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" <demian...@yahoo.com>
To: <time-nuts@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" <demian...@yahoo.com>
Subject: [time-nuts] EFRATOM MFTD-AC4 FREQUENCY REFERENCE DISTRIBUTION
AMP
To: <time-nuts@febo.com>
Message-ID: <9a1668b965254471953484d102b6a...@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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