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 <[email protected]> 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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