User manual

MTH400 User Manual
Rev.01
13
TECHNICAL SPECIFICATIONS
Switchable channels
2400 allocated by 40 groups of 60 channels (in specific frequency range),
quickly selectable with dedicated buttons
Switching window
Up to 232 MHz, depending on band (see below code table)
Frequencies
Quartz PLL frequency synthesizer circuit (25 kHz step)
Frequency stability
▪ ± 2,5 ppm (in the rated temperature range)
▪ ± 2.5 kHz (in the rated temperature range)
Temperature range
-10 ÷ +55 °C
Max RF power
▪ 50 mW (ERP) when high power selected (note: In some countries high
power can be disabled, for local norm!)
▪ 10 mW (ERP) when low power selected (to respect some local norm)
Spurious emissions
< 2 nW
Modulation
wideband FM, with 10 µs pre-emphasis
Nominal deviation
±40 kHz (Peak deviation = ±56 kHz)
Telemetry feature
MTH400 transmits also a digitally modulated sub-carrier, suitable for:
▪ tone-squelch
operating
▪ remote battery
monitoring
▪ optional PTT (push
to talk) operation
AF input connection
Directly interchangeable microphone-heads
AF input level
-60 ÷ +0 dBu nominal, quickly settable by steps of 1 dB with dedicated
buttons
Max. input level
+6 dBu
Max sound pressure
150 dB SPL (0,5% THD), with
MCM301/MCM302/MCM303/MCM304/MCM305 condenser-heads
Noise-Reduction
ENR (Wisycom Extended-NR), with independent Attack- and Recovery-time,
noise optimized
ENC (Wisycom Extended-NC), with independent Attack- and Recovery-time,
voice optimized & with reduced pre-emphasys
AF bandwidth
45 Hz ÷ 21 KHz (3dB)
55 Hz ÷ 20 KHz (1dB)
Distortion
< 0.3 % (0.15 % typ.)
Signal-to-noise ratio
typ. 115 dB (A)
rms
with 40kHz deviation
typ. 121 dB (A)
rms
with 56kHz deviation
Led
Led indication with bicolor led (red & green) on wireless power switch:
▪ Wireless transmission status: GREEN on/off
▪ Modulation peek (if activated): RED
▪ Battery lifetime status: GREEN
- steady (> 25%) - slowly blinking (< 25%) - quickly blinking (<12%)
▪ Ptt status: RED if active
Display
High contrast OLED (Organic light-emitting diode) display (96 x 36 pixels)
8 step battery lifetime indication: 7 bars (100%-87%-75%-63-50%-38%-25%)
and “empty bar” quickly blinking (12% remaining)
Power supply
2 AA size cell (Alkaline, rechargeable NiMH)
Battery life (alkaline)
approx. 11 hours @ 50mW continuous working; up to 14 hours @ 10mW
Dimensions
 body max. diameter 33 mm (without microphone-head)
 total length 183 mm (without microphone-head)
Weight
Approx. 300g, including battery and MCM3xx (condenser) mic-head ( approx.
260g batteries excluded)
Note: The above technical specifications refer to the MTH 400 “transmitter” section. The acoustic specs are relevant to
the microphone-head used. The MTH 400 transmitter complies with ETS 300 422.