:

> Hi Jamie,
>  
> hopefully you flagged this as a fraudulent listing
> to Ebay, they usually  
> react quickly to these.
>  
> bye,
> Said
> 
> 
> 
> ** Get a sneak
> peek of the all-new AOL at 
> http://discover.aol.com/memed/aolcom30tour
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[time-nuts] great advice from the list

2007-08-13 Thread James R. Gorr
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY


Was looking around ebay this weekend and came across a
nice IFR-1900 service monitor.

 Item number: 160146014702

So many red flags popped up when I read the
description.  Starting bid was 300 and something, WAY
too cheap for such a clean unit...  The seller has a 0
(zero) feedback score...  Only been a registered user
since August 6th...  Seller only takes money order... 
Bad English for someone from Canada...

So, taking a hint from this group, I emailed the guy
and asked if it had the NTSC option installed.  Told
him to look in the rear for the NTSC input.  Here is
the reply I got back:

> Yes, it have the NTSC option installed. 
> It's a great IFR. Let me know, Pete

--Jamie


   

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Re: [time-nuts] manual request: Austron 2201A

2007-07-19 Thread James R. Gorr
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED]


Thanks, Rob!   

My unit has:
23411437-2 Time Code (IRIG-B)
23411900   Sine Output

I also have a 23412342 LORAN MODULE, not sure if it is
for this unit.

Thanks for checking.

Jamie

--- Rob Kimberley <[EMAIL PROTECTED]> wrote:

> Jamie,
> 
> I believe I have one in the "store". Will take a
> look tonight when I get
> back. May also be some of the module manuals. What
> plug-ins does it have?
> 
> Rob Kimberley 
> 
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of James R. Gorr
> Sent: 18 July 2007 23:30
> To: time-nuts@febo.com
> Subject: [time-nuts] manual request: Austron 2201A
> 
> ); SAEximRunCond expanded to false
> Errors-To:
>
[EMAIL PROTECTED]
> om
> 
> 
> Looking for a manual for an Austron 2201A GPS
> receiver.
> 
> Thanks!  --Jamie
> 
> 


   

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[time-nuts] manual request: Austron 2201A

2007-07-18 Thread James R. Gorr
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED]


Looking for a manual for an Austron 2201A GPS
receiver.

Thanks!  --Jamie

Fedora Core 4 Linux


   
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[time-nuts] Austron Model 2000C

2007-06-01 Thread James R. Gorr

I just picked up a Austron 2000C receiver.  I didn't
find much in the archives about this model and there
doesn't seem to be much information on the Internet
according to Google.  Does anyone have an e-copy of
the manual or can anyone point me in the right
direction to get me started with this unit?  I don't
even know enough about it to ask any questions. 
Thanks in advance. --Jamie

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Re: [time-nuts] SMB-F to SMA-F Cable

2007-04-25 Thread James R. Gorr

If no one stepped up yet, let me see what connectors I
have.  I know I got LMR-100 but not sure if I have the
connectors, but this will be the excuse I need to run
to the supply house and stock up...

Jamie

--- Jason Rabel <[EMAIL PROTECTED]> wrote:

> I figured I would make the request to you guys
> before I hit fleabay (they
> have some but I don't need a dozen - just one).
> 
> Does anyone have a short SMB-F to SMA-F cable I
> could buy? This is to
> connect to a Trimble ACE-III receiver. I have some
> extra receivers too if
> someone would rather do a swap.
> 
> Jason
> 
> 
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Re: [time-nuts] HP59309A HP-IB Digital Clock Operating and Service Manual

2007-04-23 Thread James R. Gorr

I would like a copy of the manual also.

Could it be put it on the wiki?

--- Norman J McSweyn <[EMAIL PROTECTED]> wrote:

> Martin,
> Stupid question. Is the front panel switch set to
> "ext"?
> I have a manual. I'd be willing to scan it if I
> somone would be willing to 
> host it.
> Norm 
> 
> 
> 
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Re: [time-nuts] Any you Nuts going to NAB?

2007-04-10 Thread James R. Gorr

I am, but I live here...

