12/20/11 888-2595-001 A-11
WARNING: Disconnect primary power prior to servicing.
Appendix A - FM Web Remote Option
ZX Series
A.4 Theory of Operation
The FM Web Remote features a Microchip PIC18F97J60 microcontroller running a
modified version of the Microchip V4.02 TCP stack and a custom made application to
interface to the ZX series of transmitters. An on-board real time clock with 3V coin-
cell battery maintains the current time, even in the absence of AC mains power. An on-
board EEPROM maintains non-volatile storage of the transmitter log and various
configuration settings. An on-board RJ11 jack provides for in-circuit programming in
the factory. Should a software upgrade be required in the field, the preferred method is
to unplug the card from the I/O board and plug in a replacement board sent in advance
from the Harris factory. A small green LED at the lower edge of the card blinks once a
second when the web remote is operating correctly. This LED is not visible from
outside the amplifier chassis, but can be used to assess the functioning of the web
RF MUTE END External mute line opened again.
REVERSE
FOLDBACK
Transmitter output power was automatically reduced due to high reverse power
(VSWR) measured at output.
REVERSE
FOLDBACK OK
Reverse foldback condition cleared.
RESTARTS
EXCEEDED
Auto-restart circuit locked out due to multiple unsuccessful restart attempts.
EXCITER FAULT Exciter reported an internal fault or an exciter switchover occurred because of a
fault condition.
EXCITER OK Exciter fault condition cleared.
REMOTE
DISABLED
Amplifier chassis was placed in “local” REMOTE DISABLED mode via switch
on reverse side of front door controller board.
REMOTE ENABLED Amplifier chassis was returned to REMOTE ENABLED mode.
EXCITER B
SELECTED
Exciter main/alt switcher switched over to exciter A.
EXCITER A
SELECTED
Exciter main/alt switcher switched over to exciter B.
FM MODE
SELECTED
Transmitter was switched to FM mode by Flexstar exciter.
NOTE: When no Flexstar exciter is present, the transmitter is hard-wired perma-
nently into FM mode via shorted pins on the exciter interface cable.
FM+HD MODE
SELECTED
Transmitter was switched to FM+HD mode by Flexstar exciter.
HD MODE
SELECTED
The transmitter switched to HD mode by Flexstar exciter.
SL MODE
SELECTED
The transmitter switched to SL mode by Flexstar exciter.
Table A-2 List of transmitter log messages.
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