[time-nuts] Trimble recommends RG-59 Antenna Cable.
Hal Murray
hmurray at megapathdsl.net
Mon Apr 30 06:41:19 UTC 2012
kenkubick at hotmail.com said:
> Hi Time-Nuts guys, I was reading the Trimble Thunderbolt manual section
> 2.1.3 (Antenna Cable). Trimble recommends using RG-59 cable which is 75 ohm
> coax. Is this a typo or is this correct? I thought that the Trimble
> Thunderbolt would use a 50 ohm cable and antenna.
The key idea is that the loss/foot of RG-59 at GPS/L1 frequency is lower than
RG-58.
There is a cross over point on the length of the run where the loss in the
coax is more important than the loss due to the impedance mismatch.
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