Dekolink Deko3108S Product Manual page 26

P M
RODUCT ANUAL
3.7.2 Antenna Connections
Note 1: Do not operate the Repeater without terminating the antenna connections with
actual antennas or proper dummy loads.
Note 2: If the coaxial cables are NOT weather-resistant type, wrap the exterior coaxial
cables with insulation and holding tape (Type 3M Rubber splicing tape) for
environmental protection and to ensure longer lifetime.
To connect the antennas to the Repeater
• Connect the Donor antenna to the Repeater BASE port.
• Connect the Service antenna to the Repeater MOBILE port.
3.7.3 Verifying Isolation between Donor and Mobile Antennas
The isolation between the Base/Donor and Mobile/Service antennas is critical especially
for high gain, outdoor applications.
For proper operation of the Deko3108S iDEN midi-repeater, it is recommended that the
isolation between the Donor and Service antennas be at least 10 dB higher than the
Repeaters set gain.
Note: Lower isolation can lead to high in-band ripple, oscillations and low signal quality.
To measure the isolation, proceed as follows:
1. Inject a known signal from a signal generator into one antenna (preferably the
Donor antenna).
2. Measure the coupled output from the Service antenna, using the Spectrum analyzer
and LNA if applicable.
3. Perform this procedure across the frequency range of both the Uplink and Downlink
bands.
4. Register the lower result for system operation.
NOTE: The SLAC feature overcomes this procedure.
Page 24
C R D
OMPACT EPEATER
Figure 3-9. Deko3108S - Antenna Connections
Proprietary Data
3108S D
EKO EKOLINK
W L .
IRELESS TD
P/N 300XC10031 Rev. B