The AARON 655 employs a sensitive FM / HD Radio™ SDR-based receiver that invariably returns to the programmed frequency and reception mode following a power interruption. In addition to FM and HD1-8 program sources for rebroadcast, the 655 accepts analog, AES-digital and streaming program inputs with fallback-priority selection. Outputs are FM-stereo-multiplex (MPX) as well as both analog and AES digital program line outputs and output streaming.
The AARON 655 includes an onboard RDS encoder that can either pass or regenerate incoming RDS, and can also reformat HD Radio™ ‘PAD’ data for RDS retransmission.
The 655´s audio processor employs a parametric equalizer offering continuous control over the audio signal's frequency content with 3 bands of dynamic compression and selectable crossovers. Audio processing includes gated and ‘windowed’ AGC, a unique ‘syllabic’ leveler, with both wideband and independent HF limiting.
IP connectivity with a Web-browser interface permits total remote control of the unit from any Web enabled device, along with remote audio monitoring. Local GPIO failure alarms are augmented with email notifications, alarm logs, and full support for SNMP operation.
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- Deborah Luhrman Collaboration with EMF to Develop the AARON 655
87.5MHz - 107.9MHz in 100kHz steps
5dBμV for 50dB unweighted, monaural analog-FM SNR
5μs or 50μs, menu-selectable
75Ω (BNC); 1V p-p - 6V p-p for ±75kHz FM carrier deviation
RJ45 jack TCP/IP network connection for complete remote setup and operation of the AARON 655; supports SNMP
4 GPI, 6 GPO screw-terminal connections, all assignable with selectable logic polarity; enable contact-closure control of certain setup and operating functions and provide local external alarm tallies or connection to remote control systems
¼-inch front-panel (TRS)
Four progressive (sequential) failovers may be selectively programmed to respond to carrier loss, audio loss, FM pilot loss, HD loss, stream loss or RDS mismatch as appropriate to the source fault.
Gated, ‘gain-riding’ AGC with ±15dB capture range; dualrate ‘windowed’ operation
Variable ‘syllabic’ 2:1 compression normalizes dialog and music sources
4-sections of parametric EQ, each with variable frequency, ‘Q’ and gain
Variable bass enhancement accents the initial bass attack
3-bands of r.m.s. and peak compression with selectable crossover frequencies, variable master and individual band drive controls
Feed-forward final peak limiting eliminates flat-top clipping; independent HF limiter for pre-emphasis protection
0dB - 3dB adjustable MPX clipping depth (excludes stereo pilot and RDS subcarrier)
10 factory, 10 user-defined presets
PI, PTY, PS, RT, M/S, TP, DI, CT, AF
HD Radio™ Name, Slogan, Artist, Title, Album and Genre may be converted to the RDS scrolling-PS and RT fields
Streamed Name, Metadata, Description and Genre may be converted to the RDS scrolling-PS and RT fields
Accepts dynamic PS and Radio Text updates via IP
A built-in spectrum analyzer utility sweeps the entire FM band (or a selected portion) and presents a graphic display of all signals received, includinag RSSI values and HD Radio™ transmissions.
Fault alarms include radio audio loss, analog audio loss, digital audio loss, stream audio loss, low signal, RDS error, stereo pilot loss and HD Radio™ channel loss. Alarms trigger front-panel indications, local (GPO) closures, browser interface notations, SMS/email dispatches, SNMP.
Alarms are logged and may be downloaded as daily, weekly or monthly CSV files.
All setup and operating controls and alarm functions of the AARON 655 are under SNMP management.
20Hz - 20kHz; programmable frequency and amplitude
88VAC - 264VAC, 48Hz - 63Hz (‘universal’); 12 watts
H: 1¾”/44mm, W: 19”/483mm, D: 9½”/240mm (1U); 9lb/4kg (net, 12lbs/5.4kg (shipping)
Continuous operation at ambient temperatures between 32ºF/0ºC and 122ºF/50ºC; 0-95% relative humidity, non-condensing, altitudes to 10,000ft/3,048m.