Re: [time-nuts] ngTADD-1

2013-04-24 Thread Kevin Rosenberg
On Apr 23, 2013, at 4:16 PM, Bob Camp li...@rtty.us wrote:
 There are optical links that are better than your typical opto coupler. I 
 have not seen many that are good to -170 dbc. 

Rather than for a 10 MHz signal, I might prefer an optical link rather than 
differential for a PPS signal. Could you recommend any optical links with 
jitter of about 1 ns?

Kevin

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Re: [time-nuts] S743 Marketplace Fariness Act

2013-04-24 Thread Chris Albertson
On Tue, Apr 23, 2013 at 3:51 PM, Tom Knox act...@hotmail.com wrote:

 The eBay emails appear real since it can also be accessed on my actual
 eBay site. I cannot imagine what a pain it would be to sell 20 items on
 eBay each to a buyer in a different state and be required to file the
 paperwork to pay taxes on each of those sales. This is a formula for
 disaster.


 You as a selling would NOT have to worry Pay Pal could hand the taxes for
you.  Sellers would not have to do much.

Chris Albertson
Redondo Beach, California
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Re: [time-nuts] S743 Marketplace Fariness Act... and freq standard box

2013-04-24 Thread Peter Gottlieb
What I read is that it is for merchants who exceed a million dollars a year.  
So, if it is determined it is each seller that is responsible, it would only 
apply to those doing greater than a million in sales (not many).  If however it 
is determined that it is ebay who is the merchant, then they would have to 
handle the tax collection and payment and it would simply be added to the final 
auction and maybe plus shipping amount (depending on the state and what is 
taxable).  This is the most likely scenario.  It is more complex than just what 
tax rate to use as each state taxes different things.  For example, some states 
do not tax clothing, others do, and some others only if the item exceeds some 
cost.  As I mentioned in another message there are third party services which 
keep track of all this already.  For a site like ebay it is complex but not 
daunting task to set that up.


I will spend my time worrying about how I am building my combo Rb and 
Thunderbolt box.  I have a TADD-1 amp in there, pulse stretchers to drive front 
panel 1 PPS live indicators, a serial to IP adapter to give the box network 
connectivity (mainly for the Thunderbolt but switchable to the FE-5680A).  I 
have a fan setup in an isolated section (it is built into a 2U rack box) for the 
TB so LH can help with temperature, but I'm not sure if I should use a computer 
to discipline the Rb or just set it close manually every so often.  And which 
should I feed into the TADD dist amp?  The Rb?  Initially I'm just putting  a 
switch in so I can select.  I'd love to hear comments on this.  I can post 
photos of where I am at in the construction if anyone is interested.


Peter

On 4/23/2013 6:51 PM, Tom Knox wrote:

The eBay emails appear real since it can also be accessed on my actual eBay 
site. I cannot imagine what a pain it would be to sell 20 items on eBay each to 
a buyer in a different state and be required to file the paperwork to pay taxes 
on each of those sales. This is a formula for disaster.

Thomas Knox




To: time-nuts@febo.com
From: johncr...@aol.com
Date: Tue, 23 Apr 2013 16:04:58 -0400
Subject: Re: [time-nuts] S743 Marketplace Fariness Act

The ebay message re this law is probably legit. In any case
the congress IS considering such a law. In essence it forces
all internet sellers to collect the sales tax due in the buyers state. If you live in a 
state with a law requiring that sales tax be paid on all out of state purchases (internet 
or not), often called a use tax, as the buyer you are required to pay this 
tax. The taxes already are on the books, they are often not enforced.

You can learn all about this with a Google search which will reveal all sorts 
of opinions. Here is one that is not too
bad:

http://www.forbes.com/sites/beltway/2013/04/23/five-things-you-should-know-about-the-long-overdue-online-sales-tax-bill/

If you already comply with the law and do a lot of internet purchases; passage 
will relieve you of a pain in the ass accounting job at tax time. If your state 
has no such tax or if you avoid paying it, though your state requires it, 
passage will cost you some sale taxes you would have otherwise escaped.

