http://www.rbarrios.com/projects/MV89A/
-=Bryan=-
> To: time-nuts@febo.com
> From: a...@pcscons.com
> Date: Tue, 20 Sep 2016 15:09:41 -0700
> Subject: Re: [time-nuts] Normal operating specs of a Morion MV89?
>
> Hi Brian
>
> which cap is failing in the MV89 oxco-s?
> 73
>
> KJ6UHN
>
> Alex
>
More downsizing.
One unit works 100% (I have been using it for years). It includes the
5 MHz option board, which I have disabled, for 10 MHz use. I have also
disabled the DC voltage on the four outputs, as I wasn't using the
external Taps. These functions can be very easily restored if you need
th
I'm in.
https://goo.gl/photos/SDHtvgFmftQq6vYJA
But the EFC wire goes deeper, so I'll keep at it. It is fighting me the
whole way.
-- Christopher
73 de AI6KG
On Tue, Sep 20, 2016 at 7:54 AM, Chuck Harris wrote:
> That is the board that contains the heater
> controller, and the output buff
These have been discussed before at some length. It is not just the
output cap that is easily damaged by rough salvage efforts, which
however are sadly common enough. There is also a frequently seen
problem of bad output spectra with a lot of non harmonic related stuff
in the output, not a pr
Hi
There is an output coupling cap that is close to the output pin. It is not
clear if it is
failing or simply damaged by the salvage process. Best guess is that some fail,
but
far more are damaged parts.
Bob
> On Sep 20, 2016, at 6:09 PM, Alex Pummer wrote:
>
> Hi Brian
>
> which cap is
Hi
At least the MV89’s that I have bought have been mostly defective. The issues
in them are many
and some of them are only apparent with fairly exotic testing There are a lot
with defective output
capacitors, but many of those also have other issues as well. Unless you have a
lot of time, rep
bruce.griffi...@xtra.co.nz said:
>> It is possible to check the output level without an oscilloscope ?
> Only with a clasical (diode detector) RF probe (they're still available) or
> an RF power meter.
How about a diode, small cap, and a DC meter? (and a few clip leads)
It won't give an accu
Hi Brian
which cap is failing in the MV89 oxco-s?
73
KJ6UHN
Alex
On 9/20/2016 2:41 PM, Bryan _ wrote:
Any tips on resoldering the can, special solder or flux required? Quite often
they can be found for a good price on Ebay, from what I have read they are a
good OCXO minus the issue of the
Any tips on resoldering the can, special solder or flux required? Quite often
they can be found for a good price on Ebay, from what I have read they are a
good OCXO minus the issue of the one particular cap failing.
-=Bryan=-
> From: brayn...@gmail.com
> Date: Tue, 20 Sep 2016 20:06:59 +
On Tuesday, September 20, 2016 01:53:49 PM Tim Lister wrote:
> On Tue, Sep 20, 2016 at 12:56 PM, Bryan _
wrote:
> > May also want to check the output amplitude. If memory serves me
correct
> > it is very common for a capacitor inside this model number to fail. It
> > can be fixed but requires a
On Tue, Sep 20, 2016 at 12:56 PM, Bryan _ wrote:
> May also want to check the output amplitude. If memory serves me correct it
> is very common for a capacitor inside this model number to fail. It can be
> fixed but requires a torch or a pretty heavy duty soldering iron to get the
> can open.
>
Yes. This low output due to capacitor failure is a very common failure.
>From the last set of MV89a I got on the bay, all had this issue.
I had good luck opening mine with a hot air rework station with a small
nozzle to blow the solder seal away. A bit of careful prying with a thin
flat screwdrive
May also want to check the output amplitude. If memory serves me correct it is
very common for a capacitor inside this model number to fail. It can be fixed
but requires a torch or a pretty heavy duty soldering iron to get the can open.
http://www.rbarrios.com/projects/MV89A/
-=Bryan=-
> From
That is the board that contains the heater
controller, and the output buffer.
You need to get into the tiny vacuum thermos
bottle where all of the wires go.
-Chuck Harris
Christopher Hoover wrote:
> Top of the board stack
>
> https://goo.gl/photos/cUBtdTYHHWX4ZRbx8
> ___
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