[time-nuts] Some more info on the 5065A optical unit

Bob kb8tq kb8tq at n1k.org
Mon Nov 27 19:52:15 EST 2017


The gotcha with coating (at least with RF coils is that the adsorption / desorption process gets really 
crazy. You may slow the “going in” part down to a week. The “getting out” part may turn 
into (many) months. That’s what makes the “stored on a shelf and then turned on” thing
a mess. It takes a *long* time for things to stabilize. 

Again - this is all RF based. Some of what happens applies at DC. Some of what happens
simply does not matter at very low frequencies. 


> On Nov 27, 2017, at 6:41 PM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> However the dimensions of the coil former vary with moisture content.
> Impregnation with waxes and other organic materials merely serves to slow down the rate of absorption and doesn't prevent it.
> Bruce 
>> On 28 November 2017 at 12:36 Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
>> --------
>> In message <2B66D682-15CF-465F-9A34-D7F7E7929ED8 at n1k.org>, Bob kb8tq writes:
>>> Straight cardboard *is* an issue on RF coils in humidity.
>> The C-field coil is DC only.
>> -- 
>> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
>> phk at FreeBSD.ORG         | TCP/IP since RFC 956
>> FreeBSD committer       | BSD since 4.3-tahoe    
>> Never attribute to malice what can adequately be explained by incompetence.
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