EFJohnson 989X SERIES User Manual

2-7

February 2001

Part No. 001-9800-001

Strain Relief

Accessory

J301

J701

Two User-Definable Wires

Pigtail Cable

Data Pigtail Cable

installed. Then install the mounting bracket using 
the included self-tapping screws or other screws if 
desired.

2. Install the control unit in the bracket using the 

included knobs and vulcanized washers (the 
washers are installed between the bracket and 
control unit).

3. Install the included microphone hanger in a conve-

nient location using the included sheet metal screws 
or other screws. For proper operation of functions 
such as the monitor mode and scan, the hanger must 
be connected to chassis ground. If required, ground 
the hanger using the included ground wire.

Power output with the internal 8-ohm speaker in 

the front panel or remote control unit is approximately 
3 watts. For up to 5 watts of power, a 4.7-ohm external 
speaker can be used. This speaker is plugged into the 
external speaker jack on the back of the transceiver. 
This is a standard 1/8”, two-conductor phone jack. The 

internal speaker is automatically disabled when an 
external speaker is used. 

The impedance of the external speaker must not 

be less than 4.0 ohms. Using a speaker with an imped-
ance less than 4.0 ohms could result in audio ampli-
fier U306 overheating and does not provide 5 watts of 
power. Therefore, to allow for tolerances, a speaker 
with a nominal impedance of 4.7 ohms is recom-
mended. The E.F. Johnson remote speaker listed in 
Figure 2-1 or Table 1-3 meets this requirement. This 
speaker has a 6-ft cable, and in some applications 
(such as remote mounting) an extension cable may be 
required to connect it to the transceiver.