Setting Attenuation Levels - Emerson Fisher FLOBOSS 407 Instruction Manual

FloBoss 407 Instruction Manual
Table 4-2. Jumper Positions for the Leased-Line and Radio Modem Cards
MODE
2-Wire
4-Wire
NOTE: Jumper P6 on the Radio Modem Card is used to either ground (factory default) or isolate the push-to-
talk (PTT) return line.

4.3.3 Setting Attenuation Levels

For the leased-line and radio modem cards, the output level is set at the factory to 0 dB. This level can
be reduced, as necessary, to better match the modem output to the line or radio. The adjustment is
made by plugging a resistor into the card at the location labeled R2. Table 4-3 lists resistor values and
the amount of attenuation they provide.
Table 4-3. Leased-Line and Radio Modem Card Attenuation Levels
ATTENUATION
(dB)
-2
-4
-6
-8
-10
NOTES: 1. All resistor values are nominal; 1% 1/4W resistors are acceptable.
2. Attenuation for leased or private-line operation or for a GE MCS radio is normally 0 dB;
in this case, no resistor is needed.
3. Attenuation for a GE TMX radio is typically -20 dB.
4. Attenuation for an MDS radio is typically -10 dB.
4-10
JUMPER POSITION
P3
2W
4W
R2 VALUE
(Ohms)
205 K
82.5 K
47.5 K
30.9 K
21.5 K
P4
2W
4W
ATTENUATION
(dB)
-12
-14
-16
-18
-20
P5
2W
4W
R2 VALUE
(Ohms)
15.8 K
11.5 K
8.66 K
6.65 K
5.11 K
Rev 5/00