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

[Chris Albertson]

I use one just like auction #180518378555.   It is "only" 26dB but the
thing is very reliable.  It is a helix antenna inside and the mounting
holes on the bottom line up with a standard iron pipe flange so
mounting is easy.  I filled the flang flat them glued autommotive type
gaskit mmaterial to the pipe flange and attached the antenna with four
stainless steel machine screws.   The "N" type connector makes it
waterproof,   The rg-8 style cable is totally inside either the iron
pipe or metal conduit so it should last forever.

One idea:  Possible the ultra-high gain antenna is over loading the
GPS receiver.  50dB is very high

Another idea:  If you want gain buy an in-line ampler of the type made
for satelite TV dishes.  The specs are "close enough" that it will
work and they are inexpensive.

On Mon, Jul 30, 2012 at 8:41 AM, Chuck Harris <cfharris at erols.com> wrote:
> On a window sill, my Motorola hockey pucks will get a useable satellite
> every few minutes, for a few minutes.  If the antenna is out in the yard,
> it does much better, but all satellite signals are really low.
> The system would like another 10 or 20db of gain... which is what the
> Trimble bullet antenna would provide if it worked.  The 50db Micro Pulse
> antena should have been ideal... if it worked.... Sigh!
>
> -Chuck Harris
>
>
> Hal Murray wrote:
>>
>>
>> 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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-- 

Chris Albertson
Redondo Beach, California