Features

• Unexcelled off-air reception of analog-FM broadcasts with highly-accurate displays of total modulation and other measurements, even in the presence of on-channel or adjacent-channel HD Radio carriers at any level.

• Intuitive, menu-driven setup from the front panel, or remote setup and operation with the built-in Webserver that may be addressed over any IP network by computer or mobile device. The 541 supports full SNMP remote control and monitoring.

• Graphic front-panel and remote display of all level metering; FFT spectrum analysis of IF passband, MPX baseband and program audio; oscilloscope display of program audio and stereo XY.

• Alarms for a range of signal faults, with tallies and SMS/text or email message dispatches to specific individuals for various alarm conditions. All alarms are logged chronologically as well.

• Analog, AES3-digital, HTTP/UDP Web-streaming and independent AoIP-streaming program audio outputs, plus an FM composite/MPX baseband output.

• The BandScanner™ utility scans the FM spectrum and displays each station with its signal level, PI code and call sign.

• StationRotation™ mode enables automatic sequential monitoring of multiple station presets.

• Collects and logs a history-over-time of FM and audio signal parameters.

• Accurate program loudness measurement to the human perception ITU-R BS.1770 (‘LU’) loudness specification.

• Stays on-channel and retains measurement setups through signal and power losses.

Specifications

PLEASE NOTE:

Specifications tabulated here are actual, real-world measurements, not optimistic allusions to theoretical ideals. Measurement results should be repeatable when using the appropriate, laboratory-grade test equipment.

RF & RECEPTION:

Tuning Range:

Tunes 76.0MHz-108.0MHz in 100kHz steps.

Antenna Input:

75-ohm (F), 1VRMS max.

High-Level RF Input:

50-ohm (BNC), 5VRMS max.

Off-Air Sensitivity (for 50dB monaural SNR):

• 5dBµV or better with de-emphasis.
• 15dBµV or better unweighted.

Reception Modes:

Stereo / Forced Mono / SCA Program Audio

FM BASEBAND

(Off-Air or High Level; (D) indicates measurements taken with de-emphasis.)

• Frequency Response: ±0.25dB, 10Hz-100kHz.
• Signal-to-Noise (D): >83dB.
• Distortion (D): <0.01% THD+N; <0.01% IMD (SMPTE, 60Hz/7kHz, 4:1).
• FM Deviation: Indicates composite (total) and independent positive and negative deviations. ±75kHz = 100% Modulation; 0-200% metering with ±1% accuracy. *AM Noise (D): Measures down to 87dB below 100% AM Modulation.
• FM Stereo Pilot: Indicates 0-15% pilot injection; pilot frequency readout has ±0.1Hz accuracy.
• FM Subcarriers: Indicates percent injection of 38kHz (residual), 57kHz RDS, 67kHz/92kHz SCA subcarriers.

FM AUDIO PERFORMANCE

(Off-Air or High Level; taken with de-emphasis; (M) indicates measurements taken in monaural reception mode.)

• Frequency Response: ±0.1dB, 20Hz-15kHz.

• Signal-to-Noise (M): Analog Out: <0.01% THD+N; <0.02% IMD (SMPTE, 60Hz/7kHz, 4:1). Digital Out: <0.01% THD+N; <0.01% IMD (SMPTE, 60Hz/7kHz, 4:1).

• Stereo Separation: >64dB, 20Hz-15kHz
• FM Stereo Crosstalk (Main-Sub or Sub-Main): >67dB, 20Hz-15kHz,.
• FM De-emphasis: 75µs / 50µs / None.

INPUTS, OUTPUTS AND PORTS:

MPX Output:

(BNC) select either MPX or 19kHz stereo pilot sample; adjustable from 1VPP to 6VPP in 0.01V steps; ±0.25dB, 10Hz-100kHz.

Program Audio Outputs:

May be assigned to the FM-stereo program or to SCA audio. Unless otherwise noted, performance parameters reflect FM Stereo Performance cited above.

• Balanced Analog: (XLR) Left and Right outputs adjustable from –15dBu to +15dBu in 0.1dB steps; 200Ω resistive source.
• AES Digital: (XLR) Adjustable from –30dBFS to 0dBFS in 0.1dB steps; user-selected 44.1kHz or 48kHz sample rate; 110Ω transformer-coupled.
• Dante/AES67 Compatible AoIP Port: (RJ45) Output at 44.1kHz (Dante-only) or 44.1kHz/48kHz (Dante/AES67); AoIP utility has independent IP, Audio Format and Transmit Flow settings; level adjustable from –30dBFS to 0dBFS in 0.1dB steps.

Program Audio Outputs (continued):

• UDP Stream: ADTS or ADTS in MPEG-TS transport.
• HTTP/Icecast ‘Casual’ Listening Stream: Web browser remote-listening stream employs HE-AACv2 encoding, 44.1kHz or 48kHz sample rate, bit-rates from 18kbps to 64kbps; accommodates up to 10 simultaneous listeners. HTTP/Icecast and raw UDP streams are available simultaneously.
• Headphone Jack: (¼” TRS) Menu-adjustable listening level.
• LAN Port: (RJ45) LAN connection to local network or Internet provides remote monitoring, control, listening and full SNMP implementation; user-programmable network setup and streaming parameters.
• LAN Port: (RJ45) LAN connection to local network or Internet provides remote monitoring, control, listening and full SNMP implementation; user-programmable network setup and streaming parameters.

DISPLAYS AND DISPLAY OPTIONS:

Bargraph & Numerical Level Metering:

• Carrier Modulation • Stereo Pilot & Subcarriers.
• MPX Power • Demodulated L/R & L+R/L-R
• Stereo Separation • Stereo Crosstalk • BS.1770 Loudness • SCA Levels • Synchronous & AM Noise.

Graphic Displays and History Plots:

• IF Spectrum • MPX Spectrum • Audio Spectrum • Audio Oscilloscope • Audio XY • FM Modulation History.
• Audio Level History • RF Metrics History.
• BandScanner™ utility.

RDS Fields Displayed:

• PS • PI • Call • RT • RT+1 • RT+2 • PTY • PTYN • CT • M/S • DI • TP • TA • AF • ODA • Block Error Rate • Groups & Group Use Statistics.

TIMEKEEPING AND ALARMS:

Real-Time Clock:

• Auto-sets to Internet time; auto/manual DST setting; battery backup.

Local & Remote Alarms:

• Carrier Overmod • MPX Power • Audio Loss • Low Signal • Pilot Loss • Multipath • RDS Loss • RDS PI Error • RDS RT

• RDS CT • RDS TMC • Pilot Loss • MPX Power. (Most alarms have multiple parameter settings. All alarms can send text or email notifications. Alarms are automatically logged daily, weekly and monthly.)

POWER, ENVIRONMENTAL, MISCELLANEOUS

Power Requirements

88-264VAC, Single-Phase; 12W.

Size and Weight

3.5”H x 19”W x 9”D (2U); 10 lbs. (shipping weight)

Operating Environmental

32°F/0°C-122°F/50°C; 0%-95% non-condensing relative humidity; 10,000ft/3048m.

Conformances

• CE: EN50081-1 / EN50082-1, 93/68/EEC
• RoHS: 2002/95/EC.