[time-nuts] Trimble GPS antenna preamp, anyone know the gain?

[gary]

With that amount of gain, I would assume they don't have to be low 
noise, though they could be. That is, I assume they are designed for use 
with an amplified antenna. [The noise margin should be set by the 
antenna preamp, not an amp down stream.]

But then again, they would have to pass DC to the actual amplified 
antenna, as well as work as a 10dB amp.


On 1/9/2012 7:38 PM, Magnus Danielson wrote:
> On 01/10/2012 02:44 AM, Chris Albertson wrote:
>> I bought a pair of in-line Trimble amplifiers but I can't find any specs.
>> Anyone know the gain?
>>
>> They are in a machined stainless steel box with two "N" connectors.
>> Trimble sells them bundled with a long antenna cable so that the amp (I
>> assume) compensates for the cable loss. I opened one up. I'm very sure
>> they are preamps intented for being in the antenna feed line.
>>
>> I won these on ebay for $0.01 for the pair, $5.00 for shipping. The
>> seller
>> paid more than $5.01 for postage and lost money on the transaction. I
>> bought them because even if they were dead the cases are usfull. Now I
>> think I want to run one of them ahead of a passive splitter and have
>> multiple receivers on one antenna
>
> The 4000SSI manual says it gives 30 m additional cable-reach on RG-213
> and the L1 damping of RG-213 gives about 10 dB for 100 foot, so I'd
> guess you have a 10 dB amplification in them.
>
> Cheers,
> Magnus
>
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