Park Air Systems T6TR, User Documentation

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T6TR VHF 50 W Transceiver Page 4 Specification
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AM Modes
Introduction
The transceiver can operate in AM-Voice mode and AM-MSK mode. The following specifications apply
to both modes unless stated otherwise.
Transmit RF Characteristics
Output Impedance
50 ohms.
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 Loop error can reduce power progressively by up to ±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 VSWRs
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 transceiver is de-keyed and automatically re-keyed at 70°C.
Rise time The power rise time from a keying contact to 90% of full power is less
than 20 ms.
Duty Cycle
All variants 100% continuous operation.
Channel Spacing
AM-Voice The transceivers are capable of both 25 kHz channel spacing and
8.33 kHz channel spacing.
AM-MSK 25 kHz only.
Offset Carrier
AM-Voice The T6TR is capable of offsetting the carrier frequency to provide 2, 3
and 4-carrier offset.
AM-MSK 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.