Rain Bird Gold LINK 900, Руководство пользователя, Страница: 8 / 35

7
September 2015
e) Adapters:
In some cases, adapters may be required to accommodate the different antenna and cable
terminations used. However, the use of adapters should be minimized, as each adapter causes a
signal loss of ~0.25dB. Rain Bird recommends using cables made with the proper connector
types to minimize the use of adapters. The LINK900 radio is terminated with an SMA Female
connector and requires an SMA Male cable end connection. The Standalone Repeater is
terminated with a TNC Female connector and requires a TNC Male cable end connection. Here
are some adapter examples
e) Surge Protection:
Surge protection should be used on all external antenna installations such as at the MIM-LINK /
TWI-LINK central control interface. There is no need for surge protection at a field controller
location if the standard antenna included in the Rain Bird
®
LINK900 radio/modem/antenna kits
(H49008 & H49004) is used. Where used, the surge protection MUST be rated for 900MHz
operation and MUST be grounded with a bare copper wire and a ground rod or plate. Rain Bird
recommends the Rain Bird
®
Polyphaser (HA1100) for surge protection of external antenna
installations in LINK900 systems.
Adapter, TNC Male to N-Female
Barrel Adapter, N-Female to N-Female
Rain Bird
®
Polyphaser (HA1100)
N-Female by N-Female
Two Polyphaser setup with proper grounding