User's Guide

T6T 50 W VHF Transmitter Page 4 Specification
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AM Modes
The transmitter can operate in AM-Voice mode (standard) and AM-MSK mode (optional). The following
specifications apply to both modes unless stated otherwise.
Transmitter RF Characteristics
RF Power Output
The RF carrier output power is adjustable in 1 W steps from 5 W to 50 W (as an option, the maximum
selectable power can be limited). Output power is automatically controlled under the following conditions:
Frequency range Variations in power remain within -0 to +1 dB over the operational
frequency range.
Low supply voltage Variations in power remain within ±1 dB for supply voltages between
24 Vdc and 32 Vdc.
High VSWR Loop error can reduce power progressively by up to 3 dB. Variations
in power remain within ±1 dB into a VSWR of up to 2.5:1. At a VSWR
greater than this the output power may be reduced by 10 dB ±1 dB.
High RF PA temperature If the RF PA temperature sensor exceeds 80°C the output power is
reduced by 3 dB ±1 dB. If the RF PA temperature sensor exceeds
90°C the transmitter is de-keyed and automatically re-keyed at 70°C.
Duty Cycle
All variants 100% continuous operation.
Channel Spacing
AM-Voice mode The transmitters are capable of both 25 kHz channel spacing and
8.33 kHz channel spacing.
AM-MSK mode 25 kHz.
Offset Carrier
Non-HS variants (AM-Voice) The non-HS T6T is capable of offsetting the carrier frequency to
provide 2, 3 and 4 carrier offset.
HS variants (AM-Voice) The HS T6T is capable of offsetting the carrier frequency to provide 2,
3, 4 and 5 carrier offset.
AM-MSK mode Offset carrier is not available.
Harmonic Outputs
All variants Second harmonic outputs are less than -36 dBm, third harmonic
outputs are less than -46 dBm and fourth harmonic outputs and above
up to 4 GHz, are less than -56 dBm.