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Technical Specifications

 

AM 1A - Technical Specifications

Nov 20, 2017

RF Specs

Output Power:
Range5 W to 1.1 kW
Accuracy2% full scale
Efficiency60% or better, 100% sinusoidal modulation of 1 kW carrier into 50 Ohm load
VSWRNominal 1.3:1 at full carrier power; will operate into higher VSWR with automatic power reduction, open and short circuit protected
Impedance50 Ohm
Frequency:
Range522 kHz to 1700 kHz, supplied on one frequency (synthesized), as ordered; accommodates 9 kHz or 10 kHz channel spacing
Stability+/-3ppm, 0 to 50 degrees C
RF Harmonics SuppressionMeets or exceeds FCC, DOC, and CCIR requirements, when preceded by external NRSC-1 compatible audio low pass filter(s)
Modulation:
TypePulse width modulation of L+R envelope with optional integrated C-QUAM AM stereo; an RF input connector (BNC) is also provided for an external RF or stereo exciter
Capabilities>145% peak positive capability at rated nominal output power into 50 Ohm load
Carrier Shift<1% at 95% negative modulation at 1 kHz
RegulatoryMeets or exceeds FCC and DOC technical requirements,meets ENG0215 safety requirements

AM Audio Specs

ModesStereo (with optional stereo card), Mono L+R, Mono L, Mono R, HD with external ASi 10; not compatible with analog stereo
Stereo (with optional stereo card):
Connector Type3 position terminal block (2)
Input Level10 dBm, +/-1 dB, L+R (or mono) to produce 100% L+R envelope modulation; other input levels accommodated by internal resistor selection
Impedance600 Ohm; inputs are balanced, transformerless, and resistive with passive RFI filtering; other impedances can be accommodated.
Amplitude Response+/-0.5 dB, 20 Hz to 10 kHz
THD + Noise<1.5% at 50% single channel modulation, 50 Hz to 10 kHz at rated power
S/N Radio>65 dB below a reference level equivalent to 100% negative modulation of either left or right channel in a 22 Hz to 30 kHz andwidth, unweighted
Separation-30 dB or better, 50 Hz to 10 kHz, at 50% single channel modulation into a 50 Ohm resistive load, at rated power
Squarewave Overshoot1% or less at 400 Hz, 50% single channel modulation with high frequency boost disabled
Squarewave Tilt1% or less at 40 Hz, 1.5% or less at 20 Hz, measured with 90% negative modulation
Incidental Phase ModulationLess than 2 degrees (0.035 radians) average, or 30 dB (typical 40 dB) below equivalent 100% L-R C-QUAM modulation 50 Hz to 10 kHz, at rated power; measured with an audio input level which generates 95% negative L+R envelope modulation at 1 kHz (9.5 dBm)
Mono:
Connector Type3 position terminal block
Input Level10 dBm, +/-1 dB, L=R (or mono) to produce 100% L+R envelope modulation; other input levels accommodated by internal resistor selection
Impedance600 Ohm; inputs are balanced, transformerless, and resistive with passive RFI filtering; other impedances can be accommodated
Amplitude Response +/-0.5 dB, 20 Hz to 10 kHz at 90% negative modulation (linear phase mode), +0.1 dB -3 dB, 20 Hz to 10 kHz at 90% negative modulation, standard configuration
THD + Noise<0.8%, 20 Hz to 10 kHz at rated power
Intermod Dist1.2% or less 1:1 ratio, 1.7% or less 4:1 ratio. 60/7000 hz SMPTE standards with 85% modulation at rated power
S/N Radio>65 dB below a reference level equivalent to 100% negative modulation in a 22 Hz to 30 kHz bandwidth, unweighted
Squarewave Overshoot0.1% or less at 400 Hz, 90% modulation (linear phase mode)
Squarewave Tilt1% or less at 40 Hz, less than 1.5% at 20 Hz, 90% negative modulation

Mechanical/Physical

Size:
Unpacked:
ECU19” W x 14.4” D x 10.5” H (48.0 x 36.6 x 26.7cm)
Output Network19" W x 27.1" D x 14" H (48.3 x 68.8 x 35.6cm)
Weight:
Unpacked90.6 lbs (41.1 kg)
Airflow:
Outlet Size:
ECU9.5” x 14” (24.1 x 35.6cm)
Output Network6.5" x 4.0" (16.5 x 10.2cm)
RF Output ConnectorType N Female

Environmental

Temperature0° to 50° C
Altitude10,000 ft (3,048 M) at 60 Hz; 7,500 ft (2,286 M) at 50 Hz
Humidity0% to 95% (non-condensing)

Electrical

AC Input Voltage196-252 VAC, 50/60Hz, single phase
Disconnect Size20 A
AC Wire Size#12 Copper AWG, THHN
Current Draw18 A max
Power Consumption2.05 kW at 125% sinusoidal modulation of 1 kW carrier
Cooling Air Requirements250 CFM (7.08 M3/min)
Heat Dissipation850 Watts maximum for 1.1 kW RF output at 125% audio tone modulation
BTU2,900 BTU/H for 1.1 kW RF Output at 125% audio tone modulation
Power Factor> 0.75 at full load
Surge Protection275 V MOV

All Specifications Subject to Change Without Notice


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