Re: [time-nuts] Racal-Dana 1992 switches

2008-04-03 Thread Tom Duckworth
Bruce  Rex,

You're both right. 1.25E-10 was for 40.000 000 005 GHz and 7.5E-11 is for
40.000 000 003 GHz. My bad, Good sleuthing.

Tom
Tom Duckworth
510-886-1396
 
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Rex
Sent: Wednesday, April 02, 2008 3:01 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Racal-Dana 1992 switches

Bruce Griffiths wrote:
 Tom Duckworth wrote:
   
 Bill,

 I have attached a PDF of two methods we used at XL Microwave for
adjusting
 the internal reference oscillators in our microwave counters. The second
 method (digital) was used to calibrate the internal reference time base
of a
 70 GHz microwave counter with an accuracy of parts in E-11.

 This digital method could be used to compare two GPSDOs, one to the
other,
 and would probably yield greater resolution than trying to use a phase
 measurement on a counter due to jitter, internal noise, and stability
issues
 in the count chain. This method proved to be fast, simple, stable, and
 superior to other methods we tried.

 Hope this helps.

 Tom
 Tom Duckworth
 510-886-1396
  
   
 
 Tom

 The first calculation at the bottom of the second page is incorrect the 
 result should be: 1.25E-10 not 7.5E-11.

 Bruce

   
The result was fine, but the measurement should have been 40.000 000 003 
GHz.  :-)

-Rex


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Re: [time-nuts] Adding prescaler to HP 5334B

2008-04-03 Thread Robert Berg
Thanks, Rick.

Bob

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Richard (Rick) Karlquist
Sent: Tuesday, April 01, 2008 8:05 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Adding prescaler to HP 5334B

The diode limiter is to protect the C channel
from getting burned out due to connecting a
transmitter to it, etc.  You don't need the
limiter if you aren't worried about this.
The detector gates off the counter when there
is insufficient signal to count reliably.
The detector is imperfect, and the counter
may read garbage anyway, or may be blanked
on a signal that would be countable.  For the
average time nuts user, you can leave out both
of these features with no harm.  I had to
design them in for marketing reasons.

Rick Karlquist
5334B Project Manager

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Re: [time-nuts] Oncore batteries

2008-04-03 Thread randy warner
Matthew,

Don't pull off the batteries! The boards are populated differently for
battery/non-battery uses. Your external battery will not be connected to the
onboard RAM.

That being said, not using batteries might be a good solution. First, the
old lithiums currently on the receivers are probably on their last legs
anyway. Secondly, as you mentioned, pulling power is a good easy way to
reset the GT+ receiver to binary with all messages disabled. This is the way
timing receivers are normally used because TTFF is not usually a concern,
and it eliminates the headache of replacing batteries out in the field. Can
you imagine every TDMA cell-site needing new batteries every 5-10 years?

One last item - Even without a battery a VP will save its setup information
through power cycles because the older Moto receivers such as the VP save
this information in EEPROM. To default these receivers you need to
explicitly send the binary default command.

Randy Warner

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Matthew Smith
Sent: Wednesday, April 02, 2008 7:10 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Connecting my Oncores

Quoth randy warner at 2008-04-03 11:09...
snip
 The battery can indeed cause some problems if you don't have the software
 necessary to reset the receiver to a known state. The simplest thing to do
 is get a copy of Rick Hambly's TAC32 at cnssys.com. TAC32 will light up
just
 about any Moto receiver ever made no matter what state it is in. 
/snip

Thanks Randy; I just downloaded TAC32 and it's got one of my catatonic 
GT+s talking to me now.  I'll leave it to its devices for a while longer 
and then try the other one.

I'm going to be mounting all the modules with interface and power supply 
boards and will be feeding backup power from an AA-size lithium battery. 
  So, those on-board batteries will be coming OFF!  If anything goes 
wrong then, I can just power down, pop out the backup battery (or unplug 
the module) and hopefully get back to a default state.

Now I discover that I don't have a good sky view so think that I'll have 
to wait until the builder finally turns up (already 6 months late) and 
can get my antennas up on the ridge cap.


Cheers

M

-- 
Matthew Smith
Smiffytech - Technology Consulting  Web Application Development
Business: http://www.smiffytech.com/
Personal: http://www.smiffysplace.com/
LinkedIn: http://www.linkedin.com/in/smiffy

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Re: [time-nuts] time-nuts Digest, Vol 45, Issue 7

2008-04-03 Thread MITCHELL JANOFF
There is a great line in the new (you'll get it shortly) Nut and Volts where 
someone writes in saying they finally bought a new computer only to realize 
there was no parallel port. They wanted to know how they were going to use 
their 3 printers connected via a switch.  The answer fromNV was,you should 
become familiar with google (www.google.com). Seems like something you would 
write. That got me thinking, you could write a know it all column somewhere 
and use the Kindle to get all the answers. No work, all the glory...I should 
have thought of that.
   
  The Steve Martin movie is Bowfinger. The restaurant is 
http://www.bofingerparis.com/
   
  It could all be just a story someone made up...
   
  m.
   
  

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Today's Topics:

1. Re: Adding prescaler to HP 5334B (Robert Berg)


--

Message: 1
Date: Thu, 3 Apr 2008 08:07:57 -0700
From: Robert Berg 
Subject: Re: [time-nuts] Adding prescaler to HP 5334B
To: 'Discussion of precise time and frequency measurement'

Message-ID: [EMAIL PROTECTED]@pobox.com
Content-Type: text/plain; charset=us-ascii

Thanks, Rick.

Bob

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Richard (Rick) Karlquist
Sent: Tuesday, April 01, 2008 8:05 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Adding prescaler to HP 5334B

The diode limiter is to protect the C channel
from getting burned out due to connecting a
transmitter to it, etc. You don't need the
limiter if you aren't worried about this.
The detector gates off the counter when there
is insufficient signal to count reliably.
The detector is imperfect, and the counter
may read garbage anyway, or may be blanked
on a signal that would be countable. For the
average time nuts user, you can leave out both
of these features with no harm. I had to
design them in for marketing reasons.

Rick Karlquist
5334B Project Manager

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End of time-nuts Digest, Vol 45, Issue 7


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