Hi MIght have to move a few things in the shed to fin in an F16.
If they were used in quantity there aught to be cable and connectors out there. The only reason I have the stuff I do is good old IBM and their approach to networking back in the old days. It would be tough to properly drive an R-390 otherwise. Bob On Feb 27, 2010, at 10:10 PM, Bruce Griffiths wrote: > You could look at a surplus F16 (probably wont fit in your garage though) or > similar STP was heavily used in MIL STD 1553 avionics buses. > > Bruce > > Bob Camp wrote: >> Hi >> >> Sure never seen any of them on any gear in my junk pile. >> >> I also never seen a customer ask for them as an output connector on an >> oscillator. I wonder how common they actually are. >> >> Bob >> >> >> On Feb 27, 2010, at 9:59 PM, Bruce Griffiths wrote: >> >> >>> Actually there are miniature twinax style connectors, for example: >>> http://www.amphenolrf.com/products/twinbnc.asp?N=0&sid=4B8860805409E17F& >>> <http://www.amphenolrf.com/products/twinbnc.asp?N=0&sid=4B8860805409E17F&> >>> >>> Bruce >>> >>> Bob Camp wrote: >>> >>>> Hi >>>> >>>> I don't even have the counter and already we're butchering it.... >>>> >>>> The big issue is suitable twin-ax connectors and cable. I have both, but >>>> they are *big*. They never really made it into the world of miniature >>>> connectors and miniature cable. >>>> >>>> Shielded twisted pair would be another option. That eliminates the cable >>>> as an issue. Small connectors (BNC drop in) are still an issue though. >>>> >>>> Bob >>>> >>>> >>>> On Feb 27, 2010, at 9:48 PM, Bruce Griffiths wrote: >>>> >>>> >>>> >>>>> Since the input amplifier and trigger circuit are located on a small >>>>> daughter board it wouldn't be too difficult to replace this with an LVDS >>>>> to CML stage. >>>>> The only remaining isue would be what input connector to use (twinax??, >>>>> SATA??). >>>>> >>>>> Bruce >>>>> >>>>> Bob Camp wrote: >>>>> >>>>> >>>>>> Hi >>>>>> >>>>>> Gee, LVDS what an unusual approach :).... >>>>>> >>>>>> It would be nice if these instruments had a balanced input. Common mode >>>>>> noise is indeed an issue in a lot of cases. >>>>>> >>>>>> Of course wrapping the coax headed to the counter 10X around a fairly >>>>>> large core can help things a bit. >>>>>> >>>>>> Bob >>>>>> >>>>>> >>>>>> On Feb 27, 2010, at 9:32 PM, Bruce Griffiths wrote: >>>>>> >>>>>> >>>>>> >>>>>> >>>>>>> If one is feeling paranoid about ground loop noise (and wishes to avoid >>>>>>> transformers, optoisolators , or fibre optics), etc one could always >>>>>>> use an LVDS driver with a batter powered(?) LVDS to CMOS >>>>>>> receiver/translator right at the 5370A/B input BNC connector. >>>>>>> This may be useful for a DMTD system that uses a 5370A/B. >>>>>>> >>>>>>> Bruce >>>>>>> >>>>>>> Bob Camp wrote: >>>>>>> >>>>>>> >>>>>>> >>>>>>>> Hi >>>>>>>> >>>>>>>> AC cmos will easily drive an L pad to match a 50 ohm cable at these >>>>>>>> levels. That's true at either 3.3 or at 5.0 volts. There are a lot of >>>>>>>> cmos families out there that beat AC for speed and match the output >>>>>>>> drive capability. >>>>>>>> >>>>>>>> Bob >>>>>>>> >>>>>>>> >>>>>>>> On Feb 27, 2010, at 9:12 PM, Bruce Griffiths wrote: >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>> 1) One method with 5V CMOS is to add a resistive voltage divider at >>>>>>>>> the CMOS driver output with a 50 ohm output impedance at the tap that >>>>>>>>> drives the 5370A/B input. >>>>>>>>> >>>>>>>>> 2) If one has a 5V 50 ohm driver (eg Thunderbolt PPS output) use a 50 >>>>>>>>> ohm attenuator at the 5370A/B input. >>>>>>>>> For a 5370A an attenuation of at least 11dB is required. >>>>>>>>> For a 5370B an attenuation of at least 3dB is required. >>>>>>>>> >>>>>>>>> 3) One can always use the 10x input attenuation setting built in to >>>>>>>>> the 5370A/B however this reduces the signal swing to 0.5V at the >>>>>>>>> trigger amplifier input (5V CMOS input). >>>>>>>>> >>>>>>>>> 4) Attenuate the output of the logic signal by a factor of 2 and use >>>>>>>>> an npn emitter follower to drive the 50 ohm load. >>>>>>>>> >>>>>>>>> 5) Use 3.3V CMOS signal levels for the 5370B. >>>>>>>>> >>>>>>>>> 6) Use a current mode emitter or source coupled switch to drive the >>>>>>>>> 5370A/B input. >>>>>>>>> >>>>>>>>> The switching jitter of the above drivers will be much lower than the >>>>>>>>> internal noise of the 5370A/B as long as HCMOS or faster logic is >>>>>>>>> employed. >>>>>>>>> >>>>>>>>> Bruce >>>>>>>>> >>>>>>>>> >>>>>>>>> Bob Camp wrote: >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>>> Hi >>>>>>>>>> >>>>>>>>>> Which *still* carefully avoids the issue of how ..... >>>>>>>>>> >>>>>>>>>> Bob >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Feb 27, 2010, at 8:52 PM, Bruce Griffiths wrote: >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>>> Oops! a small correction (2nd