--- [EMAIL PROTECTED] wrote:

> Well who is in Vegas next week?
> 
> 
> 
> ** See what's
> free at http://www.aol.com.
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Re: [time-nuts] Hello

2007-03-20 Thread James R. Gorr

Here is a link to a photo of an HP 10811

http://www.slack.com/images/TE/HP10811A.jpg

Jamie


--- Neville Michie <[EMAIL PROTECTED]> wrote:

> 
> Hi I am new to this group, my background;
> electronics, amateur radio  
> and clocks.
> I am developing a free pendulum and to analyse its
> operation I  
> compare it to WWV
> on 5 or 10 MHz, the only available radio frequency
> standard on air in  
> Australia.
> To examine the phase drift and jitter I compare it
> with a 1MHz rock  
> in an oven.
> 
> I have a HP 5328A which is not stable. It is marked
> as having option 010
> but when I look inside there is only one crystal,
> 10mhz, which looks  
> like an el cheapo,
> and no sign of an oven.
> Can anyone tell me what option 010 looks like?
> I intend to buy a $20, better than average,  10mhz
> rock and put it in  
> an oven.
> Any advice would be appreciated,
> Neville Michie
> 
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Re: [time-nuts] HP-58532A antenna

2007-03-15 Thread James R. Gorr

I actually bought one of each of the antennas, just
haven't gotten to mount them outside yet.  I plan to
do some simple tests against each other but do not
have the expertise or equipment to run any in-depth
measurement.  

--- "Jose V. Gavila" <[EMAIL PROTECTED]> wrote:

> Hi Colin,
> 
> >I just purchased a GPS antenna on eBay that was
> listed as an HP-58532A. It does
> 
> >not have the look or dimensions of the 58532A. It
> is marked as a Lucent KS-
> >24019L112A. The case is marked with 26dB gain and
> comes with a type N 
> >connector. The seller is accelium. Does anyone know
> if this is in fact a 58532A
> 
> >or did someone other than HP/Symmetricom produced
> it?
> 
> I got one at eBay and got an HP-58832A manufactured
> by Symmetricom. Here you
> have the link, as item has a picture:
> 
>
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330076238344
> 
> If it is not that kind, I guess you have got another
> thing :-(!
> 
> Regards,
> 
> JOSE
> 
>
--
>  73 EB5AGV / EC5AAU - JOSE V. GAVILA
> La Canyada - Valencia (SPAIN) - Loc: IM99SM 
> 
>  Vintage Radio: http://jvgavila.com 
>  Vintage Test Equipment:
> http://jvgavila.com/testeq.htm 
> 
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Re: [time-nuts] Concern over Daylight Saving Time

2007-01-19 Thread James R. Gorr

I know there is an issue with Java, and I also noticed
a new Micro$oft patch (KB928388: 2007 Time Zone update
for Windows XP) that has to do with time, but I am not
sure if it has to do with Daylight Saving Time.

Jamie

--- Bob Kupiec <[EMAIL PROTECTED]> wrote:

> 
> March 11 at 02:00
> 
> The beginning of Daylight Saving Time in 2007.  Or
> the end of the world?
> 
> I work in an IT department and I'm finding that many
> of my colleagues
> aren't concerned about this at all.  There hasn't
> been much concern
> about correcting the issue by patching systems and
> applications.
> 
> Is this just my inner "time-nut" talking, who will
> be concerned that the
> clock will be off an hour on various devices?
> 
> Here is one URL I've found with some details on
> various problems,
> fixes, and workarounds: 
> http://www.reganfamily.ca/dst/
> 
> 
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Re: [time-nuts] Some Lucent RFTG-m-RB data

2007-01-09 Thread James R. Gorr

I have a '97 box and the disassembly is as you
described for the '96 box, except I only have 9 screws
on the bottom.

