The AM50 is suitable for all low-power AM (MF) broadcasting applications such as local radio, travel, information and sports services. Unlike many low-power transmitters, the AM50 is a fully featured professional design offering excellent audio quality and RF performance.
The single chassis, rack-mount design features comprehensive output protection, front-panel metering and remote control. Audio inputs are selectable, balanced or un-balanced.
The AM50 is used by almost all specialist sports broadcast stations in the UK. We supply complete packages based around this design, including antenna systems, ATUs, audio processing and a full installation service.
Specifications
frequency range (EUR) 531 to 1602 kHz
(USA) 530 to 1700 kHz
frequency selection single channel crystal
frequency stability <±7 Hz (max.)
frequency adjustment >±50 Hz
power output (adjustable) 5 to 50 Watts (carrier)
power output stability <10% (0.8 dB)
output protection latched shutdown if VSWR > 2:1, self reset option, remote reset
RF output impedance 50 (Ohm)
spurious emissions <-60 dBc (@ 50 W)
harmonic emissions <-60 dBc (@ 50 W)
modulation type A3E
continuous max. modulation 99% negative peak
125% positive peak
audio inputs (selectable) 600 (Ohm) (balanced)
10k (Ohm) (unbalanced)
audio input level -10 to +10 dBu
frequency response (±1 dB) 35 Hz to 15 kHz
T.H.D. @ 1 kHz 0.25% (typ.) (50% mod.)
T.H.D. @ 100 Hz - 10 kHz 0.5% (max.) (<90% mod.)
noise (measured ccir 468 <-63 dBr (unwtd)
peak w.r.t. 95% mod.) <-60 dBr (wtd)
mains supply (options) 230/110 Volts
(AC 50/60 Hz nom.)
mains voltage tolerance +6 / -10% (std.)
power consumption (@ 50 W)
@ no modulation 120 VA (maximum)
@ 100% modulation 180 VA (maximum)
environmental 0º to + 40º Celsius
0 to 95% NCRH
rack mount enclosure 3Ux19"x400mm
weight 12.4 kg
connectors IEC (mains), 3fXLR (audio in), 'N' type (RF out), BNC (RF sample), 'D' type 15f (remote)
meters (analogue) forward & reflected power
indicators - green (status) +12 V, -12 V, +50 V, +100 V, RF drive
indicators - red (fault) over-mod., audio fail, VSWR fault, temperature high (latched, resetable)
remote functions standby / on (with VSWR trip reset), fault indicator mimics
front panel controls power on / off (security key operated), latch reset
rear panel controls normal / test power level switch, RF power, fine frequency, modulation level
