[time-nuts] Lady Heather numbers

Peter Gottlieb nerd at verizon.net
Tue Feb 26 19:36:52 EST 2013

How does one set the AMU value with LH?

On 2/26/2013 12:05 AM, Chuck Harris wrote:
> To quote WarrenS:
>> To allow the Tbolt to work with weak signals from any antenna that I've tried,
>> even when indoors, I start by setting the TBolt's AMU level from the default 
>> of 4
>> down to 0. This can be done with the Tbolt S/W or LH.
>> My general AMU setting goal is to make it low enough so that the TB is always
>> using a minimum of three satellites. If the TB ever does goes into holdover, 
>> that
>> should be fixed, because that will cause some serious freq offset noise at the
>> TBolt's output, The usual holdover fix is to give the antenna a better view 
>> of the
>> sky and/or  lower the TBolts AMU setting. It is better to set the AMU too low
>> which will allow it to use weak signals all the time than it is to set it too 
>> high
>> and have No signals even for a short time.
>> After lowering the AMU value, if you want to optimize the setting, LH has all
>> kinds of tools to help, such as the sat signal strength plot.
>> ws
> -Chuck Harris
> Garren Davis wrote:
>> The antenna has a pretty clear view of the sky. I notice that whenever a 
>> satellite
>> drops out it causes the oscillator white trace and the DAC green trace to jump
>> around. I wonder why that happens when there are 6 other good satellites.
>> I can go back in time by using the down arrow and I see that it was pretty 
>> steady
>> overnight until the furnace turned on to heat up the house. It's amazing how
>> sensitive it is.
>> Garren
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