Both of the thunderbolts I have usually see 7-8 satellites, SNRs from 35-50,
antenna is on the roof with about 150ft of LMR-400 and going through 2 4-port
distribution splitter/amps. I use the belden equiv of LMR-195 for all
connections between the receivers and the amps. Both thunderbolts seem to
compare well to the M12+ based Fury, and do usually better than the 6-channel
VP z3801a.
Scott
Mark Sims wrote:
> The Thunderbolt does not seem to be the most sensitive receiver around, but
> it does not seem particularly bad. Sensitivity in a time receiver can be a
> bad thing... more sensitivity tends to make it more susceptible to
> multipath, etc. These things were meant to be mounted on cell towers, etc
> where they have a pretty clear view of the sky. Once you have that, you
> don't need high sensitivity. Also their proximity to high power RF
> transmitters makes overly sensitive front ends a problem.
>
> On the subject of GPS amplifiers... adding external amplification to a GPS
> may not improve its performance and can actually degrade it. All amplifiers
> amplify signal and noise, plus distort everything in the process.
> (fundamental laws of the universe: 1) You can't get something for nothing,
> 2) You can't break even, 3) You'll die trying) Ideally, you want the
> amplifier at the antenna and you want the amplification to match the cable
> loss and no more. Generally GPS receivers with poor sensitivity have poorly
> designed front ends or signal processing. Yelling in their ears won't make
> them work any better.
> ----------------------------------------
>
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