User's Manual

MTH400 User Manual
16
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 Variants on the next page)
Frequencies
Quartz PLL frequency synthesizer circuit (25 kHz step)
Frequency stability
▪ ± 2,5 ppm (in the rated temperature range)
Temperature range
-10 ÷ +55 °C
Max RF power
▪ 10mW (ERP) (to respect some local norm)
▪ 50 mW (ERP) (note: in some countries middle power can be disabled, for local norm!)
▪ 100 mW (ERP) (note: in some countries high power can be disabled, for local norm!)
Spurious emissions
< 2 nW
Modulation
wideband FM with 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 dB adjustable range from -54 to +6 dBu at peak deviation (1 kHz), adjustable in 1 dB
steps
Max. input level
+26 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-emphasis
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 or Lithium)
MTH400 Battery life
(2AA alkaline)
▪ approx. 14 hours @ 10mW continuous working
▪ approx. 10 hours @ 50mW continuous working
▪ approx. 7 hours @ 100mW continuous working
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)