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

[Erno Peres]

Chuck,

I have seen already intermittent antenna receptacle on the
 back of the TB, also chk all coax connectors for solid contact.

Rgds Ernie.





-----Original Message-----
From: Chuck Harris <cfharris at erols.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Mon, Jul 30, 2012 9:52 pm
Subject: Re: [time-nuts] Active antennas for a Thunderbolt...


Hi Warren,
I am not battling weak signals, I am battling no signals from
wo 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, 
ven
 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 
sing a
 minimum of three satellites.
 If the TB ever does goes into holdover, that should be fixed, because that 
ill 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  
ower
 the TBolts AMU setting.
 It is better to set the AMU too low which will allow it to use weak signals 
ll 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 
inds
 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.


 _______________________________________________
 time-nuts mailing list -- time-nuts at febo.com
 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
 and follow the instructions there.

_______________________________________________
ime-nuts mailing list -- time-nuts at febo.com
o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
nd follow the instructions there.