Park Air Systems T6TR, User Documentation

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T6TR VHF 50 W Transceiver Page 9 Specification
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Distortion
25 kHz channel spacing For RF input signals between -53 dBm and +10 dBm, the total
harmonic distortion is less than 5% within the frequency range 300 Hz
to 3.4 kHz when the modulation depth is between 30 and 90%.
8.33 kHz channel spacing For RF input signals between -53 dBm and +10 dBm, the total
harmonic distortion is less than 5% within the frequency range 350 Hz
to 2.5 kHz when the modulation depth is between 30 and 90%.
Wanted Signal Dynamic Range (RF AGC)
For a 90% modulated on-channel signal, a change in signal level from -107 dBm to +10 dBm produces
less than a 3 dB change in audio output. On-channel signals modulated at 90% up to a level of +17 dBm
achieve at least 10 dB SINAD.
The AGC attack time is less than 40 ms and the decay time is less than 50 ms for a 40 dB step input.
Audio AGC
AM-Voice The audio AGC compresses a 30% to 90% variation in input
modulation depth to an audio output power change of 1 dB or less.
The audio output level is maintained at the equivalent of 90%
modulation. Audio AGC can be disabled.
AM-MSK The audio AGC is permanently disabled.
Squelch
The receiver has a noise compensated carrier operated squelch. It has a carrier adjustment range of -114
to -60 dBm without the RF pre-attenuator selected (these levels are increased by the value of the RF pre-
attenuator when it is selected) and provides greater than 60 dB of quieting.
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Attack time is <20 ms for a signal rising 10 dB above the squelch setting
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Release time is <20 ms for a signal falling 10 dB below the squelch setting
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Hysteresis is 2 to 4 dB.
The squelch has a noise compensation disable facility to provide carrier only operation.
The squelch has a carrier override enable facility, which is preset at 10 dB (±2 dB) above the current
squelch setting.
The squelch can also be defeated.
The squelch is independent of the audio output control.
Receive Control
AM-Voice Audio Outputs
The transceiver’s outputs are the remote 600 ohm balanced audio line, the headset output and the
loudspeaker. Line level output is adjustable between -30 and +10 dBm.
AM-MSK Audio Output
AM-MSK data is connected to an external modem through the remote audio line output.