One nasty consequence is that the software to pull this off is non-trivial 
since local sales taxes in many states vary by county, school district, local 
bond issues and so on. How that is handled should be amusing.

-73 john k6iql


  



  
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-
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1432 / Virus Database: 3162/5768 - Release Date: 04/23/13




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Re: [time-nuts] S743 Marketplace Fariness Act

2013-04-24 Thread DaveH
And the funny thing is that there is already legislation in place to deal
with this.

If an online vendor has a corporate office, a warehouse or a brick and
mortar retail store in State XX (that has a sales tax), AND if an online
customer places an order to be shipped to an address in State XX, the sales
tax for State XX has to be charged.

I live in WA State and buy online from Amazon (corporate headquarters as
well as warehouse) and I get charged the WA State sales tax.  I buy online
from Fry's (just a brick and mortar store) and get charged sales tax. Parts
Express (great company) - no presence in WA State so no sales tax.

If I walked into Parts Express's corporate headquarters in Ohio and
purchased some stuff, I could show my WA State drivers license and be exempt
from the Ohio sales tax. Why is this any different from an online purchase?

Starve the beast -- it is doing nothing good for us.

 -Original Message-
 From: time-nuts-boun...@febo.com 
 [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson
 Sent: Tuesday, April 23, 2013 21:38
 To: Discussion of precise time and frequency measurement
 Subject: Re: [time-nuts] S743 Marketplace Fariness Act
 
 On Tue, Apr 23, 2013 at 3:51 PM, Tom Knox act...@hotmail.com wrote:
 
  The eBay emails appear real since it can also be accessed 
 on my actual
  eBay site. I cannot imagine what a pain it would be to sell 
 20 items on
  eBay each to a buyer in a different state and be required 
 to file the
  paperwork to pay taxes on each of those sales. This is a formula for
  disaster.
 
 
  You as a selling would NOT have to worry Pay Pal could hand 
 the taxes for
 you.  Sellers would not have to do much.
 
 Chris Albertson
 Redondo Beach, California
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Re: [time-nuts] Z38XX

2013-04-24 Thread Volker Esper


How do I recognize a wear out? Does the receiver send an error message 
every time I try to change the NVRAM or do I have to ask it?

Volker

Am 24.04.2013 00:08, schrieb Mark C. Stephens:

Thanks Ulrich, Much Appreciated, prefer to use your software.

Thanks Again,
mark

-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf 
Of Ulrich Bangert
Sent: Tuesday, 23 April 2013 5:36 PM
To: Time nuts
Subject: [time-nuts] Z38XX

Gentlemen,

due to the discussion that evolved concerning Z38XX i looked up the sources and 
found that indeed every time the current time is read using a

:PTIM:TCOD?

a

:PTIM:TCOD:FORM F2

is sent in advance to make the receiver answer in the format that Z38XX needs. 
I have not been aware that this could lead to NVRAM wear out but have been 
thinking this simply sets the format of the next output. I have changed the 
software so that the FORM F2 command is now only written once after program 
start. The software can be downloaded from the usual place but I have currently 
no time to test it.

My own experiences with NV memory that can only be written for a limited number 
of times  (EEPROM on ATMEL processors) indicates that a clever made NV writing 
routine would first compare the NV contents to what shall be written on a byte 
by byte base and write only changed bytes.

Best regards

Ulrich Bangert
www.ulrich-bangert.de
Ortholzer Weg 1
27243 Gross Ippener

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Re: [time-nuts] ngTADD-1

2013-04-24 Thread Attila Kinali
On Tue, 23 Apr 2013 22:08:28 -0600
Kevin Rosenberg ke...@rosenberg.net wrote:

 On Apr 23, 2013, at 4:16 PM, Bob Camp li...@rtty.us wrote:
  There are optical links that are better than your typical opto coupler. I 
  have not seen many that are good to -170 dbc. 
 
