Title: SPEC, ZX TRANSMITTER FAMILY Sheet 3 of 7 Rev: B Dwg: 817-2350-085
ZX Transmitter Specifications – CD Models
GENERAL
FM power output range:
1
ZX2500: 625 W – 2750 W
ZX3750: 950 W – 4125 W
ZX5000: 1250 W – 5500 W
ZX7.5: 1900 W – 8250 W
ZX10: 2500 W – 11000 W
RF output connector:
2
ZX2500: EIA 1-5/8” flangeless, 50 ohms
ZX3750: EIA 1-5/8” flangeless, 50 ohms
ZX5000: EIA 1-5/8” flangeless, 50 ohms
ZX7.5: EIA 1-5/8” flanged, 50 ohms
ZX10: EIA 1-5/8” flanged, 50 ohms
Excitation: Harris DIGIT
R
CD digital FM exciter.
RF amplifers: MOSFET, broadband (no-tune), hot plug
modular, universal (same type all tx models), 4.5 kg.
Power supplies: Switchmode, auto-ranging, hot plug modular,
universal, 2.5 kg.
Frequency range: 87.5 - 108 MHz, digitally programmable in
50 Hz increments.
Frequency stability: +/- 150 Hz, 0
o
C to 50
o
C ambient
temperature range (using internal frequency reference).
Power stability: +/- 0.25 dB.
Reverse power: Protected against open or short circuit, all
phase angles. Capable of operation into infinite VSWR
with user-adjustable foldback threshold. Threshold set to
2.5% of FM nameplate power level at factory.
External frequency control: Capable of locking to an external
10 MHz reference for use in FM synchronous applications
when fitted with optional DIGIT CD Sync Board (992-
9850-001). Sync input requirement: 2.82 V p-p or TTL
level. Sync input connector: BNC female.
Harmonic / spurious output: Meets or exceeds FCC,
Canadian, CE, and Chinese requirements.
Modulation type: Direct digital synthesis (DDS) using a 32-bit
NCO (numerically controlled oscillator).
Modulation capability: 208% (+/- 75 kHz reference standard).
Factory programmable in 6 dB increments to +/- 468 kHz.
PLL/AFC overload characteristics: Immune to carrier
dropouts caused by high energy, low frequency modulation
(program audio is not applied to the VCO).
Modulation indication: Digitally generated peak reading,
0.25% accuracy (at 150% modulation setting), color-coded
LED display with baseband over-modulation indicator.
Asynchronous AM S/N ratio: 55 dB minimum below
equivalent 100% amplitude modulation by 400 Hz using 75
ȝs de-emphasis (no FM modulation present).
Synchronous AM S/N ratio: 50 dB minimum below
equivalent 100% amplitude modulation with 75 ȝs de-
emphasis and 400 Hz highpass filter (FM deviation +/- 75
kHz by a 1 kHz sine wave).
1
VSWR 1.2:1 or less. De-rate to nameplate rating for VSWR
up to 1.5:1.
2
EIA 3-1/8” flanged available as option, ZX7.5 and ZX10.
AC mains requirement: 90 - 264 V
3
, 47 - 63 Hz, IEC C14
inlet for exciter and following connections to power
amplifier:
ZX2500/3750: 190 - 264 V
4
, 47 - 63 Hz, triple IEC
C20 inlets. Configurable on-site for single or three-
phase connection: 190 - 264 V single phase, 190-
264 V delta, 190 - 264 V wye, or 330 - 450 V wye.
ZX5000: Same as 3750 W model except triple
PowerCon NAC3MPA inlets.
ZX7.5 and ZX10:
Screw terminal connections.
Option: 190 - 264 V, 47 - 63 Hz, delta
Option: 330 - 450 V, 47 - 63 Hz, wye
Option: 190 - 264 V, 47 - 63 Hz, dual single-phase
(top and bottom amplifiers)
Power consumption: (FM mode at nameplate power level)
ZX2500: 4700 W max; 4300 W typical
ZX3750: 7000 W max; 6350 W typical
ZX5000: 9300 W max; 8500 W typical
ZX7.5: 14000 W max; 12700 W typical
ZX10: 18600 W max; 17000 W typical
Power factor (displacement): 0.98 typical.
Phase rotation/balance: all AC inputs independent.
Observation of correct phase rotation and balance not
required.
Mains restart: > 80% output power in less than 5 seconds after
AC mains failure.
Altitude: 3000 m elevation above mean sea level.
Ambient temperature range: 0 - 50
o
C at sea level, upper limit
de-rated 2
o
Centigrade per 300 m elevation AMSL.
Humidity: 95%, non-condensing.
Dimensions: Standard 19” (48.3 cm) EIA rack; 1RU = 4.45 cm
(1.75”)
ZX2500: 16 RU amp + 1 RU exciter, 62 cm (25”) depth
ZX3750: 16 RU amp + 1 RU exciter, 62 cm (25”) depth
ZX5000: 16 RU amp + 1 RU exciter, 62 cm (25”) depth
ZX7.5: 44 RU rack, 96 cm (38”) depth
ZX10: 44 RU rack, 96 cm (38”) depth
Weight, less exciter (all modules installed):
ZX2500: 67 kg (148 lbs) approx.
ZX3750: 81 kg (179 lbs) approx.
ZX5000: 95 kg (210 lbs) approx.
ZX7.5: 225 kg (500 lbs) approx.
ZX10: 250 kg (550 lbs) approx.
Air cooling: Air input with built-in filter at front. Air exhaust
with built-in DC fans at rear. Ducted air exhaust and/or
input available as option.
ZX2500: 17 m3/min (600 cfm) approx.
ZX3750: 17 m3/min (600 cfm) approx.
ZX5000: 17 m3/min (600 cfm) approx.
ZX7.5: 34 m3/min (1200 cfm) approx.
ZX10: 34 m3/min (1200 cfm) approx.
Ambient noise: Worst case, 1 m from front face, 1 m above
ground. Mounted in rack, no ducted air input or exhaust.
Figures in parentheses are for ducted air input and exhaust
option.
3
Certified to 100-240 V nominal range +/- 10% testing margin.
4
Certified to 208-240 V nominal range +/- 10% testing margin.
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