6-80
SECTION 6
OPTIONS
TX MODULATION LIMITING (Burst)
This result is the peak deviation reading (in kHz) of the Repeater transmitter
modulation with a burst of 1 kHz sine wave injected into the Repeater’s audio-in
path from the COM-120C Data Gen output baseband jack at a level which is 20 dB
higher than 60% of the Repeater’s Rated Output. The result in the right column is
the actual level in mVp which was used to make the deviation measurement.
TX AUDIO DISTORTION
This result is the Distortion measurement in % of the Repeater’s transmitter with a
1 kHz sine wave injected into the Repeater’s audio-in path from the COM-120C Data
Gen output baseband jack at the level of the Repeater’s Rated Output.
RX AUDIO SENSITIVITY
This result is the AF Level read back from the Repeater’s audio output path with a
1 kHz sine wave FM-generated at 3 kHz (1.5 kHz for narrow band) deviation,
-50.0 dBm level, from the COM-120C to the Repeater’s RF input (Repeater must
have receiver unsquelched). The AF Level voltage is then measured using
wideband (no) filtering from the Audio/Data/SINAD Input baseband jack. The result
is the AF Level voltage shown in Vrms and mV peak to peak.
RX SINAD @ 12 dB
This result is the SINAD reading from the Repeater’s audio output path with a
1 kHz sine wave FM-generated at 3 kHz (1.5 kHz for narrow band) deviation from
the COM-120C to the Repeater RF input (Repeater must have receiver
unsquelched). The COM-120C Generator RF Level starts at -105.0 dBm and
lowered until a SINAD reading of 12 dB is acquired. Then the RF Level is recorded
as the result of the test in dBm.
Results: Audio Test (Repeater Tx Audio Response)
TX AUDIO RESPONSE
This shows the results of the
measured deviation from the
Repeater’s transmitter with a
series of tone frequencies (sine
wave) injected into the Repeater’s
audio input path from the COM-
120C Data Gen output baseband
jack at 20% of the Repeater’s
Rated Output
.
The measurements do not include the Radio’s sub-audible data deviation. The
series of tone frequencies used are: 300 Hz, 800 Hz, 1300 Hz, 1800 Hz, 2300 Hz,
2800 Hz and 3000 Hz.
0061600
Tx Audio Response
Freq:
[Reptr]
.3 K .8 K 1.3 K 1.8 K 2.3 K 2.8 K 3.0 K
1.050.25 0.880.62 1.161.18 1.07 kHz
Dev:
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