[time-nuts] Re: James Miller/Brooks Shera 10 MHz GPSDO

[Dan Kemppainen]

Hmmm, What is the temperature coefficient of coin cells?
At one point I hooked a AA battery to high resolution voltage data 
logger. The AA battery made a pretty good thermometer.

Maybe the temperature coefficient of the battery combined with the low 
EFC sensitivity wouldn't matter. Personally, I'd be concerned adding 
anything else to the system that could tune the crystal frequency.

Dan


On 8/31/2022 3:31 AM, time-nuts-request at lists.febo.com wrote:
> Pretty clever approach to establishing an offset. But doesn't it matter how
> the vari-cap is hooked up in the oscillator circuit? If the veri-cap needs
> a negative voltage to work that may indicate the cathode is at ground and
> the positive voltage would forward bias the vari-cap. Just thinking about
> the possible impact.
> Though the cost of experimenting is $0. No harm.
> Regards
> Paul
> WB8TSL
> 
> On Tue, Aug 30, 2022 at 1:22 AM Mervyn Thomas via time-nuts <
> time-nuts at lists.febo.com> wrote:
> 
>> Stephen,
>>
>> An idea I may try -thanks for your response.  The current involved in
>> the EFC line to the oscillator is extremely small-button cells would
>> last years.
>>
>> Merv
>>
>> On 29/08/2022 8:42 pm, Stephen C. Menasian via time-nuts wrote:
>>> Merv,
>>>
>>> If I understand your problem, the 10811's VCO control input voltage has
>>> drifted above the output range of the GPSD driver board. If the VCO
>>> control terminal current is low enough, you might be able to quickly
>> solve
>>> this problem by putting 1 or 2 Lithium Ion Coin cells in series with the
>>> control lead. If only a few microamperes are involved, this solutin might
>>> last several years.
>>>
>>> Stephen Menasian
>>>
>>> On Mon, 29 Aug 2022 15:56:52 +0800
>>> Mervyn Thomas via time-nuts<time-nuts at lists.febo.com>  wrote:
>>>