I have an MV89, and it draws about 320mA steady state. No cycling of the
current at all once warmed up. The surface temperature is warm, but you
can leave your hand on it.
Performance wise, the MV89 is very good. The ageing is particularly low
- after only a week from power-up it's running at unde
John,
Yes, the temperature and current are completely normal. I have my MV89
running on the bench here, and it's drawing 300mA and too hot to hold.
Don't think about lagging it to keep it warm, or adding cooling, as
you'll mess up the internal thermal profile, and then the calibration
and perform
I got one of them from one of those Chinese eBay sources. Hooked it up, let
it warm up,it does get rather warm to the touch. Problem is that I can't get
it on 10 MHz. Even if I connect the control voltage input directly to the
reference voltage out, it is still low by about 4 Hz. Another thing, the
I looked up the specifications to be sure, they state a steady state current
of less than 350 mA after warm up. Also, after about 10 minutes, it is too
hot to touch. Definitely bad. I am going to contact the seller.Thanks
___
time-nuts mailing list -- tim
My MV89 runs 56 C on the outside of its case in a room with a 27 C ambient.
I can touch it but can't leave my fingers there long. I realize that OCXOs
are supposed to be warm but this is way hotter than anything else I have.
The current draw seems OK, less than 300 mA after warm up. Is this normal?
FWIW - Morion made in St Petersburg, and company owned by Frequency
Electronics Inc.
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of John Green
Sent: 22 September 2009 20:10
To: time-nuts@febo.com
Subject: [time-nuts] Morion MV89
In message , John
Green writes:
>My MV89 runs 56 C on the outside of its case in a room with a 27 C ambient.
>I can touch it but can't leave my fingers there long. I realize that OCXOs
>are supposed to be warm but this is way hotter than anything else I have.
>The current draw seems OK, less than
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 scop
--
Message: 2
Date: Wed, 08 Feb 2012 22:15:41 -0600
From: Scott Newell
To: time-nuts@febo.com
Subject: [time-nuts] Morion MV89 output level?
Message-ID:
Content-Type: text/plain; charset="us-ascii"; format=flowed
Got my replacement FE-5680 and a MV
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 medium-te
Hello there,
I'm trying to build a low phase noise signal generator with a Morion MV89 OCXO.
( http://www.morion.com.ru/catalog_pdf/MV89-OCXO.pdf )
The 10 MHz Sine coming from the MV89 shall be converted to a 10 MHz rectangle
with the LTC6957-3 ( http://cds.linear.com/docs/en/datasheet/6957f.pdf
Hi Nevell,
FYI my one delivers almost +5dBm on 50 Ohm.Ref Voltage +4,86 Volt.
Rgds Ernie.
-Original Message-
From: Scott Newell
To: time-nuts
Sent: Thu, Feb 9, 2012 5:16 am
Subject: [time-nuts] Morion MV89 output level?
Got my replacement FE-5680 and a MV89 in from
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 07/31
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 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 around the output bypass
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 aroun
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 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 reliability of
electronics is sto
-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
urement
Subject: Re: [time-nuts] Morion MV89 output level?
On Wed, Feb 8, 2012 at 11:25 PM, Sam 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
On Thu, Feb 9, 2012 at 9:25 AM, Bob Camp 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 the mom
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.
It'
> 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
rds...
Don
- 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?
It is AC coupled. In fact, many of these units have a bad capacitor and a very
low output. If you get one like that, you will need to open the can and replace
the SMT capacitor.
I believe it is designed to drive a 50 ohm load but I do not know what effect
that will have on the phase noise.
Re
One thing to be aware of on the MV89 is that it is a 5 MHz osc that uses a
freq doubler.
On the ones I've tested, without further filtering, every other cycle's
period is different by ~ 1 ns or so.
For a time nut that likes to see < 1ps jitter, it is a whole lot of cycle to
cycle edge jitter t
Hi
You would want a 50 ohm load on the output of the OCXO. Based on recent
experience, you may have to buy 10 or more before you find one that is
reasonably close to working correctly. The low output issues are far from the
only problem on these units.
Bob
On Nov 6, 2013, at 9:27 AM, Hagaaar
Ok... maybe i´ll make a not so smart question but... if the MV89 is bad,
what´s the recomended parts from ebay for something like that? (10MHz
OCXO to upgrade some sort of equipment)
(I´m asking because I did almost the same thing than our friend Hagar...
I noticed that the MV89 wasn´t as go
Hi
All of the eBay OCXO’s are pulled from scrap gear. If they have been on eBay
for a while, it’s a good bet that the gear has been pretty well picked over.
The only time you can get fairly good parts is when the first hit the market.
Bob
On Nov 6, 2013, at 5:54 PM, Daniel Mendes wrote:
>
Daniel, I suggest a MTI 260 OCXO or an Oscilloquartz 8663.
On Thu, Nov 7, 2013 at 1:47 AM, Bob Camp wrote:
> Hi
>
> All of the eBay OCXO’s are pulled from scrap gear. If they have been on eBay
> for a while, it’s a good bet that the gear has been pretty well picked over.
> The only time you can
ive suggestions, please let me know!
> Von: Azelio Boriani
> Datum: 7. November 2013 11:16:11 MEZ
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] Morion MV89 and LTC6957
> Antwort an: Discussion of precise time and frequency measurement
rnative suggestions, please let me know!
>
>
>
>
>
>> Von: Azelio Boriani
>> Datum: 7. November 2013 11:16:11 MEZ
>> An: Discussion of precise time and frequency measurement
>> Betreff: Re: [time-nuts] Morion MV89 and LTC6957
>> Antwort an: Discussion of
On Fri, 8 Nov 2013 16:55:29 +0100
HagaaarTheHorrible wrote:
> Doesn't sound too good I'm afraid... in addition to the shipping issues, I
> wonder if it was the right decision to use this OCXO...
> Are there any "low phase noise" OCXO available (preferably from stock) from
> more "conventional"
Nachricht-
Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im
Auftrag von Attila Kinali
Gesendet: Samstag, 9. November 2013 09:04
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] Morion MV89 and LTC6957
On Fri, 8 Nov 2013 16:5
Moin Bernd,
On Mon, 11 Nov 2013 12:47:15 +0100
"Bernd Neubig" wrote:
> > " Unfortunately, since they redesigned their webpages, i cannot find the
> > OCXOs listed anywhere anymore (only the 8607 shows up)."
>
> Oscilloquartz has discontinued their OCXO line. The only exception is the
> BVA OCXO
...and, all of their products that use OCXOs?
On Mon, Nov 11, 2013 at 1:32 PM, Attila Kinali wrote:
> Moin Bernd,
>
>
> On Mon, 11 Nov 2013 12:47:15 +0100
> "Bernd Neubig" wrote:
>
>> > " Unfortunately, since they redesigned their webpages, i cannot find the
>> > OCXOs listed anywhere anymore (o
On 2013-11-11 05:32, Attila Kinali wrote:
Moin Bernd,
On Mon, 11 Nov 2013 12:47:15 +0100
"Bernd Neubig" wrote:
" Unfortunately, since they redesigned their webpages, i cannot find the
OCXOs listed anywhere anymore (only the 8607 shows up)."
Oscilloquartz has discontinued their OCXO line. T
On 11/11/2013 06:37 PM, Brian Inglis wrote:
> On 2013-11-11 05:32, Attila Kinali wrote:
>> Moin Bernd,
>>
>>
>> On Mon, 11 Nov 2013 12:47:15 +0100
>> "Bernd Neubig" wrote:
>>
" Unfortunately, since they redesigned their webpages, i cannot
find the
OCXOs listed anywhere anymore (only
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