--- Bill Hawkins <[EMAIL PROTECTED]> wrote:

> Received two of the subject units, one built in 96
> and one in 97.
> The dates are the first two numbers in the serial
> number.
> 
> Took the 96 apart and learned that the LPRO-101 is
> not physically
> connected to the main board, except through a pin
> connector. When
> the unit is turned upside down, you can see a
> pattern of 6 screws
> in two rows of three. These secure the LPRO. The
> rest of the screws
> hold the main board. Do not turn the unit upside
> down but stand it
> on its rear fins as you remove the screws. This
> keeps the LPRO from
> dropping away and bending the pins.
> 
> The LPRO has a thermal plate that provides good
> conductivity to the
> case, so it can dissipate about 15 watts. There is
> no thermal goo
> between the plate and the box, but the plate may be
> stuck to the box.
> Put a screw in a hole and push on it to release the
> LPRO. Then, if
> you have removed the 10 screws that hold the panel
> to the box, it
> should all lift out easily, with the LPRO hanging by
> its connector.
> I'd recommend laying the box down in its normal
> position and sliding
> the innards out horizontally.
> 
> Imagine my surprise when what I'd learned didn't
> work on the 97 box.
> That assembly has a clamp that holds the LPRO in
> place, so pushing on
> a screw doesn't work. There are four screws on the
> back, between the
> fins. Loosen them to loosen the clamp, but don't
> remove them.
> 
> Reassembled both - you don't want to run the LPRO
> without a heat sink.
> The 97 unit drew 1.4 amps at 24 VDC at startup. The
> NO GPS and Fault
> lights were lit. The current dropped to .7 amp but
> the Fault light was
> still lit. Got 10 MHz at the J1 test point but
> nothing at the 10 MHz
> output. Went away for an hour, came back to find the
> ON light, got 10
> MHz at J2, didn't check 15 MHz. The 96 unit had the
> same behavior, but
> the 10 MHz was more accurate. The box got quite
> warm, but you could
> keep your hand on it. (How's that for quantitative?)
> 
> I have two Z3801s and two Racal-Dana model 1992
> counters set to Phase
> A-B.
> One counter has been measuring a 4040 cesium box
> against one of the GPS
> receivers. The other counter measures the phase
> difference between the
> Z3801s. With the 96 unit in place of the 4040, phase
> rotation was 220
> degrees in 20 minutes. The GPS comparison doesn't
> rotate, but varies
> between 50 and 70 degrees. I consider that an
> indication that the
> receivers
> are OK. The holdover accuracy varies between 0.5 and
> 5 microseconds,
> depending on when the crystal last cracked.
> 
> If I did the math right, a 360 rotation will take
> 2000 seconds. This
> means
> the LPRO is about 5x10E-11 off from GPS, no?
> 
> Two other questions:
> 
> What is the BITE pin on the LPRO? Some Built-In
> Test?
> 
> What is the protocol for the data at J6? Can it be
> the same as the
> Z3801?
> 
> Bill Hawkins
> 
> 
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Re: [time-nuts] LUCENT RFTG-m-RB

2006-12-25 Thread James R. Gorr


> I'm hopeful that either the RB can lock onto a PPS 
> via the DB9, or a 10 MHz input.

If you can put a 1PPS from a GPS in it to discipline
it, that would be cool.  But what do you have that
outputs 10 MHZ that would be better than the Rb to
discipline the Rb?  

Maybe I got this all wrong, but I thought the idea was
you would put in a 1PPS to the Rb and get a really
clean 10 MHz out?

Jamie

--- Jason Rabel <[EMAIL PROTECTED]> wrote:

> >
> > Here are two GPS disciplined standards, not sure
> if they are Rb.
> >
> 
> Those are the XO units, but they do have the GPS in
> them, as you can see the
> antenna connector (looks like a TNC). 
> 
> The other person selling all the RBs is also selling
> the RFTG-M-XO (same as
> you linked to) only about 5 popped up recently and I
> think only 1 is
> currently left, for like $180 BIN.
> 
> I was thinking about getting one of the XO's, but
> I'm going to hold out
> until I get my RB and see what can be done with it
> by itself. I'm hopeful
> that either the RB can lock onto a PPS via the DB9,
> or a 10 MHz input. Worst
> case it could be removed from the lucent module and
> used by itself.
> 
> Also to reply to someone else in this thread - I've
> signed up on the Lucent
> website but waiting for verification (manual
> process) before I can do
> anything. If I get any documentation I will be sure
> to let you guys know.
> 
> Jason
> 
> 
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Re: [time-nuts] LUCENT RFTG-m-RB

2006-12-24 Thread James R. Gorr

There seems to be very little documentation floating
around for these units.  I bought one of the $130/$185
units (LUCENT RFTG-m-RB) and hope when others start
getting theirs and figuring them out they will post
their findings.  

