[time-nuts] EFRATOM MFTD-AC4 FREQUENCY REFERENCEDISTRIBUTIONAMP - update
fortime at bellsouth.net
Thu Jul 23 08:48:03 UTC 2009
Apparently, in my rush I misread that data sheet. If it can't be easily
modified, some of the guys were offering a decent distribution board at a
reasonable price. I too need a sine wave rather than square. It still makes
one heck of a nice housing so nothing is lost.
----- Original Message -----
From: "phil" <fortime at bellsouth.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Thursday, July 23, 2009 4:29 AM
Subject: Re: [time-nuts] EFRATOM MFTD-AC4 FREQUENCY
REFERENCEDISTRIBUTIONAMP - update
> I too bought a couple of that same model but it will be about a week
> before I have receive them.
> Did you see that data sheet that Bruce linked to?
> From what I understood of the distribution modules (MBF), each module had
> 4 different outputs, each module a .1, 1, 5, 10 MHz.
> Most of the standards that same seller had appeared to be 5 MHz out so I
> expected a 5 meg input. That same data sheet states under MBF options that
> most of the modules are 5/10 MHz input but two were dedicated 5 or 10 meg
> only. Perhaps we got the 5 meg only ! From what you are saying, each port
> on the MBF module is outputting the same thing, strictly distribution.
> That's fine, perhaps they meant the MFT would pass .1 to 10 meg. If that's
> the case we should still be able to modify the input module. My
> application is the same as yours, not a "time-nut" application!
> I though it worth the gamble for the cheap price.
> ----- Original Message -----
> From: "Demian Martin" <demianm_1 at yahoo.com>
> To: <time-nuts at febo.com>
> Sent: Thursday, July 23, 2009 3:48 AM
> Subject: Re: [time-nuts] EFRATOM MFTD-AC4 FREQUENCY REFERENCE
> DISTRIBUTIONAMP - update
>>I received the unit. The shipping and packing was very good- no peanuts!
>> The one I got was different from what I expected. It's a 5 MHz unit with
>> outputs. More than I could conceivably need. I looked inside. The supply
>> actually 25V. The input module has an FPGA for some reason, probably to
>> communicate fault back to a host. The signal is distributed as a low
>> square wave on the backplane and amplified through a high gain tuned amp
>> before going to the output amps. The outputs are all monitored.
>> I need to figure out the tuned circuit so I can retune it. Would the
>> performance be better if I bypass the input module and drive the output
>> modules with a sine wave? I'm using it as a reference for some
>> not-too-sophisticated counters and generators so the phase noise will be
>> much better than those could benefit from regardless.
>> Demian Martin
>>> Message: 2
>>> Date: Mon, 20 Jul 2009 22:46:44 -0700
>>> From: "Demian Martin" <demianm_1 at yahoo.com>
>>> Subject: [time-nuts] EFRATOM MFTD-AC4 FREQUENCY REFERENCE DISTRIBUTION
>>> To: <time-nuts at febo.com>
>>> Message-ID: <9A1668B965254471953484D102B6A96C at PDSDesktop>
>>> Content-Type: text/plain; charset="us-ascii"
>>> EFRATOM MFTD-AC4 FREQUENCY REFERENCE DISTRIBUTION AMP
>>> I just bought this off eBay. I was about to look into
>>> building one but for
>>> $50 + $25 shipping I could not justify the effort. They have
>>> 6 more. Item
>>> number 290330439821. Probably a deal for the box alone.
>>> Is there anything I should know about it? I'm planning to mount a
>>> Thunderbolt inside it. There is a decent datasheet on the
>>> family of products
>>> here: http://www.freewebs.com/beststuff2u/MFS-207.pdf
>>> Demian Martin
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