[time-nuts] Active antennas for a Thunderbolt...

Chuck Harris cfharris at erols.com
Mon Jul 30 19:52:17 UTC 2012


Hi Warren,

I am not battling weak signals, I am battling no signals from
two mushroom type antennas.

-Chuck Harris

WarrenS wrote:
>
> Have you used Lady Heather to automatically set the Default settings?
>
> 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
>
> ******************
> cfharris at erols.com said:
>>> I suspect that I have just had the bad luck to buy two bad antennas, but I
>>> am naturally curious what happens when the sample set gets larger.
>
>> I have 2 TBolts using the small Motorola antenna from TAPR in a not-good
>> location.  The sheet says 24 dB of gain.  I have 6 or 9 or ?? feet of RG-6.
>
>> They work as expected, that is they work, but not well.  The holdover logic
>> gets tested frequently and surveys take a long time.  But they do work.
>
>
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