BSS Audio FPC-800 User
Manual
Page 8 of 11
which is fed into the POH speaker system (or reference time zero system). If
this speaker system is also using one of the TCS-804 units within the
interconnected system, then ensure that it is set to channel 16.
Set the FPC-800 channel to that of the TCS-804 controlling the delay tower
being measured, and select MEASURE mode. There should not be any
appreciable background noise for the measure function to operate correctly, and
a 'Shh' message appearing at this time would indicate too much noise.
While standing at the delay tower position, press the DELAY button
corresponding to the delay which requires setting, and the measurement
process will begin. Note that if the TCS-804 is in a relative mode, such as in a
time-aligned system, the reference delay must be selected so that the delays
relative to it are adjusted by an equal amount. While the measurement is in
progress, as indicated by the 'BUSY' message, hold the FPC-800 still and
pointing at the main POH (or reference) stack, to which there must be an
unobstructed line-of-sight. The automatic process begins by muting all the
outputs of the TCS-804s, except that set to channel 16 which may be used for
FOH time alignment, The FPC-800 then instructs the last TCS-804 in the chain
to emit a tone from its’ FSK output, which is broadcast on the main POH stack.
The microphone in the FPC-8OO detects the onset of the tone and calculates
the time delay, and hence distance from the main POH stack to the FPC-800. A
second measurement is made, and if this agrees with the first, the distance is
shown on the FPC-800 display, and the delay value is sent to the appropriate
TCS-804, which then installs the new value. If the two measurements do not
agree the process is automatically repeated up to four more times until a steady
reading is obtained, otherwise 'Err 8' will indicate measurement failure. The
process is terminated by the mutes being restored to their original settings.
To achieve an accurate reading the signal received at the microphone should be
at a comfortable listening level, at least 6dB more than it takes to light the
RECEIVING indicator. In general, more accurate readings are obtained with
higher levels.
NOTE: To ease the setting up of this level, operation of the ON/CHECK
button forces the TCS-804 to emit the measurement tone at the same level
as is used during an actual measure sequence).
8 FM RADIO LINK
Since during use the FPC-800 is likely to be some distance from the TCS-804s,
it may not be practical to use a microphone cable for communication. In this
case a FM radio link may be used to relay the FS~ data to the TCS-804s. A
beltpack style guitar transmitter would be ideal and the receiver microphone
output is likely to carry the appropriate level for the TCS-804 FSK interface. The
