Helios DMB Modulator

VHF		174-240 MHz (Band III)
Input format		NI (G703), NA5376 (G704) or NA5592 (G704)
Max static delay		1 s
Offset delay		1 s
Main signal output level		0 dBm +/-2dB
Monitoring signal		-20dB +/-2dB (Relative to main output)
Output level stability		+/-0.1dB / 10°c
Return loss		>15 dB
I/Q amplitude unbalanced		< 0.05%
I/Q quadrate error		< 0.05
Clock and synchronization
10 MHz reference output		0 dBm ± 3 dB
External 10 MHz reference input:
Impedance		50Ω
Level		From -5 to +10 dBm
External 1 pps reference input :
Level		TTL level – 5kΩ
Min pulse width		1 µs

Hardware description

VHF nominal output power	300 W, 600 W, 1.2 kW, 2.4 kW
Frequency range	174 – 240 MHz Band III
Output impedance	50Ω
Output connector	7/16, 7/8 EIA
Efficiency	Typical : 30%
Frequency stability	1x 10-07 / an
Spurious rejection	> 75dB
Liquid cooled	Redundant hydraulic rack
Operating altitude	< 2900 m (9512 feet)
Humidity	< 90%
Electrical power	Single phase : 204 – 264VAC / 47 – 53 Hz Three phase : 320 – 450VAC / 47 – 53 Hz
Type of power line	Single phase : 3 cables (Ph, neutral, ground) Three phases : 5 cables (Ph1, Ph2, Ph3, neutral, ground)
Cos φ	> 0,90
Temperature range	5°C – 45°C (Normal operation) 0°C – 50°C (Maximum)
Air cooled	Each chassis has redundant fans
Size	Air cooled transmitters : 42U 19’’ 2100 (H) x 600 (l) x 1000 (L) mm
Weight	Helios : ± 14kg Goliath : ± 20kg