Did you ever run any tests on those UCT double oven OCXOs?
Only to the extent of running a short (10-minute) HDEV test after a ~2 hour
warmup, to see if it was capable of anything interesting near t=10s to
t=30s. It showed about 2E-12, and the PN was nothing special, so I didn't
do anything
- Original Message -
From: John Miles
To: 'Discussion of precise time and frequency measurement'
Sent: Friday, February 10, 2012 3:28 AM
Subject: Re: [time-nuts] Morion MV89 output level?
Did you ever run any tests on those UCT double oven OCXOs?
Only to the extent of running
Don't be afraid and open up your MV89. I have done this with many MV201
without problems.
On Thu, Feb 9, 2012 at 8:25 AM, Sam li...@digitalelectric.com.au wrote:
I just powered up one of my MV89A's and measured ~7 dBm into my HP 8920B,
but as Tom has mentioned some MV89A's develop
a dry joint
Hi
It's a solder seal can and if you have the right gear it comes open easy. If
you happen to have a 1KW RF induction heater they are very easy to open. If by
the odd chance you don't have one of those, a nice big soldering iron (or two)
can come in handy. Solder wick and working your way
Would it be better to apply heat the metal shell or to apply heat the
bottom part with the I/O pins ?
I would start using a propane gas torch. Heating quickly till I saw the
solder flow.
Stan, W1LECape Cod
On 2/9/2012 6:04 AM, Azelio Boriani wrote:
Don't be afraid and open up your MV89.
I use a hot gun directing heat on the soldered edge. Use a soldering iron
and the solder wick as suggested gives the best result, in my opinion. It
helps if more than 1 working around the OCXO as at some moment you have to
use one or two pins to lift the bottom cover using pliers. I have done this
If you do open it up Scott, Don't forget to take some photos of the guts of it.
I wouldn't mind seeing inside one of these.
Sam
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On Wed, Feb 8, 2012 at 11:25 PM, Sam li...@digitalelectric.com.au wrote:
...but as Tom has mentioned some MV89A's develop
a dry joint around the output bypass capacitor
Now that I think of it, it is surprising to me that OCXOs even work.
About the worst thing you can do to kill the
-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Stan, W1LE
Sent: Thursday, February 09, 2012 7:47 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Morion MV89 output level?
Would it be better to apply heat the metal shell or to apply heat
: Re: [time-nuts] Morion MV89 output level?
On Wed, Feb 8, 2012 at 11:25 PM, Sam li...@digitalelectric.com.au wrote:
...but as Tom has mentioned some MV89A's develop
a dry joint around the output bypass capacitor
Now that I think of it, it is surprising to me that OCXOs even work.
About
On Thu, Feb 9, 2012 at 9:25 AM, Bob Camp li...@rtty.us wrote:
Hi
Are you worried about phase noise at 100 Hz and above (Trimble OCXO) or
about sort term stability at 1 to 100 seconds (MV89)? Two different things,
and you don't get both at the same time on the crop of what's up for auction
at
At 11:20 AM 2/9/2012, Bob Camp wrote:
Hi
I would avoid super heat type approaches. The risk is getting the glass to
metal seals on the base to hot to fast. Normally the can needs more heat
than the base, but not always. A lot depends on just how thick each one is
and what they are made of.
John,
Did you ever run any tests on those UCT double oven OCXOs? I've found them to
be freaky-stable long term. I have retrofitted a lot of Tek DC510/5010
counters with them and after over two years, the last digit is still right on.
They are capable of great
Got my replacement FE-5680 and a MV89 in from Nichegeek. I figured
I'd better power up and check the MV89 before I let 'em know
everything was ok. The MV89 is warming up nicely, the current is
down to 290 mA (and still dropping), but the output seems low; about
40 mV RMS as measured on a
--
Message: 2
Date: Wed, 08 Feb 2012 22:15:41 -0600
From: Scott Newell newell+timen...@n5tnl.com
To: time-nuts@febo.com
Subject: [time-nuts] Morion MV89 output level?
Message-ID: mailman.980.1328767168.1783.time-n...@febo.com
Content-Type: text/plain; charset=us
Hi Nevell,
FYI my one delivers almost +5dBm on 50 Ohm.Ref Voltage +4,86 Volt.
Rgds Ernie.
-Original Message-
From: Scott Newell newell+timen...@n5tnl.com
To: time-nuts time-nuts@febo.com
Sent: Thu, Feb 9, 2012 5:16 am
Subject: [time-nuts] Morion MV89 output level?
Got my
I just powered up one of my MV89A's and measured ~7 dBm into my HP 8920B, but
as Tom has mentioned some MV89A's develop
a dry joint around the output bypass capacitor
http://www.hellocq.net/forum/showthread.php?t=283551
What is the date and revision number on yours? I have 2 here 07/34 and
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