 Rather than for a 10 MHz signal, I might prefer an optical link rather than
 differential for a PPS signal. Could you recommend any optical links with
 jitter of about 1 ns?


There should be quite a few fiber optics transceivers and receivers for
780nm and 850nm used for data communications (Fiber GBit for inhouse cabling).
The photodiodes should be all PIN diodes in that area, so fast and hence
low jitter (sub 1ns rise/fall times). For the transmitters, if possible
go for those with laser diodes and modulate them (ie no on-off switching).
This will give you jitter way below 1ns (sorry, don't know any hard numbers).

The usual suspects should carry transmitters and receivers that can
couple directly into fibers.

As for the fiber. If possible (and you can afford it) use single mode
fibers. For short stuff multimode should do as well.

Attila Kinali


-- 
The trouble with you, Shev, is you don't say anything until you've saved
up a whole truckload of damned heavy brick arguments and then you dump
them all out and never look at the bleeding body mangled beneath the heap
-- Tirin, The Dispossessed, U. Le Guin
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Re: [time-nuts] ngTADD-1

2013-04-24 Thread Bob Camp
Hi

The stuff I've seen is aimed at the military market. It's in the don't even 
ask about the price category for home applications. It's also new enough that 
I doubt it's on the surplus market yet. I'd haunt the auction sites for a 
complete set of parts. You'll need both ends (tx and rx) *and* a proper cable 
with connectors. Yes, you can put the connectors on yourself, but it'll take a 
bit of practice to get it right. 

Bob

On Apr 24, 2013, at 12:08 AM, Kevin Rosenberg ke...@rosenberg.net wrote:

 On Apr 23, 2013, at 4:16 PM, Bob Camp li...@rtty.us wrote:
 There are optical links that are better than your typical opto coupler. I 
 have not seen many that are good to -170 dbc. 
 
 Rather than for a 10 MHz signal, I might prefer an optical link rather than 
 differential for a PPS signal. Could you recommend any optical links with 
 jitter of about 1 ns?
 
 Kevin
 
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Re: [time-nuts] Z38XX

2013-04-24 Thread Bob Camp
Hi

At least on the 53131, the first sign of wear out was an error message. I 
believe it was a self test message (checksum error). I could easily be wrong 
about that. We blew them out within 9 months of when they were first 
introduced. That was a long time ago.

Bob

On Apr 24, 2013, at 3:43 AM, Volker Esper ail...@t-online.de wrote:

 
 How do I recognize a wear out? Does the receiver send an error message every 
 time I try to change the NVRAM or do I have to ask it?
 Volker
 
 Am 24.04.2013 00:08, schrieb Mark C. Stephens:
 Thanks Ulrich, Much Appreciated, prefer to use your software.
 
 Thanks Again,
 mark
 
 -Original Message-
 From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On 
 Behalf Of Ulrich Bangert
 Sent: Tuesday, 23 April 2013 5:36 PM
 To: Time nuts
 Subject: [time-nuts] Z38XX
 
 Gentlemen,
 
 due to the discussion that evolved concerning Z38XX i looked up the sources 
 and found that indeed every time the current time is read using a
 
 :PTIM:TCOD?
 
 a
 
 :PTIM:TCOD:FORM F2
 
 is sent in advance to make the receiver answer in the format that Z38XX 
 needs. I have not been aware that this could lead to NVRAM wear out but have 
 been thinking this simply sets the format of the next output. I have changed 
 the software so that the FORM F2 command is now only written once after 
 program start. The software can be downloaded from the usual place but I 
 have currently no time to test it.
 
 My own experiences with NV memory that can only be written for a limited 
 number of times  (EEPROM on ATMEL processors) indicates that a clever made 
 NV writing routine would first compare the NV contents to what shall be 
 written on a byte by byte base and write only changed bytes.
 
