[time-nuts] Lady Heather numbers

[Peter Gottlieb]

The antenna has a pretty clear sky view right now.  I have about 75 feet of 
cable, 25 feet that came attached permanently to the antenna, might be RG-59, 
and a 50 foot extension which is a new piece of good quality RG-6 CATV cable.

Perhaps the antenna (came with the tbolt in the ebay deal) is not that good and 
I should get something better before taking the effort to get it up in its 
permanent location?



On 3/2/2013 10:06 PM, Bob Camp wrote:
> 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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