[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.




-- 
These are my opinions, not necessarily my employer's.  I hate spam.






More information about the time-nuts mailing list