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 : [email protected] -----Message d'origine----- De : [email protected] [mailto:[email protected]] 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" <[email protected]> To: <[email protected]> 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" <[email protected]> >> Subject: [time-nuts] EFRATOM MFTD-AC4 FREQUENCY REFERENCE DISTRIBUTION >> AMP >> To: <[email protected]> >> 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 > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
