[time-nuts] Reverse-engineering LPRO
magnus at rubidium.dyndns.org
Mon Feb 18 01:52:45 EST 2013
On 02/18/2013 04:34 AM, Bob Camp wrote:
> 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.
> On Feb 16, 2013, at 6:10 PM, Magnus Danielson<magnus at 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.
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