Antenna cable

Q&A forumAntenna cable
remi.cormier8 asked 2 months ago

Hello,
I need a 30 m cable to connect the AMN-MB-00 antenna to the Ardusimple (used as a base).
What kind of cable should I use :

  • has any body experienced connecting the RG174 (SMA connector) antenna cable to a bigger cable ?
  • 50 Ohm or 75 ohom ?
  • ?

Any suggestion would be greatly apreciated

Ardusimple Staff replied 2 months ago

Hi Remi,
30m is too long for GPS signal, unless you use an GPS amplifier in the middle, like: https://www.navtechgps.com/departments/equipment/rf_networking/amplifiers/in_line_amplifier_l1l2_21db_la_21_l1l2_/ You might want to find an equivalent with SMA.

In general, 10meters (in addition to the 5m of the ANN-MB), is the maximum we would recommend. And you could already see a loss in performance.

Regarding your question, the lower loss the cable the better, and 50 ohm.

sjaak.aarnoutse replied 2 months ago

Connecting RG174 to a thicker cable can be done. I would solder the core, make sure you maintain perfect isolation and shielding. Crimp foil woild be the finishing touch.
You may want to check out H155 coax, see https://www.koax24.de/koaxialkabel/vergleich.html?tx_arnotecshop_cablecompare%5Baction%5D=index&tx_arnotecshop_cablecompare%5Bcontroller%5D=Cablecompare&cHash=eeab156c012e9ce10370c052aa615e0d
This cable has a much lower attenuation which will allow you to cover greater distances. It is also a lot less vulnerable.

1 Answers
remi.cormier8 answered 2 months ago

Thank’s for your answers.
I bought a “High Quality coaxial cable” 50 ohm, 10.3 mm in diameter with SMA with male and femelle connectors from https://www.antennes-wifi.com/cable-sma/cable-haute-qualite-sma-male-et-sma-male-diametre-10-30-mm-longueur-1-a-30-metres.html, 15 m in length.
It works perfectly
I did’nt noticed any attenuation : from u-center, satelites near zenith have à 50 dB SNR.