 Best regards
 
 Ulrich Bangert
 www.ulrich-bangert.de
 Ortholzer Weg 1
 27243 Gross Ippener
 
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Re: [time-nuts] Radio with GPSDO

2013-04-24 Thread Jim Lux

On 4/23/13 6:54 PM, li...@lazygranch.com wrote:

http://www.aorusa.com/receivers/ar2300.html

Just a FYI.



Interesting..

I see they use the OEM GPS from Garmin.  I wonder what kind of DO 
performance they get, and whether they actually discipline the 
oscillator or just measure it.  Since they've got a DDS, they could use 
a quiet fixed OCXO, undisciplined, and just adjust the DDS control word.



Fascinating, also, that they provide a raw I/Q sample output.  Clearly, 
that's the way of the future, and it makes sense.


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Re: [time-nuts] S743 Marketplace Fariness Act... and freq standard box

2013-04-24 Thread J. Forster
Peter,

I believe you are correct about the $1M per year trip point, but would
remind you that this is a very slippery slope.

When the Income Tax was originally enacted, very, very few were impacted.
That is no longer so.

The Alternative Minimum Tax was enacted to hit those who have saved and
invested already taxed once money, and hit them again. Yet over the years
the AMT has hit more and more in the middle class, so Congress has had to
enact annual 'fixes'.

The Capital Gains tax is on assets that have increased in value, but there
is no provision to index the CG taxes for inflation. So, the fed inflated
the currency, and taxes virtual growth.

This is fundamentally not about 'fairness'. It is all about government at
all levels wanting more and more money, ultimately to buy votes, by
playing Santa Claus with other peoples' money.

The 'fairness' argument is all about the politics of envy and getting
re-elected.

YMMV,

-John

==





 What I read is that it is for merchants who exceed a million dollars a
 year.
 So, if it is determined it is each seller that is responsible, it would
 only
 apply to those doing greater than a million in sales (not many).  If
 however it
 is determined that it is ebay who is the merchant, then they would have
 to
 handle the tax collection and payment and it would simply be added to the
 final
 auction and maybe plus shipping amount (depending on the state and what is
 taxable).  This is the most likely scenario.  It is more complex than just
 what
 tax rate to use as each state taxes different things.  For example, some
 states
 do not tax clothing, others do, and some others only if the item exceeds
 some
 cost.  As I mentioned in another message there are third party services
 which
 keep track of all this already.  For a site like ebay it is complex but
 not
 daunting task to set that up.
[snip]

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Re: [time-nuts] Z38XX

2013-04-24 Thread Azelio Boriani
I have a weared out 24LC256: I have made some experiments and noted that
the bits turned to 1, slowly revert back to 0. Writing and immediately
reading back to check can show no errors but reading again after some
seconds reveals the errors.


On Wed, Apr 24, 2013 at 9:43 AM, Volker Esper ail...@t-online.de wrote:


 How do I recognize a wear out? Does the receiver send an error message
 every time I try to change the NVRAM or do I have to ask it?
 Volker

 Am 24.04.2013 00:08, schrieb Mark C. Stephens:

 Thanks Ulrich, Much Appreciated, prefer to use your software.

 Thanks Again,
 mark

 -Original Message-
 From: time-nuts-boun...@febo.com 
 [mailto:time-nuts-bounces@**febo.comtime-nuts-boun...@febo.com]
 On Behalf Of Ulrich Bangert
 Sent: Tuesday, 23 April 2013 5:36 PM
 To: Time nuts
 Subject: [time-nuts] Z38XX

 Gentlemen,

 due to the discussion that evolved concerning Z38XX i looked up the
 sources and found that indeed every time the current time is read using a

 :PTIM:TCOD?

 a

 :PTIM:TCOD:FORM F2

 is sent in advance to make the receiver answer in the format that Z38XX
 needs. I have not been aware that this could lead to NVRAM wear out but
 have been thinking this simply sets the format of the next output. I have
 changed the software so that the FORM F2 command is now only written once
 after program start. The software can be downloaded from the usual place
 but I have currently no time to test it.