I did email the guy I bought mine from and asked if he
had any documentation, but I heard nothing back.  If I
do find something I will post it, of course.

Jamie

--- "David I. Emery" <[EMAIL PROTECTED]> wrote:

> On Sun, Dec 24, 2006 at 08:40:58PM -0600, Jack
> Hudler wrote:
> > Unit says RFTG-m-XO   XO = xtal and RB = rubidium
> 
>   Probably, but not certainly, the units advertised
> can pair with
> one of the Rb RFTG-M-RB units recently discussed to
> provide a
> disciplined rubidium with OCXO backup.   Apparently
> most of what is
> required is db-9 to db-9 cables and a couple of SMA
> to SMA connections.
> 
>   It appears from some net published photos of the
> interior of a
> similar but possibly later unit (L109) that it is
> possible that either a
> Rb or OCXO could be configured to be GPS disciplined
> as a single unit
> rather than a pair.  It looks like this mostly
> involves adding a GPS
> disciplining mezzanine board and the Moto GPS
> receiver card.
> 
>   I should say it appears the hardware can be
> configured like
> this, not so clear as to whether the firmware
> supports such.
> 
>   I have ordered a couple of the RFTG-m-XO units to
> pair with the
> RFTG-m-Rb I ordered thinking they included the GPS,
> and when I finally
> get delivery of them I will try to put up a web page
> with hi res photos
> of the inside.
> 
>   I am, of course, - as at least a couple of others
> here - quite
> interested in documentation  
> 
>   I am also very much interested in the mechanism
> used to synthesize
> the 15 MHz output.   The L109 photos look like
> perhaps a DDS chip is
> being used for this, and if so I have a strong
> interest in hacking the
> box to produce a precision 64 MHz clock for a
> gnuradio USRP board...
> obviously even the capability to go to 16 MHz
> instead of 15 would be 
> very nice...
> 
> -- 
>Dave Emery N1PRE,  [EMAIL PROTECTED]  DIE
> Consulting, Weston, Mass 02493
> "An empty zombie mind with a forlorn barely readable
> weatherbeaten
> 'For Rent' sign still vainly flapping outside on the
> weed encrusted pole - in 
> celebration of what could have been, but wasn't and
> is not to be now either."
> 
> 
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Re: [time-nuts] LUCENT RFTG-m-RB

2006-12-24 Thread James R. Gorr

Here are two GPS disciplined standards, not sure if
they are Rb.

http://cgi.ebay.com/GPS-FREQUENCY-STANDARD-RFTG-LUCENT_W0QQitemZ290065147621QQihZ019QQcategoryZ25399QQrdZ1QQcmdZViewItem

http://cgi.ebay.com/GPS-FREQUENCY-STANDARD-RFTG-LUCENT_W0QQitemZ290065149913QQihZ019QQcategoryZ25399QQrdZ1QQcmdZViewItem

Jamie


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Re: [time-nuts] motorola oncore descriptions

2006-12-13 Thread James R. Gorr

Wow, thanks!  You answered all my questions, and very
quickly.  -- Jamie

--- Jason Rabel <[EMAIL PROTECTED]> wrote:

