I'm selecting an outdoors antenna for a Jupiter Pico T Timing GPS
(TU36-D400-020) but don't clearly understand what "dB" rating of amplified
antenna to use. From web references, it looks like the degree of amplification
required is dependent on 1.) The length of run of coax lead-in, combined with
the characteristic loss of the type of coax used 2.) The amount of
amplification needed to increase the very weak GPS signal to the range the
receiver requires it. If I'm running 20 feet of RG-58, would a 26dB antenna be
sufficient?
The datasheet for the receiver family states, "1575.42 MHz at a level between
–115 dBm and –133 dBm into a 50 Ω impedance." So the receiver needs at max a
-115 dBm signal. The typical received signal power from a GPS satellite is
−127.5 dBm. So it looks like I need to amplify the RF signal for the GPS
receiver requirements + compensate for the high loss of the GHz signal
traveling through ordinary RG-58 coax. Am I on track, here? Recommendations?
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