Hi I think the truth of the matter is that these gizmos have been cheap enough (and complicated enough) that they don't get repaired a lot. Certainly the VCXO gets tweaked, and there are a couple of caps that explode / get replaced. Past that either they don't break, or they get replaced.
Bob On Feb 18, 2013, at 1:52 AM, Magnus Danielson <mag...@rubidium.dyndns.org> wrote: > On 02/18/2013 04:34 AM, Bob Camp wrote: >> Hi >> >> There *must* be an alignment procedure that sets these things up. They >> didn't put all those test points in there just for the fun of it. I'm sure >> that these units would work a bit better if we knew how to tweak them back >> to the original alignment specs. > > There is a document which gives some of it, but doing a reverse-engineering > project is primarily so it can be properly understood for trimming and repair > purposes in my mind. > > There is a 2x4 connectors which can connect in a test-rig while the 2x5 > connector is hooked up. There is two different connectors inside that also > should be relevant, and then is at least one jumper field which would be good > to know how it "works". > > Considering how common these are, I was surprised that more effort had not > gone into them, compared to how the group (and hams) tend to deal with all > this. > > Cheers, > Magnus > >> Bob >> >> On Feb 16, 2013, at 6:10 PM, Magnus Danielson<mag...@rubidium.dyndns.org> >> wrote: >> >>> Fellow time-nuts, >>> >>> Considering that LPROs is pretty popular, I am a bit surprised that I have >>> not seen any major reverse-engineering effort on the LPROs. I have the >>> self-compiled LPRO service document, which collects parts of schematics >>> from patents, but still. >>> >>> My main reasons for asking is that I want to get a little better overview >>> of how they work, how I can tune them up and what signals is available >>> where. Naturally, always figuring if there is some interesting tweaks to be >>> done. >>> >>> LRPO is just a traditional analogue rubidium, in compact format, sure, but >>> never the less. >>> >>> I have noticed that different FPGAs have been used over time. Curious about >>> the various jumpers and connectors in it. >>> >>> Cheers, >>> Magnus >>> _______________________________________________ >>> 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. _______________________________________________ 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.
