Ekomini 800 Mhz A Band Series; Figure 11: Cellular A Band Filter Switch Characteristics; Table 9: Cellular A Band Bandpass Filter Switch Positions - EMS EkoMini Operator's Manual

5.3.2 EkoMini 800 MHz A Band Series:

Switches 3 and 4 are used to minimize the gain of the control channels in the adjacent
Cellular B band by moving the position of the upper "skirt" of the repeater's bandpass
filter. Figure 11 illustrates this. The switches are set to position the 3-dB roll-off point
of the filter on specific AMPS channels as shown in Table 9 below. The units are
factory set with the filter centered at the center of the band, so channels at the extreme
lower and upper band edges are filtered out equally. If the switch settings are
changed, be sure to press the "reset" button to make these changes effective.

Table 9: Cellular A Band Bandpass Filter Switch Positions

Band
Selection for
"A" Band
A
1
A
2
A
3
A
4
0
-3 dB
-10
-20
-30
-40
879.0 879.1 879.2

Figure 11: Cellular A Band Filter Switch Characteristics

EMS Wireless EkoMini Manual
3-dB Roll-off Begins on
AMPS Channel
Channel 329 – 879.870 MHz
Channel 325 – 879.750 MHz
Channel 321 – 879.630 MHz
Channel 317 – 879.510 MHz
Switch
Position "A4"
Cellular
A Band (upper portion)
Ch. 317
(879.510
MHz)
879.3 879.4 879.5 879.6 879.7 879.8 879.9 880.0 880.1
Frequency, MHz
34
Switch
Position
On
On
Off
Off
Switch Switch
Position "A3" Position "A2"
Ch. 321 Ch. 325 Ch. 329
(879.630 (879.750 (879.870
MHz) MHz) MHz)
Switch 4 Position
3
On
Off
On
Off
Switch
Position "A1"
Cellular
B Band (lower portion)
EMS Wireless