Hi Let it run for a couple of days. If it's still up at > 11V, I'd tweak it down a bit.
Bob On Feb 9, 2013, at 12:38 PM, Garren Davis <garren.da...@qlogic.com> wrote: > Found my problem with the FRK. R31 on the Osc board was burned and open. This > was caused by a shorted C16. Replaced and it is now locked. The lock voltage > is 12.7v. Is this good or should it be lower? > > Garren > > > > > On Feb 9, 2013, at 6:10 AM, "Bob Camp" <li...@rtty.us> wrote: > >> Hi >> >> How old is the FRK? Does it look like it's been run without a heat sink for >> very long? They tend to get flaky if run for a while (many months) without >> heat sinking. There's nothing mysterious about it. The MTBF of the parts >> gets noticeably worse as the unit heats up. >> >> Bob >> >> On Feb 9, 2013, at 1:09 AM, Garren Davis <garren.da...@qlogic.com> wrote: >> >>> >>> Well for some reason the 10 Mhz stopped working on the FRK. Don't know why. >>> Started up the thunderbolt. It acquired satellites but then the DAC voltage >>> went to -5 volts. It's been there for an hour. Will this change after the >>> unit stabilizes? Going to bed. Will check it tomorrow. >>> >>> Garren >>> >>> >>> >>> >>> On Feb 8, 2013, at 8:25 PM, "Ed Palmer" <ed_pal...@sasktel.net> wrote: >>> >>>> Hi Garren, >>>> >>>> I suggest that you get the Thunderbolt working first. Without a known 10 >>>> MHz source to compare to, you're flying blind. Once the Tbolt is running, >>>> you should be able to check the frequency of the FRK by feeding both into >>>> your scope. Trigger on the Tbolt and watch what the FRK does. You should >>>> see the trace scrolling in one direction, then slow down, then stop, then >>>> scroll the other direction. The 'stop' point is at 10 MHz. The frequency >>>> sweeps a total of 20-30 Hz so it's easy to see. If you don't see the >>>> 'stop' point, the FRK isn't getting to 10 MHz. Now use the best frequency >>>> counter you've got to measure the Tbolt. Regardless of the calibration of >>>> your counter, the number your counter gives you becomes your 'new' 10 MHz. >>>> Now measure the FRK to see if it's running fast or slow. >>>> >>>> You should check the temperature of the lamp. It's easy to get at by >>>> removing the cover in the center of the heat sink. Probably best to >>>> remove the cover and then power down before you go poking around inside! >>>> The temperature of the cavity is also important, but getting to it is more >>>> of a hassle - don't go there if you don't have to. >>>> >>>> Of course, check for the normal things like internal power supply >>>> voltages, ripple, current drain (both initial and steady-state), etc. >>>> >>>> Regarding your second message, yes, the adjustment under the heat sink >>>> near the edge is the C-field. That won't help you at this point. The >>>> adjustment in the center of one side is the VCO. You could try adjusting >>>> it, but like I said, you're flying blind at this point. You won't know if >>>> you're adjusting closer to 10 MHz or further away. >>>> >>>> Good luck, >>>> >>>> Ed >>>> >>>> >>>> On 2/8/2013 6:12 PM, Garren Davis wrote: >>>>> Been lurking on the list for a while and finally started playing with a >>>>> FRK-L rubidium frequency standard. I've had this thing for a while and >>>>> decided to power it up and see what it would do. I do not get a lock. >>>>> What I see is the lamp voltage at 8.54 volts which I think is good but >>>>> the xtal control voltage swings from 2 volts to 15 volts and back to 2 >>>>> volts and keeps cycling like that. I don't have a good frequency counter >>>>> but I have a 3 Ghz 40 G/sample scope and it shows that the 10 MHz signal >>>>> is there. I just don't know how accurate it is. Has anyone seen a problem >>>>> like this? Can anyone point me to a place to start debugging this? I have >>>>> the schematics and test tools. I am a test engineer so I'm not afraid to >>>>> poke around in the guts of this thing. Hopefully I can get this thing >>>>> running. I also have a thunderbolt that I'll get running this weekend. I >>>>> don't know how deep I'll get into this time-nuts thing but I have this >>>>> nice scope and a Wavecrest sitting in my garage > a >> n >>> d >>>> I'd lik >>>> e to put them to use. Any help would be appreciated. >>>>> >>>>> Garren >>>> >>>> _______________________________________________ >>>> 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. >>>> >>> >>> ________________________________ >>> >>> This message and any attached documents contain information from QLogic >>> Corporation or its wholly-owned subsidiaries that may be confidential. If >>> you are not the intended recipient, you may not read, copy, distribute, or >>> use this information. If you have received this transmission in error, >>> please notify the sender immediately by reply e-mail and then delete this >>> message. >>> >>> _______________________________________________ >>> 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. >> > > ________________________________ > > This message and any attached documents contain information from QLogic > Corporation or its wholly-owned subsidiaries that may be confidential. If you > are not the intended recipient, you may not read, copy, distribute, or use > this information. If you have received this transmission in error, please > notify the sender immediately by reply e-mail and then delete this message. > > _______________________________________________ > 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.