paragraph): >>>>>>>>>>> >>>>>>>>>>> For the 5370A attenuating the 5V CMOS signal to a 1V swing with the >>>>>>>>>>> threshold set to 0.5V is close to optimum. >>>>>>>>>>> An input signal with limits of 0V and +1.4V with a trigger >>>>>>>>>>> threshold of 0.7V is the maximum usable (for high performance). >>>>>>>>>>> An input signal with limits of 0V and +0.3V with a trigger >>>>>>>>>>> threshold of 0.15V is the minimum usable (for high performance). >>>>>>>>>>> >>>>>>>>>>> For the 5370B attenuating the 5V CMOS signal to a 2V swing with the >>>>>>>>>>> threshold set to 1V is close to optimum. >>>>>>>>>>> An input signal with limits of 0V and +3.5V with a trigger >>>>>>>>>>> threshold of 0.7V is the maximum usable (for high performance). >>>>>>>>>>> An input signal with limits of 0V and +0.3V with a trigger >>>>>>>>>>> threshold of 0.15V is the minimum usable (for high performance). >>>>>>>>>>> >>>>>>>>>>> Thus using the PPS output (~270 ohm is series with a 5V 74AC04 >>>>>>>>>>> output) from a Synergy evaluation board that uses an M12M or M12+ >>>>>>>>>>> GPS timing receiver to drive the inputs (with a 0-750mV signal) of >>>>>>>>>>> a 5370A or 5370B is well within the recommended input signal range >>>>>>>>>>> for high performance. >>>>>>>>>>> This avoids having to adding an external 5V 50 ohm driver that some >>>>>>>>>>> would use. >>>>>>>>>>> >>>>>>>>>>> Bruce >>>>>>>>>>> >>>>>>>>>>> Bob Camp wrote: >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>>> Hi >>>>>>>>>>>> >>>>>>>>>>>> So exactly how did you know that I bought a (cheap) 5370B a few >>>>>>>>>>>> hours ago on the e-place and was just about to ask about how best >>>>>>>>>>>> to use it. >>>>>>>>>>>> >>>>>>>>>>>> Hmmmm....... >>>>>>>>>>>> >>>>>>>>>>>> Bob >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> On Feb 27, 2010, at 7:01 PM, Bruce Griffiths wrote: >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>>> The attached excerpts from the 5370A and 5370B manuals indicate >>>>>>>>>>>>> that for best performance, that the common practice of driving >>>>>>>>>>>>> the 5370A/B 1x inputs directly from a 5V CMOS logic signal is a >>>>>>>>>>>>> bad idea. >>>>>>>>>>>>> >>>>>>>>>>>>> For the 5370A attenuating the 5V CMOS signal to a 1V swing with >>>>>>>>>>>>> the threshold set to 0.5V is close to optimum. >>>>>>>>>>>>> An input signal with limits of 0V and +1.4V with a trigger >>>>>>>>>>>>> threshold of 0.7V is the maximum usable (for high performance). >>>>>>>>>>>>> An input signal with limits of 0V and +0.3V with a trigger >>>>>>>>>>>>> threshold of 0.15V is the minimum usable (for high performance). >>>>>>>>>>>>> >>>>>>>>>>>>> For the 5370A attenuating the 5V CMOS signal to a 2V swing with >>>>>>>>>>>>> the threshold set to 1V is close to optimum. >>>>>>>>>>>>> An input signal with limits of 0V and +3.5V with a trigger >>>>>>>>>>>>> threshold of 0.7V is the maximum usable (for high performance). >>>>>>>>>>>>> An input signal with limits of 0V and +0.3V with a trigger >>>>>>>>>>>>> threshold of 0.15V is the minimum usable (for high performance). >>>>>>>>>>>>> >>>>>>>>>>>>> Bruce >>>>>>>>>>>>> >>>>>>>>>>>>> <5370ATriggering.png><5370BTriggering.png>_______________________________________________ >>>>>>>>>>>>> time-nuts mailing list -- time-nuts@febo.com >>>>>>>>>>>>> To unsubscribe, go to >>>>>>>>>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>>>>>>>>> and follow the instructions there. >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>> _______________________________________________ >>>>>>>>>>>> time-nuts mailing list -- time-nuts@febo.com >>>>>>>>>>>> To unsubscribe, go to >>>>>>>>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>>>>>>>> and follow the instructions there. >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>> _______________________________________________ >>>>>>>>>>> time-nuts mailing list -- time-nuts@febo.com >>>>>>>>>>> To unsubscribe, go to >>>>>>>>>>> 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https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>>>> and follow the instructions there. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> _______________________________________________ >>>>>>> time-nuts mailing list -- time-nuts@febo.com >>>>>>> To unsubscribe, go to >>>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>>> and follow the instructions there. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>> _______________________________________________ >>>>>> time-nuts mailing list -- time-nuts@febo.com >>>>>> To unsubscribe, go to >>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>>> and follow the instructions there. >>>>>> >>>>>> >>>>>> >>>>>> >>>>> >>>>> _______________________________________________ >>>>> time-nuts mailing list -- time-nuts@febo.com >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>>> >>>>> >>>>> >>>> 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