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Technical Specifications

AM 500A - Technical Specifications

Feb 19, 2019

RF Specs

Output Power:

Range: 5 W to 500 W

Accuracy: 2% full scale

Efficiency: 60% or better, 100% sinusoidal modulation of 500 W carrier into 50 Ohm load

VSWR: Nominal 1.3:1 at full carrier power; will operate into higher VSWR with automatic power reduction, open and short circuit protected

Impedance: 50 Ohm

Frequency:

Range: 522 kHz to 1700 kHz, supplied on one frequency (synthesized), as ordered; accommodates 9 kHz or 10 kHz channel spacing

Stability: ±3ppm, 0 to 50° C

RF Harmonics Suppression: Meets or exceeds FCC, DOC, and CCIR requirements, when preceded by external NRSC-1 compatible audio low pass filter(s)

Modulation:

Type: Pulse 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

Regulatory: Meets or exceeds FCC and DOC technical requirements,meets ENG0215 safety requirements

AM Audio Specs

Modes: Stereo (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 Type: 3 position terminal block (2)

Input Level: 10 dBm, ±1 dB, L+R (or mono) to produce 100% L+R envelope modulation; other input levels accommodated by internal resistor selection

Impedance: 600 Ohm; inputs are balanced, transformerless, and resistive with passive RFI filtering; other impedances can be accommodated.

Amplitude Response: ±1 dB, 20 Hz to 10 kHz

THD + Noise: <2.0% at 50% single channel modulation, 50 Hz to 10 kHz at rated power

S/N Radio: >55 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: -25dB or better, 50 Hz to 10 kHz, at 50% single channel modulation into a 50 Ohm resistive load, at rated power

Squarewave Overshoot: 1% or less at 400 Hz, 50% single channel modulation with high frequency boost disabled

Squarewave Tilt: 1% or less at 40 Hz, 1.5% or less at 20 Hz, measured with 90% negative modulation

Incidental Phase Modulation: Less than 2° (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 Type: 3 position terminal block

Input Level: 10 dBm, ±1 dB, L=R (or mono) to produce 100% L+R envelope modulation; other input levels accommodated by internal resistor selection

Impedance: 600 Ohm; inputs are balanced, transformerless, and resistive with passive RFI filtering; other impedances can be accommodated

Amplitude Response: ±1 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: <1.2%, 20 Hz to 10 kHz at rated power

Intermod Dist: 1.2% 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 Overshoot: 0.1% or less at 400 Hz, 90% modulation (linear phase mode)

Squarewave Tilt: 1% or less at 40 Hz, less than 1.5% at 20 Hz, 90% negative modulation