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

Didier Juges shalimr9 at gmail.com
Tue Jul 31 00:29:15 UTC 2012


HP58532A

The manual is on my web site 
Www. KO4BB.com/Manuals 

The Bullet antenna specs are also on my site. 

Didier


Didier

Steve <steve65 at suddenlink.net> wrote:

>Didier,
>
>What is the model number of the Symmetricom antenna? Do you happen to 
>know the difference in gain between it and the Trimble Bullet antenna?
>
>Steve K8JQ
>
>On 7/30/2012 2:46 PM, Didier Juges wrote:
>> Chuck,
>>
>> I have one of the original red box TB.  It came with the Trimble
>Bullet antenna that is specified in the TB datasheet.
>>
>> The antenna works but gives extremely poor results.  The TB works
>much better with the Symmetricom antenna that is sometimes available on
>eBay.
>>
>> The Bullet antenna is usable with other GPS receivers,  so I know it
>is not bad.  Its just a poor match for the TB.
>>
>> Didier KO4BB
>>
>>
>> Chuck Harris <cfharris at erols.com> wrote:
>>
>>> Ok, I'm getting a little puzzled.  I have a TB that came from one of
>>> the early groups sold by John Ackermann and TVB as part of the TAPR
>>> buy.
>>> It works nicely, but like all TB's, it is deaf as a post, and needs
>a
>>> high gain antenna.... When I first got the TB, I tried it with a
>>> Motorola
>>> hockey puck antenna, with about 17db gain, and if it is outside in
>the
>>> clear, it works nicely... but LH shows the satellites signals are
>all
>>> down in the mud.
>>>
>>> ...So...
>>>
>>> I bought the active antenna that the TB data sheet said belonged
>with
>>> the TB, a 24045-10 bullet antenna, and *NO* satellites are visible..
>>> the antenna is dead.
>>>
>>> I'm no stranger to getting cheated on things I buy, so I chalked it
>up
>>> to bad luck, and put my Motorola hockey puck antenna back on my TB.
>>>
>>> ...Then....
>>>
>>> A couple of days ago another active antenna became available, a
>>> Micro Pulse 1934NW/C 50db antenna from a DATUM INC GPSDO.  I checked
>>> its data sheet, and it powers off of +5V @ 38ma, so I bought it,
>>> hooked it up to my TB, and again *NO* satellites are visible... the
>>> antenna is dead.
>>>
>>> I put a "T" in the line, and the voltage heading up to the antenna
>is
>>> around +4.5V... The spec sheet says it will work down to +3V.
>>>
>>> Am I doing something wrong here?  Or am I just unlucky?
>>>
>>> -Chuck Harris
>>>
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>
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