Broadcast Electronics 3000 Series - Delay Option

Equipped record models can both playback and record the auxiliary
cue tones. The tones are recorded by pressing the appropriate front panel
switch
(SEC 150Hz or TER 8 kHz). As long as the switch is depressed, the
tone will
be recorded on the cartridge. To insure positive operation in
playback, NAB standards call for a minimum burst of 100 (at 150 Hz) or 2 (at
8 kHz) milliseconds duration. The exact positioning of the tone and its
duration depends upon the requirements in the individual installation. When
recording the 150 Hz (QI) tone to provide automatic fast forward, the tone
must not end before the program material ends.
3-4.
DELAY OPTION
To provide the delay function, an erase/record head is physically
substituted in place of the record head. The positions of the reproduct and
record heads are transposed. As the program material is recorded, the tape
passes through the
cartridge, and is played back by the reproduce head.
Hence, the reproduced output lags behind the input
by the length of the tape
in the
cartridge used.
Since precise timing is usually desirable, the following table
lists various lengths of seconds and the equivalent lengths in inches of
tape
at 7.5 ips (for 3.75 ips divide the inches equivalent by 2). Allow an
additional 2 to 3 inches for the splice. Make the splice as clean as possible.
Any gap or overlapping in the splice will be noticed as the splice passes
over the reproduce head.
SECONDS
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
INCHES
37.5
45.0
52.5
60.0
67.5
75.0
82.5
90.0
97.5
105.0
112.5
120.0
127.5
135.0
142.5
150.0
Tape tension is particularly critical in short delay cartridges.
Tension must be great enough so that the hub in the cartridge turns as the
tape
moves, but tension must not be too great. Before making the splice,
check the tension. The tape loop can be tightened by gently pulling on the
end where the tape enters the hub. Gently pull tape out of the center to
loosen the tape wrap.
It is a good idea to check delay cartridges frequently.
cartridge (particularly in short lengths) wears rapidly, since the
runs continuously
rather than intermittently.
12
A delay
tape