40 Aviat Networks
Chapter4. Eclipse Edge Configuration and Diagnostics
Coupler Losses
For hot-standby (single antenna operation), coupler losses must be manually
accounted for in the calculation of effective radiated power and of receive signal level
for fade margin purposes.
Two types of coupler are provided; an equal split coupler with insertion losses of
nominally 3.5 dB per side, and an unequal split coupler, which has a nominal split of
1.5 / 6.5 dB. Refer to Table 4-6, “Nominal Losses for Equal and Unequal Couplers,”
on page 40 for details of the losses by frequency band for the equal and unequal
options.
For the unequal split coupler, the low-loss side must be assigned to the primary
terminal. (The primary terminal must be connected to the primary arm of the
coupler).
The losses apply for Tx and Rx. For instance, if the primary side has an insertion loss
of 1.6 dB, then the total additional primary-primary path loss due to the coupler at
each end of the link will be 3.2 dB.
Table 4-6. Nominal Losses for Equal and Unequal Couplers
ATPC Guidelines
Automatic Transmit Power Control (ATPC) is an optional setting. It allows radio
links to maintain set thresholds for fade margin, and to maintain overall link
performance at an otherwise lower than maximum transmit power. If path
conditions deteriorate due to fading, ATPC gradually increases the transmitted
power to maintain the remote fade margin. When the condition causing the fade ens,
the TX power level is reduced back to the minimum level.
Refer to:
• Benefits of ATPC on page 41
Frequency
Bands GHz
Primary Arm
Insertion Loss dB
Secondary Arm
Insertion Loss dB
37.0 - 40.0 4.0 (Equal), 2.0
(Unequal)
4.0 (Equal), 7.0
(Unequal)
31.9 - 33.4
27.5 - 31.3
24.25 - 26.5
21.2 - 23.6
3.8 (Equal), 1.8
(Unequal)
3.8 (Equal), 6.8
(Unequal)
17.7 - 19.7
14.4 - 15.35
12.75 - 13.25
10.7 - 11.7
7.11 - 8.5
3.6 (Equal), 1.6
(Unequal)
3.6 (Equal), 6.6
(Unequal)
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