[time-nuts] EFRATOM MFTD-AC4 FREQUENCY REFERENCEDISTRIBUTIONAMP - update

phil fortime at bellsouth.net
Thu Jul 23 08:48:03 UTC 2009


Demain,
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.
Phil


----- 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


> Demain,
> 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? 
> http://www.freewebs.com/beststuff2u/MFS-207.pdf
> 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.
> Phil
>
> ----- 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 
>> 20
>> outputs. More than I could conceivably need. I looked inside. The supply 
>> is
>> 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 
>> level
>> 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
>> PDS
>> ------------------------------
>>>
>>> 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
>>> AMP
>>> 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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>
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