IMPORTANT
Every
wireless microphone installation is a unique
situation, and can present a variety of problems.
Never
attempt a live performance without a
“walkthrough” first. And if major changes (fur-
n i t u r e , s c e n e r y , e t c . ) w e r e m a d e s i n c e t h e
walkthrough, check the wireless microphone
operation again.
SPECIFICATIONS
RF Power Output
50 mW maximum; 15 mW typical
Modulation
FM (54F3) ± 12 kHz deviation, 50 µsec pre-emphasis
Modulation Limiter
Internal compressor
Audio Level Adjustment Range
>40
d B
Antenna
Integral dipole; end-loading provided by wire coil in
battery cap
Transducer Type
Condenser (electret bias)
Frequency Response
See Figure 5
TYPICAL FREQUENCY RESPONSE
FIGURE 5
Polar Pattern
Supercardioid response- narrower than cardioid for
higher directionality, superior rejection of undesirable
sounds (see Figure 6)
TYPICAL POLAR PATTERNS
FIGURE 6
Maximum SPL
(for 3% THD at 1 kHz)
118 dB or greater, level control full clockwise; 138 dB
or greater, level control set for 20 dB or more attenua-
tion
Noise
(level control full clockwise)
SPL equiv. max., A-weighted . . . . . . . . . . . . . 34 dB
SPL equiv. max., per DIN 45 405 . . . . . . . . . . . . . 37 dB
Power
Battery Type: 9 - v o l t a l k a l i n e ( N E D A 1 6 0 4 A ) o r
lithium; 8.4-volt nicad optional
Battery Life:
12 to 14 hours typical (alkaline); 35
h o u r s t y p i c a l ( l i t h i u m ) ; 3 h o u r s
typical (8.4-volt nicad; per charge)
Current Drain: 24 mA typical; 28 mA max.
Case
Matte black enamel high-impact thermoplastic and
steel with black steel grille
Dimensions
See Figure 7
OVERALL DIMENSIONS
FIGURE 7
Net Weight
240 grams (8.5 oz); 285 grams (10.1 oz) with battery
ANTENNA
The W15HT/87’s antenna uses a loading coil tuned to
the operating frequency of the transmitter (see table
under End Cap description). End caps of different
wireless microphone transmitters should not be inter-
mixed or improper operation may result.
The transmit-
ting antenna is omnidirectional, that is, it radiates
e q u a l l y i n a l l d i r e c t i o n s . F o r o p t i m u m w i r e l e s s
m i c r o p h o n e a p p l i c a t i o n s , t h e a r e a b e t w e e n t h e
W15HT/87 and the receiver should be as free of RF
obstructions as possible.
TRANSDUCER
The dynamic transducer has a supercardioid pickup
pattern, which is considerably narrower than a cardioid
pattern, with points of minimum pickup at approximate-
ly 125° from the front rather than the cardioid’s 180°
null. This results in greater gain-before-feedback and
less unwanted pickup of other voices, instruments or
noise (microphone “bleed”). In addition, it can be very
useful for miking single sources in a reverberant or
noisy environment. The W15HT/87 also makes optimum
use of proximity effect to give the performer control of
low-frequency sound, from the warm intimacy of close
miking to the natural sounds of normal-to-distant mik-
ing.
The transducer is fully shock-mounted for minimal
operation.
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