12
HE-12/HE-4
Instruction Manual
RF
Frequency Range:
54-860 MHz (Broadcast 2-13, Cable 14-135)
Output Lev el: +45 dbmV
Output Lev el Range: 10 db continuously ad just able
Aural/Vi su al Carrier Ratio:
-11 to -19 dB continuously adjustable
Visual Carrier Frequency Tol er ance:
±10 kHz (standard channels) ± 5 kHz
(aeronautical channels)
Aural Carrier: 4.5 MHz above vi su al
Frequency Set ting: ±1.5 kHz
Spurious Out puts: -60 dbc, min i mum
C/N Ratio In Channel: 60 db
broadband Noise: -90 db
Output Re turn Loss: 12 db
IF (Internal) Frequency: 45.750 MHz
Video
Input Lev el: 1.0 V p-p for 87.5 % mod u la tion
Frequency Response fv -0.5 MHz to fv +4.2 MHz:
±1.0 db
Video C/N: 60 db (4 MHz bW)
P-P Vid eo to RMS Hum Ra tio: 60 db
Differential Gain: ±4.0 % @ 87.5% Modulation
Differential Phase: ± 2° @ 87.5% Modulation
Input Re turn Loss: 18 db
Audio
Input Lev el: 140 mV RMS for 25 kHz peak deviation
Input Impedance: 10k Ohm, unbalanced
Frequency Range: 20 Hz to 20 kHz (MICM-45C)
Frequency Response:
±1.0 db, (50 Hz to 12 kHz) Reference to Std.
75 µs Pre-em pha sis (MICM-45C)
± 0.3 db (50 Hz to 50 kHz) (MICM-45S)
in Stereo Configuration w/o pre-emphasis
Total Harmonic Distortion (%):
1.0 at 25 kHz Deviation
Specifications MICM-45 (Typical)
Stereo Separation (MICM-45S):
50 Hz - 100 Hz: 15 db
100 Hz - 1 kHz: 25 db
12 kHz: 18 db
Aural Intercarrier: ±5 kHz (0° to +50° C), std.
General
Power Re quire ments
External: +12 VDC @ 160 mA
+5 VDC @ 130 mA (MICM-C)
+5 VDC @ 180 mA (MICM-S)
Temperature Range: 0° to +50° C
Mechanical
Dimensions (W x H x D): 1.2 x 3.5 x 7.5 inches
Weight: 0.65 lbs (0.30 kg)
Connectors/Impedance
Audio In put: RCA Phono, fe male (MICM-45C)
L/R Audio Inputs: RCA Phono, female
Video In put: 75 ohm “F” type, fe male
RF Out put: 75 ohm “F” type, female
Power: 3 Pin Header
Controls
Video Level: Pot
Audio Level: Pot
Aural Carrier Level: Pot
RF Out put Lev el: Pot
Indicators
Power ON: LED, green
Video Over Modulation: LED, red (MICM-45S)
Audio Over Modulation: LED, red (MICM-45S)
Stereo Indicator: LED, red (MICM-45S)
MICM-45 Modulators
Description
The MICM-45 is a professional quality, channelized, heterodyne audio/video modulator. The unit provides modulated RF
carrier output on any single VHF channel, including: broadcast TV (2-13), CATV (14-135). The MICM-45 is ideal for placing
audio and video onto any unused VHF channel. Any standard audio/video source can be used, such as satellite receivers,
television cameras, video tape recorders, or television demodulators.
The MICM-45 utilizes SAW filtering with FCC group delay pre-distortion to provide true vestigial sideband selectivity. This
makes the MICM-45 perfect for use in adjacent channel systems.
The MICM-45C takes baseband audio and video and modulates these signals onto the desired output channel. The MICM-
45S takes baseband L/R audio and video and modulates these signals into the desired output channel. The heterodyne
conversion process used in the MICM-45 employs a crystal referenced, PLL synthesized local oscillator. This guarantees rock
solid, no-drift output for the life of the modulator. The MICM-45 meets FCC Docket 21006 aeronautical frequency offset
requirements (±5 kHz video carrier accuracy). The modulator accepts standard polarity (sync negative) video in the range
of 0.7 to 2.5 V p-p.
The MICM-45C has field defeatable audio pre-emphasis to provide stereo compatibility with any external BTSC stereo
generator providing a composite stereo baseband output.
The MICM-45S is a stereo A/V modulator providing a stereo audio and video modulated RF carrier on any single VHF
channel. All other features and specifications are identical to the MICM-45C except as noted below.
