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
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.
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.