> Hi Jamie,
> 
> The VP is the top of the line model. I bought one of
> the VP models from
> midnight_seller on eBay, it is running the latest
> firmware (10), has an
> onboard battery, right angle MCX, and has all the
> features enabled (IBC),
> position hold, 1PPS and all that jazz. I asked Randy
> @ Synergy what that
> code meant and he said the following:
> 
> The options go like this:
>   I: TRAIM
>   B: Basic "plain vanilla receiver"
>   C: Carrier phase
> 
> The UT+ is the timing model, it uses a subset of the
> VP commands. It also
> only works in the Motorola Binary format, it can not
> switch to NMEA mode. It
> also has TRAIM and position hold. Besides the 1PPS
> output, it can also do a
> 100PPS output. I bought a couple of these from
> sales3600 on eBay, they do
> NOT have a battery, have a straight MCX connector,
> and they were running
> firmware 3.1, which the latest is 3.2, I again asked
> Randy @ Synergy what
> the difference was and he said 3.2 had a fix for
> 100PPS. He would update a
> receiver for $25 each, but since I'm not using
> 100PPS I have no real reason
> to upgrade it since it works fine as-is.
> 
> The GT models are more for navigation, not timing.
> They do not have position
> hold or TRAIM. They do have 1PPS but it is not as
> accurate as the VP or UT+
> models.
> 
> For the prices on eBay I would get the VP receiver,
> unless you specifically
> want/need the 100PPS, which you would still have to
> update the firmware.
> 
> Once you start considering costs for everything else
> you will need, i.e.
> adapter for power & RS232 signals, antenna, etc...
> You could just also spend
> a little more and get a M12M Timing (newer model)
> Starter Kit from Synergy
> Systems.
> 
> Now, about the Rockwell Jupiter 8 boards...
> 
> The TU30D140 is 5V powered (Antenna can be passive,
> 5V or 12V)
> The TU30D160 is 3.3V powered (Antenna can be
> passive, 5V or 12V)
> 
> Both boards have 10 KHz output. That's about it...
> 
> Any of the above units will work with NTP, in their
> native binary modes. I
> know with the Jupiter 8 if you switch it to nmea
> mode then the time will be
> 1-2 seconds behind always in the nmea sentences.
> I've experienced the same
> issue with an old sirf receiver, and a superstar II.
> I haven't tried my
> motorola in nmea mode so I don't know what it would
> do. As far as support
> goes, the motorola has the most options in NTP.
> 
> I'm listing a couple jupiter boards on eBay, and I
> would be willing to sell
> them direct for less than what I'm listing them.
> 
> If you dig around in the time-nuts archives, you can
> a discussion on these
> boards within the past couple months I believe.
> 
> I have loads of PDFs for all the above Motorola &
> Rockwell stuff. Too much
> to email but I can throw it online and you can
> download whatever you need or
> want.
> 
> If you want a frequency reference, someone has been
> selling Brandywine GPS-4
> units on eBay for $355, I don't know how many he has
> left or when the next
> batch will be listed. You can go to their website
> for more info, but it's a
> GPS unit with an OCXO and everything.
> 
> Jason
> 
> > Hello all
> > 
> > I am looking for information on the different
> > Motorola Oncore GPS's.  Would like to know what
> the
> > difference is between the UT+ and VP, and the
> > differences between the different model numbers. 
> > Advantages of one over the other?  Stuff like
> that. 
> > The links from TAPRs page to Motorola is no longer
> > valid.  Can anyone point me to a good source of
> basic
> > information like that?  Maybe someone had an
> e-version
> > of the specs for these?  Looking at different ones
> on
> > ebay and not sure which one to get for building a
> > frequency reference like the one by Brooks Shera. 
> 
> > 
> > Also, I found some Rockwell Jupiter's, models
> TU30D140
> > and TU30D160.  What is the difference between
> them?  I
> > believe the TU30D140 has the 10KHz output.  Is
> that
> > true?
> > 
> > Thanks in advance! --Jamie
> 
> 
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Re: [time-nuts] motorola oncore descriptions

2006-12-13 Thread James R. Gorr

Hello all

I am looking for information on the different
Motorola Oncore GPS's.  Would like to know what the
difference is between the UT+ and VP, and the
differences between the different model numbers. 
Advantages of one over the other?  Stuff like that. 
The links from TAPRs page to Motorola is no longer
valid.  Can anyone point me to a good source of basic
information like that?  Maybe someone had an e-version
of the specs for these?  Looking at different ones on
ebay and not sure which one to get for building a
frequency reference like the one by Brooks Shera.  

Also, I found some Rockwell Jupiter's, models TU30D140
and TU30D160.  What is the difference between them?  I
believe the TU30D140 has the 10KHz output.  Is that
true?

Thanks in advance! --Jamie


 

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