Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Bryan _
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 >

[time-nuts] FS: Spectracom 8140 frequency distribution amps

2016-09-20 Thread Joseph Gray
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

Re: [time-nuts] Inside of FT1200-100

2016-09-20 Thread Christopher Hoover
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

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Dan Rae
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

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Bob Camp
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

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Bob Camp
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

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Hal Murray
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

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Alex Pummer
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

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Bryan _
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 +

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Bruce Griffiths
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

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Tim Lister
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. >

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Brian M
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

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-20 Thread Bryan _
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

Re: [time-nuts] Inside of FT1200-100

2016-09-20 Thread Chuck Harris
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 > ___