[time-nuts] FS: HP 10811A

Has hole for coarse frequency adjust on the top. Edgecard connector and two mounting studs are on the bottom. I don't remember which piece of HP test equipment this came out of. Probably one of the Universal Counters. $100 OBO, plus shipping/insurance. Joe Gray W5JG

[time-nuts] FS: FE-5680A, 2 each

Info here: http://www.ko4bb.com/doku2015/doku.php?id=precision_timing:fe5680a_faq These are the fixed 10 MHz variety. Everything hooks up to the DE-9 connector. $100 each OBO, plus shipping/insurance. Joe Gray W5JG ___ time-nuts mailing list --

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

You are certainly no where near -40 dBm into 50 ohms as the blog Bryan posted above. Your setup may have 70-80 pF of load (~220 Ohms), if you also measured the output voltage with a 10x probe you could work backwards to see how close you are to 50 Ohms output. Roughly speaking it sounds like it

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

On Wed, Sep 28, 2016 at 11:46 AM, Tom Miller wrote: > Just put a 47 or 56 ohm resistor from the output pin to ground and look at > it with a X10 scope probe. > > Do you get a sine wave? Over 1 volt pp? Hi Tom, Scott, I used about two feet of a (Pomona) coax to

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

Just put a 47 or 56 ohm resistor from the output pin to ground and look at it with a X10 scope probe. Do you get a sine wave? Over 1 volt pp? Otherwise, you can open up the can and replace the output chip capacitor. Regards - Original Message - From: "Scott Stobbe"

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

If you used a 10x probe (10 Meg || 10-15 pF) you may have a pretty weak output, but if you could drive a meter of coax or a 1x probe to 800 mVrms at 10 MHz your probably not too far off spec. 100 pF at 10 MHz is 160 Ohms. On Wed, Sep 28, 2016 at 12:39 PM, Tim Lister wrote:

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

From my experience, your best and cheapest approach is to contact the seller and see if they will just send you a replacement. If the seller won't cooperate, and insists that you return the item, just close the issue and try to repair it, or buy another one. If you bought the MV89 from an

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

On Wed, Sep 28, 2016 at 4:14 AM, Bob Camp wrote: > Hi > > You have one of the many MV89A’s with an output problem. To be absolutely > sure of the output, you need to have the scope set to 50 ohm input. If it was > set > to Hi-Z, the output is likely even lower….. It seems that

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

Your oscilloscope fft is plotting single-side amplitude spectrum in V/rtHz (dBV/rtHz), this is in contrast to a spectrum analyzer which plots power spectral density W/Hz or (dBm/Hz). So -2.17 dBv is 10^(-2.17/20) = 0.779 Vrms comparing this to your Vpk-pk measurement 2.3 / 2 / sqrt(2) = 0.813

Re: [time-nuts] Efratom MFS-209 conversion information.

Hi Colin, The MBF distribution modules are all simple buffers, and are mounted on the back panel. Being distribution modules, they typically have 4 BNC outputs per module. The MBF module you want to modify is the one that *drives* the MBF distribution modules. It is of the same species as the

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

Hi You have one of the many MV89A’s with an output problem. To be absolutely sure of the output, you need to have the scope set to 50 ohm input. If it was set to Hi-Z, the output is likely even lower….. Bob > On Sep 28, 2016, at 1:38 AM, Tim Lister wrote: > > On Tue,

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

Take care that the 'scope is not a 50 ohm load: the TDS2024B has not the 50ohm/1Mohm input selection. So far I wasn't able to get from the 'scope FFT the same measurements that I get from a spectrum analyzer. On Wed, Sep 28, 2016 at 7:38 AM, Tim Lister wrote: > On Tue, Sep