 My own experiences with NV memory that can only be written for a limited
 number of times  (EEPROM on ATMEL processors) indicates that a clever made
 NV writing routine would first compare the NV contents to what shall be
 written on a byte by byte base and write only changed bytes.

 Best regards

 Ulrich Bangert
 www.ulrich-bangert.de
 Ortholzer Weg 1
 27243 Gross Ippener

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Re: [time-nuts] Z38XX

2013-04-24 Thread Volker Esper


thanks

Am 24.04.2013 13:22, schrieb Bob Camp:

Hi

At least on the 53131, the first sign of wear out was an error message. I 
believe it was a self test message (checksum error). I could easily be wrong 
about that. We blew them out within 9 months of when they were first 
introduced. That was a long time ago.

Bob

On Apr 24, 2013, at 3:43 AM, Volker Esperail...@t-online.de  wrote:

   

How do I recognize a wear out? Does the receiver send an error message every 
time I try to change the NVRAM or do I have to ask it?
Volker

Am 24.04.2013 00:08, schrieb Mark C. Stephens:
 

Thanks Ulrich, Much Appreciated, prefer to use your software.

Thanks Again,
mark

-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf 
Of Ulrich Bangert
Sent: Tuesday, 23 April 2013 5:36 PM
To: Time nuts
Subject: [time-nuts] Z38XX

Gentlemen,

due to the discussion that evolved concerning Z38XX i looked up the sources and 
found that indeed every time the current time is read using a

:PTIM:TCOD?

a

:PTIM:TCOD:FORM F2

is sent in advance to make the receiver answer in the format that Z38XX needs. 
I have not been aware that this could lead to NVRAM wear out but have been 
thinking this simply sets the format of the next output. I have changed the 
software so that the FORM F2 command is now only written once after program 
start. The software can be downloaded from the usual place but I have currently 
no time to test it.

My own experiences with NV memory that can only be written for a limited number 
of times  (EEPROM on ATMEL processors) indicates that a clever made NV writing 
routine would first compare the NV contents to what shall be written on a byte 
by byte base and write only changed bytes.

Best regards

Ulrich Bangert
www.ulrich-bangert.de
Ortholzer Weg 1
27243 Gross Ippener

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Re: [time-nuts] Radio with GPSDO

2013-04-24 Thread lists
In a world of digital comms with very capable competition, AOR has been looking 
for a reason to exist. They have turned to high end gear. For some time now, 
their radios were DDS and capable of running from an external 10MHz. I suspect 
they are used in a rack of gear to direction find. The black box SDR version is 
the next obvious step since nobody was actually playing with the knobs anyway.

I would be surprised if there were vans with 3 or 4 of these black box radios 
as part of a stingray or silent ping set up using correlation techniques to 
RDF cellular users. It has enough bandwidth to cover all known cellular 
providers. It could probably RDF wifi.




-Original Message-
From: Jim Lux jim...@earthlink.net
Sender: time-nuts-boun...@febo.com
Date: Wed, 24 Apr 2013 04:33:26 
To: time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Radio with GPSDO

On 4/23/13 6:54 PM, li...@lazygranch.com wrote:
 http://www.aorusa.com/receivers/ar2300.html

 Just a FYI.


Interesting..

I see they use the OEM GPS from Garmin.  I wonder what kind of DO 
performance they get, and whether they actually discipline the 
oscillator or just measure it.  Since they've got a DDS, they could use 
a quiet fixed OCXO, undisciplined, and just adjust the DDS control word.


Fascinating, also, that they provide a raw I/Q sample output.  Clearly, 
that's the way of the future, and it makes sense.

