Park Air Systems T6TR, User Documentation

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T6TR VHF 50 W Transceiver Page 13 Specification
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Channel Spacing
Mode 3 channel spacing is 25 kHz.
IF Selectivity
At ±11 kHz from the centre frequency, the signal is attenuated by less than 6 dB.
At ±25 kHz from the centre frequency the signal is rejected by more than 80 dB.
Unwanted Signal Suppression
With the required signal at -92 dBm, a BER of better than 1x10
-3
with Reed Solomon decoding switched
off is achieved under the following conditions:
‰
An interfering signal at -32 dBm on an adjacent channel
‰
One or more out-of-band interfering signals having a total level of -33 dBm
‰
One or more VHF FM broadcast signals having a total level of -5 dBm
‰
Co-channel rejection better than 20 dB.
Synchronisation
For received signals greater than -103 dBm, the probability of synchronisation is greater than 0.999. The
probability of false synchronisation is 3x10
-3
.
Receive Modulation Characteristics
Mode
Mode 3 uses Time Division Multiple Access (TDMA) differentially encoded 8-phase shift keying (D8PSK)
using a raised cosine filter with
α
= 0.6 (nominal value), emission designator 14K0G7WET.
Dynamic Range (RF AGC)
A BER better than 1x10
-3
with Reed Solomon decoding off is achieved for received signals of -102 dBm
to +10 dBm. The AGC attack time is less than 0.5 ms and the decay time is less than 1 ms for a 40 dB
step input.
Frequency Offsets
The transceiver operates with frequency offsets up to 826 Hz.