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Page 29FM-4000
10.14 PA/FOG OPERATION
The FM-4000 has a 30W Hailer that can be used with any 4 Ohm PA horn.
When in the Hail mode, the PA speaker listens back (acts as a microphone
and sends sound to the front panel speaker and the speaker MIC) through the
PA horn speaker which provides two-way communications through the PA horn
speaker.
NOTE
Before entering the PA or Fog mode, the FM-4000 receives on the last-
selected VHF channel to receive DSC calls.
NOTE
In some areas powerful AM broadcast stations may be heard when in
the listen-back mode. In this case change the speaker wire to 2-con-
ductor shielded audio cable. See section “8.5 ACCESSORY CABLE.”
PA Hail mode:
PA Hail mode allows the transceiver to be used as a power hailer when a
HAIL/PA speaker is installed. The PA Hail mode has a listen-back feature
which provides two-way communication through the HAIL/PA speaker.
Fog Horn mode:
Automatic signaling is transmitted through the HAIL/PA speaker. When the
Fog Horn, Bells or Whistle signal is not being outputted, the FM-4000 lis-
tens back through the connected PA Horn speaker.
10.14.1 Operating the PA Hail mode
1. Press the
[
F
]
key followed by the
[
2
(
MEM
)]
key to
activate the PA Hail mode.
2. Press the PTT switch to speak through the HAIL/PA
speaker.
Rotate the CHANNEL selector knob to control the
AF output level. The AF output level can be set from
0 to 30 watts.
3. When the fog signal is not outputted, rotate the VOL
knob to adjust the listen-back volume.
4. To exit the PA Hail mode, press the
[
CLR
]
key.