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APMxxxx Series User's Manual
OPTIONAL METHOD:
If the BTx power level is accurately known, simply enter it for each channel and then click the "Apply" button to save all values.
The combiner insertion loss is calculated by subtracting the measured forward power at the APM coupler from the value
assigned in the "BTx Pwr" field. A table of watts vs dBm is shown below for reference:
TX
POWER
(WATTS)
10
15
20
25
30
35
VSWR CALIBRATION:
Confirm that the coupler, for UHF and 700/800 MHz, is the latest model. The latest models will have the "FWD" and "REV" Type
N connectors at either end of the coupler, next to the DIN connectors. For reference, here are photos of both types of couplers:
For reference, the following photos show the physical difference between the two types of couplers:
"Legacy" Bi-Directional Coupler (VHF shown, legacy UHF/700/800/900 MHz models are similar in appearance but shorter)
The legacy couplers are readily identifiable as they have the "FWD" and "REV" ports (Type N connectors) along the bottom edge.
The bi-directional couplers have those ports on the ends of the coupler along with the 7/16 DIN connectors.
Note:
If your couplers are VHF, legacy UHF or legacy 700/800 MHz, perform the VSWR Calibration described on the
following pages, otherwise proceed to the Calibration Confirmation section
TX
TX
POWER
POWER
(dBm)
(WATTS)
40.0
40
41.8
45
43.0
50
44.0
55
44.8
60
45.4
65
Current Dual-Directional Coupler (UHF, 700/800/900 MHz only)
Asia Pacific | EMEA | Americas
TX
TX
POWER
POWER
(dBm)
(WATTS)
46.0
70
46.5
75
47.0
80
47.4
85
47.8
90
48.1
95
100
TX
POWER
(dBm)
48.5
48.8
49.0
49.3
49.5
49.8
50.0
133
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