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
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
This topic has been addressed earlier; though with some
debate. I have proposed a simple heterodyne scheme for
beating 2 stable sources against each other observing
a 1KHz difference frequency to resolve 1uHz deltas.
This is NOT a state-of-the-art scheme, but it will
provide better than 1E-12
How do you pick the optimal difference frequency? I see that 1kHz has a
nice numerical property where you can read the frequency directly off
the counter, you just need to mentally prepend the first 4 digits. With
computers it's not that important, the difference can easily be a
strange
Hawkins [EMAIL PROTECTED]
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Sent: Friday, March 28, 2008 9:09 PM
Subject: Re: [time-nuts] Racal-Dana 1992 switches
Charles S. Osborne said, in part,
Now the real question is... is there a clever way to make the Racal
Jeff,
There's nothing magic about 1KHz as the heterodyne
frequency. I picked it to avoid power line pickup
permit a tuned circuit to limit the noise bandwidth.
But, any tuned circuit in the signal path will have
temperature driven phase variations possibly
signal level phase variations, as
Jeff Mock wrote:
How do you pick the optimal difference frequency? I see that 1kHz has a
nice numerical property where you can read the frequency directly off
the counter, you just need to mentally prepend the first 4 digits. With
computers it's not that important, the difference can
Charles S. Osborne wrote:
Now the real question is... is there a clever way to make the Racal 1992
readout the difference in µHz between two GPS disciplined oscillators? My
only other counter, an HP5384A, is offscale at 10.000 000.000 MHz . I'm
referencing the counter with one Lucent RFTG-m-XO
Actually, after two days of studying catalogs and datasheets, I think I
found a suitable replacement switch. The trick is to find the ones made for
tape packaging, which only have 2 pins -- the others have 4. The Omron
B3F-6050, available through Digikey as part no. SW798-ND is $0.28 each for
100
Back to the switches... I found a Jameco bag for the ones I bought way
back, which fitted pretty well and work. The part number was 115086,
then quoted for KIE22, but not the same as the current ones with that
number. Jameco might know who made the 115086, but there are no clues
from the
Charles S. Osborne said, in part,
Now the real question is... is there a clever way to make the Racal
1992 readout the difference in µHz between two GPS disciplined
oscillators? My only other counter, an HP5384A, is offscale at 10.000
000.000 MHz . I'm referencing the counter with one Lucent
K4CSO
Duluth, GA
- Original Message -
From: Matt Ettus [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Monday, March 24, 2008 1:46 PM
Subject: Re: [time-nuts] Racal-Dana 1992 switches
On Mon, Mar 10, 2008 at 8:47 AM
I fixed the switches on my Pacific Measurements 1038-N10 by adding a small
coil spring to the insides of each switch. I don't remember it being very hard
to do. There is even a place in the center of each switch that is perfect for
putting the spring. The springs were something I had around in
On Mon, Mar 10, 2008 at 8:47 AM, Dan Rae [EMAIL PROTECTED] wrote:
David McGaw wrote:
Does anyone know of a source of push-button switches for the
Racal-Dana 1992? I have one that over half are bad. No luck from
Racal-Dana or their service house.
The original makers of that switch
Matt Ettus wrote:
On Mon, Mar 10, 2008 at 8:47 AM, Dan Rae [EMAIL PROTECTED] wrote:
The last time I did this I found a switch at Jameco that was a near
exact replacement. The only difference was that the button was a little
too loose a fit and needed a dab of epoxy inside to hold it
] Racal-Dana 1992 switches
On Tue, Mar 11, 2008 at 1:05 PM, Dan Rae [EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] wrote:
Are these switches the same as the ones in the 1996? Mine works
perfectly now, but if the switches are a ticking time bomb,
I'm going
to move it to a area with better
On Tue, Mar 11, 2008 at 1:05 PM, Dan Rae [EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] wrote:
Are these switches the same as the ones in the 1996? Mine works perfectly
now, but if the switches are a ticking time bomb, I'm going to move it to a
area with better temperature control, and start
Are these switches the same as the ones in the 1996? Mine works perfectly now,
but if the switches are a ticking time bomb, I'm going to move it to a area
with better temperature control, and start looking for a donor unit just in
case.
-Dave
-- Original message --
[EMAIL PROTECTED] wrote:
Are these switches the same as the ones in the 1996? Mine works perfectly
now, but if the switches are a ticking time bomb, I'm going to move it to a
area with better temperature control, and start looking for a donor unit just
in case.
They both used the same
David McGaw wrote:
Does anyone know of a source of push-button switches for the
Racal-Dana 1992? I have one that over half are bad. No luck from
Racal-Dana or their service house.
The original makers of that switch (Omron?) stopped making them years
ago. I wonder why?
The last time I
Does anyone know of a source of push-button switches for the
Racal-Dana 1992? I have one that over half are bad. No luck from
Racal-Dana or their service house.
Thanks,
David
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Had the same trouble!!! bought a junk racal unit (they have several models) for
$10 stole the switches from it!!! Sad way to send a unit to the scrap BIN!!!
The unit is EXCELLENT well worth the repair effort
Norm
David McGaw [EMAIL PROTECTED] wrote:
Does anyone know of a source of
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