[time-nuts] Noisy Sulzer 2.5 - Suggestions?
ed_palmer at sasktel.net
Wed Aug 17 23:10:02 EDT 2016
I was expecting, and I'm seeing, improvements at high values of tau
(i.e. aging) as time passes, but I've never noticed an improvement at
low tau on any of my oscillators. Probably because my measuring
equipment isn't good enough to see it! I'll watch for that in the future.
On 2016-08-17 7:03 PM, Bob Camp <kb8tq at n1k.org> wrote:
> Let it run for a month before you worry much about measuring what it is doing ….
> Some (but not all) of those old crystals took a while to settle in.
>> >On Aug 17, 2016, at 4:25 PM, Ed Palmer<ed_palmer at sasktel.net> wrote:
>> >I picked up a Sulzer 2.5 (not 2.5A or 2.5B or 2.5C) oscillator and 5P power supply. It's working, but the AlDev at low tau is poor. After a few days of operation the AlDev @ 1sec. is only 1e-10. It's not the power supply. I'm running under 'AC fail' conditions with a lab power supply standing in for the batteries. This bypasses almost everything in the power supply. Eventually, I plan to replace the batteries with lead-acid and replace the circuit board with an improved circuit.
>> >So, I'll be opening up the oscillator to see what's what. My first 'usual suspect' will be the Ta capacitors, but I'm wondering about all those carbon composition resistors. Should I be looking at a wholesale replacement with metal film? Maybe just in the oscillator and AVC areas? Are there any other known trouble spots with these oscillators?
>> >I haven't been able to find any info on the 2.5. The manuals and schematics for the 5A and the 2.5B/C are some help, but the 2.5 is very different from the 2.5B/C. Any info would be greatly appreciated.
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