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Re: [time-nuts] S743 Marketplace Fariness Act

2013-04-24 Thread Robert Darlington
On Wed, Apr 24, 2013 at 1:04 AM, DaveH i...@blackmountainforge.com wrote:

 If I walked into Parts Express's corporate headquarters in Ohio and
 purchased some stuff, I could show my WA State drivers license and be
 exempt
 from the Ohio sales tax. Why is this any different from an online purchase?


Actually, that's not true at all.  Ordering across state lines and picking
up will trigger them having to pay sales tax (and then charging you) since
the sale happened in Ohio as well as if you just cross into Ohio and
initiate the transaction there.

And again, this thread has no business being on this list so please make it
go away guys.  The only reason I'm saying anything is to encourage people
to just stop!

-Bob
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Re: [time-nuts] S743 Marketplace Fariness Act - the thing that wouldn't die.

2013-04-24 Thread Mike S
Can we admit that this is completely off-topic for this list, and move 
on to appropriate topics?

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Re: [time-nuts] ngTADD-1

2013-04-24 Thread Kevin Rosenberg
On Apr 24, 2013, at 2:50 AM, Attila Kinali att...@kinali.ch wrote:
 [...]
 low jitter (sub 1ns rise/fall times). For the transmitters, if possible
 go for those with laser diodes and modulate them (ie no on-off switching).
 This will give you jitter way below 1ns (sorry, don't know any hard numbers).

For  1ns jitter, do you have a recommendation of 
modulation (ASK/PSK?) and carrier frequency?
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[time-nuts] Courtesy and Common Interests

2013-04-24 Thread johncroos

 


Re: [time-nuts] S743 Marketplace Fariness Act

 
And again, this thread has no business being on this list so please make it
go away guys.  The only reason I'm saying anything is to encourage people
to just stop!

-Bob


 Really  Well I am not so sure about that.

In response to a query to the group regarding a possible eBay message as coming 
from a hacker - I took the trouble and provided an answer that correctly 
illuminated the issue. 

Further since a good deal of the equipment we use comes from on-line purchases, 
both eBay and distributors, as well as private sales; I submit that this topic 
can potentially impact our hobby to some extent. It may drive some sources out 
of business. At this point who knows; as the bill has not yet become law. So I 
believe that some members may wish to weigh in on the topic with their 
representatives - but to do so they have to know that the issue exists. Since 
it may be of concern to some time-nuts I maintain that it is appropriate.

I do not contribute often here,  but when I do it is usually from my 44 years 
as a microwave engineer who did spread spectrum timing for the military years 
before GPS was even thought of. So now and then I just may have a useful idea 
that could benefit the topic at hand. Mostly my inputs are never acknowledged 
by as much as a simple thank you.

The above is just one example of how unfriendly and discourteous this list can 
be. Who the hell cares if few bytes of text are a bit off topic? And who is to 
say that no-one can benefit from it. Lets lighten up a bit.

-john k6iql







 
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[time-nuts] Trimble ACE Replacement?

2013-04-24 Thread Jason Rabel
I'm sure some of you noticed the flood of Tymserve 2100's on eBay lately, they 
were selling in lots of 3-4 (or more)! I managed to
pick up a few (like I really needed them) and proceeded to add in the GPS 
module to make them a little more useful.

I haven't seen any Trimble ACE receivers on eBay in a while. I was doing a 
little research and while the SveeSix seems the same
physical size and pinout, its COM settings do not appear to be adjustable (I 
could be wrong), but even the simple act of switching
between like TSIP  NMEA requires re-flashing the receiver, there was no 
mention of changing the comport settings in the
documentation.

So I started looking at the Lassen modules since that came after the ACE line. 
They too appear to be the same pinout, however their
physical size is different. They come in both 5v  3.3v flavors, and I managed 
to find someone on eBay selling a 5v one.

My question is, has anyone tried to get a TS2100 to communicate with a 
different receiver than the ACE line? Kind of curious what
works and what doesn't.

I did manage to get an Oncore UT+ off eBay for 1 cent (plus $8 shipping)... 
Can't beat that!

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