Blocks 20 (512.000 - 537.500 MHz) and 21 (537.600 - 563.100 MHz). The model identifier sticker says 24-25 but the display says 20-21 and that's the correct one.
Operating Frequencies (MHz) for Receiver Modules:
Block 470: 470.100 - 495.600
Block 19: 486.400 - 511.900
Block 20: 512.000 - 537.500
Block 21: 537.600 - 563.100
Block 22: 563.200 - 588.700
Block 23: 588.800 - 607.900 and 614.100 - 614.300
Block 24: 614.400 - 639.900
Block 25: 640.000 - 665.500
Block 26: 665.600 - 691.100
Block 27: 691.200 - 716.700 (outside USA)
Block 28: 716.800 - 742.300 (outside USA)
Block 29: 742.400 - 767.900 (outside USA)
Block 606: 606.000 - 631.500
Block 944: (VRS only) 944.100 - 951.900
Digital latency: • 1.5 mS (receiver only - hybrid mode)
• 3.0 mS (receiver and transmitter in hybrid mode)
• 3.0 mS (receiver only - analog compatibility mode)
The 3.0 mS latency in analog compatibility mode time aligns the audio from analog and hybrid transmitters when they are used together in a Venue system.
Frequency selection: 256 frequencies in 100 kHz steps per 25.5 MHz frequency block
Channel Spacing: 100 kHz
Dual Block Range: Built in antenna mulitcoupler covers a two block range.
Pilot tone: 25 to 32 kHz; 5kHz deviation; unique pilot tone frequency for each selected carrier frequency (Hybrid mode)
Deviation: ± 75 kHz (max) (Hybrid mode)
Receiver Type: Triple conversion superheterodyne
Frequency Stability: ±0.001 %
Multicoupler Bandwidth:
Wideband High: 665 - 862 MHz
Wideband Mid: 537 - 768 MHz
Wideband Low: 470 - 691 MHz
Special Block 944: 8 MHz; 944 - 952 MHz
Front End Bandwidth:
VRS Module: 30 MHz @ -3 dB
VRT Module: 11 MHz @ -3 dB
Sensitivity (20 dB Sinad): 0.9 uV
AM Rejection: >60 dB, 2 uV to 1 Volt
Image and Spurious
Rejection: 85 dB
Third Order Intercept: VRS:+0 dBm, VRT: +6 dBm
Diversity Methods: Switched, ratio and frequency
FM Detector: Digital pulse counting detector @ 300 kHz
Audio Performance (overall system):
Frequency Response: 32 Hz to 20 kHz (+/-1dB), overall system (400 Series mode)
THD: 0.2% (typical) (400 Series mode)
SNR at receiver output (dB) In Hybrid operating mode:
SmartNR No limiting w/ Limiting
OFF 103.5 108.5
NORMAL 107.0 111.5
FULL 108.5 113.0
(Note: the dual envelope “soft” limiter provides exceptionally good handling of transients using variable attack and release time constants. The gradual onset of limiting in the design begins below full modulation, which reduces the measured figure for SNR without limiting by 4.5 dB).
Input Dynamic Range: 125 dB (with full transmitter limiting)
Audio Output Level: -15 dBu to +8 dBu, in 1 dB increments
LCD: 122x32 graphical display
Power Requirements: 10 to 18 VDC; 17.2 W max. (1.72 A @ 10 VDC to
1.05 A @ 18 VDC)
Weight: VRM with 6 VRS modules: 4.28 lbs. (1946 g)
VRM with 6 VRT modules: 4.45 lbs. (2018 g)
Dimensions: 19”W x 1.75”H x 7.75”D (panel to rear jacks)
(48.26 cm x 4.45 cm x 19.67 cm)
Note: Some specifications apply only when the receiver is operating in the Digital Hybrid (400 Series) mode.