[time-nuts] EFRATOM MFTD-AC4 FREQUENCY REFERENCE DISTRIBUTIONAMP - update

[Samuel D. [x86/CPC]]

Just to let you know I ordered from Bob (the well-known fluke.l on eBay)
what seems to be a small distribution amplifier. The PCB features 6 outputs
(2-sine, 4-square) with an external input (5-20 MHz), an integrated OCXO and
powered with +12V. Priced 68 USD or @ 50 USD without the OCXO. Don't know
anything about the performances nor internal construction/chip used, but
I'll post some kind of review as soon as I'll got it. Bob sells a case for
USD5, but with only 4 outputs.

EBay link : http://cpc.cx/iO (Item #290329158017)

---------------------
Samuel DEMEULEMEESTER
Presse Non Stop - Canard PC
http://www.canardpc.com
Tel : +33.6.13.73.4003
MSN : sam at x86.fr 

-----Message d'origine-----
De : time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] De la
part de phil
Envoyé : jeudi 23 juillet 2009 10:29
À : Discussion of precise time and frequency measurement
Objet : Re: [time-nuts] EFRATOM MFTD-AC4 FREQUENCY REFERENCE DISTRIBUTIONAMP
- 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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