Everything I have seems to be pre 2005 of the units I am thinking of. They are 1998 region. Best regards Bob. Paul
On Mon, Aug 12, 2013 at 8:07 PM, Bob Camp <[email protected]> wrote: > Hi > > They made a change on the Efratom Rb's some time around 2005 that boosted > the "normal" lamp voltage by about 3 volts. Without tracing out the > circuit(s) there's no way know if they just bumped the bias voltage up or > what they did. An "old" lamp voltage unit probably is ok to 4 volts or so. > I'm not sure if the same is true of the newer "9 volt" units. > > Bob > > On Aug 12, 2013, at 6:52 PM, paul swed <[email protected]> wrote: > > > From those voltages I speculate a long life. In the various RBs I have > > 2-3.5 V seems to be trouble. > > Every units a bit different. When the units gets very old you will see > the > > lamp re-ignite. Generally this will be noticed as a significant random > > phase jump. If you have a lock light it will go out for 30-60 or so > seconds > > until the system comes back on. > > When I get an old rb I attach a cheap digital pedometer with an opto > > coupler etc (Could be a FET or transistor just as easily) to the lock > > signal. It increments every time the system unlocks. Humorously I call > it a > > loc-O-meter. > > Regards > > Paul > > WB8TSL > > > > > > On Mon, Aug 12, 2013 at 5:55 PM, Bob Camp <[email protected]> wrote: > > > >> Hi > >> > >> On Aug 12, 2013, at 3:21 PM, Yuri Ostry <[email protected]> wrote: > >> > >>> Hello, > >>> > >>> Tuesday, July 30, 2013, 3:03:57, Bob Camp wrote: > >>> > >>>>> 3) what is the typical life of such a unit? > >>> > >>> B> If it's run without a heat sink, about two years. > >>> > >>> B> If it's power off on the shelf, many decades. > >>> > >>> There was another "aging factor" mentioned in some documents that > >>> circulate around the net. Helium can diffuse from atmosphere through > >>> glass walls ans change buffer gas composition inside the cells. > >> > >> From what I have seen of "stored" cells - it's not a major issue. > >> > >>> > >>> Run well cooled, >> 10 years for 90% of the units > >>> > >>> As I can see, my FRS-C still works well after approx 10 yrs on a cell > >>> site working 24/7 and 5 yrs sitting on the shelf. But lamp voltage > >>> that was recorded 5 yrs ago differs from the one that I measured > >>> when I put it back to work. It is lowered little bit. > >> > >> The key question is - was it powered up in the cell site or simply > sitting > >> powered down? A *lot* of the cell site Rb's were in "emergency backup" > >> applications (cell sites on trucks …). They sat around for 10 years, but > >> didn't run for very long at all. > >> > >> Bob > >> > >>> > >>> 73! > >>> Yuri > >>> UA3ATQ/KI7XJ > >>> -- > >>> Best regards, > >>> Yuri mailto:[email protected] > >>> > >>> > >>> _______________________________________________ > >>> 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. > > _______________________________________________ > 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.
