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

Magnus Danielson magnus at rubidium.dyndns.org
Tue Jan 10 03:38:25 UTC 2012


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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