[time-nuts] HP105B Help

[Bob kb8tq]

Hi

If the inside of the 105 went under water long enough to rust out a lot
of parts on the boards, it’s a good bet that the 10811 in the unit got
hit pretty hard as well. 

Simple answer: Spend $40 on an eBay replacement for the 10811. 
It should just plug in ….

Bob

> On Dec 13, 2020, at 5:15 PM, Dave Miller <ve7hr at ve7hr.ca> wrote:
> 
> I am in the middle of resurrecting a HP105B, It is one of the later models
> with an 10811 in.
> 
> I have fixed the obvious issues like the electrolytics that were missing
> and other parts that had leads evaporated due to corrosion.
> 
> The basics seem to work, A not bad looking sine wave etc.
> But the ADEV numbers are terrible.
> I am going back to make sure it's not a measurement setup issue. That is
> good. Just tested another OCXO and the test setup is good.
> Attached in a link to a .tim file
> https://www.dropbox.com/s/zebwiqy913v7k0k/HP105B%20test.tim?dl=0
> I am hoping one of the more knowledgeable folks might suggest where to
> start looking.
> I have checked all the other electrolytics and the ESR and capacitance
> looks good. I think the power supply seemed clean.
> 
> I have taken out the easy to get boards and cleaned card edges etc but this
> persists.
> 
> The saw tooth on the original phase is yelling something at me but I
> don't have a clue.
> 
> Thanks
> Dave
> 
> -- 
> 72 de Dave
> VE7HR
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