[time-nuts] Lady Heather numbers

[Bob Camp]

Hi

As much as can be told from a 17 minute plot - looks ok. The antenna could indeed be a bit higher and that would hopefully take care of the crummy sat c/n numbers. What kind of feed line / antenna are you using? Cable TV RG-6 quad shield from your local big box store is a real good choice for the coax. RG-58/59 are not as good at this frequency. 

Bob

On Mar 2, 2013, at 9:52 PM, Peter Gottlieb <nerd at verizon.net> wrote:

> Typical, the image didn't go through.  Here is a link to it:
> http://petergottlieb.com/images/tbolt.gif
> 
> 
> On 3/2/2013 9:45 PM, Peter Gottlieb wrote:
>> I finally got the antenna outside, but just onto a deck railing and not yet up high on the roof.  Before I do that, does it look like I'm getting decent performance from it?  Here is the LH display:
>> 
>> Once up on the roof the Westerly exposure will be improved, but North East and South are pretty much clear right now.
>> 
>> Does anything else look suspicious or wrong?
>> 
>> Any hints greatly appreciated!
>> 
>> 
>> 
>> On 2/26/2013 1:53 PM, WarrenS wrote:
>>>> Can anyone comment on the picture.
>>>> I don't know if what I have would be considered good as far as accuracy and stability is concerned.
>>> 
>>> The screen dump is way too short to give much detail.
>>> What can be said from what is there:
>>>> From a Ham standpoint it is all working fine and is much better than 1e-9.
>>> 
>>>> From a time nut standpoint it is very poor.
>>> It is using the default setting (for the most part)
>>> Phase error at -100ns is ~50 times high for the 100 sec TC setting used, (likely due to the high drift rate of the Osc)
>>> Frequency error is wondering around 1e-10 is about 50 times higher than what is possible.
>>> Effect on freq and phase noise with sat changes is >>10 times more that what is possible with good setup.
>>> 
>>> Concerning your Dac comments, Yes makes sense, but your conclusing is wrong.
>>> Can't say or sure, because the 24 Hr + screen shot is not shown, but in general
>>> The Tbolt temperature reading has no direct effect on the Dac control voltage unless the Tbolt is in hold over.
>>> The Dac voltage changes because the oscillator's freq is trying to change, not the other way around.
>>> You can disable the Dac from changing with "dd".
>>> 
>>> ws
>>> 
>>> ********************
>>> From: "Garren Davis"
>>> Subject: [time-nuts] Lady Heather numbers
>>> 
>>> Hi,
>>> 
>>> I have been playing with my thunderbolt and Lady Heather over the weekend. I hope it's ok
>>> that I attached a screen dump of what I have. Can anyone comment on the picture. It's been
>>> running less than a day and I don't know if what I have would be considered good as far as
>>> accuracy and stability is concerned.
>>> Thanks.
>>> Garren
>>> 
>>> **************************
>>> Garren Davis garren.davis at qlogic.com
>>> 
>>>> From looking at the graph over 24 hours it looks like the outer oven varies about +-.5C. This is
>>> from the tbolt temperature sensor as the tbolt is in the outer oven. The inner oven where the
>>> oscillator is located holds at 66.4C. My concern is that it looks like the tbolt algorithm controls
>>> the DAC voltage depending on the temperature that the tbolt reads. Temperature goes up, the DAC
>>> voltage goes up. If the inner oven is holding steady then I don't want the DAC voltage changing
>>> if the temperature in the outer oven is changing. Is there any way to tell the tbolt algorithm to
>>> ignore the temperature in its DAC calculation?
>>> 
>>> Wow, I hope this makes sense the way I explained it.
>>> 
>>> Garren
>>> 
>>> 
>>> 
>>> 
>>> 888888888888888888888
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