[time-nuts] Re: What phase variations to expect in a DMTD due to temperature fluctuations?

[Bob kb8tq]

Hi

A beach towel tossed over the device may improve things quite a bit.
Next step up from that would be a die cast metal enclosure. They are
pretty cheap from a number of sources, Hammond is one, but there are
others. 

Bob



> On Oct 28, 2022, at 8:49 AM, Erik Kaashoek via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hi John,
> Thanks for the practical advice and the measurements.
> After ironing out some problems the measurement noise with two equal inputs and a tau of 0.1 s is now below 100 fs.
> Long term phase stability has also improved and typical slow phase variations over an hour, when measured on a desktop in a room with people, are now within 4 ps
> The next step may be to replace the current plastic enclosure with a decommissioned fridge, but that would defeat the idea of having a small battery powered portable device.
> Erik.
> 
> On 24-10-2022 21:49, John Miles via time-nuts wrote:
> 
>>   You should see similar sub-picosecond drift figures from your own
>> DMTD, given similar conditions.  If not, there will be a reason, one that is
>> probably not too hard to address.
>> 
>>  
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